Note: Descriptions are shown in the official language in which they were submitted.
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TITLE OF THE INVENTION
ANTAGONISTS OF GONADOTROPIN RELEASING HORMONE
BACKGROUND OF THE INVENTION
The gonadotropin-releasing hormone (GnRH), also
referred to as luteinizing hormone-releasing hormone {LHRH), is a
decapeptide that plays a key role in human reproduction. The hormone
is released from the hypothalamus and acts on the pituitary gland to
stimulate the biosynthesis and secretion of luteinizing hormone (LH) and
follicle-stimulating hormone (FSH). LH released from the pituitary
gland is primarily responsible for the regulation of gonadal steroid
production in both sexes, whereas FSH regulates spermatogenesis in
males and follicular development in females. GnRH agonists and
antagonists have proven effective in the treatment of certain conditions
which require inhibition of LH/FSH release. In particular, GnRH-based
therapies have proven effective in the treatment of endometriosis,
uterine fibroids, polycystic ovarian disease, precocious puberty and
several gonadal steroid-dependent neoplasia, most notably cancers of the
prostate, breast and ovary. GnRH agonists and antagonists have also
been utilized in various assisted fertilization techniques and have been
investigated as a potential contraceptive in both men and women. They
have also shown possible utility in the treatment of pituitary
gonadotrophe adenomas, sleep disorders such as sleep apnea, irritable
bowel syndrome, premenstrual syndrome, benign prostatic hyperplasia,
hirsutism, as an adjunct to growth hormone therapy in growth hormone
deficient children, and in murine models of lupus. The compounds of
the invention may also be used in combination with bisphosphonates
(bisphosphonic acids) and other agents, such as growth hormone
secretagogues, e.g. MK-0677, for the treatment and the prevention of
disturbances of calcium, phosphate and bone metabolism, in particular,
for the prevention of bone loss during therapy with the GnRH
antagonist, and in combination with estrogens, progesterones,
antiestrogens, antiprogestins and/or androgens for the prevention or
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treatment of bone loss or hypogonadal symptoms such as hot flashes
during therapy with the GnRH antagonist.
Additionally, a compound of the present invention may be
co-administered with a 5a-reductase 2 inhibitor, such as finasteride or
epristeride; a 5a-reductase 1 inhibitor such as 4,7(3-dimethyl-4-aza-5a-
cholestan-3-one, 3-oxo-4-aza-4,7~3-dimethyl-163-(4-chlorophenoxy)-
5a-androstane, and 3-oxo-4-aza-4,7~3-dimethyl-163-(phenoxy)-5a-
androstane as disclosed in WO 93/23420 and WO 95/11254; dual
inhibitors of 5a-reductase 1 and 5a-reductase 2 such as 3-oxo-4-aza-
17[3-(2,5-trifluoromethylphenyl-carbamoyl)-5a-androstane as disclosed
in WO 95/07927; antiandrogens such as flutamide, casodex and
cyproterone acetate, and alpha-1 blockers such as prazosin, terazosin,
doxazosin, tamsulosin, and alfuzosin.
Further, a compound of the present invention may be used
in combination with growth hormone, growth hormone releasing
hormone or growth hormone secretagogues, to delay puberty in growth
hormone deficient children, which will allow them to continue to gain
height before fusion of the epiphyses and cessation of growth at
puberty.
Current GnRH antagonists are GnRH-like decapeptides
which are generally administered intravenously or subcutaneously
presumably because of negligible oral activity. These have amino acid
substitutions usually at positions one, two, three, six and ten.
Non-peptide GnRH antagonists offer the possible advantage
of oral adminstration. Non-peptide GnRH antagonists have been
described in European Application 0 219 292 and in De, B. et al., J.
Med. Chem., 32, 2036-2038 (1989), in WO 95/28405, WO 95/29900
and EP 0679642 all to Takeda Chemical Industries, Ltd.
Arylquinolone analogs have been described in the art and
include those described in the following patents, patent applications and
journal articles. JP-A-63-295561 discloses a class of 3-phenyl-2( 1 H)-
quinolone derivatives, substituted at the 4-position by an unsubstituted
straight or branched alkoxy group and at the 7-position by an
unsubstituted straight or branched alkoxy group. These compounds are
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alleged to exhibit a strong inhibitory action on bone resorption and a
stimulatory effect on ossification, and thus to be useful as therapeutic
agents for the prevention and treatment of osteoporosis.
J. Heterocycl. Chem., 1989, 26, 281 discloses a range of 3-
(2-methoxyphenyl)-2(1H)-quinolones possessing a halogen substituent in
the 6- or 7-position and an optional carboxylic acid substituent at the 4-
position. A family of 3-phenyl-2(1H)-duinolone derivatives, substituted
at the 4-position by an amino or benzylamino group and at the 7-
position by a methyl or methoxy group, is described in Monatsh.
Chem., 1982, 113, 751 and Vestn. Slov. Kem. Drus., 1986, 33, 271.
WO 93/10783 and WO 93/11115 disclose a class of 2-(1H)-
quinolone derivatives, substituted at the 3-position by an optionally
substituted aryl substituent and are selective non-competitive antagonists
of NMDA receptors and/or are antagonists of AMPA receptors, and are
therefore of utility in the treatment of conditions, such as
neurodegenerative disorders, convulsions or schizophrenia.
FR 2711992-Al discloses quinolone derivatives which are
allegedly useful as antagonists of platelet activating factor.
SUMMARY OF THE INVENTION
The present invention relates to compounds which are non-
peptide antagonists of GnRH which can be used to treat a variety of sex-
hormone related conditions in men and women, to methods for their
preparation, and to methods and pharmaceutical compositions
containing said compounds for use in mammals.
Because of their activity as antagonists of the hormone
GnRH, the compounds of the present invention are useful to treat a
variety of sex-hormone related conditions in both men and women.
These conditions include endometriosis, uterine fibroids, polycystic
ovarian disease, hirsutism, precocious puberty, gonadal steroid-
dependent neoplasias such as cancers of the prostate, breast and ovary,
gonadotrophe pituitary adenomas, sleep apnea, irritable bowel
syndrome, premenstrual syndrome and benign prostatic hypertophy.
They are also useful as an adjunct to treatment of growth hormone
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deficiency and short stature, and for the treatment of systemic lupus
erythematosis. Further, the compounds of the invention may be useful
in in vitro fertilization and as contraceptives. The compounds may also
be useful in combination with androgens, estrogens, progesterones,
antiestrogens and antiprogestogens for the treatment of endometriosis,
fibroids and in contraception. They may also be useful in combination
with testosterone or other androgens or antiprogestogens in men as a
contraceptive. The compounds may also be used in combination with an
angiotensin-converting enzyme inhibitor such as Enalapril or Captopril,
an angiotensin II-receptor antagonist such as Losartan or a renin
inhibitor for the treatment of uterine fibroids. Additionally, the
compounds of the invention may also be used in combination with
bisphosphonates (bisphosphonic acids) and other agents, for the
treatment and the prevention of disturbances of calcium, phosphate and
bone metabolism, in particular, for the prevention of bone loss during
therapy with the GnRH antagonist, and in combination with estrogens,
progesterones and/or androgens for the prevention or treatment of bone
loss or hypogonadal symptoms such as hot flashes during therapy with
the GnRH antagonist.
Additionally, a compound of the present invention may be
co-administered with a Sa-reductase 2 inhibitor, such as finasteride or
epristeride; a Sa-reductase 1 inhibitor such as 4,73-dimethyl-4-aza-5a-
cholestan-3-one, 3-oxo-4-aza-4,7~3-dimethyl-163-(4-chlorophenoxy)-
Sa-androstane, and 3-oxo-4-aza-4,7~3-dimethyl-163-(phenoxy)-Sa-
androstane as disclosed in WO 93/23420 and WO 95/11254; dual
inhibitors of Sa-reductase l and Sa-reductase 2 such as 3-oxo-4-aza-
17(3-(2,5-trifluoromethylphenyl-carbamoyl)-Sa-androstane as disclosed
in WO 95/07927; antiandrogens such as flutamide, casodex and
cyproterone acetate, and alpha-1 Mockers such as prazosin, terazosin,
doxazosin, tamsulosin, and alfuzosin.
Further, a compound of the present invention may be used
in combination with growth hormone, growth hormone releasing
hormone or growth hormone secretagogues, to delay puberty in growth
hormone deficient children, which will allow them to continue to gain
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height before fusion of the epiphyses and cessation of growth at
puberty.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to compounds of the general
formula
RIO~N-R11
i
R9 (B)
R 9a~
(A)
R~ X
R6 \ \
R~ ~ NCO
Ra R1 (I)
wherein:
A is a bond, C1-C~, alkyl, substituted C1-C~ alkyl, C2-C~ alkenyl,
substituted C2-C~, alkenyl, C2-C~ alkynyl, substituted C2-C
alkynyl, C I -C~ alkoxy, substituted C 1-C6 alkoxy;
B is a bond, C 1-C6 alkyl, substituted C 1-C6 alkyl;
X is O, S, SO, S02, NR 12, C(R 13R 14)~ or can be absent;
Y is
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Z ~ N Z~N N
~~ . .
R2 C/~~I Z R2 ~ ~ Ra~ ~ ''N
\ \
R s R R /c~ Z
R3 Ra a 3 Ra R2 R3 R2
O
Zy Ra Z~ ~ ~, R3 Z.
