Note: Descriptions are shown in the official language in which they were submitted.
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CRYSTALLINE FORMS OF A PHARMACEUTICAL COMPOUND
FIELD OF THE INVENTION
The present invention relates to crystalline forms of a compound and the use
of such forms
in the preparation of a medicament, in particular for the treatment of
Parkinson's disease.
BACKGROUND OF THE INVENTION
The compound with the structure outlined below is presently in clinical trials
for Parkinson's
disease (Idrugs, 2003, 6(4), 377-383).
H
N O
S S
N O N
HO CO2Me
This compound is in the following referred to as Compound I. The chemical name
of
Compound I is [9S-(9a,10[i, 12a)]-5,16-Bis[(ethylthio)methyl]-2,3,9,10,11,12-
hexahydro-
10-hydroxy-9-methyl-l -oxo-9,12-epoxy-1 H-diindolo [1,2,3-fg:3',2', I '-
kl]pyrrolo [3,4-
i][1,6]benzodiazocine-l0-carboxylic acid methyl ester.
The following references relate to Compound I, in particular to methods for
its preparation
[J.Med. Chem. 1997, 40(12), 1863-1869; Curr. Med. Chem. - Central Nervous
System
Agents, 2002, 2(2), 143-155] and its potential medical uses, mainly in
diseases in the central
nervous system (CNS), in particular for treatment of neurodegenerative
diseases, e.g.
Parkinson's disease, Alzheimer's disease, Huntington's disease, peripheral
neuropathy,
AIDS dementia, and ear injuries such as noise-induced hearing loss [Progress
in Medicinal
Chemistry (2002), 40, 23-62; Bioorg. Med. Chem. Lett. 2002,12(2), 147-150;
Neuroscience,
Oxford, 1998, 86(2), 461-472; J. Neurochemistry (2001), 77(3), 849-863; J.
Neuroscience
(2000), 20(1), 43-50; J. Neurochemistry (2002), 82(6), 1424-1434; Hearing
Research, 2002,
166(1-2), 33-43].
The following patent documents relate to Compound I, including its medical use
and
synthesis: WO 9402488, W09749406, US 5621100, EP 0651754 and EP 112 932.
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2
By the known methods, Compound I is synthesized in a solid amorphous form. The
inventors have now discovered 5 crystalline forms of Compound I (named alpha,
beta,
gamma, delta and epsilon) thereby providing an opportunity to improve the
manufacturing
process of Compound I and its pharmaceutical use. There exists a need for
crystalline forms,
which may exhibit desirable and beneficial chemical and physical properties.
There also
exists a need for reliable and reproducible methods for the manufacture,
purification, and
formulation of Compound Ito permit its feasible commercialisation.
SUMMARY OF THE INVENTION
In a first aspect the present invention relates to crystalline Compound I, in
particular to
crystalline forms of Compound I.
Accordingly, the invention provides a crystalline form of Compound I named
alpha and
characterized by one or more of. (i) the X-Ray powder diffractogram shown in
Figure 1 as
measured using CuKa radiation; (ii) an X-Ray powder diffractogram as measured
using
CuKa radiation having reflections at 20 angles: 5.2, 7.3, 8.1, 10.1, 10.4,
11.2, 13.2,.15.1,
15.5, 17.3, 21.7, 23.8, 25.1 (iii) the solid state Carbon-13 NMR spectrum
shown in Figure 7;
(iv) the NIR reflectance spectrum shown in Figure 10.
In a further aspect the invention provides a crystalline form of Compound I
named beta and
characterized by one or more of. (i) the X-Ray powder diffractogram shown in
Figure 2 as
measured using CuKa radiation; (ii) an X-Ray powder diffractogram as measured
using
CuKa radiation having reflections at 20 angles: 6.6, 8.9, 10.7, 11.4, 11.7,
13.7, 17.0, 18.5,
18.8, 19.2, 20.3, 24.4, 30.6; (iii) the solid state Carbon-13 NMR spectrum
shown in Figure
8; (iv) the NIR reflectance spectrum shown in Figure 11.
In a still further aspect the invention provides a crystalline form of
Compound I named
gamma and characterized by one or more of. (i) the X-Ray powder diffractogram
shown in
Figure 3 as measured using CuKa radiation; (ii) an X-Ray powder diffractogram
as
measured using CuKa radiation having reflections at 20 angles: 7.5, 8.3, 9.6,
11.5, 11.8,
12.5, 15.9, 16.3, 16.7, 17.2, 18.0, 19.3, 21.0, 28.1; (iii) the solid state
Carbon-13 NMR
spectrum shown in Figure 9; (iv) the NIR reflectance spectrum shown in Figure
12.
