Note: Descriptions are shown in the official language in which they were submitted.
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Matriptase inhibitors and uses thereof
[1] This application relates to novels compounds, pharmaceutical
compositions comprising same and uses thereof.
[2] Matriptase is a TTSP (type ll transmembrane serine protease) of
about 855 amino acids that belongs to the family of Si trypsin-like proteases.
Matriptase has been reported to be implicated in several diseases such as
cancer (Sales et at. Oncogene, 2015 January 15; 34(3): 346-356.
doi:10.1038/onc.2013.563; Zoratti et at. Nat Commun; 6: 6776.
doi:10.1038/ncomms7776; Zarif et al. Oncotarget, January 29, 2015; Vol. 6,
No. 9 : 6862; Bocheva et al. Journal of Investigative Dermatology (2009) 129,
1816-1823; doi:10.1038/jid.2008.449; and Cheng et al; Histopathology 2014,
65, 24-34. DOI: 10.1111/his.12361), osteoarthritis (Milner et al. Arthritis &
Rheumatism, Vol.62, No.7, July 2010, pp 1955-1966), atherosclerosis,
pulmonary fibrosis (Bardou et at. Am J Respir Crit Care Med Vol 193, lss 8, pp
847-860, Apr 15, 2016) and influenza (Beaulieu et al. J. Virol. 87,4237-4251
(2013)).
[3] W02012/162828 describes ketobenzothiazole peptides having
matriptase inhibition activity. While ketobenzothiazole peptides of
W02012/162828 are reported as inhibiting matriptase activity at the enzymatic
level, the activity of a representative compound of W02012/162828 (IN-1)
when tested in a cellular assay is significantly reduced. There is therefore a
need for novel matriptase inhibitors.
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[4] The present description relates to compounds of formula:
HNNH2
H2NO HN
0
H
AN ThN
N"Th-AS
H H
/ 0 40 0
NH
H2NLNH (I)
or a pharmaceutically acceptable salt thereof.
[5] According to one aspect, there is provided a compound of formula:
HNõNH2
H2NO 1-11\J
0 j- 0 crINI SsliN N
NL.
H f H
/ 0 0
IW
NH =
,
H2NNH
la
HNNH2 HNNH2
H2N-0 HN H2NO HN
0 0 NIL lik 0 0 (N=
H H
AN'ciNN S Nj-L ' I
H 0 E H H E H
/
NH 40 or IW
NH
H2N L1\1H lb H2NNH lc
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or a pharmaceutically acceptable salt thereof.
[6] According to one aspect, there is provided a pharmaceutical
composition comprising a compound as defined herein with a pharmaceutically
acceptable carrier, diluent and excipient.
[7] In one aspect, the present description relates to uses and methods
of preventing and/or treating disorders associated with matriptase activity
(in
particular excess activity).
[8] In one aspect, the present description relates to uses and methods
of preventing and/or treating disorders described herein, in particular
hyperproliferative disorders, tissue disorders, pain disorders, inflammatory
disorders, respiratory disorders, viral infections or disorders associated
with
iron overload.
[9] According to another aspect, there is provided the use of a
compound or composition as defined herein in the manufacture of a
medicament for the treatment or prevention of disorders associated with
matriptase activity (in particular excess activity).
[10] According to another aspect, there is provided the use of a
compound or composition as defined herein in the manufacture of a
medicament for the treatment or prevention of hyperproliferative disorders,
tissue disorders, inflammatory disorders, respiratory disorders, viral
infections
or disorders associated with iron overload.
[11] According to another aspect, there is provided a method for treating
disorders associated with matriptase activity (in particular excess activity)
in a
subject in need thereof which comprises administering a therapeutically
effective amount of a compound as defined herein.
[12] According to another aspect, there is provided a method for treating
hyperproliferative disorders, tissue disorders, inflammatory disorders,
respiratory disorders, viral infections or disorders associated with iron
overload
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in a subject in need thereof which comprises administering a therapeutically
effective amount of a compound as defined herein
[13] Combinations of substituents and variables envisioned by the present
description are only those that result in the formation of stable compounds.
The
term "stable", as used herein, refers to compounds which possess stability
sufficient to allow manufacture and which maintains the integrity of the
compound for a sufficient period of time to be useful for the purposes
detailed
herein (e.g., therapeutic or prophylactic administration to a subject).
Methods, Uses, Formulation and Administration
Hyperproliferative disorders
[14] In one aspect, the compounds of the present description may be
used to treat or prevent hyperproliferative disorders.
[15] In one aspect, the compounds of the present description may be
used for inhibiting tumor growth, progression and/or metastasis in a subject
in
need thereof.
[16] In other specific embodiments, the hyperproliferative disorder is
prostate adenocarcinoma, breast cancer, ovarian carcinoma, cervical
neoplasia, small cell lung cancer, non-small cell lung cancer, colon cancer,
liver
cancer, pancreatic cancer, colon cancer, renal cell carcinoma, pancreatic
ductal adenocarcinoma, uterine leiomyosarcoma, transitional cell carcinoma,
nonmelanoma skin cancer, squamous cell carcinoma, melanoma, leukemia,
larger cell carcinoma of the lymph node, central nervous system (CNS) cancer
malignant mesothelioma or glioblastoma.
[17] In one aspect the cancer is oral squamous cell carcinoma.
[18] In one aspect, the subject is a cancer patient and is treated as long
as the disease is stable or until there is tumor progression (e.g., diseases
progression, appearance of new lesions etc.).
[19] In one embodiment the compounds are used in combination with
standard chemotherapy.
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[20] In one embodiment there is provided, a pharmaceutical
composition
comprising at least one compound as defined herein or a pharmaceutically
acceptable salt thereof and one or more further therapeutic agent indicated
for
the treatment or prevention of cancer.
5 [21] In one embodiment there is provided, a pharmaceutical composition
comprising one compound as defined or a pharmaceutically acceptable salt
thereof and one or more further therapeutic agent for inhibiting the
proliferation
of cancer cells or for the treatment or prevention of cancer.
Tissue disorders
[22] In additional embodiments, compounds of the present description
can be used for the treatment or prevention of tissue or skin disorders,
including
in particular embodiments, atopic dermatitis, rosacea, psoriasis, ichthyosis,
follicular atrophoderma, hyperkeratosis, hypotrichosis, Netherton syndrome
and others.
[23] In further particular embodiments, the pathological condition is
characterized by epithelial cell proliferation or abnormal neovascularization.
Pain disorders
Pain disorders include pain, acute pain, chronic pain, nociceptive pain, acute
nociceptive pain, chronic nociceptive pain, neuropathic pain, acute
neuropathic
pain, chronic neuropathic pain, inflammatory pain, acute inflammatory pain,
chronic inflammatory pain.
In a further embodiment, the compounds may be used for the treatment of
pelvic pain, knee pain or peripheral neuropathy (primarily PH N).