N i/ ~ ,N ~N N-R
~I~ R3 ~I \ R3 ~~ N ~IN ~-
R2 R2 R2 R2 R2 Ra
O
N N ~ N ~ ~N~N \ ''N ~N~N-Rig
~N R ~ ~N
N-N N= N
R2 R2 R~7 'R»
O R
~N _1 ~_N ~N~_~ N _~N j R2
~/w:WJ R2 ~/_ y R2 ~/w:~'J R2 ~,~ N J R N
Ra R3 RaN R3 Ra Rs Ra 3 R2
N
I N1R ' I ~NR2 '"' \ I N/NR2 ~/ I N R2
2 /. ~J ~/. ~J
L J
R/ ~R Ra R3 Ra Rs Ra R3
4 3
R
_~ N1 ~Z i~ s /~
L'/ I ~~ R2 R3 ~I N R2~
r~ \ N
Ra N Rs R2
Z is O, S, or NR12;
Rl is H, C1-C6 alkyl, substituted Cl-C~, alkyl, C3-C6 cycloalkyl,
substituted C3-C6 cycloalkyl, aryl, substituted aryl, C2-C~
aralkyl, substituted C I -C6 aralkyl;
R2, R3 and R4 are independently H, C 1-C6 alkyl, substituted C ~ -C6
alkyl, C2-C~ alkenyl, substituted C2-C~ alkenyl, C2-C6
alkynyl, substituted C2-C~ alkynyl, CN, vitro, Cl-C3
perfluoroalkyl, C1-C3 perfluoroalkoxy, aryl, substituted
aryl, C 1-C~ aralkyl, substituted C I -C~ aralkyl,
R150WR13R14)p-~ R16C~0)WCR13R14)p-~
R15~CW)~CR13R14)p-~ OCR13R14)pSW)nRl2>
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-(CR 13R 14)pC(O)NR 17R 18, -(CR 13R 14)pNR 17C(O)R 16,
-(CR 13R 14)pN(R 17R 18) or halogen;
R5, R6, R7 and R~, independently are H, halogen, C1-C~ alkyl,
substituted C l -C~ alkyl, C2_C~, alkenyl, substituted C2-C6
alkenyl, CZ-C~, alkynyl, substituted C2-C~ alkynyl, aryl,
substituted aryl, C 1-C~ aralkyl, substituted C 1-C~ aralkyl,
heteroaryl, C 1-C~, heteroaralkyl, substituted heteroaryl,
substituted C1-C6 heteroaralkyl, C1-C3 perfluoroalkyl,
C 1-C3 perfluoroalkoxy, R 150(CR 13R 14)p-, -(CR 13R 14)pCN,
-(CR13R14)pS0"R12~ -(CR13R14)pS02N(R17R1R)~
-(CR13R14)pN(R17R1~)~ -(CR13R14)pN(R17)C(O)R16~
-(CR 13R 14)pN(R 17)C(O)N(R 17R 18)~
-(CR 13R 14)pN(R ~ 7)S02N(R 17R 1 k)~
-(CR 13R 14)pN(R 17)S02R 12~ -(CR 13R 14)pC(O)OR 15
-(CR 13R 14)pOC(O)R 1 ~, -(CR 13R 14)pC(O)N(R 17R 1 H)
-(CR 13R 14)pOC(O)N(R 17R 18)~
-(CR13R14)pN(R17)C(~)OR15~ or
-(CRI~Ria)pN(Rm)C(NRoRm)
N-R ~ ~
R9 and Rya are independently H, C 1-C~ alkyl, substituted C 1-C~ alkyl
aryl, C1-C~ aralkyl, substituted aryl, substituted C1-C~
aralkyl; or
R lp is H, C 1-C6 alkyl, substituted C 1-C~ alkyl, aryl, C 1-C~, aralkyl,
substituted aryl, substituted C1-C~ aralkyl; or
R11 is H, C1-C~ alkyl, substituted C1-C~, alkyl,
-(CR13R14)pC(O)OR15~ or
R9 and R9a can be taken together to form a carbocyclic ring, saturated
or unsaturated, of 3-7 variously substituted carbon atoms,
or;
R9 and Rlp can be taken together to form a heterocyclic ring, saturated
or unsaturated, of 4-7 atoms containing 1-3 heteroatoms
selected from O, N, and S, or;
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(R9 and R 1 p) and (R9a and R 11 ) can be taken together to form a
heterobicyclic ring, with each ring being independently
saturated or unsaturated, of 4-7 atoms containing 1-3
heteroatoms selected from O, N, and S;
R 12 is H, C 1-C6 alkyl, substituted C 1-C~ alkyl, aryl, substituted
aryl, C 1-C~ aralkyl, substituted C ~ -C~, aralkyl;
R 13 and R 14 are independently H, C 1-C~ alkyl, substituted C 1-C~ alkyl,
aryl, substituted aryl, C 1-C6 aralkyl, substituted C ~ -C~
aralkyl;
R 15 is H, C ~ -C~ alkyl, substituted C ~ -C~ alkyl, aryl, substituted
aryl, C~-C~ aralkyl, substituted Cl-C6 aralkyl; heteroaryl,
substituted heteroaryl, Cl-C6 heteroaralkyl, substituted C1-
C~ heteroaralkyl, or a heterocyclic ring containing 1-4
heteroatoms selected from O, N, and S;
Rl6 is H, CI-C~, alkyl, substituted Ct-C~ alkyl, aryl, substituted
aryl, C 1-C~, aralkyl, substituted C 1-C6 aralkyl; heteroaryl,
substituted heteroaryl, C 1-C6 heteroaralkyl, substituted C 1-
C~ heteroaralkyl, or a heterocyclic ring containing 1-4
heteroatoms selected from O, N, and S;
R 1 ~ and R 1 g are independently H, C 1-C~ alkyl, substituted C 1-C~ alkyl,
C3-C~ cycloalkyl, substituted C3-C~, cycloalkyl, aryl,
substituted aryl, Cl-C~ aralkyl, substituted C1-Cfi aralkyl,
heteroaryl, substituted heteroaryl, C~-C~ heteroaralkyl,
substituted C 1-C~ heteroaralkyl; or taken together form a
carbocyclic rings) of 4-7 carbon atoms each or a
heterocyclic ring containing 1-4 heteroatoms selected from
O, N, and S;
R 19 is H, C 1-C~ alkyl, substituted C 1-C~ alkyl or -CN;
n is 0, 1, or 2;
p is 0, 1, 2, 3 or 4
the alkyl, cycloalkyl, alkenyl and alkynyl substituents are
selected from C 1-C f alkyl, C3-C~ cycloalkyl, aryl,
substituted aryl, aralkyl, substituted aralkyl, hydroxy, oxo,
cyano, C 1-C6 alkoxy, fluoro, C(O)OR 11, aryl C t -C3 alkoxy,
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substituted aryl Cl-C3 alkoxy, and the aryl substituents are
as defined for R3, R4 and R5;
~- or a pharmaceutically acceptable addition salt and/or hydrate thereof, or
where applicable, a geometric or optical isomer or racemic mixture
thereof.
Unless otherwise stated or indicated, the following
definitions shall apply throughout the specification and claims.
When any variable (e.g., aryl, heterocycle, R1, etc.) occurs
more than one time in any constituent or in formula I, its definition on
each occurrence is independent of its definition at every other
occurrence. Also, combinations of substituents and/or variables are
permissible only if such combinations result in stable compounds.
The term "alkyl" is intended to include both branched- and
straight-chain saturated aliphatic hydrocarbon groups having the
specified number of carbon atoms, e.g., methyl (Me), ethyl (Et),
propyl, butyl, pentyl, hexyl, heptyl, octyl, nonanyl, decyl, undecyl,
dodecyl, and the isomers thereof such as isopropyl (i-Pr), isobutyl (i-
Bu), sec-butyl (s-Bu), tert-butyl (t-Bu), isopentane, isohexane, etc.
The term "aryl" includes phenyl and naphthyl. Preferably,
aryl is phenyl.
The term "halogen" or "halo" is intended to include
fluorine, chlorine, bromine and iodine.
The term "heterocycle" or "heterocyclic ring" is defined by
all non-aromatic, heterocyclic rings of 3-7 atoms containing 1-3
heteroatoms selected from N, O, and S, such as oxirane, oxetane,
tetrahydrofuran, tetrahydropyran, pyrrolidine, piperidine,
tetrahydropyridine, tetrahydropyrimidine, tetrahydrothiophene,
tetrahydrothiopyran, morpholine, hydantoin, valerolactam,
pyrrolidinone, and the like.
The term "heteroaryl" is intended to include the compounds
shown below:
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N Z~N N
' I ~~ ~ f ~ ~ ~~N
i R2 ~/~~ ' R2 ~ ~~ J Ra I
Z /~.~ ~ ~ ~~ Z
v
R3 ~ Ra Rs Ra R3 Ra R2 R3 R2
O
Zy Ra ~ ~ ~i R3 Z.
~ ~N ~,.,.;'r il ~ , N ~ N N- R i ~
LI, R3 ~IJ R3 ''N '~N
R2 R2 R2 R2 Rz Ra
O
N N ~ N ~ N'N ~~~N ~N~N-R»
IJ ~~, N ~ R ~_ -N
N 2 N N N N= N
R2 R1~ 'Rig
O
N', N ,..~, / Ri ~
~N 1 ~_N ~ NR ~ % R2 f~I ~ N
~/~WJR2 ~/_ y R2 l/~:~~J 2 R/N JR3 N
Ra R3 Ra N R3 Ra Rs a R2
N
/ N l ~! I ~ NR / N~ N ,,.,~ I i R2
-R ~ ~J 2 ~ I ~~ R2 L~i~~.N
z / v L/. ~J
L J
v R Ra R3
4 R3 Ra R3
Ra Rs
R
/ N~ IZ /~ s~/~
R2 Ra LI N R2 'N
Ra N Rs R2
where Z is: O, S, or NR12
In addition, it is well known to those skilled in the art that
many of the foregoing heterocyclic groups can exist in more than one
tautomeric form. It is intended that all such tautomers be included
within the ambit of this invention.