In a further aspect the invention provides a crystalline form of Compound I
named delta and
characterized by one or more of. (i) the X-Ray powder diffractogram shown in
Figure 13 as
measured using CuKa radiation; (ii) an X-Ray powder diffractogram as measured
using
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DEC 1 7 2
3
L
CuKa radiation having reflections at 20 angles: 7.3, 8.3, 9.7, 11.1, 11.7,
12.1, 15.6, 16.1,
17.3, 18.3, 20.9, 22.1, 22.2, 25.7, 25.8.
In a further aspect the invention provides a crystalline form of Compound I
named epsilon
and characterized by one or more of: (i) the X-Ray powder diffractogram shown
in Figure
15 as measured using CuKa radiation; (ii) an X-Ray powder diffractogram as
measured
using CuKa radiation having reflections at 20 angles: 8.9, 9.2, 10.2, 12.6,
14.2, 14.6, 17.0,
18.6, 20.4, 21.1, 23.9, 25.2.
The invention further relates to methods for preparing the crystalline forms
of the invention
and the use of such forms in the preparation of a medicament comprising
Compound I as an
active ingredient.
The invention further provides solid Compound I containing crystalline
Compound I
alpha form, wherein Compound I has the formula defined above.
The invention further provides a method for preparing crystalline Compound I,
characterised in that said crystalline Compound I is formed in a solvent of
methanol
with 0% to about 8% water, wherein Compound I has the formula defined above.
The invention further provides crystalline Compound I obtainable by the above-
mentioned method.
The invention further provides a method for the manufacturing of Compound I,
which
method comprises a step wherein Compound I is converted to crystalline
Compound I,
wherein Compound I has the formula defined above.
The invention further provides a method for the manufacturing of a
pharmaceutical
composition of Compound I which method comprises preparing said composition
from
crystalline Compound I, wherein Compound I has the formula defined above.
The invention further provides a pharmaceutical composition comprising an
effective
amount of crystalline Compound I and a pharmaceutically acceptable carrier.
The invention further provides a use of crystalline Compound I in the
preparation of a
medicament for the treatment of a CNS disease.
The invention further provides a use of crystalline Compound I in the
preparation of a
medicament for the treatment of Parkinson's disease.
The invention further provides a use of crystalline Compound I for treating a
neurodegenerative disease.
The invention further provides a use of crystalline Compound I for treating
Parkinson's
disease.
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DEC 17 2008
3a
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 : Shows an x-ray powder diffractogram of Compound I alpha form.
Figure 2 : Shows an x-ray powder diffractogram of Compound I beta form.
Figure 3 : Shows an x-ray powder diffractogram of Compound I gamma form.
Figure 4 : Shows a DSC thermogram of Compound I alpha form.
Figure 5 : Shows a DSC thermogram of Compound I beta form.
Figure 6 : Shows a DSC thermogram of Compound I gamma form.
Figure 7 : Shows a solid state Carbon- 13 NMR spectrum of Compound I alpha
form.
Figure 8 : Shows a solid state Carbon-13 NMR spectrum of Compound I beta form.
Figure 9 : Shows a solid state Carbon-13 NMR spectrum of Compound I gamma
form.
Figure 10 : Shows a NIR reflectance spectrum of Compound I alpha form.
Figure 11 : Shows a NIR reflectance spectrum of Compound I beta form.
Figure 12: Shows a NIR reflectance spectrum of Compound I gamma form.
Figure 13: Shows an x-ray powder diffractogram of Compound I delta form.
Figure 14: Shows a DSC thermogram of Compound I delta form.
Figure 15: Shows an x-ray powder diffractogram of Compound I epsilon form.
Figure 16: Shows a DSC thermogram of Compound I epsilon form.
Figure 17: Shows the conformation of one of the molecules (molecule 1) in
Compound I
alpha form.
Figure 18: Shows the conformation of the other molecule (molecule 2) in
Compound I
alpha form.
Figure 19: Shows the packing of the molecules in Compound I alpha form.
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Further details for the figures are revealed in the Examples below.