Inflammatory disorders
[24] In one aspect, the compounds of the present description may also
be used be used for the treatment or prevention of rheumatoid arthritis,
chronic
tendinitis, osteoarthritis, Crohn's disease, irritable bowel syndrome (IBS),
ulcerative colitis or atherosclerosis.
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[25] In one aspect, the compounds of the present description may also
be used be used for the treatment or prevention of osteoarthritis (e.g. knee).
Respiratory disorders
[26] In one aspect, the compounds of the present description may also
be used be used for the treatment or prevention of idiopatic pulmonary
fibrosis,
cystic fibrosis, bronchitis, chronic obstructive pulmonary disease (COPD),
asthma, allergic rhinitis, ciliary dyskinesia, lung carcinoma, pneumonia or a
respiratory infection.
Viral infections
[27] In one aspect, the compounds of the present description may be
used for the treatment or prevention of orthomyxovirus infections.
[28] In one aspect, the compounds of the present description may be
used for the treatment or prevention of influenza type A, B or C infections.
[29] In one aspect, the compounds of the present description may be
used for the treatment or prevention of flu infections.
[30] As used herein, the term "flu" and "flu infection" refers to an
infectious disease caused by certain RNA viruses from the orthomyxoviridae
(e.g., influenza virus) family. It includes infections by types A, B and C
influenza
viruses. It affects birds and mammals. The most common symptoms of the
disease are chills, fever, sore throat, scratchy throat, muscle pains,
headache,
chest congestion, head congestion, coughing, weakness, exhaustion, loss of
appetite and general discomfort.
[31] Hemagglutinin (HA) protein plays an essential role in binding to and
entering into host cells during the virus infection process. Hemagglutinin
(HA)
binds to monosaccharide sialic acids that are present on the surface of its
target
host cells. The cell membrane then engulfs the virus through endocytosis and
forms endosomes. The binding affinity of a type of influenza virus to sialic
acids
on epithelial cells of the respiratory system, typically in the nose, pharynx,
trachea, bronchi, bronchioles, alveoli and lungs of mammals and intestines of
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birds, can affect the capability of the virus to infect the species and the
capability to spread among different individuals.
[32] Influenza HA is synthesized as a single protein precursor termed
HAO and since the virus does not encode any protease, host cell proteases are
required for the cleavage of HAO into subunits HAI and HA2. This cleavage is
required for the protein to change conformation in the acidic conditions in
the
endosome. This change in the protein's conformation exposes the hydrophobic
fusion peptide located in the HA2 subunit. This allows the virus to fuse with
the
host cell. The hemagglutinin proteins of pathogenic avian influenza viruses
are
characterized by multibasic cleavage sites containing furin-like recognition
sequences RXXR. Since some subtilisin-like proteases such as furin or other
proprotein convertases are ubiquitous, the HA glycoprotein of avian viruses
utilizes multiple tissues and sites for its activation and allows infection
and
replication of these viruses in many cell types (pantropicity). One of the
severe
manifestations of avian flu virus is a life-threatening encephalitis. On the
other
hand, the HA glycoprotein of non-avian viruses does not have the polybasic
furin-recognition site. These viruses have monobasic cleavage sites
recognized by other proteases (e.g., TTSPs) of the host.
[33] In one embodiment there is provided, a pharmaceutical composition
comprising at least one compound as defined herein or a pharmaceutically
acceptable salt thereof and one or more further therapeutic agent indicated
for
the treatment or prevention of orthomyxovirus infections (e.g. influenza).
[34] In one said further therapeutic agent is a viral M2 ion channel
inhibitor or a neuraminidase inhibitor. In another specific embodiment, said
further therapeutic agent is Tamifluml (oseltamivir), RelenzaTm (zanamivir),
laninamivir, peramivir, amantadine, rimantadine, ribavirin, vitamin C, Cold
FXTM, echinacea, ginseng or any combination thereof.
Disorders associated with iron overload
[35] In one aspect, the compounds of the present description may be
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used for the treatment or prevention disorders associated with iron overload.
Iron overload is a condition characterized by increased levels of iron. Iron
overload can result in excess iron deposition in various tissues and can lead
to
tissue and organ damage.
[36] In one aspect, the iron overload disorder is thalassemia (e.g. 6-
thalassemia) or hemochromatosis.
Formulations
[37] As used herein, the term "effective amount" means that amount of a
drug or pharmaceutical agent that will elicit the biological or medical
response
of a tissue, system, animal or human that is being sought, for instance, by a
researcher or clinician. Furthermore, the term "therapeutically effective
amount" means any amount which, as compared to a corresponding subject
who has not received such amount, results in improved treatment, healing,
prevention, or amelioration of a disease, disorder, or side effect, or a
decrease
in the rate of advancement of a disease or disorder. The term also includes
within its scope amounts effective to enhance normal physiological function.
[38] As used herein, the terms "treatment," "treat," and "treating" refer
to
reversing, alleviating, delaying the onset of, or inhibiting the progress of a
disease or disorder, or one or more symptoms thereof, as described herein. In
some embodiments, treatment may be administered after one or more
symptoms have developed. In other embodiments, treatment may be
administered in the absence of symptoms. For example, treatment may be
administered to a susceptible individual prior to the onset of symptoms (e.g.,
in
light of a history of symptoms and/or in light of genetic or other
susceptibility
factors). Treatment may also be continued after symptoms have resolved, for
example to prevent or delay their recurrence.
[39] The term "subject" as used herein refers to a mammal. A subject
therefore refers to, for example, dogs, cats, horses, cows, pigs, guinea pigs,
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and the like. Preferably the subject is a human. When the subject is a human,
the subject may be either a patient or a healthy human.
[40] In some embodiments, the therapeutically effective amount of a
compound as defined herein, or a pharmaceutically acceptable salt thereof,
can be administered to a subject alone or admixed with a pharmaceutically
acceptable carrier.
[41] The term "pharmaceutically acceptable carrier, adjuvant, or vehicle"
refers to a non-toxic carrier, adjuvant, or vehicle that does not destroy the
pharmacological activity of the compound with which it is formulated.
Pharmaceutically acceptable carriers, adjuvants or vehicles that may be used
in the compositions of this disclosure include, but are not limited to, ion
exchangers, alumina, aluminum stearate, lecithin, serum proteins, such as
human serum albumin, buffer substances such as phosphates, glycine, sorbic
acid, potassium sorbate, partial glyceride mixtures of saturated vegetable
fatty
acids, water, salts or electrolytes, such as protamine sulfate, disodium
hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc
salts, colloidal silica, magnesium trisilicate, polyvinyl pyrrolidone,
cellulose-
based substances, polyethylene glycol, sodium carboxymethylcellulose,
polyacrylates, waxes, polyethylene-polyoxypropylene-block polymers,
polyethylene glycol and wool fat.