The optical isomeric forms, that is mixtures of
enantiomers, e.g., racemates, or diastereomers as well as individual
enantiomers or diastereomers of the instant compound are included.
These individual enantiomers are commonly designated according to the
optical rotation they effect by the symbols (+) and (-), (L) and (D), ( 1 )
and (d) or combinations thereof. These isomers may also be designated
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according to their absolute spatial configuration by (S) and (R), which
stands for sinister and rectus, respectively.
The individual optical isomers may be prepared using
conventional resolution procedures, e.g., treatment with an appropriate
optically active acid, separating the diastereomers and then recovering
the desired isomer. In addition, the individual optical isomers may be
prepared by asymmetric synthesis.
Additionally, a given chemical formula or name shall
encompass pharmaceutically acceptable addition salts thereof and
solvates thereof, such as hydrates.
The compounds of the present invention, while effective
themselves, may be formulated and administered in the form of their
pharmaceutically acceptable addition salts for purposes of stability,
convenience of crystallization, increased solubility and other desirable
properties.
The compounds of the present invention may be
administered in the form of pharmaceutically acceptable salts. The term
"pharmaceutically acceptable salt" is intended to include all acceptable
salts. Examples of acid salts are hydrochloric, nitric, sulfuric,
phosphoric, formic, acetic, trifluoroacetic, propionic, malefic, succinic,
malonic, methane sulfonic and the like which can be used as a dosage
form for modifying the solubility or hydrolysis characteristics or can be
used in sustained release or prodrug formulations. Depending on the
particular functionality of the compound of the present invention,
pharmaceutically acceptable salts of the compounds of this invention
include those formed from cations such as sodium, potassium,
aluminum, calcium, lithium, magnesium, zinc, and from bases such as
ammonia, ethylenediamine, N-methyl-glutamine, lysine, arginine,
ornithine, choline, N,N'-dibenzylethylenediamine, chloroprocaine,
diethanolamine, procaine, N-benzylphenethylamine, diethylamine,
piperazine, tris(hydroxymethyl)aminomethane, and
tetramethylammonium hydroxide. These salts may be prepared by
standard procedures, e.g. by reacting a free acid with a suitable organic
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or inorganic base, or alternatively by reacting a free base with a suitable
organic or inorganic acid.
Also, in the case of an acid (-COOH) or alcohol group
'° being present, pharmaceutically acceptable esters can be employed,
e.g.
methyl, ethyl, butyl, acetate, maleate, pivaloyloxymethyl, and the like,
and those esters known in the art for modifying solubility or hydrolysis
characteristics for use as sustained release or prodrug formulations.
The compounds of the present invention may have chiral
centers other than those centers whose stereochemistry is depicted in
formula I, and therefore may occur as racemates, racemic mixtures
and as individual enantiomers or diastereomers, with all such
isomeric forms being included in the present invention as well as
mixtures thereof. Furthermore, some of the crystalline forms for
compounds of the present invention may exist as polymorphs and as
such are intended to be included in the present invention. In
addition, some of the compounds of the instant invention may form
solvates with water or common organic solvents. Such solvates are
encompassed within the scope of this invention.
As used herein, the term "composition" is intended to
encompass a product comprising the specified ingredients in the
specified amounts, as well as any product which results, directly or
indirectly, from combination of the specified ingredients in the specified
amounts.
The compounds of the invention are prepared by the
following reaction schemes. All substituents are as defined above unless
indicated otherwise.
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Scheme A
R5 O 2 R5
R6 \ COOMe Y~C~ R6 \ COOMe
O
R7 I ~ NH -or- R I / N~Y
R$ R~ O 3 R$ R1 Q
Y v _OH
NaHMDS
EDC, DMAP
R5 OH
R6 \ \ Y
R7 ~ N" O
Rs R1 5
Reaction Scheme A
As shown in reaction Scheme A, treatment of amino ester
(1) with a heteroaryl acetyl chloride (2) in an inert organic solvent such
as dichloroethane, chloroform, methylene chloride or the like at a
temperature of 25-80° C for a period of 30 minutes to 4 hours gives the
corresponding amide (4). Alternatively, treatment of amine ( 1 ) and a
heteroarylacetic acid (3) with the coupling reagent 1-(3-
dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), 1,3-
dicyclohexylcarbodiimide (DCC) or the like with or without 1-
hydroxybenzotriazole (HOBt} and a tertiary amine base such as N-
methylmorpholine (NMM), triethylamine or the like in an inert organic
solvent such as methylene chloride, chloroform, N,N-
dimethylformamide, or mixtures thereof at or near room temperature
for a period of 3-24 hours to provides the corresponding amide
derivative (4). Cyclization of amide (4) is effected by treatment with a
strong base such as sodium bis(trimethylsilyl)amide, lithium
bis(trimethylsilyl)amide or the like in an inert organic solvent such as
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tetrahydrofuran at a temperature of -20°-25° C for a period of 2-
4
hours to give quinolone (5).
Scheme B
R~o~NRl1
R (B) _ _ R~o~N'R~~
sa Or '
(A) 6 Rs~(B)
Rsa
(A) 8
1. K2C03, Nal OH
R5 OH X= CI, Br, I, OMs,
R6 \ \ Y OTf, etc. PPh3, DEAD
R~ ~ N"O
2. deprotection
R8 R~ (if necessary)
Rij
Rio ~N.
Rs (B)
Rsa
(A)
RS O
R6 \ \
R7 ~ N"O
R$ R~
7
Reaction Scheme B
As shown in reaction Scheme B, treatment of the 4-
hydroxyquinolone (5) with an alkylamine containing a halogen or
sulfonate leaving group (6) and a suitable base such as potassium
carbonate, sodium carbonate, sodium bicarbonate, DBU or the like
along with the catalyst sodium iodide in an inert organic solvent such as
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N,N-dimethylformamide, tetrahydrofuran, acetonitrile or the like at or
around ~0° C for a period of 4-24 hours provides the ether derivative
(7). As an alternative, a suitably protected amino alcohol (8) may be
coupled to (_5) by treatment under Mitsunobu reaction conditions with
triphenylphosphine and an activating agent such as diethyl
azodicarboxylate, disopropyl azodicarboxylate or the like in an inert
solvent such as tetrahydrofuran, toluene, chlorobenzene or the like at
ambient temperature for a period of 4-64 hours to give (7).
After coupling, the amino group can be deprotected by any
method suitable to the protecting group used and compatible with the
functionality present in (7). For example, a t-butyl carbamate group
can be removed by treatment with a protic acid such as trifluoroacetic
acid, with or without added anisole, in an inert organic solvent such as
methylene chloride at ambient temperature for a period of 30 minutes
to 4 hours to provide the corresponding amine.
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Scheme C
R~ OH R5 OTf
Y Tf20, DBU R6 I ~ ~ Y
R7 ~ NCO R7 ~ NCO
R8 R~ R8 R1
9
R~~
R11 Rio ~N
R~o~N Rs (B)
R9 (B) R9a
Rsa (A)
(p,) 1. EtN(iPr)2 SH
R5 g 10
R6 ~ ~ Y 2. deprotection
(if necessary)
R ~ N" O
R$ Ri
11
Reaction Scheme C
As shown in reaction Scheme C, the 4-hydroxyquinolone
structure (5) may be modified by conversion to a sulfonate leaving
group such as the trifluoromethanesulfonate (9) upon treatment with
trifluoromethane-sulfonic anhydride in an inert organic solvent such as
methylene chloride and an amine base such as diazabicycloundecene,
2,6-lutidine, pyridine or the like at or below room temperature for a
period of 30 minutes to 2 hours. Reaction of (9) with an appropriate
thiol (10} and an amine base such as diisopropylethylamine,
triethylamine or the like in an inert organic solvent such as N,N-
dimethylformamide at or below room temperature for a period of 4-24
hours gives the thioether analog ( 11 ).
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Scheme D
Rio ~N~Ro R ION..--Ro
Rs (B) Rs (B)
R9a Rsa
(A) (A)
R5 X hydrazine, C R X
O2N Y FeCl3 (cat.) H N 5 Y
-, 2 W W
or
R7 ~ N O SnCl2 R7 N O
R8 R1 R8 R~
12 13
Reaction Scheme D
As shown in reaction Scheme D, nitro groups appended to
these structures, such as in ( 12), can be reduced to the corresponding
amines (13) by treatment with hydrazine and a reduction catalyst such as
iron (III) chloride and carbon in an inert organic solvent such as
methanol, ethanol or the like at a temperature of 65°-100° C for
a
period of 5-20 hours. Alternatively, treatment of ( 12) with
tin(II)chloride dehydrate in a polar solvent such as ethanol or methanol
at a temperature of 70°-80° C for a period of 30 minutes to 4
hours
gives the reduced, amino derivative (13).
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Scheme E
R~~
Rio'N
R (g) 1. triphosgene, pyridine
9 NH(Rl7,Ria)
R9a
(p,) 2. deprotection
(if necessary)
R" R5 X R
HN ~ ~ Y Rio'N ii
R~ ~ / N~O R9 (B)
i R 9a
Rs R~
13 R» R» R5 X
~N~ I W W Y
Ria O ~
R ~ N" O
Rs R1
14
Reaction Scheme E
As shown in reaction Scheme E, amines such as (13) can be
converted to the corresponding urea derivatives (14) by treatment with
an appropriate acylating agent such as phosgene, triphosgene,
carbonyldiimidazole or the like, with or without an amine base such as
pyridine in an inert organic solvent such as methylene chloride,
chloroform, dichloroethane or the like together with the desired
primary or secondary amine at 0°-25°C for a period of 1-48
hours.