DETAILED DESCRIPTION OF THE INVENTION
The discovery of a crystalline form of a pharmaceutically useful compound
provides an
opportunity to improve the performance characteristics of the pharmaceutical
product and
the manufacturing process.
Differences in physical properties, such as stability (shelf-life),
bioavailability, solubility,
and dissolution rate, exhibited by the different solid forms of a compound are
important
factors in the manufacturing and formulation of a compound. Differences in
stability can
result from changes in chemical reactivity (e.g. oxidation) or mechanical
changes (e.g.
tablets crumble on storage can lead to the conversion to a thermodynamically
more stable
crystal form) or both. The physical properties of a solid form are important
in processing,
e.g. one solid form might be more difficult to filter and wash free of
impurities. This can be
due to differences in particle shape and size distribution between one
crystalline form
relative to the other and the amorphous form.
Additionally, for drugs that exist in different crystalline forms and which
are sold in solid
form it is generally important for both medical and commercial reasons to
produce and
market a known crystalline form. The discovery of crystalline Compound I and
the
existence of 5 crystalline forms enable the development of a defined
crystalline form in
place of an amorphous solid. Also, the physical properties of the crystalline
Compound I
offer advantages for formulation development and tablet preparation, e.g.
direct
compression is facilitated by having a defined crystal form.
Crystalline compounds are generally more stable than the corresponding
amorphous
compound, and this is particularly important in the case of the air sensitive
and light
sensitive Compound I.
Experiments were carried out in a Heraeus Suntest CPS+ for the crystalline
forms alpha,
beta and gamma where the solid compound was exposed to light for 14h at 650W.
The light
treatment led to almost 60% degradation of the amorphous substance while the
crystalline
forms showed less than 30% degradation.
Compound I contains two sulphur atoms and is easily oxidised to a complex
mixture of
sulphones and sulphoxides. This sensitivity to oxidation requires great care
during
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purification of Compound I. The present invention, which makes purification of
Compound
I by crystallisation possible, reduces the levels of oxidised compounds as
compared to the
product obtained when the inventors have used other methods of purification
such as
chromatography. In addition Compound I contains an active ester group which
may undergo
5 transesterification reactions and it is also susceptible to hydrolysis.
In the final step in the synthesis of Compound I, the desired thiol ethyl side
chains are
introduced using ethyl mercaptan as a reactant [J.Med. Chem. 1997, 40(12),
1863-1869;
Curr. Med. Chem. - Central Nervous System Agents, 2002, 2(2), 143-1551. Ethyl
mercaptan
has a characteristic strong odour, which is undesirable in a pharmaceutical
product. The
isolation of Compound I as an amorphous solid results in inclusion of ethyl
mercaptan in the
solid product, while the levels of this undesired reactant is reduced through
crystallisation.
Additionally, the physical characteristics of the crystalline forms of the
invention improve
the isolation step for example by decreasing the filtration times compared to
the amorphous
form of Compound I, which is of great significance for the large scale
manufacturing of
Compound I. In this respect the delta form was found to have better filtration
properties than
the alpha form.
A further difference in the physical chemical properties of the crystalline
forms compared to
the amorphous form is the higher melting points, cf. Table I below in Example
9, which can
give advantages in further processing.
As indicated above the inventors have now discovered that Compound I_can be
made- in a
crystalline form and that there is at least 5 crystalline forms Compound I,
herein named
alpha, beta, gamma, delta and epsilon.
Thus, in a broad aspect the invention relates to crystalline Compound I, in
particular to a
crystalline form of Compound I. As used herein the expression "a crystalline
form of
Compound P comprises any crystalline forms of Compound I, i.e. in contrast to
the
amorphous form. In particular the term "crystalline Compound I" includes the
alpha, beta,
gamma, delta and/or epsilon crystalline form of Compound I, which forms are as
defined
herein.
Crystalline forms of a compound are differentiated by the positions of the
atomic nuclei in
the unit cell of the solidified compound. The differences produce different
macroscopic
properties like thermal behaviour, vapour permeability and solubility, which
as indicated
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above have practical consequences in pharmacy. The various forms described
herein may be
distinguishable from one another through the use of various analytical
techniques known to
one of ordinary skill in the art. Such techniques include, but are not limited
to'X-ray powder
diffraction (XRD), differential scanning calorimetry (DSC), solid-state
nuclear magnetic
resonance (NMR) spectroscopy, and Near-infrared (NIR) spectroscopy.