[42] A "pharmaceutically acceptable derivative" means any non-toxic salt,
ester, salt of an ester or other derivative of a compound of the present
description that, upon administration to a recipient, is capable of providing,
either directly or indirectly, a compound of the present description or an
inhibitory active metabolite or residue thereof.
[43] Compositions described herein may be administered orally,
parenterally, by inhalation spray, dry powder inhalation, topically, rectally,
nasally, buccally, vaginally or via an implanted reservoir. The term
"parenteral"
as used herein includes subcutaneous, intravenous, intramuscular, infra-
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articular, intra-synovial, intrasternal, intrathecal, intrahepatic,
intralesional and
intracranial injection or infusion techniques.
[44] Liquid dosage forms for oral administration include, but are
not limited
to, pharmaceutically acceptable emulsions, microemulsions, solutions,
5 suspensions, syrups and elixirs. In addition to the active compounds, the
liquid
dosage forms may contain inert diluents commonly used in the art such as, for
example, water or other solvents, solubilizing agents and emulsifiers such as
ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl
alcohol,
benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethylformamide,
10 oils (in particular, cottonseed, groundnut, corn, germ, olive, castor,
and sesame
oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty
acid
esters of sorbitan, and mixtures thereof. Besides inert diluents, the oral
compositions can also include adjuvants such as wetting agents, emulsifying
and suspending agents, sweetening, flavoring, and perfuming agents.
[45] Injectable preparations, for example, sterile injectable aqueous or
oleaginous suspensions may be formulated according to the known art using
suitable dispersing or wetting agents and suspending agents. The sterile
injectable preparation may also be a sterile injectable solution, suspension
or
emulsion in a nontoxic parenterally acceptable diluent or solvent, for
example,
as a solution in 1,3-butanediol. Among the acceptable vehicles and solvents
that may be employed are water, Ringer's solution, U.S.P. 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 can be
employed including synthetic mono- or diglycerides. In addition, fatty acids
such as oleic acid are used in the preparation of injectables.
[46] Injectable formulations can be sterilized, for example, by
filtration
through a bacterial -retaining filter, or by incorporating sterilizing agents
in the
form of sterile solid compositions which can be dissolved or dispersed in
sterile
water or other sterile injectable medium prior to use.
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[47] In order to prolong the effect of a provided compound, it is often
desirable to slow the absorption of the compound from subcutaneous or
intramuscular injection. This may be accomplished by the use of a liquid
suspension of crystalline or amorphous material with poor water solubility.
The
rate of absorption of the compound then depends upon its rate of dissolution
that, in turn, may depend upon crystal size and crystalline form.
Alternatively,
delayed absorption of a parenterally administered compound form is
accomplished by dissolving or suspending the compound in an oil vehicle.
Injectable depot forms are made by forming microencapsule matrices of the
compound in biodegradable polymers such as polylactide-polyglycolide.
Depending upon the ratio of compound to polymer and the nature of the
particular polymer employed, the rate of compound release can be controlled.
[48] Examples of other biodegradable polymers include poly(orthoesters)
and poly(anhydrides). Depot injectable formulations are also prepared by
entrapping the compound in liposomes or microemulsions that are compatible
with body tissues.
[49] Compositions for rectal or vaginal administration are preferably
suppositories which can be prepared by mixing the compounds of the present
description with suitable non-irritating excipients or carriers such as cocoa
butter, polyethylene glycol or a suppository wax which are solid at ambient
temperature but liquid at body temperature and therefore melt in the rectum or
vaginal cavity and release the active compound.
[50] Solid dosage forms for oral administration include capsules, tablets,
pills, powders, and granules. In such solid dosage forms, the active compound
is mixed with at least one inert, pharmaceutically acceptable excipient or
carrier
such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders
such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b)
binders such as, for example, carboxymethylcellulose, alginates, gelatin,
polyvinylpyrrolidinone, sucrose, and acacia, c) humectants such as glycerol,
d)
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disintegrating agents such as agar-agar, calcium carbonate, potato or tapioca
starch, alginic acid, certain silicates, and sodium carbonate, e) solution
retarding agents such as paraffin, f) absorption accelerators such as
quaternary ammonium compounds, g) wetting agents such as, for example,
cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and
bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium
stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures
thereof.
In the case of capsules, tablets and pills, the dosage form may also comprise
buffering agents.
[51] Solid compositions of a similar type may also be employed as fillers
in
soft and hard-filled gelatin capsules using such excipients as lactose or milk
sugar as well as high molecular weight polyethylene glycols and the like. The
solid dosage forms of tablets, dragees, capsules, pills, and granules can be
prepared with coatings and shells such as enteric coatings and other coatings
well known in the pharmaceutical formulating art. They may optionally contain
opacifying agents and can also be of a composition that they release the
active
ingredient(s) only, or preferentially, in a certain part of the intestinal
tract,
optionally, in a delayed manner. Examples of embedding compositions that can
be used include polymeric substances and waxes. Solid compositions of a
similar type may also be employed as fillers in soft and hard-filled gelatin
capsules using such excipients as lactose or milk sugar as well as high
molecular weight polyethylene glycols and the like.
[52] Provided compounds can also be in micro-encapsulated form with
one
or more excipients as noted above. The solid dosage forms of tablets, dragees,
capsules, pills, and granules can be prepared with coatings and shells such as
enteric coatings, release controlling coatings and other coatings well known
in
the pharmaceutical formulating art. In such solid dosage forms the active
compound may be admixed with at least one inert diluent such as sucrose,
lactose or starch. Such dosage forms may also comprise, as is normal practice,
additional substances other than inert diluents, e.g., tableting lubricants
and
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other tableting aids such a magnesium stearate and microcrystalline cellulose.
In the case of capsules, tablets and pills, the dosage forms may also comprise
buffering agents. They may optionally contain opacifying agents and can also
be of a composition that they release the active ingredient(s) only, or
preferentially, in a certain part of the intestinal tract, optionally, in a
delayed
manner. Examples of embedding compositions that can be used include
polymeric substances and waxes.
[53] Dosage forms for topical or transdermal administration of a compound
of the present description include ointments, pastes, creams, lotions, gels,
powders, solutions, sprays, inhalants or patches. The active component is
admixed under sterile conditions with a pharmaceutically acceptable carrier
and any needed preservatives or buffers as may be required. Ophthalmic
formulation, ear drops, and eye drops are also contemplated as being within
the scope of the present description. Additionally, the description
contemplates
the use of transdermal patches, which have the added advantage of providing
controlled delivery of a compound to the body. Such dosage forms can be
made by dissolving or dispensing the compound in the proper medium.
Absorption enhancers can also be used to increase the flux of the compound
across the skin. The rate can be controlled by either providing a rate
controlling
membrane or by dispersing the compound in a polymer matrix or gel.