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Scheme F
Ri1
R~o~N
16 O
R9 (B) or R~ 2S02X
R9a 1. R~s~X
17
(A) X = CI, etc.
R5 X
R»HN \ \ Y 2. deprotection
(if necessary)
R~ ~ N" O
R8 R~
Rto 'N Rv Rio ~N'R~~
Rs (B) Rs (B)
R 9a Or R9a
(A) (A)
R1~ R5 X R » R5 X
R~O~~S;O ~ \ \ Y R~s~N I \ \ Y
R~ ~ NCO O R~ ~ N~O
R$ Ri R$ R~
19 18
Reaction Scheme F
As shown in reaction Scheme F, amines such as (1S) can be
converted to the corresponding amide ( 18) or sulfonamide derivatives
( I 9) by treatment with an appropriate acylating agent such as an acetyl
chloride, acid anhydride, sulfonylchloride, sulfonic anhydride or the
like, with or without an amine base such as pyridine, in an inert organic
solvent such as methylene chloride, chloroform, dichloroethane,
benzene, toluene, chlorobenzene or the like at 0-100°C for a period of
I -10 hours.
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Scheme G
R»
R~° ~N 1. R R NH
~s
R9 (B) 21
Rsa (Ph3P)2PdCl2 (Cat.) CO~g~
R (X) R4\~j s triethylamine, DMAP
1 R
I ~ ~ ~ 2 2. deprotection
(if necessary)
R7 ~ N" O
R8 R~
R».
Rio ~N.
Rs (B)
R9a
A
O R5 (X) R4W/13
R»~N ~ ~ ~ -R2
i
R'$ R7 ~ N"O
R8 R1
22
Reaction Scheme G
As shown in Scheme G, iodides such as (20) can be
converted to the corresponding amide (22) by treatment with an
appropriate amine (21 ) and a palladium catalyst such as
dichiorobis(triphenylphosphine)palladium(II) in the presence of an
amine base such as triethylamine in an inert organic solvent such as
N,N-dimethylformamide, or the like, under an atmosphere of carbon
monoxide at 90 °C for a period of 5-2_5 hours.
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Scheme H
R»
Rio ~N,
R9 (B)
R9a
A
R5 (X) R4/w/~ 3
-R2
I I \ \ \
R7 ~ NCO
1. R6Sn(Bu)3 R8 R~ 1. R6Sn(Bu)3
23 2p 23
(Ph3P}2PdCl2 (cat.) CO~g~ (Ph3P}2PdCl2 (cat.)
triethylamine LiCI
2. deprotection 2. deprotection
(if necessary) (if necessary)
R1~ R1~
Rio ~N Rio ~N'
Rs (B) Rs (B)
R9a R9a
O R5 (X) R4W/13 R5 (X) R4~~/1 s
Rs \ \ \ R2 Rs \ \ \ -R z
R7 I ~ N"O R7 1 ~ N' \-O
R$ R~ Rg R1
24 25
Reaction Scheme H
As shown in Reaction Scheme H, iodide (20) can be coupled
with alkyl-, vinyl-, aryl- and heteroaryl-stannanes (23) using an
appropriate palladium catalyst such as dichlorobis(triphenylphosphine)
palladium(II) in an inert organic solvent such as N,N-dimethyl
formamide, toluene, or the like, at a temperature of 80-110 °C with or
without the presence of carbon monoxide to provide ketones (24) and
carbon-linked derivatives (25), respectively.
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Scheme I
R~1
RIO~N.
Rs (B)
Rsa
A
( X R~~~_~ 3 i. BH3
\ \ \ \ R2 ii. HOOH
R7 ~ N' \_O
R$ R1
26
R~o~N Ro R~o~N R1~
1. NMO '
Rs (B) TPAP (cat.) Rs (B)
Rsa 2. KMn04 Rsa
OH R5 (X) R~~/13 O R5 (X) R~~/Rs
\ \ \ R2 HO \ \ \ R2
R~ ~ ~ N' _ O R I ~ NI 'O
i ~ i
R8 R1 R8 R i
27 2g
Reaction Scheme I
As shown in Scheme I, the allyl derivative (26) can be
converted to primary alcohol (27) by treatment with borane or a
suitable alkylborane reagent in an inert solvent such as tetrahydrofuran
followed by exposure to a mild oxidant such as hydrogen peroxide.
Alcohols such as (27) can be further oxidized by treatment with
tetrapropylammonium perruthenate(VII) and 4-methylmorpholine-N-
oxide or similarly mild oxidants in an organic solvent such as methylene
chloride at room temperature for a period of 1 to 5 hours to give the
corresponding aldehyde. Further oxidation to the carboxylic acid can
be conducted with a strong oxidant such as potassium permanganate to
give acids such as (28).
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Scheme J
Rii
RIO~N,
Rs (B)
Rsa
(A) R R3
S x
\ ~ ~ \ R2 Os04
R7 ~ N"O
R8 Ri
26
R11 R11
RIO~N. RIO~N,
Rs (B) 1. Pb(OAc)4 Rs (B)
Rsa 2. KMr104 Rsa
OH R5 (X) R4~/13 R5 (X) R~~/13
\ \ ~ R2 HO ~ ~ \
I
OH I / N~O O ~ / N~O
R7 i R7 1 c
R$ Ri R8 R 1
29 R i i 30
04 Rio~N'
Rs (B)
Rsa
(A) R
O R5 >( R4~~~ a
\ -R2
HO
R~ ~ ~N' ~O
R$ R1
31
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Reaction Scheme J
As shown in Scheme J, the allyl derivative (26) can be
converted to the diol (29) by treatment with osmium tetraoxide with or
'~ without a co-oxidant such as 4-methylmorpholine-N-oxide in an inert
solvent such as tetrahydrofuran, tent-butanol, water or mixtures thereof
at room temperature for a period of 15 minutes to 5 hours. Diols such
as (29) can be further oxidized by treatment with lead (IV} acetate in an
inert solvent such as methanol pyridine or mixtures thereof at room
temperature for a period of 10 minutes to 2 hours to give the
corresponding aldehyde derivative. Further oxidation to the carboxylic
acid can be conducted with a strong oxidant such as potassium
permanganate to give acids such as (30).
Alternatively, treatment of diol (29) with a strong oxidant
such as potassium permanganate, ruthenium tetraoxide or the like can
give the benzoic acid product (31 } directly.
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Scheme K
R 10 ~N.R > >
R9 (B)
Rsa RI~R~sNH
R (X) R~ ~ 3 33
O 5 ~l
~--(CR~3R14)p ~ ~ ~ -R2 EDC, HOBt
HO
/ N" O
R~
Rs R~
32 Rio~N-R~~
R9 (B)
R9a
O Rs (X) R~~/_~ s
--(CRl3Ria)p ~ ~ W
R~WN.R~s I / N~O
R7
Rs R~
Reaction Scheme K
34
As shown in Scheme K, treatment of carboxylic acid (32)
and an appropriate amine such as (33) with the coupling reagent 1-(3-
dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), 1,3-
dicyclohexylcarbodiimide (DCC} or the like with or without
1-hydroxybenzotriazole (HOBt) and a tertiary amine base such as
N-methylmorpholine (NMM), triethylamine or the like in an inert
organic solvent such as methylene chloride, chloroform,
dimethylformamide, or mixtures thereof at or near room temperature
for a period of 3-24 hours provides the corresponding amide derivative
(34).
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Scheme L
H
RIO~N
Rs
Rsa R> >=O
R R 3 36
R~ x
-R2 NaCNBH3
Rs ~ \ \ \
R7 ~ NCO
R8 R1
Ri 1
RIO~N.
35 ,
Rs (B)
Rsa
A
R5 ~X) R~~/ls
\ -R
R ~ \ \ 2
R7 ~ Nfi0
Rg R~
37
Reaction Scheme L
As shown in Scheme L, amines such as (35) can undergo
reductive amination with carbonyl -containing compounds like (36) by
treating the pair with a dessicant such as molecular seives or magnesium
sulfate and an acid catalyst such as acetic acid in an inert organic solvent
such as methanol, chloroform or the like followed by a reducing agent
such as sodium cyanoborohydride, sodium borohydride, or hydrogen
and an appropriate metal catalyst to give derivative (37).
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The compounds of the present invention are useful in the
treatment of various sex-hormone related conditions in men and
women. This utility is manifested in their ability to act as antagonists of
the neuropeptide hormone GnRH as demonstrated by activity in the
following in vitro assays.
Human GnRH receptor binding assay
Crude membranes prepared from CHO cells expressing human GnRH
receptors were the sources for GnRH receptor. [i2sl]Buserelin (a
peptidyl GnRH analog) was used as the radiolabelled ligand. The
binding activity was determined as an ICS which is the antagonist
concentration required to inhibit the specific binding of [l2sl]buserelin
to GnRH receptors by 50%.
Rat pituitary GnRH receptor binding assay
Crude plasma membranes prepared from rat pituitary tissues were
incubated in a Tris.HCl buffer (50 mM, PH. 7.5) containing bovine
serum albumin (.1 %), [I-125]D-t-Bu-Serb-Pro9-ethyl amide-GnRH, and
the desired concentration of a test compound. The assay mixtures were
incubated at 4°C for 90-120 minutes followed by rapid filtration and
repeated washings through a glass fiber filter. The radioactivity of
membrane bound radioligands was determined in a gamma-counter.