Crystalline forms of
a compound are most readily distinguished by X-ray analysis. Single crystal X-
ray
crystallography yields data that can be used to determine the positions of the
nuclei, which
in turn may be visualized with computer or mechanical models, thus providing a
three-
dimensional image of the compound. While single crystal X-ray studies provide
unmatched
structural information, they are expensive and quality data can sometimes be
difficult to
acquire. Powder X-ray diffraction is used more frequently by the
pharmaceutical industry to
characterize new crystalline forms of drugs than is single crystal X-ray
analysis. Powder X-
ray diffraction yields a fingerprint that is unique to the crystalline form
and is able to
distinguish it from the amorphous compound and all other crystalline forms of
the
compound.
Accordingly, one embodiment of the invention relates to a crystalline form of
Compound I
named alpha characterized by the X-Ray powder diffractogram shown in Figure 1
as
measured using CuKa radiation. In a further embodiment the alpha form of
Compound I is
characterized by reflections in the X-Ray powder diffractogram as measured
using CuKa
radiation at 2-theta angles: 5.2, 10.1, 10.4, 13.2, 15.1, 25.1. The alpha form
of Compound I
may also be characterized by having reflections in the X-Ray diffractogram as
measured
using CuKa radiation at 20 angles: 5.2, 7.3, 8.1, 10.1, 10.4, 11.2, 13.2,
15.1, 15.5, 17.3,
21.7, 23.8, 25.1. The alpha form of Compound I may also be characterized by
the solid state
Carbon-13 NMR spectrum shown in Figure 7. The alpha form of Compound I may
also be
characterized by the NIR reflectance spectrum shown in Figure 10. The alpha
form of
Compound I may also be characterized by having a melting point in the range of
180-
190 C. The alpha form of Compound I may also be characterized by having DSC
thermogram substantially in accordance with that shown in Figure 4. The alpha
form of
Compound I may also be characterized by a DSC thermogram having an endotherm
from
about 170 C to about 200 C. The crystal structure of the alpha form (Example
8.5) has a
space in the crystal lattice that may or may not be occupied by a smaller
solvent, in
particular a water or a methanol molecule. Thus, the crystalline alpha form of
Compound I
can be a solvate of varying amounts of water and/or methanol.
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Accordingly, the invention also relates to a crystal form characterized by
having a crystal
structure with the following characteristics at 122 K: Space group: P212121,
Unit cell
dimensions: a = 10.227(2) A, b = 23.942(2) A and c = 24.240(2) A, a = 90 , (3
= 90 , y =
90 , 2 molecules in the asymmetric unit. As the asymmetric unit in this
crystal structure
contains 2 molecules of Compound I and one solvent site, full occupancy of the
solvent site
leads to a hemi-solvate. The invention further relates to the above indicated
crystal structure
having atom positions substantially as described by the coordinates in Tables
2-4.
When indicating herein for the X-Ray powder diffractogram data the reflections
(peaks) it is
understood that the reflections are expressed in degrees (at 20 angles, i.e.
at 2-theta angles).
A further embodiment relates to a crystalline form of Compound I named beta
characterized
by the X-Ray powder diffractogram shown in Figure 2 as measured using CuKa
radiation.
In a further embodiment, the beta form is characterized by reflections in the
X-Ray powder
diffractogram as measured using CuKa radiation at 2-theta angles: 6.6, 8.9,
10.7, 11.7, 24.4,
30.6. The beta form of Compound I may also be characterized by having
reflections in the
X-Ray diffractogram as measured using CuKa radiation at 20 angles: 6.6, 8.9,
10.7, 11.4,
11.7, 13.7, 17.0, 18.5, 18.8, 19.2, 20.3, 24.4, 30.6. The beta form of
Compound I may also
be characterized by the solid state Carbon-13 NMR spectrum shown in Figure 8.
The beta
form of Compound I may also be characterized by the NIR reflectance spectrum
shown in
Figure 11. The beta form of Compound I may also be characterized by having a
melting
point in the range of 209-213 C, preferably about 211 C. The beta form of
Compound I
may also be characterized by having DSC thermogram substantially in accordance
with that
shown in Figure 5. The beta form of Compound I may also be characterized by a
DSC
thermogram having an endotherm from about 205 C to about 220 C.