[54] Pharmaceutically acceptable compositions provided herein may also
be administered by nasal aerosol or inhalation. Such compositions are
prepared according to techniques well-known in the art of pharmaceutical
formulation and may be prepared as solutions in saline, employing benzyl
alcohol or other suitable preservatives, absorption promotors to enhance
bioavailability, fluorocarbons, and/or other conventional solubilizing or
dispersing agents.
[55] In another specific embodiment, the composition comprising at least
one compound as defined herein or a pharmaceutically acceptable salt thereof
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is formulated for direct administration into lungs. In another specific
embodiment the composition is formulated for administration by an inhaler or
nebulizer.
[56] Pharmaceutically acceptable compositions provided herein may be
formulated for oral administration. Such formulations may be administered with
or without food. In some embodiments, pharmaceutically acceptable
compositions of this disclosure are administered without food. In other
embodiments, pharmaceutically acceptable compositions of this disclosure are
administered with food.
[57] The amount of provided compounds that may be combined with carrier
materials to produce a composition in a single dosage form will vary depending
upon the subject to be treated and the particular mode of administration.
Provided compositions may be formulate such that a dosage of between 0.01-
100 mg/kg body weight/day of the inhibitor can be administered to a subject
receiving these compositions.
[58] It should also be understood that a specific dosage and treatment
regimen for any particular subject will depend upon a variety of factors,
including age, body weight, general health, sex, diet, time of administration,
rate of excretion, drug combination, the judgment of the treating physician,
and
the severity of the particular disease being treated. The amount of a provided
compound in the composition will also depend upon the particular compound
in the composition.
[59] Compounds or compositions described herein may be administered
using any amount and any route of administration effective for treating or
lessening the severity of the disorders or diseases as contemplated herein.
The
exact amount required will vary from subject to subject, depending on the
species, age, and general condition of the subject, the severity of the
infection,
the particular agent, its mode of administration, and the like. Provided
compounds are preferably formulated in unit dosage form for ease of
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administration and uniformity of dosage. The expression "unit dosage form" as
used herein refers to a physically discrete unit of agent appropriate for the
subject to be treated. It will be understood, however, that the total daily
usage
of the compounds and compositions of the present disclosure will be decided
5 by the attending physician within the scope of sound medical judgment.
The
specific effective dose level for any particular subject or organism will
depend
upon a variety of factors including the disorder being treated and the
severity
of the disorder; the activity of the specific compound employed; the specific
composition employed; the age, body weight, general health, sex and diet of
10 the subject; the time of administration, route of administration, and
rate of
excretion of the specific compound employed; the duration of the treatment;
drugs used in combination or coincidental with the specific compound
employed, and like factors well known in the medical arts.
[60] Pharmaceutically acceptable compositions of this disclosure can be
15 administered to humans and other animals orally, rectally, parenterally,
intracisternally, intravaginally, intraperitoneally, topically (as by powders,
ointments, or drops), buccally, as an oral or nasal spray, or the like,
depending
on the severity of the infection being treated. In certain embodiments,
provided
compounds may be administered orally or parenterally at dosage levels of
about 0.01 mg/kg to about 50 mg/kg and preferably from about 1 mg/kg to
about 25 mg/kg, of subject body weight per day, one or more times a day, to
obtain the desired therapeutic effect.
Combinations
[61] Depending upon the particular condition, or disease, to be treated,
additional therapeutic agents that are normally administered to treat that
condition may also be present in the compositions of this disclosure or
administered separately as a part of a dosage regimen. As used herein,
additional therapeutic agents that are normally administered to treat a
particular
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disease, or condition, are known as "appropriate for the disease, or
condition,
being treated."
[62] In some embodiments, the composition of a compound or compounds
described herein can be in combination with an additional therapeutic agent.
[63] It will be understood, however, that the total daily usage of the
compounds and compositions of the present description will be decided by the
attending physician within the scope of sound medical judgment. The specific
inhibitory dose for any particular subject will depend upon a variety of
factors
including the disorder being treated and the severity of the disorder; the
activity
of the specific compound employed; the specific composition employed; the
age, body weight, general health, sex and diet of the subject; the time of
administration, route of administration, and rate of excretion of the specific
compound employed; the duration of the treatment; drugs used in combination
or coincidental with the specific compound employed; and like factors well
known in the medical arts.
[64] The total daily dose of the compounds of the present description
administered to a subject in single or in divided doses can be in amounts, for
example, from 0.01 to 50 mg/kg body weight or more usually from 0.1 to 25
mg/kg body weight. Single dose compositions may contain such amounts or
submultiples thereof to make up the daily dose. In one embodiment, treatment
regimens according to the present description comprise administration to a
subject in need of such treatment from about 10 mg to about 1000 mg of the
compound(s) of the present description per day in single or multiple doses.
[65] As used herein, the term "combination," "combined," and related terms
refers to the simultaneous or sequential administration of therapeutic agents
in
accordance with the present description. For example, a provided compound
may be administered with another therapeutic agent simultaneously or
sequentially in separate unit dosage forms or together in a single unit dosage
form. Accordingly, an embodiment of the present description provides a single
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unit dosage form comprising a provided compound, an additional therapeutic
agent, and a pharmaceutically acceptable carrier, adjuvant, or vehicle for use
in the methods of the present description.
[66] The amount of both, a provided compound and additional therapeutic
agent (in those compositions which comprise an additional therapeutic agent
as described above) 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. Preferably, compositions should be
formulated such that a dosage of between 0.01 - 100 mg/kg body weight/day
of a provided compound can be administered.
[67] In those compositions which comprise an additional therapeutic agent,
that additional therapeutic agent and the provided compound may act
synergistically. Therefore, the amount of additional therapeutic agent in such
compositions will be less than that required in a monotherapy utilizing only
that
therapeutic agent. In such compositions a dosage of between 0.01 - 1,000 g/kg
body weight/day of the additional therapeutic agent can be administered.
[68] The amount of additional therapeutic agent present in the compositions
of this disclosure will be no more than the amount that would normally be
administered in a composition comprising that therapeutic agent as the only
active agent. Preferably the amount of additional therapeutic agent in the
presently disclosed compositions will range from about 50% to 100% of the
amount normally present in a composition comprising that agent as the only
therapeutically active agent.
[69] Provided compounds, or pharmaceutical compositions thereof, may
also be incorporated into compositions for coating an implantable medical
device, such as prostheses, artificial valves, vascular grafts, stents and
catheters. Vascular stents, for example, have been used to overcome
restenosis (re-narrowing of the vessel wall after injury). However, subjects
using stents or other implantable devices risk clot formation or platelet
CA 02953159 2016-12-23
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activation. These unwanted effects may be prevented or mitigated by pre-
coating the device with a pharmaceutically acceptable composition comprising
a provided compound. Implantable devices coated with a compound of the
present description are another embodiment of the present description.
[70] In another
aspect, the present description provides a method of method
of synthesizing a compound of any of the formulae herein. Another
embodiment is a method of making a compound of any of the formulae herein
using any one, or combination of, reactions delineated herein. The method can
include the use of one or more intermediates or chemical reagents delineated
herein.