From this data, the ICSp of the radioligand binding to GnRH receptors
in the presence of test compound was estimated.
Inhibition of LH release assay:
Active compounds from the GnRH receptor binding assay were further
evaluated with an in vitro LH release assay to confirm their antagonist
activity (blocking GnRH-induced LH release).
1. Sample Preparation
The compounds to be assayed were dissolved and diluted in DMSO.
The final concentration of DMSO in the incubation medium was 0.5%.
2. Assay
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The Wistar male rats (150-200 grams) were obtained from Charles
River Laboratories (Wilmington, MA). Rats were maintained at a
constant temperature (25°C) on a 12-hr light, 12-hr dark cycle. Rat
chow and water were available ad libitum. The animals were sacrificed
by decapitation and pituitary glands were aseptically removed and
placed in Hank's Balanced Salt Solution (HBSS) in a 50-mL
polypropylene centrifuge tube. The collection tube was centrifuged for
min at 250 x g, and HBSS was removed by aspiration. Pituitary
glands were transferred to a disposable petri plate and minced with a
scalpel. The minced tissue was then transferred to a 50-mL disposable
centrifuge tube by suspending the tissue fragments in three successive
10-mL aliquots of HBSS containing 0.2% collagenase and 0.2%
hyaluronidase. The cell dispersion was carried out in a water bath at
37°C with gentle stirring for 30 min. At the end of the incubation, the
cells were aspirated 20 to 30 times with a pipet and the undigested
pituitary fragments were allowed to settle for 3 to 5 min. The
suspended cells were removed by aspiration, and then subjected to a
1200 x g centrifugation for 5 min. The cells were then resuspended 11
Culture medium. The undigested pituitary fragments were treated with
30 mL aliquots of the digestion enzymes as above for a total of 3
digestions with the collagenase/hyaluronidase mixture. The resulting
cell suspensions were pooled, counted and diluted to a concentration of
3 x 105 cells/ml, and 1.0 ml of this suspension was placed in each well
of a 24-well tray (Costar, Cambridge, MA). Cells were maintained in a
humidified 5% C02-95% air atmosphere at 37°C for 3 to 4 days. The
culture medium consisted of DMEM containing 0.37% NaHC03, 10%
horse serum, 2.5% fetal bovine serum, 1% non-essential amino acids,
1 % glutamine, and 0.1 % gentamycin. On the day of an experiment,
cells were washed three times I 1/2 hrs prior to and two more times
immediately before the start of the experiment with DMEM containing
0.37% NaHC03, 10% horse serum, 2.5% fetal bovine serum, 1% non-
essential amino acids( 100X), 1 % glutamine( 100X), 1 %
Penicillin/Streptomycin(10,000 Units of Penicillin and 10,000
micrograms of Streptomycin per ml), and 25 mM HEPES, pH 7.4. LH
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release was initiated by adding 1 ml of fresh medium containing test
compounds in the presence of 2 nM GnRH to each well in duplicate.
Incubation was carried out at 37°C for 3 hr. After incubation,
medium
was removed and centrifuged at 2,000 x g for 15 min to remove any
cellular material. The supernatant fluid was removed and assayed for
LH content with a double antibody RIA procedure using materials
obtained from Dr. A. F. Parlow (Harbor-UCLA Medical Center,
Torrance, CA).
The compounds of formula I are useful in a number of
areas affected by GnRH. They may be useful in sex-hormone related
conditions, sex-hormone dependent cancers, benign prostatic
hypertrophy or myoma of the uterus. Sex-hormone dependent cancers
which may benefit from the administration of the compounds of this
invention include prostatic cancer, uterine cancer, breast cancer and
pituitary gonadotrophe adenomas. Other sex-hormone dependent
conditions which may benefit from the administration of the compounds
of this invention include endometriosis, polycystic ovarian disease,
uterine fibroids and precocious puberty. The compounds may also be
used in combination with an angiotensin-converting enzyme inhibitor
such as Enalapril or Captopril, an angiotensin II-receptor antagonist
such as Losartan or a renin inhibitor for the treatment of uterine
fibroids.
The compounds of the invention may also be useful for
controlling pregnancy, as a contraceptive in both men and women, for
in vitro fertilization, in the treatment of premenstrual syndrome, in the
treatment of lupus erythematosis, in the treatment of hirsutism, in the
treatment of irritable bowel syndrome and for the treatment of sleep
disorders such as sleep apnea.
A further use of the compounds of this invention is as an
adjunct to growth hormone therapy in growth hormone deficient
children. The compounds may be administered with growth hormone
or a compound which increases the endogenous production or release of
growth hormone. Certain compounds have been developed which
stimulate the release of endogenous growth hormone. Peptides which
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are known to stimulate the release of endogenous growth hormone
include growth hormone releasing hormone, the growth hormone
releasing peptides GHRP-6 and GHRP-1 (described in U.S. Patent No.
'° 4,411,890, PCT Patent Pub. No. WO 89/07110, and PCT Patent Pub.
No. WO 89/07111 ) and GHRP-2 (described in PCT Patent Pub. No.
WO 93/04081), as well as hexarelin (J. Endocrinol Invest., 15(Suppl 4),
45 ( 1992)). Other compounds which stimulate the release of
endogenous growth hormone are disclosed, for example, in the
following: U.S. Patent No. 3,239,345; U.S. Patent No. 4,036,979; U.S.
Patent No. 4,411,890; U.S. Patent No. 5,206,235; U.S. Patent No.
5,283,241; U.S. Patent No. 5,284,841; U.S. Patent No. 5,310,737; U.S.
Patent No. 5,317,017; U.S. Patent No. 5,374,721; U.S. Patent No.
5,430,144; U.S. Patent No. 5,434,261; U.S. Patent No. 5,438,136; EPO
Patent Pub. No. 0,144,230; EPO Patent Pub. No. 0;513,974; PCT Patent
Pub. No. WO 94/07486; PCT Patent Pub. No. WO 94/08583; PCT
Patent Pub. No. WO 94/11012; PCT Patent Pub. No. WO 94/13696;
PCT Patent Pub. No. WO 94/19367; PCT Patent Pub. No. WO
95/03289; PCT Patent Pub. No. WO 95/03290; PCT Patent Pub. No.
WO 95/09633; PCT Patent Pub. No. WO 95/11029; PCT Patent Pub.
No. WO 95/12598; PCT Patent Pub. No. WO 95/13069; PCT Patent
Pub. No. WO 95/14666; PCT Patent Pub. No. WO 95/16675; PCT
Patent Pub. No. WO 95/16692; PCT Patent Pub. No. WO 95/17422;
PCT Patent Pub. No. WO 95/17423; Science, 260, 1640-1643 (June 1 l,
1993); Ann. Rep. Med. Chem., 28, 177-186 (1993); Bioorg-Med.
Chem. Ltrs., 4(22}, 2709-2714 (1994); and Proc. Natl. Acad. Sci. USA
92, 7001-7005 (July 1995).
Representative preferred growth hormone secretagoues
employed in the present combination include the following:
1) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl}carbonyl]-2-( 1 H-indol-3-yl)ethyl]-2-amino-2-methyl-
propanamide;
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2) N-[ 1 (R)-[(1,2-Dihydro-I -methanecarbonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-( 1 H-indol-3-yl)ethyl]-2-amino-2-methyl-
propanamide;
3) N-[1(R)-[(1,2-Dihydro-1-benzenesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-(1H-indol-3-yl)ethyl]-2-amino-2-methyl-
propanamide;
4} N-[1(R)-[(3,4-Dihydro-spiro[2H-1-benzopyran-2,4'-piperidin]-1'-yl)
carbonyl]-2-(1 H-indol-3-yl)ethyl]-2-amino-2-methylpropanamide;
5) N-[ 1 (R)-[(2-Acetyl-1,2,3,4-tetrahydrospiro[isoquinolin-4,4'-
piperidin]-1'-yl)carbonyl]-2-(indol-3-yl)ethyl]-2-amino-2-methyl-
propanamide;
6) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-(phenylmethyloxy)ethyl]-2-amino-2-
methylpropanamide;
7) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-(phenylmethyloxy)ethyl]-2-amino-2-
methylpropanamide methanesulfonate;
8) N-[ 1 (R)-[( 1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-(2',6'-difluorophenylmethyloxy)ethyl] -2-
amino-2-methylpropanamide;
9) N-[1(R)-[(1,2-Dihydro-1-methanesulfonyl-5-fluorospiro[3H-indole-
3,4'-piperidin]-1'-yl)carbonyl]-2-(phenylmethyloxy)ethyl]-2-amino-2-
methylpropanamide;
10) N-[1(S)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl) carbonyl]-2-(phenylmethylthio)ethyl]-2-amino-2-
methylpropanamide;
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11) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-3-phenylpropyl]-2-amino-2-methyl-
propanamide;
12) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-3-cyclohexylpropyl]-2-amino-2-methyl-
propanamide;
13) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-4-phenylbutyl]-2-amino-2-methyl-
propanamide;
14) N-[1(R)-[(1,2-Dihydro-1-methanesulfonylspiro[3H-indole-3,4'-
piperidin]-1'-yl)carbonyl]-2-(5-fluoro-1 H-indol-3-yl)ethyl]-2-amino-2-
methylpropanamide;
15) N-[ 1 (R)-[( 1,2-Dihydro-1-methanesulfonyl-S-fluorospiro[3H-indole-
3,4'-piperidin]-1'-yI)carbonyl]-2-(5-fluoro-1 H-indol-3-yl)ethyl]-2-
amino-2-methylpropanamide;
16) N-[1(R)-[(1,2-Dihydro-1-(2-ethoxycarbonyl)methylsulfonylspiro-
[3H-indole-3,4'-piperidin]-1'-yl)carbonyl]-2-(1H-indol-3-yl)ethyl]-2-
amino-2-methylpropanamide;
17) N-[1(R)-[(1,2-Dihydro-l,l-dioxospiro[3H-benzothiophene-3,4'-
piperidin]-1'-yl)carbonyl]-2-(phenylmethyloxy)ethyl]-2-amino-2-
methylpropanamide;
and pharmaceutically acceptable salts thereof.