A further embodiment relates to a crystalline form of Compound I named gamma
characterized by the X-Ray powder diffractogram shown in Figure 3 as measured
using
CuKa radiation. In one embodiment, the gamma form is characterized by
reflections in the
X-Ray powder diffractogram as measured using CuKa radiation at 2-theta angles:
9.6, 11.5,
12.5, 16.7, 19.3, 28.1. The gamma form of Compound I may also be characterized
by
having reflections in the X-Ray diffractogram as measured using CuKa radiation
at 20
angles: 7.5, 8.3, 9.6, 11.5, 11.8, 12.5, 15.9, 16.3, 16.7, 17.2, 18.0, 19.3,
21.0, 28.1. The
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gamma form of Compound I may also be characterized by the solid state Carbon-
13 NMR
spectrum shown in Figure 9. The gamma form of Compound I may also be
characterized by
the NIR reflectance spectrum shown in Figure 12. The gamma form of Compound I
may
also be characterized by having a melting point in the range of 212-218 C. The
gamma form
of Compound I may also be characterized by having DSC thermogram substantially
in
accordance with that shown in Figure 6. The gamma form of Compound I may also
be
characterized by a DSC thermogram having an endotherm from about 210 C to
about
225 C.
A further embodiment relates to a crystalline form of Compound I named delta
characterized by the X-Ray powder diffractogram shown in Figure 13 as measured
using
CuKa radiation. In one embodiment, the delta form is characterized by
reflections in the X-
Ray powder diffractogram as measured using CuKa radiation at 2-theta angles:
9.7, 12.1,
16.1, 18.3, 22.1, 22.2, 25.7, 25.8. The delta form of Compound I may also be
characterized
by having reflections in the X-Ray diffractogram as measured using CuKa
radiation at 20
angles: 7.3, 8.3, 9.7, 11.1, 11.7, 12.1, 15.6, 16.1, 17.3, 18.3, 20.9, 22.1,
22.2, 25.7, 25.8. The
delta form of Compound I may also be characterized by having a melting point
in the range
of 211-223 C. The delta form of Compound I may also be characterized by having
DSC
thermogram substantially in accordance with that shown in Figure 14. The delta
form of
Compound I may also be characterized by a DSC thermogram having an endotherm
from
about 210 C to about 228 C.
A further embodiment relates to a crystalline form of Compound I named epsilon
characterized by the X-Ray powder diffractogram shown in Figure 15 as measured
using
CuKa radiation. In one embodiment, the epsilon form of Compound I is
characterized by
reflections in the X-Ray powder diffractogram as measured using CuKa radiation
at 2-theta
angles: 8.9, 9.2, 10.2, 14.6. The epsilon form of Compound I may also be
characterized by
having reflections in the X-Ray diffractogram as measured using CuKa radiation
at 20
angles: 8.9, 9.2, 10.2, 12.6, 14.2, 14.6, 17.0, 18.6, 20.4, 21.1, 23.9, 25.2.
The epsilon form of
Compound I may also be characterized by having a melting point in the range of
180-
185 C. The epsilon form of Compound I may also be characterized by having DSC
thermogram substantially in accordance with that shown in Figure 16. The
epsilon form of
Compound I may also be characterized by a DSC thermogram having an endotherm
from
about 175 C to about 190 C.
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The invention further relates to any mixtures of the crystalline forms of the
invention, e.g. a
mixture of the alpha and gamma crystalline form of Compound I.
As used herein expressions like "crystalline form of Compound I characterized
by the X-
Ray powder diffractogram shown in Figure (1) as measured using CuKa" mean the
crystalline form of Compound I having an X-ray powder diffractogram
substantially similar
to Figure 1, i.e. exhibiting an X-ray powder diffraction pattern as
exemplified in that Figure
and measured under comparable conditions as described in Example 7.1 or by any
comparable method using CuKa radiation. This definition also applies mutatis
mutandis to
the NMR and NIR Figures, and all other X-Ray data described herein (e.g. X-Ray
peak
data) and for all of the five crystal forms identified, i.e. alpha, beta,
gamma, delta and
epsilon, respectively, such that margins of analytical variations are taken
into consideration.
The solid state Carbon- 13 NMR spectra referred to herein is preferably
measured using a
sample spinning speed of 5000Hz on a spectrometer with a CP-MAS probe. Thus,
the NMR
spectrum is preferably provided as described in Example 7.2 or by any
comparable method.
The NIR reflectance spectra referred to herein is preferably provided as
described in
Example 7.3 or by any comparable method, in particular with a resolution 2cm 1
and
correction of baseline shift and slope with Multiplicative Scatter Correction
(MSC).