[71] The recitation of a listing of chemical groups in any definition of a
variable herein includes definitions of that variable as any single group or
combination of listed groups. The recitation of an embodiment for a variable
herein includes that embodiment as any single embodiment or in combination
with any other embodiments or portions thereof. The recitation of an
embodiment herein includes that embodiment as any single embodiment or in
combination with any other embodiments or portions thereof.
Definitions
[72] As used herein, the singular forms "a", "an" and "the" are intended
to include the plural forms as well, unless the context clearly indicates
otherwise. To the extent that the terms "including", "includes", "having",
"has",
"with", or variants thereof are used in either the description and/or the
claims,
such terms are intended to be inclusive in a manner similar to the term
"comprising."
[73] The term
"about" or "approximately" means within an acceptable
error range for the particular value as determined by a person skilled in the
art,
which will depend in part on how the value is measured or determined, i.e.,
the
limitations of the measurement system. For example, "about" can mean within
1 or more than 1 standard deviation, per the practice in the art.
Alternatively,
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"about" can mean a range of up to 20%, preferably up to 10%, more preferably
up to 5%, and more preferably still up to 1% of a given value. Alternatively,
particularly with respect to biological systems or processes, the term can
mean
within an order of magnitude, preferably within 5-fold, and more preferably
within 2-fold, of a value. Where particular values are described in the
application and claims, unless otherwise stated the term "about" meaning
within an acceptable error range for the particular value should be assumed.
[74] Definitions of specific functional groups and chemical terms
are
described in more detail below. For purposes of the present description, the
chemical elements are identified in accordance with the Periodic Table of the
Elements, CAS version, Handbook of Chemistry and Physics, 75th, Ed., inside
cover, and specific functional groups are generally defined as described
therein. Additionally, general principles of organic chemistry, as well as
specific
functional moieties and reactivity, are described in Organic Chemistry, Thomas
Sorrell, University Science Books, Sausalito, 1999; Smith and March March's
Advanced Organic Chemistry, 5th, Edition, John Wiley & Sons, Inc., New York,
2001; Larock, Comprehensive Organic Transformations, VCH Publishers, Inc.,
New York, 1989; Carruthers, Some Modern Methods of Organic Synthesis, 31d
Edition, Cambridge University Press, Cambridge, 1987.
[75] Unless otherwise stated, structures depicted herein are also meant
to include all isomeric (e.g., enantiomeric, diastereomeric, and geometric (or
conformational)) forms of the structure; for example, the R and S
configurations
for each asymmetric center, Z and E double bond isomers, and Z and E
conformational isomers. Therefore, single stereochemical isomers as well as
enantiomeric, diastereomeric, and geometric (or conformational) mixtures of
the present compounds are within the scope of the present description. Unless
otherwise stated, all tautomeric forms of the compounds are within the scope
of the present description. Additionally, unless otherwise stated, structures
depicted herein are also meant to include compounds that differ only in the
presence of one or more isotopically enriched atoms. For example, compounds
having the present structures including the replacement of hydrogen by
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deuterium or tritium, or the replacement of a carbon by a 13C- or 14C-enriched
carbon are within the scope of the present description. Such compounds are
useful, for example, as analytical tools, as probes in biological assays, or
as
therapeutic agents in accordance with the present description.
5 [76] Where a particular enantiomer or diastereoisomer is
preferred, it
may, in some embodiments be provided substantially free of the corresponding
enantiomer or corresponding diastereoisomer(s), and may also be referred to
as "optically enriched" or "diastereoisomerically enriched". "Optically-
enriched"
or "diastereoisomerically enriched" as used herein, means that the compound
10 is made up of a significantly greater proportion of one enantiomer or
diastereoisomer. In certain embodiments, the compound is made up of at least
about 90% by weight of a preferred enantiomer or diastereoisomer. In other
embodiments, the compound is made up of at least about 95%, 98%, or 99%
by weight of a preferred enantiomer or diastereoisomer. Preferred enantiomers
15 or diastereoisomers may be isolated by any method known to those skilled
in
the art, including chiral high pressure liquid chromatography (HPLC) and the
formation and crystallization of chiral salts or prepared by asymmetric
syntheses. See, for example, Jacques et al., Enantiomers, Racemates and
Resolutions (Wiley Interscience, New York, 1981); Wilen, et al., Tetrahedron
20 33:2725 (1977); Eliel, E.L. Stereochemistry of Carbon Compounds (McGraw-
Hill, NY, 1962); Wilen, S.H. Tables of Resolving Agents and Optical
Resolutions, p. 268 (E.L. Eliel, Ed., Univ. of Notre Dame Press, Notre Dame,
IN 1972).
[77] The synthesized compounds may be separated from a reaction
mixture and further purified by a method such as column chromatography, high
pressure liquid chromatography, or recrystallization. Synthetic chemistry
transformations and protecting group methodologies (protection and
deprotection) useful in synthesizing the compounds described herein include,
for example, those such as described in R. Larock, Comprehensive Organic
Transformations, VCH Publishers (1989); T.W. Greene and P.G.M. Wuts,
Protective Groups in Organic Synthesis, 2d. Ed., John Wiley and Sons (1991);
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L. Fieser and M. Fieser, Fieser and Fieser's Reagents for Organic Synthesis,
John Wiley and Sons (1994); and L. Paquette, ed., Encyclopedia of Reagents
for Organic Synthesis, John Wiley and Sons (1995), and subsequent editions
thereof.
[78] Compounds of formula (I) include pharmaceutically acceptable
salts, esters and prodrugs thereof.
[79] The
term "pharmaceutically acceptable salt" refers to those salts of
the compounds formed by the process of the present description which are,
within the scope of sound medical judgment, suitable for use in contact with
the
tissues of humans and lower animals without undue toxicity, irritation,
allergic
response and the like, and are commensurate with a reasonable benefit/risk
ratio. Pharmaceutically acceptable salts are well known in the art. For
example,
S. M. Berge, et al. describes pharmaceutically acceptable salts in detail in
J.
Pharmaceutical Sciences, 66: 1-19 (1977). The salts can be prepared in situ
during the final isolation and purification of the compounds of the present
description, or separately by reacting the free base function with a suitable
organic acid. Examples of pharmaceutically acceptable salts include, but are
not limited to, nontoxic acid addition salts, or salts of an amino group
formed
with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric
acid, sulfuric acid and perchloric acid or with organic acids such as acetic
acid,
maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by
using
other methods used in the art such as ion exchange. Other pharmaceutically
acceptable salts include, but are not limited to, adipate, alginate,
ascorbate,
aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate,
camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate,
dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate,
glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate,
hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, lau rate,
lauryl
sulfate, malate, maleate, malonate, methanesulfonate, 2-
naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate,
pamoate,
pectinate, persulfate, 3-phenylpropionate, phosphate, picrate, pivalate,
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propionate, stearate, succinate, sulfate, tartrate, thiocyanate, p-
toluenesulfonate, undecanoate, valerate salts, and the like. Representative
alkali or alkaline earth metal salts include sodium, lithium, potassium,
calcium,
or magnesium salts, and the like. Further pharmaceutically acceptable salts
include, when appropriate, nontoxic ammonium, quaternary ammonium, and
amine cations formed using counterions such as halide, hydroxide,
carboxylate, sulfate, phosphate, nitrate, alkyl having from 1 to 6 carbon
atoms,
sulfonate and aryl sulfonate.