The compounds of the invention may also be used in
combination with bisphosphonates (bisphosphonic acids) and other
agents, such as growth hormone secretagogues, e.g. MK-0677, for the
treatment and the prevention of disturbances of calcium, phosphate and
bone metabolism, in particular, for the prevention of bone Loss during
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therapy with the GnRH antagonist, and in combination with estrogens,
progesterones and or androgens for the prevention or treatment of bone
loss or hypogonadal symptoms such as hot flashes during therapy with
the GnRH antagonist.
Bisphosphonates (bisphosphonic acids) are known to inhibit
bone resorption and are useful far the treatment of bone lithiasis as
disclosed in U.S. Patent 4,621,077 to Rosini, et al.
The literature discloses a variety of bisphosphonic acids
which are useful in the treatment and prevention of diseases involving
bone resorption. Representative examples may be found in the
following: U.S. Patent No. 3,251,907; U.S. Patent No. 3,422,137; U.S.
Patent No. 3,584,125; U.S. Patent No. 3,940,436; U.S. Patent No.
3,944,599; U.S. Patent No. 3,962,432; U.S. Patent No. 4,054,598; U.S.
Patent No. 4,267,108; U.S. Patent No. 4,327,039; U.S. Patent No.
4,407,761; U.S. Patent No. 4,578,376; U.S. Patent No. 4,621,077; U.S.
Patent No. 4,624,947; U.S. Patent No. 4,746,654; U.S. Patent No.
4,761,406; U.S. Patent No. 4,922,007; U.S. Patent No. 4,942,157; U.S.
Patent No. 5,227,506; U.S. Patent No. 5,270,365; EPO Patent Pub. No.
0,252,504; and J.- Ors. Chem., 36, 3843 (1971).
The preparation of bisphosphonic acids and halo-bisphosphonic
acids is well known in the art. Representative examples may be found
in the above mentioned references which disclose the compounds as
being useful for the treatment of disturbances of calcium or phosphate
metabolism, in particular, as inhibitors of bone resorption.
Preferred bisphosphonates are selected from the group of
the following compounds: alendronic acid, etidrononic acid, clodronic
acid, pamidronic acid, tiludronic acid, risedronic acid,
6-amino-1-hydroxy-hexylidene-bisphosphonic acid, and 1-hydroxy-
3(methylpentylamino)-propylidene-bisphosphonic acid;
or any pharmaceutically acceptable salt thereof. A particularly
preferred bisphosphonate is alendronic acid (alendronate), or a
pharmaceutically acceptable salt thereof. An especially preferred
bisphosphonate is alendronate sodium, including alendronate sodium
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trihydrate. Alendronate sodium has received regulatory approval for
marketing in the United States under the trademark FOSAMAX~.
Additionally, a compound of the present invention may be
co-administered with a Sa-reductase 2 inhibitor, such as finasteride or
epristeride; a Sa-reductase 1 inhibitor such as 4,7(3-dimethyl-4-aza-Sa-
cholestan-3-one, 3-oxo-4-aza-4,7~3-dimethyl-16(3-(4-chlorophenoxy)-
Sa-androstane, and 3-oxo-4-aza-4,7(3-dimethyl-16(3-(phenoxy)-Sa-
androstane as disclosed in WO 93/23420 and WO 95/11254; dual
inhibitors of Sa-reductase 1 and Sa-reductase 2 such as 3-oxo-4-aza-
17(3-(2,5-trifluoromethylphenyl-carbamoyl)-Sa-androstane as disclosed
in WO 95/07927; antiandrogens such as flutamide, casodex and
cyproterone acetate, and alpha-1 blockers such as prazosin, terazosin,
doxazosin, tamsulosin, and alfuzosin.
Further, a compound of the present invention may be used
in combination with growth hormone, growth hormone releasing
hormone or growth hormone secretagogues, to delay puberty in growth
hormone deficient children, which will allow them to continue to gain
height before fusion of the epiphyses and cessation of growth at
puberty.
For combination treatment with more than one active
agent, where the active agents are in separate dosage formulations, the
active agents may be administered separately or in conjunction. In
addition, the administration of one element may be prior to, concurrent
to, or subsequent to the administration of the other agent.
The pharmaceutical compositions containing the active
ingredient may be in a form suitable for oral use, for example, as
tablets, troches, lozenges, aqueous or oily suspensions, dispersible
powders or granules, emulsions, hard or soft capsules, or syrups or
elixirs. Compositions intended for oral use may be prepared according
to any method known to the art for the manufacture of pharmaceutical
compositions and such compositions may contain one or more agents
selected from the group consisting of sweetening agents, flavoring
agents, coloring agents and preserving agents in order to provide
pharmaceutically elegant and palatable preparations. Tablets contain the
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active ingredient in admixture with non-toxic pharmaceutically
acceptable excipients which are suitable for the manufacture of tablets.
These excipients may be for example, inert diluents, such as calcium
carbonate, sodium carbonate, lactose, calcium phosphate or sodium
phosphate; granulating and disintegrating agents, for example, corn
starch, or alginic acid; binding agents, for example starch, gelatin or
acacia, and lubricating agents, for example, magnesium stearate, stearic
acid or talc. The tablets may be uncoated or they may be coated by
known techniques to delay disintegration and absorption in the
gastrointestinal tract and thereby provide a sustained action over a
longer period. For example, a time delay material such as glyceryl
monostearate or glyceryl distearate may be employed. They may also
be coated by the technique described in the U.S. Patent 4,256,108;
4,166,452; and 4,265,874 to form osmotic therapeutic tablets for
control release.
Formulations for oral use may also be presented as hard
gelatin capsules wherein the active ingredient is mixed with an inert
solid diluent, for example, calcium carbonate, calcium phosphate or
kaolin, or as soft gelatin capsules wherein the active ingredient is mixed
with water or an oil medium, for example peanut oil, liquid paraffin, or
olive oil.
Aqueous suspensions contain the active material in
admixture with excipients suitable for the manufacture of aqueous
suspensions. Such excipients are suspending agents, for example sodium
carboxymethylcellulose, methylcellulose, hydroxypropylmethyl-
cellulose, sodium alginate, polyvinyl-pyrrolidone, gum tragacanth and
gum acacia; dispersing or wetting agents may be a naturally-occurring
phosphatide, for example lecithin, or condensation products of an
alkylene oxide with fatty acids, for example polyoxyethylene stearate,
or condensation products of ethylene oxide with long chain aliphatic
alcohols, for example heptadecaethylene-oxycetanol, or condensation
products of ethylene oxide with partial esters derived from fatty acids
and a hexitol such as polyoxyethylene sorbitol monooleate, or
condensation products of ethylene oxide with partial esters derived from
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fatty acids and hexitol anhydrides, for example polyethylene sorbitan
monooleate. The aqueous suspensions may also contain one or more
preservatives, for example ethyl, or n-propyl, p-hydroxybenzoate, one
or more coloring agents, one or more flavoring agents, and one or
more sweetening agents, such as sucrose, saccharin or aspartame.
Oily suspensions may be formulated by suspending the
active ingredient in a vegetable oil, for example arachis oil, olive oil,
sesame oil or coconut oil, or in mineral oil such as liquid paraffin. The
oily suspensions may contain a thickening agent, for example beeswax,
hard paraffin or cetyl alcohol. Sweetening agents such as those set forth
above, and flavoring agents may be added to provide a palatable oral
preparation. These compositions may be preserved by the addition of
an anti-oxidant such as ascorbic acid.
Dispersible powders and granules suitable for preparation
of an aqueous suspension by the addition of water provide the active
ingredient in admixture with a dispersing or wetting agent, suspending
agent and one or more preservatives. Suitable dispersing or wetting
agents and suspending agents are exemplified by those already
mentioned above. Additional excipients, for example sweetening,
flavoring and coloring agents, may also be present.
The pharmaceutical compositions of the invention may also
be in the form of an oil-in-water emulsions. The oily phase may be a
vegetable oil, for example olive oil or arachis oil, or a mineral oil, for
example liquid paraffin or mixtures of these. Suitable emulsifying
agents may be naturally-occurring phosphatides, for example soy beans,
lecithin, and esters or partial esters derived from fatty acids and hexitol
anhydrides, for example sorbitan monooleate, and condensation
products of the said partial esters with ethylene oxide, for example
polyoxyethylene sorbitan monooleate. The emulsions may also contain
sweetening and flavouring agents.
Syrups and elixirs may be formulated with sweetening
agents, for example glycerol, propylene glycol, sorbitol or sucrose.
Such formulations may also contain a demulcent, a preservative and
flavoring and coloring agents.