In further embodiments, the invention relates to a crystalline form of
Compound I, which is
substantially pure. The term "substantially pure", as used herein, means that
the crystalline
form of Compound I, e.g. the alpha, beta, gamma, delta or epsilon form, is
having a purity
of at least about 90% including, e.g., at least about 93%, and at least about
95%.
The amorphous form of Compound I melts at a temperature about 150 C which is
easy to
distinguish from the melting points of the herein described crystalline forms
of Compound I,
cf. Table 1 in Example 9. Accordingly, within the invention is also
crystalline Compound I
having a melting point which is at least 175 C, or at least 180 C, such as in
the range of
175 C- 225 C, 180 C- 225 C, 180 C- 220 C, or 181 C-218 C, alternatively in the
range of
180 C-190 C or210-225 C.
The term "melting point" as used herein means the onset value of the melting
endotherm as
measured by DSC, cf. Example 7.4.
A further embodiment, relates to solid Compound I containing crystalline
Compound I
alpha form. The invention also relates to solid Compound I consisting mainly
of the
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crystalline alpha form of Compound I described herein. The term "mainly" in
the present
context means that the solid Compound I consists of at least 75%, such as at
least 80%, at
least 90%, or at least 95% crystalline alpha form of the total Compound I
present.
A further embodiment relates to solid Compound I containing crystalline
Compound I beta
5 form. The invention also relates to solid Compound I consisting mainly of
the crystalline
beta form of Compound I described herein. The term "mainly" in the present
context means
that the solid Compound I consists of at least 75%, such as at least 80%, at
least 90%, or at
least 95% crystalline beta form of the total Compound I present.
A further embodiment relates to solid Compound I containing crystalline
Compound I
10 gamma form. The invention also relates to solid Compound I consisting
mainly of the
crystalline gamma form of Compound I described herein. The term "mainly" in
the present
context means that the solid Compound I consists of at least 75%, such as at
least 80%, at
least 90%, or at least 95% crystalline gamma form of the total Compound I
present.
A further embodiment relates to solid Compound I containing crystalline
Compound I delta
form. The invention also relates to solid Compound I consisting mainly of the
crystalline
delta form of Compound I described herein. The term "mainly" in the present
context means
that the solid Compound I consists of at least 75%, such as at least 80%, at
least 90%, or at
least 95% crystalline delta form of the total Compound I present.
A further embodiment relates to solid Compound I containing crystalline
Compound I
epsilon form. The invention also relates to a solid Compound I consisting
mainly of the
epsilon form of Compound I described herein. The term "mainly" in the present
context
means that the solid Compound I consists of at least 75%, such as at least
80%, at least 90%,
or at least 95% crystalline epsilon form of the total Compound I present.
Broadly speaking, the novel crystalline forms of Compound I may be prepared by
a variety
of methods, including but not limited to crystallizing Compound I from a
suitable solvent.
Compound I may be prepared using methods known in the art, such as those
described
herein. By way of general guidance, Compound I may be mixed with a suitable
solvent
which may be heated to facilitate the dissolution of Compound I. The
combination of
solvent and Compound I may also be heated to facilitate assist the subsequent
conversion to
the crystalline form. Preferred temperatures in this regard may range from
about 30 C to
about the boiling point (i.e., the reflux temperature) of the solvent. More
preferred
temperatures may range from about 60 C to about the boiling point of the
solvent. The
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resulting mixture of solvent and Compound I may be cooled to initiate and/or
continue
crystallization. The mixture is preferably cooled (i.e. including natural
cooling to ambient
temperature) to a temperature which ranges from, e.g., about minus 20 C to
about 20 C, e.g.
to ambient temperature. The precipitated solids may be isolated from the
cooled mixture by
for example filtration or centrifugation, and if necessary washed with a
suitable solvent such
as, but not limited to, the solvent employed for the crystallization, and
dried in vacuo at
ambient or slightly elevated temperature, e.g. under a nitrogen purge.
Seed crystals may be added to any crystallization mixture to promote
crystallization.