[80] As used herein, the term "pharmaceutically acceptable ester" refers
to esters of the compounds formed by the process of the present description
which hydrolyze in vivo and include those that break down readily in the human
body to leave the parent compound or a salt thereof. Suitable ester groups
include, for example, those derived from pharmaceutically acceptable aliphatic
carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and
alkanedioic
acids, in which each alkyl or alkenyl moiety advantageously has not more than
6 carbon atoms. Examples of particular esters include, but are not limited to,
formates, acetates, propionates, butyrates, acrylates and ethylsuccinates.
[81] The term "pharmaceutically acceptable prodrugs" as used herein refers
to those prodrugs of the compounds formed by the process of the present
description which are, within the scope of sound medical judgment, suitable
for
use in contact with the tissues of humans and lower animals with undue
toxicity,
irritation, allergic response, and the like, commensurate with a reasonable
benefit/risk ratio, and effective for their intended use, as well as the
zwitterionic
forms, where possible, of the compounds of the description. "Prodrug", as used
herein means a compound which is convertible in vivo by metabolic or chemical
means (e.g. by hydrolysis) to afford any compound delineated by the formulae
of the instant description. Various forms of prodrugs are known in the art,
for
example, as discussed in Bundgaard, (ed.), Design of Prodrugs, Elsevier
(1985); Widder, et al. (ed.), Methods in Enzymology, vol. 4, Academic Press
(1985); Krogsgaard-Larsen, et al., (ed). "Design and Application of Prodrugs,
Textbook of Drug Design and Development", Chapter 5, 113-191 (1991);
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Bundgaard, et al., Journal of Drug Deliver Reviews, 8:1-38(1992); Bundgaard,
J. of Pharmaceutical Sciences, 77:285 et seq. (1988); Higuchi and Stella
(eds.)
Prodrugs as Novel Drug Delivery Systems, American Chemical Society (1975);
and Bernard Testa & Joachim Mayer, "Hydrolysis In Drug And Prodrug
Metabolism: Chemistry, Biochemistry And Enzymology", John Wiley and Sons,
Ltd. (2002).
EXAMPLES
[82] As used herein, the following abbreviations may have the following
meanings:
Abbreviation Term
ACN Acetonitrile
DCM Dichloromethane
DPM DPM - Dess-Martin periodinane
DIPEA N,N-Diisopropylethylamine
DMF N,N-dimethyl formamide
Et0Ac Ethyl acetate
HATU (dimethylamino)-N,N-dimethyl(3H-
[1,2,3]triazolo[4,5-b]pyridin-3-
yloxy)methaniminium hexafluorophosphate
HCI Hydrochloric acid
HFIP Hexafluoroisopropanol
iPrOH Isopropanol
UPLC-Ms Ultra perfomance liquid chromatography
mass spectrum
min Minute(s)
Me0H Methanol
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MsCI Methanesulfonyl chloride
Mtr 4-Methoxy-2,3,6-
trimethylbenzenesulphonyl
NMR Nuclear magnetic resonance
SFC Supercritical fluid chromatography
THF Tetrahydrofuran
TEA Trifluoroacetic acid
EXAMPLE 1: Synthesis of compound 1
HININH2
1
H2N,r0 HN
0 0
N ___ILNI II
AN cFIJ-1-N S
H 1 H
IW
NH
H2NINH
CI
0 0
H IFIA a
, Fmoc0-0
P HS . CI -=-:- 0¨CI + Fmoc' 0
i
1411 *
b,c,b
TrtHN 0
TrtHN 0
TrtHN 0 0
0 0 ill
0 0N OH e A
H II o H2N i 0-0
H
N N _c-) .. d
.... _____ 0
I% H 1
/ 0 5 0
0 -
NH * NH lei H
7 BocHNNBoc 6 HONI,r,NHBoc
BocHNNBoc 0 8
NBoc
Scheme I. Solid phase synthesis of (H)Arg(Boc)2-Gln(Trt)-Phe (7).
Reagents and conditions: (a) DCM, DIPEA (b) Piperidine/DMF (20:80) (c)
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Fmoc-Gln(Trt)-0H, HATU, DIPEA, DMF (d) 8, HATU, DIPEA, DMF (e)
HFIP/DCM (20:80)
Fmoc-Phe-Resin, Intermediate 4:
5 To 10 g of CTC Resin with a loading of 1.2 mmol/g were added Fmoc-Phe-OH
(9.3g, 24mmol, 2eq) dissolved in DCM (approximately 10 mL per gram of
resin), and DIPEA (6.3mL, 3eq). The mixture was shaken vigorously for 30 -
60 min. To endcap any remaining reactive trityl chloride groups, HPLC grade
methanol was added (0.8 mL per gram of resin), and mixed for 15 minutes. The
10 resin was filtered and washed with 3 x DCM, 2 x DMF, 2 x DCM, 3 x iPrOH,
3
x DCM, then dried in vacuo.
NH2-Gln(Trt)Phe-Resin, Intermediate 5:
A solution of DMF/piperidine (20%) was added to the resin, which was then
gently shaken for 30 minutes. The resin was filtered and washed with 3 x DMF,
15 iPrOH, 3x DCM then dried in vacuo. A solution of Fmoc-Gln(Trt)-OH
(14.6g,
24mmol, 2eq), HATU (9.3g, 24mmol, 2eq) and DIPEA (1.05mL, 6mmol, 5eq)
were dissolved in DMF (approximately 10 mL per gram of resin), was added
on resin. The resin was shaken for 2 h, filtered, then with 3 x DMF, iPrOH, 3
x
DCM then dried in vacuo. A solution of DMF/piperidine (20%) was added to the
20 resin, which was then gently shaken for 30 minutes. The resin was
filtered and
washed with 3 x DMF, iPrOH, 3x DCM then dried in vacuo.
(H)Arg(Boc)2-Gln(Trt)-Phe-Resin, Intermediate 6:
A solution of (H)Arg(Boc)2-0H 8 (8.7g, 24mmol, 3eq), HATU (9.3g, 24mmol,
3eq) and DIPEA (1.05mL, 6mmol, 5eq) were dissolved in DMF (approximately
25 10 mL per gram of resin), and was added on to the resin. The resin was
shaken
for 2 h, filtered, washed with 3 x DMF, iPrOH, 3 x DCM then dried in vacuo.