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The pharmaceutical compositions may be in the form of a
sterile injectable aqueous or oleagenous suspension. This suspension
may be formulated according to the known art using those suitable
dispersing or wetting agents and suspending agents which have been
mentioned above. The sterile injectable preparation may also be a
sterile injectable solution or suspension in a non-toxic parenterally-
acceptable diluent or solvent, for example as a solution in 1,3-butane
diol. Among the acceptable vehicles and solvents that may be employed
are water, Ringer's solution and isotonic sodium chloride solution. In
addition, sterile, fixed oils are conventionally employed as a solvent or
suspending medium. For this purpose any bland fixed oil may be
employed including synthetic mono- or diglycerides. In addition, fatty
acids such as oleic acid find use in the preparation of injectables.
Compounds of Formula I may also be administered in the
form of a suppositories for rectal administration of the drug. These
compositions can be prepared by mixing the drug with a suitable non-
irritating excipient which is solid at ordinary temperatures but liquid at
the rectal temperature and will therefore melt in the rectum to release
the drug. Such materials are cocoa butter and polyethylene glycols.
For topical use, creams, ointments, jellies, solutions or
suspensions, etc., containing the compound of Formula I are employed.
(For purposes of this application, topical application shall include mouth
washes and gargles.)
The compounds for the present invention can be
administered in intranasal form via topical use of suitable intranasal
vehicles, or via transdermal routes, using those forms of transdermal
skin patches well known to those of ordinary skill in the art. To be
administered in the form of a transdermal delivery system, the dosage
administration will, of course, be continuous rather than intermittent
throughout the dosage regimen. Compounds of the present invention
may also be delivered as a suppository employing bases such as cocoa
butter, glycerinated gelatin, hydrogenated vegetable oils, mixtures of
polyethylene glycols of various molecular weights and fatty acid esters
of polyethylene glycol.
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The dosage regimen utilizing the compounds of the
present invention is selected in accordance with a variety of factors
including type, species, age, weight, sex and medical condition of the
patient; the severity of the condition to be treated; the route of
administration; the renal and hepatic function of the patient; and the
particular compound thereof employed. A physician or veterinarian
of ordinary skill can readily determine and prescribe the effective
amount of the drug required to prevent, counter, arrest or reverse
the progress of the condition. Optimal precision in achieving
concentration of drug within the range that yields efficacy without
toxicity requires a regimen based on the kinetics of the drug's
availability to target sites. This involves a consideration of the
distribution, equilibrium, and elimination of a drug. Preferably,
doses of the compound of structural formula I useful in the method
of the present invention range from 0.01 to 1000 mg per adult
human per day. Most preferably, dosages range from 0.1 to 500
mg/day. For oral administration, the compositions are preferably
provided in the form of tablets containing 0.01 to 1000 milligrams
of the active ingredient, particularly 0.01, 0.05, 0.1, 0.5, 1.0, 2.5,
5.0, 10.0, 15.0, 25.0, 50.0, 100 and 500 milligrams of the active
ingredient for the symptomatic adjustment of the dosage to the
patient to be treated. An effective amount of the drug is ordinarily
supplied at a dosage level of from about 0.0002 mg/kg to about 50
mg/kg of body weight per day. The range is more particularly from
about 0.001 mg/kg to 1 mg/kg of body weight per day. '
Advantageously, the active agent of the present
invention may be administered in a single daily dose, or the total
daily dosage may be administered in dividend doses of two, three or
four times daily.
The amount of active ingredient that may be combined with
the carrier materials to produce a single dosage form will vary
depending upon the host treated and the particular mode of
administration.
T 1
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It will be understood, however, that the specific dose level
for any particular patient will depend upon a variety of factors
including the age, body weight, general health, sex, diet, time of
administration, route of administration, rate of excretion, drug
combination and the severity of the particular disease undergoing
therapy.
The following examples illustrate the preparation of some
of the compounds of the invention and are not to be construed as
limiting the invention disclosed herein.
EXAMPLE 1
-NH
H
° W
\ N N / \ S
o \
CI N O
H
1-f 7-chloro-2-oxo-4-(2-piperidin-2-yl-ethoxv)-3-thiophen-2-yl-1,2
dihydroc~uinolin-6-yll-3 ~vridin-4- r~l-urea
Step lA 4-chloro-5-nitro-2-(2-thiophen-2-vl-acetylamino)-benzoic
acid methXl ester
To a suspension of 2-amino-4-chloro-5-nitrobenzoic acid
methyl ester (221 mg in 2.5 mL of dry 1,2-dichloroethane) was added a
solution of thiophen-2-yl-acetyl chloride (169 mg in 3.0 mL dry 1,2-
dichloroethane) and the mixture heated at reflux on an oil bath. After
18 hours, the reaction was cooled and the solvent removed in vacuo.
Recrystallization of the crude product from methanol gave the title
compound (230 mg).
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Step 1B 7-chloro-4-hvdroxv-6-nitro-3-thiophen-2;y1-1H-quinolin-
2-one
To a solution of 4-chloro-5-nitro-2-(2-thiophen-2-yl-
acetylamino)-benzoic acid methyl ester (130 mg in 4.0 mL dry
tetrahydrofuran) at 0° C was added dropwise a solution of sodium
bis(trimethylsilyl)amide (0.92 mL of a 1.OM solution in
tetrahydrofuran) and the mixture warmed to room temperature. After
3 hours, the reaction was quenched by the addition of 6N hydrochloric
acid. The slurry was stirred for 10 minutes then filtered and washed
with ice cold acetonitrile. The residue was dried in vacuo to give the
title compound (79 mg).
Step 1C 2-f2-(7-chloro-6-nitro-2-oxo-3-thiophen-2-vl-1.2-dihvdro-
quinolin-4-~y)-ethYll-piperidine-1-carboxylic acid tert-
butvl ester
To a solution of 7-chloro-4-hydroxy-6-nitro-3-thiophen-2-
yl-1H-quinolin-2-one (50 mg in 2.5 mL of tetrahydrofuran) at 0° C was
added 44 mg of 2-(2-hydroxyethyl)-piperidine-1-carboxylic acid ter°t-
butyl ester and 63 mg of triphenylphosphine followed by 0.04 mL of
diethyl azodicarboxylate and the mixture warmed to room temperature.
After 24 hours, the solvents were removed in vacuo and the residue
purified by flash chromatography on silica gel (hexane:ethyl acetate,
90:10; then 80:20; then 60:40) to give the title compound (44 mg).
Step 1D 2-f2-(6-amino-7-chloro-2-oxo-3-thionhen-2-yl-1 2
dih~quinolin-4-vloxv)-ethyll-piperidine-1-carboxylic
acid ter-t-butyl ester
To a solution of 2-{ 2-[6-nitro-7-chloro-3-(3,5-
dimethylphenyl)-2-oxo-1,2-dihydroquinolin-4-yloxy]-ethyl } -piperidine-
1-carboxylic acid tort-butyl ester in ethanol is added tin(II)cloride
dehydrate and the mixture heated to 70° C on an oil bath. After several
hours, the reaction is cooled to room temperature and quenched by the
addition of ice-water. The acidity of the resulting solution is adjusted to
pH 8 by the addition of saturated aqueous sodium bicarbonate and the
... .....
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mixture extracted (2x) with ethyl acetate. The combined organics are
washed with brine, dried over sodium sulfate and concentrated in vacuo.
Purification of the crude oil by flash chromatography on silica gel gives
the title compound.
Step 1 E 2- ( 2-f 7-chloro-2-oxo-6-(3-pyridin-4-vl-ureido)-3-
thiophen-2-vl-1.2-dihvdroquinolin-4-vloxvl-ethyl ~-
pineridine-1-carboxylic acid tent-butyl ester
To a solution of 2-[2-(6-amino-7-chloro-2-oxo-3-thiophen-
2-yl-1,2-dihydroquinolin-4-yloxy)-ethyl]-piperidine-1-carboxylic acid
tert-butyl ester in dry methylene chloride at 0° C is added phosgene
followed by an excess of triethylamine and the mixture stirred for 1
hour at 0° C. At this time, 4-aminopyridine is added and the mixture
allowed to warm to room temperature. Upon completion of the
reaction, the mixture is diluted with ethyl acetate and the mixture
quenched by the addition of 10% citric acid. The organic portion is
concentrated in vacuo to provide the crude title compound.
Step 1F 117-chloro-2-oxo-4-(2-piperidin-2-vl-ethoxv)-3-thiophen-
2-yl-1,2-dihvdroquinolin-6-vll-3-~vridin-4 ~1-urea
To a solution of 2- { 2-[7-chloro-2-oxo-6-(3-pyridin-4-yl-
ureido)-3-thiophen-2-yl-1,2-dihydroquinolin-4-yloxy]-ethyl } -
piperidine-1-carboxylic acid tort-butyl ester in methylene chloride is
added trifluoroacetic acid and the mixture stirred at room temperature.
After 30 minutes, the mixture is concentrated in vacuo, resolvated in
10% ammonium hydroxide in methanol and concentrated once again.
Purification by flash chromatography on silica gel gives the title
compound.
PREPARATION OF SYNTHETIC INTERMEDIATES
2-amino-4-chloro-_5-nitrobenzoic acid methyl ester
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Step A: 2-acetvlamino-4-chloro-5-nitrobenzoic acid meth, l~ ester
To a solution of 3 mL conc. sulfuric acid and 0.40 mL of
90% nitric acid at 0° C was added 2-acetylamino-4-chlorobenzoic acid
~vmethyl ester ( 1.5 g) in three portions over a period of 20 minutes. This
was stirred at 0° C for 30 minutes then allowed to warm to room
temperature for an additional 1 hour. At this time the reaction was
poured into 50 mL of an ice/water mixture and extracted with ethyl
acetate (3x 50 mL). The combined organics were washed sequentially
with water (2x 50 mL), 10% sodium bicarbonate (2x 50 mL) and brine
(50 mL) then dried over magnesium sulfate and concentrated in vacuo.