As indicated above crystalline Compound I, in particular the different crystal
forms of the
invention may be prepared by (a) dissolving Compound I in a suitable solvent,
(b)
crystallizing by precipitation Compound I from the solvent, and (c) separating
the solvent
from the obtained crystalline Compound I; or alternatively by a process
comprising the steps
of. (a) suspending Compound I in suitable solvent for a period of time
sufficient to convert
it into the crystalline form, and (b) separating the alcohol from the obtained
crystalline
Compound I. Below is described how different solvents can be used to make the
different
crystal forms of Compound I, alpha, beta, gamma, delta and epsilon. In a
preferred
embodiment, the method of the invention for preparing crystalline Compound I,
including
the alpha, beta, gamma, delta or epsilon form, comprises crystallizing by
precipitation
Compound I from a suitable solvent and separating the solvent form the
obtained crystalline
Compound I. It is understood in that when referring herein to the preparation
of the different
crystal forms of the invention, and a product obtainable or more specifically
a product
obtained by such methods this also applies to "a solid Compound I containing
crystalline
Compound I", in particular as described above "a solid Compound I consisting
mainly of
one particular crystalline form of Compound I", e.g. the alpha, beta, gamma,
delta or epsilon
form.
Accordingly, in one aspect the invention relates to a method for preparing
crystalline
Compound I, characterised in that said crystalline Compound I is formed in a
solvent
selected from the group consisting of. (i) methanol with 0% to about 8% water;
(ii) an
aliphatic C3-C6 alcohol (e.g. 1-propanol, 1-butanol, 2-butanol, tert-butanol,
1-pentanol) with
4-8% water (e.g. 1-butanol with 4% water; 1-propanol with 4% water, 1-pentanol
with 4%
water, tert-butanol with 7% water, 2-butanol with 4 % water); (iii) an ester
of acetic acid
with at least 4% water present, wherein said ester of acetic acid is defined
by the formula
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= CH3CO2R, where R is a CI-C6-alkyl, e.g. ethyl acetate or isopropyl acetate
(e.g. ethyl
acetate with 4% water or isopropyl acetate with 6% water). The invention also
relates to the
crystalline Compound I obtainable, in particular obtained, by such method. In
a preferred
embodiment, this method leads to the formation of crystalline Compound I alpha
form.
In a further aspect, the invention relates to a method for preparing
crystalline Compound I,
characterised in that said crystalline Compound I is formed in the solvent
isopropyl acetate.
The invention also relates to the crystalline Compound I obtainable, in
particular obtained,
by such method. In a preferred embodiment, this method leads to the formation
of
crystalline Compound I beta form.
In a further aspect, the invention relates to a method for preparing
crystalline Compound I,
characterised in that said crystalline Compound I is formed in a solvent
selected from the
group consisting of: (i) an aliphatic CI-C3 nitrile (e.g. acetonitrile,
propionitrile) with up to
about 12% water (e.g. propionitrile with 4% water or acetonitrile with 12 %
water), it is
understood that propionitrile (CH3CH2CN) is a C3-nitrile; (ii) ethanol with 0%
to about 8%
water: (iii) an aliphatic C3-C6 alcohols (e.g. 1-propanol or 1-butanol) with
at least about 10
% water (e.g. 1-propanol 10 % water, 1-butanol 10 % water); (iv) ethyl acetate
reagent
grade. By the term "ethyl acetate reagent grade" is meant less than 0.5 %
water. The
invention also relates to the crystalline Compound I obtainable, in particular
obtained, by
such method. In a preferred embodiment, this method leads to the formation of
crystalline
Compound I gamma form.
In a further embodiment, the invention relates to a method for preparing
crystalline
Compound I, characterised in that said crystalline Compound I is formed in a
solvent
selected from the group consisting of. (i) an aliphatic C2-C6 alcohol (e.g.
ethanol,
cyclopropylmethanol or 1 propanol) with less than 4% water, e.g. less than 3%,
e.g. about
2% (e.g. cyclopropyl methanol, 1 propanol 2% water, ethanol 2% water (with no
stirring).
The invention also relates to the crystalline Compound I obtainable, in
particular obtained,
by such method. In a preferred embodiment, this method leads to the formation
of
crystalline Compound I delta form.
In a further embodiment, the invention relates to a method for preparing
crystalline
Compound I, characterised in that said crystalline Compound I is formed in the
solvent
butyl nitrile (CH3CH2CH2CN). The invention also relates to the crystalline
Compound I
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obtainable, in particular obtained, by such method. In a preferred embodiment,
this method
leads to the formation of crystalline Compound I epsilon form.