(H)Arg(Boc)2-Gln(Trt)-Phe-OH Intermediate 7:
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To 10 g of derivatized resin was added a solution 20% HFIP in DCM and
shaken for 45 minutes. After removal of the solution, the resin was washed
with
DCM/HFIP (20%), 3 x DCM. After suspension and co-evaporation in
diethylether, the white solid was filtrated and dried in vacuo to give
tripeptide 7
as a white solid (8.8g). The compound was used as it in the next step without
purification. Purity: >95% by UPLC.
H
,
TrtHN 0 H HN N 7 'Pbf
HN,7N,Pbf TrtHNO HN
) a
HN 1'Isl IN'-)01-1 +
H li i
H
1W H2N S
IN,1H
OH ir
7 1%1F1
BocHNNBoc 3 22
BocHNNBoc
1 b
H
HNyN,Pbf
HN NH2
Y TrtHN 0 HN,,
H2NO HN
c
_ 2011 On IN,1 .
H E li S
NH irNH
H2NNH
Example 1 BocHNNBoc 23
'
Scheme 2. Solution synthesis of compound 1. Reagents and conditions:
(a) HATU, DIPEA, DMF, 74% (b) DMP, DCM, 86%. (c) TFA/H20 (95:5)
To a solution of Intermediate 7 (3.72g, 4.25mmol, 1 eq) in anhydrous DMF were
added HATU (1.61g, 4.25mmol, 1.1 eq), amine 3 (2.55g, 4.68mmol, 1.1 eq),
and DIPEA (2.2mL, 12.7mmol, 3 eq) at 0 C. The mixture was stirred 15
minutes. The tetrapeptide was precipitated in cold water (0 C), filtrated and
washed twice with cold water. The filtrate was dissolved in ethyl acetate,
washed with aqueous citric acid (10%) and brine. The organic phase was dried
with sodium sulfate, filtrated and evaporated. The white solid was triturated
in
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ether and purified by flash chromatography (Me0H/DCM 1:99 to Me0H/DCM
5:95). Intermediate 22 was obtained as a white solid (3.2g, 52%).
DMP (1.2g, 2.8mmol, 1.4 eq) was added to a solution of protected tetrapeptide
22 (2.8g, 2mmol, 1 eq) in DCM for 15 minutes. The solution was washed with
water, aqueous citric acid 10% and brine. The organic phase was dried with
sodium sulfate and evaporated. The residue was triturated in cold ether and
purified by flash chromatography (Me0H/DCM 1:99 to Me0H/DCM 5:95) to
give the desired intermediate 23 as a white solid (2.4g, 86%).
2.4g of intermediate 23 is dissolved in a mixture of 20mL of TFA/H20 (95:5)
and stirred for 1 hour, until completion of the reaction by UPLC-MS. The
TFA/H20 solution was added dropwise to 2 x 35 ml of cold water (0 C) in two
centrifugation tubes and then centrifuged at 4000 rpm for 30 minutes. The
supernatant was removed and the white precipitated dissolved in water,
washed with ether and lyophilized. A >95:5 mixture of diastereomer in favor of
the S diastereomer of the arginine alpha carbon was obtained (1.3g).
Compound is purified by reverse phase prep-HPLC MS (C18) using a
ACN/water gradient (0.1% TFA) from 10 to 30% of ACN. As an example, 27
mg of pure compound was obtained from 50 mg of crude.
UPLC-Ms Retention time: 1.19 min
Purity: >99%
HRMS: Calculated for C33H45N1105S: 708.3404 (MH+); Found: 708.3534 (MW)
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BUILDING BLOCK SYNTHESIS
9 1, N
0 OH N 0
H HtCC)
N N.,../Ts) Boc xi , (s),
Pbf ' y ii- Pbf ' y El- Pbf'Y BocN
NH NH NH 3 H
1 2
/
0 *I * 0 NI,
Pbf =
1 OH . Nli
N N
Pbf ' y ., NI:12 .41- N N (s)
,Boc
NH CI Pbf' y N
NH
A
Synthesis of Intermediate: 2
0
0 OH NH(Me)0Me. HCI
N 0
H H HATU,DIPEA,THF H H
N
Pbf N N RT Boc __ x
Pbf , N y N
Boc
H
H
NH Step-1 NH
1 2
Procedure
To a stirred solution of Intermediate 1 (35 g, 66.4 mmol) in anhydrous THE
(700
mL) was added HATU (37.9 g, 99.6 mmol), N,0-dimethylhydroxylamine.HCI
(7.77 g, 79.7 mmol) and DIPEA (35.7 mL, 199.3 mmol) at room temperature
and the reaction mixture was allowed to stir overnight. The solvent was
evaporated and the crude material was purified by column chromatography
using silica gel, eluting with 60-65% ethyl acetate in hexanes. The pure
product
fractions were collected to afford 35 g of pure product as a white solid in
92%
yield. Chiral HPLC purity: 98.88%, MN+ 569.72
Synthesis of Intermediate: 3
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o/
lik N
T
, ii ,o Benzothiazole o
H H n-BuLi, THF H H S'
PbfNI) , Boc _________________________________ ),
pbf ,N N N) , Boc
NH H Step-2 NH H
3
2
Procedure
To a stirred solution of benzothiazole (21 mL, 189.56 mmol) in anhydrous THF
(125 mL) was added n-BuLi (1M in hexane) (110 mL, 112.33 mmol) at -78 C
by cannula over a period of 20 minutes and stirred for 30 minutes, followed by
the addition of solution of Intermediate 2 (12 g, 21.06 mmol) in anhydrous THF
(75 mL) within a minute. After 5 minutes, a saturated solution of ammonium
chloride (100 mL) was added and the reaction extracted with ethyl acetate (500
mL x 3). The combined the organic layers were washed with brine (100 mL),
dried over anhydrous sodium sulphate and evaporated under vacuum to afford
the crude product. The crude material was purified by silica gel column
chromatography, eluting with 2% methanol in dichloromethane. The pure
product fractions were collected and evaporated to afford 6.5 g of pure
compound in 48% yield. Chiral HPLC SFC purity: S-isomer (82.09%), R-isomer
(16.59%). MH+ 643.95
Synthesis of intermediate A
. N
o ii NI
'
S'
H H NaBH4/Me0H H H
Ni N sNi) -20 C Pbr yN N
, Boc ______________________________________ ' N 5 OH
Pbr (s) ,
Boc
H H
NH Step-3 NH
3 A
Procedure
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To a stirred solution of Intermediate 3 (13 g, 20.18 mmol) in Me0H (150 mL)
at -20 C was added sodium borohydride (4.58 g, 121.12 mmol) portion wise
and stirred for 30 min. After 30 min, acetone (150 mL) was added and the
reaction mixture was stirred for 30 minutes. The solvent was evaporated under
5 reduced pressure and water (300 mL) was added to the residue and then
extracted with ethyl acetate (500 mL x 3). The combined organic layer was
washed with brine (500 mL), dried over anhydrous sodium sulphate and
evaporated under vacuum to afford the crude product. The crude material was
purified by silica gel column chromatography, eluting with 3% methanol in
10 dichloromethane. The pure product fractions were collected and
evaporated to
afford 9.6 g of pure intermediate A in 74% yield. 1H-NMR (DMSO-c16) 5 8.07-
8.05 (d, 1H, -ArH), 7.94-7.92 (d, 1H, -ArH), 7.50-7.46 (dd, 1H, -ArH), 7.46-
7.38
(dd, 1H, -ArH), 6.79-6.35 (bs, 3H, -NH), 4.86-4.84 (m, 1H, -CH), 3.39 (m, 1H, -
CH), 2.95 (bs, 4H, -CH2), 2.49-2.41 (m, 6H, -CH3), 1.99 (s, 3H, -CH3) and 1.44-
15 1.11 (m, 17H, -CH2, -CH3). Chiral HPLC purity (in 4 peaks): 100%, MH+
645.83.