Recrystallization of the crude product from methanol gave the title
compound { 1.02 g).
Step B: 2-amino-4-chloro-5-nitrobenzoic acid methyl ester
To a solution of 2-acetylamino-4-chloro-5-nitrobenzoic
acid methyl ester (1.02 g in 1S mL methanol) was added 1 mL of conc.
sulfuric acid and the mixture heated to reflux on an oil bath. After 1
hour, the mixture was concentrated in vacuo and the resulting solid
dissolved in 200 mL ethyl acetate. This was then washed with 10%
sodium bicarbonate (2x 100 mL) and brine (100 mL) and the organics
dried over magnesium sulfate. The concentrate was recrystallized from
methanol to give the title compound (0.82 g).
2-(2-hydrox~~piperidine-1-carboxylic acid tort-butyl ester
Step AA: 2-(diazoacet~)piperidine-1-carboxylic acid tent-but
ester
To a solution of piperidine-1,2-dicarboxylic acid 1-tert-
butyl ester (3.0 g in a mixture of 26 mL dry tetrahydrofuran and 26
mL dry diethyl ether) at -i0° C was added 1.91 mL of triethylamine
followed by the dropwise addition of 1.78 mL isobutyl chloroformate.
The reaction was stirred at -10° C for 30 minutes then warmed to
0° C.
Over the next hour, 26 mL of a solution of diazomethane in diethyl
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ether was added (prepared from: 8.0 g Diazald~ in 70 mL diethyl
ether; 4g potassium hydroxide; 20 mL 2-(2-ethoxyethoxy)ethanol; 6 mL
water and 12 mL diethyl ether using a mini Diazald Kit) and the
mixture allowed to stir at room temperature for an additional 2 hours.
At this time the reaction was quenched by the addition of 3 mL acetic
acid at 0° C. This was then diluted with 100 mL water and 100 mL
diethyl ether,' the layers separated and the aqueous portion extracted
with (2x 75 mL) diethyl ether. The combined organics were washed
with water (75 mL), saturated sodium bicarbonate (2x 75 mL) and
brine (75 mL) then dried over magnesium sulfate. Removal of the
solvent in vacuo and purification of the residue by flash
chromatography on silica gel (hexane:ethyl acetate, 8:2) gave the title
compound (2.99 g).
Step BB: 2-(methoxvcarbonvlmethyl)piperidine-1-carbox.
acid tort-bull ester
To a solution of 2-(diazoacetyl)piperidine-1-carboxylic acid tort-butyl
ester (5.90 g in 90 mL dry methanol) was added dropwise a solution of
silver benzoate (265 mg in 3 mL triethylamine) and the mixture stirred
at room temperature. After 2 hour, charcoal was added and the
suspension filtered over diatomaceous earth. The mixture was
concentrated in vacuo and the residue dissolved in ethyl acetate {400
mL), washed with water (2x 100 mL) and brine (150 mL). The organic
portion was dried over magnesium sulfate and the concentrate purified
by flash chromatography on silica gel (hexane:ethyl acetate, 8:2) to give
the title compound (5.47 g).
Step CC: 2-(2-hvdroxyethvl)-piperidine-1-carboxylic acid tert-
butvl ester
To a slurry of lithium aluminum hydride (580 mg in 65
mL dry diethyl ether) at 0° C was added dropwise a solution of 2-
(methoxycarbonylinethyl)piperidine-1-carboxylic acid tert-butyl ester
(5.47 g in 40 mL dry diethyl ether) over a period of 30 minutes. The
reaction was allowed to continue at 0° C for an additional hour, at
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which time it was quenched by the careful addition of 0.58 mL water
followed by 0.58 mL 2N sodium hydroxide and 1.8 mL water. The
resulting suspension was stirred vigourousIy for 30 minutes then
filtered through diatomaceous earth. The filtrate was concentrated in
vacuo and the residue purified by flash chromatography on silica gel
(hexane:ethyl acetate, 6:4) to give the title compound (4.61 g).
Thiophen-2- 1-acetyl chloride
To a solution of 2-thiophenyl acetic acid ( 150 mg in 2.5
mL dry methylene chloride) at 0° C was added 0.004 mL N,N-
dimethylformamide followed by the dropwise addition of 0.097 mL of
oxalyl chloride. After 15 minutes the mixture was warmed to room
temperature and stirred for an additional 2.5 hours. Removal of the
solvents in vacuo provided the title compound which was used without
purification.
EXAMPLE 2
NH
H
O O ~ ~ CI
N H / I \ 'S
CI \ N O
H
7-chloro-3-(5-chlorothiophen-2-yl)-2-oxo-4-(2 pi~eridin 2~1 ethoxv)
1.2-dihvdroauinoline-6-carboxylic acid pvrimidin 4 lamide
Step 2A 4-chloro-2-f2-(5-chlorothiophen-2- 1)-acetylaminol 5 iodo
benzoic acid methyl ester
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Prepared essentially as described in EXAMPLE 1, Step A
from 5.0 g 2-amino-4-chloro-5-iodobenzoic acid methyl ester and 2.~ g
(_5-chlorothiophen-2-yl)acetyl chloride (also prepared essentially as
described in EXAMPLE 1 ) to give the title compound (5.0 g).
Step 2B 7-chloro-3-(5-chlorothiophen-2-yl)-4-hydroxv-6-iodo-1H-
quinolin-2-one
Prepared essentially as described in EXAMPLE 1, Step B
from 7.5 g (4-chloro-2-[2-(5-chlorothiophen-2-yl)-acetylamino]-5-iodo-
benzoic acid methyl ester to give the title compound (5.9 g}.
Step 2C 2-(2-f7-chloro-3-(5-chlorothiophen-2-yl)-6-iodo-2-oxo-
1,2-dihydroquinolin-4-yloxyl-ethyl 1-piperidine-1-
carboxylic acid tent-butyl ester
Prepared essentially as described in EXAMPLE l, Step C
from 520 mg 7-chloro-3-(5-chlorothiophen-2-yl)-4-hydroxy-6-iodo-
1 H-quinolin-2-one to give the title compound (612 mg).
Step 2D 4-(2-( 1-tent-butoxycarbonvlpi~eridin-2-yl)-ethoxyl-7-
chloro-3-(5-chlorothiophen-2-vl)-2-oxo-1,2-
dih,~quinoline-6-carboxylic acid
To a solution of 2-{2-[7-chloro-3-(5-chlorothiophen-2-yl)-
6-iodo-2-oxo-1,2-dihydroquinolin-4-yloxy]-ethyl } -piperidine-1-
carboxylic acid tent-butyl ester (612 mg in 15 ml methylsulfoxide) was
added 34 mg [ 1,1'-bis(diphenylphosphino)ferrocene)dichloropalladium
(II) followed by 410 mg potassium acetate and the mixture heated to
60°C under an atmosphere of carbon monoxide. After 5.5 hours, the
mixture was cooled to room temperatureand partitioned between ethyl
acetate and O.SN hydrochloric acid and extracted. The organic portion
was dried over sodium sulfate and the concentrate purified by flash
chromatography on silica gel (ethyl acetate:hexane, 20:80; then 30:70;
then 40:60; then _50:50) to give the title compound (337 mg).
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Step 2E 2- ( 2-f 7-chloro-3-(5-chlorothio~hen-2-yl)-2-oxo-6-
(pvrimidin-4-ylcarbamovl)-1,2-dih~quinolin-4- ly oxvl-
eth~l)-piperidine-1-carboxylic acid tort-but, l~r
To a solution of 4-[2-(1-tort-butoxycarbonylpiperidin-2-
yl)-ethoxy]-7-ehloro-3-(5-chlorothiophen-2-yl)-2-oxo-1,2-
dihydroquinoline-6-carboxylic acid (37 mg in 0.50 mL dry methylene
chloride) was added 1-{3-dimethylaminopropyl)-3-ethylcarbodiimide
hydrochloride (EDC, 37 mg) followed by 4-dimethylaminopyridine (8
mg) and 4-aminopyrimidine ( 1$ mg) and the mixture stirred at room
temperature. After 1 R hours, the mixture was diluted with methylene
chloride and washed with brine. The organic portion was concentrated
in vacuo and the residue purified by flash chromatography on silica gel
(methylene chloride:methanol, 95:5 + 1 % ammonium hydroxide) to
give the title compound ( 17 mg).
Step 2F 7-chloro-3-(5-chlorothiophen-2-yl)-2-oxo-4-(2-piperidin-
2-vl-ethox~ -) 1,2-dihydroduinoline-6-carbox~rlic acid
pyrimidin-4-vlamide
To a solution of 2-{2-[7-chloro-3-(5-chlorothiophen-2-yl)-
2-oxo-6-(pyrimidin-4-ylcarbamoyl)-1,2-dihydroquinolin-4-yloxy]-
ethyl } -piperidine-1-carboxylic acid tort-butyl ester ( 17 mg in 1.0 dry
methylene chloride) was added a few drops of anisole followed by 0.5
mL of trifluoroacetic acid and the mixture stirred at room temperature.
After 0.5 hours, the solvents were removed in vacuo and the resulting
residue purified flash chromatography on silica gel (methylene
chloride:methanol, 97:3 + 1 % ammonium hydroxide; then 95:5 + 1 %
ammonium hydroxide; then 90:10 + 1 % ammonium hydroxide) to give
the title compound (9.6 mg). MASS: 545 (M + H)