EXAMPLE 2: Matriptase inhibition
Materials
Purified recombinant human matriptase, was prepared as described in Desilets
A et. al 2006, Inhibition of human matriptase by eglin c variants. FEBS Lett.
Apr
20 17;580(9):2227-32. Matriptase was active-site titrated with the burst
titrant 4-
methylumbelliferyl-p-guanidino benzoate (MUGB).
General Kinetic Methods
K determination using steady-state velocities
Enzymatic assays and k determination were performed at room temperature
25 in an assay buffer containing 50 mM Tris-HCI, 150 mM NaCI and 500 pg/mL
BSA at pH 7.4. To determine which method to use for the evaluation of
inhibition, 0.25 nM protease was added to a reaction buffer containing 0 nM,
2.5 nM or 1 mM of inhibitors and 200pM of a fluorogenic substrate (Boc-Gln-
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Ala-Arg-AMC). Proteolytic activity was monitored by measuring the release of
fluorescence (excitation; 360 nm, emission; 441 nm) in a FLX800 TBE
microplate reader (Bio-Tek Instruments, Winooski, VT-, USA).
If inhibition occurs only at I/E > 10, data generated from plots of enzyme
velocity as a function of substrate concentration at several inhibitor
concentrations were fitted by nonlinear regression to equations describing
different models of reversible inhibition (competitive, uncompetitive, non-
competitive and mixed model). The preferred model was used for k
determination.
If substantial inhibition occurred using a ratio I/E 10, compounds were
treated
as tight-binding inhibitors. Plots of enzyme velocity as a function of
inhibitor
concentrations were fitted by nonlinear regression analysis to the Morrison
equation for k determination of tight-binding inhibitors.
All assays were performed at least three times in duplicates, and data were
presented as mean standard error of the mean (SEM). Nonlinear regression
and statistical analysis were performed using GraphPad Prism version 6.02 for
Windows (GraphPad Software, San Diego, CA, USA).
Kinetic parameters determination using progress curve analysis
Matriptase cleavage of Boc-Gln-Ala-Arg-AMC was monitored (excitation; 360
nm, emission; 460 nm) 1200 min using a FLX-800 TBE microplate reader (Bio-
Tek Instruments, Winooski, VT, USA).
Equations representing one- and two-step mechanisms of reaction were used
to fit the data from the progress curves obtained in the presence of different
inhibitor concentrations. Data fitting was performed using Dynafit version
4.07.066.
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When rapid equilibrium was assumed, the ON rates for ES and El formation
(ki and k3) were fixed at 100 pM-1s-1, and k2 at 8,400 s-1 for matriptase to
satisfy
experimental Km value. Calculated Kcat was fixed to 9.52 s-1.
Enzyme inactivation rate ((1E) and enzyme concentration ([E]) were determined
by curve fitting in the absence of inhibitor when fixing substrate
concentration
([S]). Determined values were used as fixed values to determine k3, k4, k5 and
k6 values with kinetics in presence of inhibitors. Inhibitor concentrations
(VD
were fitted except for the lowest concentration that was fixed.
For the two-step model, the inhibition constants were calculated as: K =
k4/k3,
K* = K k6/(k5+k6), kon = k5 and koff = ka k6 / (1(4 + k5 + k6) The
dissociation half-
life of the enzyme-inhibitor complex was calculated as t112 = 0.693 / koff.
For the
one-step model, kon and koff were equal to k3 and 1(4, respectively.
The results are shown in Table 1.
EXAMPLE 3: Cellular Assay-Influenza virus replication PR8 and X31 in
Calu-3 human bronchial epithelial cells
The ability of the tested compound to block influenza virus replication (PR8
and
X31) in Calu-3 human bronchial epithelial cells was evaluated as described by
Beaulieu A. et al. J Virol. 2013 Apr;87(8):4237-51.
Calu-3 cells were washed with Dulbecco's phosphate-buffered saline (D-PBS)
and exposed to influenza virus (diluted in incomplete medium; 0.2% bovine
serum albumin [BSA] instead of FBS). After virus adsorption (1 h at 37 C),
cells
were washed once with D-PBS, and cells were incubated in incomplete culture
medium containing increasing concentrations of the tested compound for 48h.
Viral titers were determined in the supernatants of infected cells by viral
plaque
assays as described by Cloutier et al. J Infect Dis. 2012 Feb 15;205(4):621-
30.
Serial 10-fold dilutions of clarified supernatants were prepared in incomplete
Eagle's minimal essential medium (EMEM) (containing 0.1% bovine serum
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=
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albumin instead of fetal bovine serum) and were titered on Madin-Darby canine
kidney (MDCK) cells according to standard viral plaque assays. Confluent
MDCK cells were exposed to lung supernatant dilutions for 1 hour to allow
virus
adsorption. Cells were then washed, and a semifluid medium containing Avicel
RC-581 (FMC BioPolymer), incomplete EMEM, and 1 pg/mL Tosyl
phenylalanyl chloromethyl ketone (TPCK)-treated trypsin (Sigma-Aldrich) was
added to the cells. Cells were incubated for 48 hours, and viral plaques were
revealed with 2% crystal violet after Carnoy fixation.
The data shows that the tested compound inhibited PR8 H1N1 and X31 H3N2
influenza virus replication in a dose dependent manner. The results are shown
in Table 1.
Table 1
rnpound Tested
Matriptase calu3_pr8_H1N1 calu3 x31_H3N2
co
Structure Ki EC50 ¨EC5o
(avg) nM (avg) nM (avg) nM
o Y
Comparative --cp
0.0114 5069.3 7698.3
#1
NN
N 0
Comparative
0.0877 N/A 5689
#2 r riN 41,
N"--y y
0
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NTN
N n
o o
Example 1 N,A
0.1341 27.333 20.867
N