It has also been found that each of the crystalline form alpha and beta can be
converted to
the crystalline gamma form, in the presence of a suitable solvent, in
particular acetonitrile as
shown in Example 6.1. The crystalline beta form can be converted to the
crystalline alpha
form in the presence of methanol as shown in Example 6.1.
The invention also relates to a crystalline product, in particular the
crystalline forms of
Compound I obtainable, or in a preferred embodiment obtained, by a process
described
herein for the preparation of Crystalline Compound I.
The invention in a further aspect relates to a process for the preparation of
Compound I
comprising converting a crystalline form of Compound I (e.g. the alpha, beta
or gamma
form as described herein or any mixtures hereof) into the amorphous form of
Compound I.
Such process in a preferred embodiment comprises the steps of. (a) dissolving
crystalline
Compound I in an aromatic solvent, i.e. an aromatic hydrocarbon, preferably an
alkyl-
benzene such as xylene or toluene, (b) precipitating Compound I from the
aromatic solvent;
and (c) separating the aromatic solvent from the precipitated amorphous
Compound I.
As indicated above the formation of crystalline Compound I is very useful
inter alia as a
purification step in the manufacturing of Compound I for pharmaceutical use.
The invention in one aspect relates to a process for the manufacturing of
Compound I
comprising a crystallization step as described herein. Thus, one embodiment of
the
invention relates to a method for the manufacturing of Compound I, which
method
comprises a step wherein Compound I is converted to crystalline Compound I. It
is
understood that the crystalline Compound I of the invention may be prepared by
a method
as described herein, e.g. by precipitating Compound I in crystalline form from
a solvent as
described herein and separating the obtained crystalline Compound I from the
solvent.
The invention in particular relates to method for the manufacturing of
Compound I wherein
the Compound I is converted to crystalline Compound, including a crystalline
form of the
invention, e.g. the alpha or gamma form from a crude mixture of Compound I.
The term
crude mixture in this context means that the mixture comprises impurities,
e.g. oxidation
products derived from Compound I which it is desired to remove. The crude
mixture may be
separated directly from the reaction mixture, or the crude reaction mixture
may have been
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subjected to some initial purification, e.g. treating with a base. The
invention further relates
to the use of a crystalline Compound I or a solid of the invention in the
preparation of a
medicament comprising Compound I as an active ingredient.
Accordingly, the invention also relates to a method for the manufacturing of a
pharmaceutical composition of Compound I, which method comprises preparing
said
composition from crystalline Compound I as defined herein, e.g. obtained by a
method as
described herein, including a crystalline form or a solid of the invention.
One specific
embodiment relates to such use of the alpha or gamma form of the invention for
the
preparation of a pharmaceutical composition. As described earlier, preparing
the
formulations from a defined crystal form has the advantage of improved purity
and yield
and by having well defined properties, such as solubility. In this respect,
the invention also
provides a pharmaceutical composition comprising an effective amount of
Compound I
obtainable or obtained by a method of the invention for the preparation of
crystalline
Compound I, including a crystalline form of the invention, e. g. from the
alpha or gamma
form. The pharmaceutical composition may be any composition found suitable for
administration of Compound I, e.g. a solid dispersion formulation or a solid
solution
formulation.
In one embodiment, the crystalline product of the invention, i.e. including in
particular the
alpha, beta, gamma, delta or epsilon crystalline form, or mixtures thereof,
may be
formulated into a solid solution or a solid dispersion. A solid solution may
be prepared by
dissolving the crystalline product of the invention in a molten vehicle. The
solid solution is
formed upon cooling to ambient temperature. A solid dispersion may be prepared
by
dispersing the crystalline product of the invention in a molten vehicle. The
solid dispersion
is formed upon cooling to ambient temperature. The vehicle used to prepare the
solid
solution or solid dispersion may be one component or a mixture of more
components. The
vehicle used to prepare the solid solution or the solid dispersion is normally
solid or semi-
solid at room temperature and normally it has a sticky, oily or waxy
character. However, the
vehicle may also be fluid at room temperature or even at temperature below 5
C. As
examples of vehicles can be mentioned polyethylene glycols (PEG), poloxamers,
esters of
polyethylene glycols, waxes, glycerides, fatty acid alcohols, fatty acids,
sugar alcohols,
vitamin E and derivatives of vitamin E. The solid solution or solid dispersion
may be used
as is or alternatively formulated into pharmaceutical compositions like
tablets, capsules etc.
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The solid solution and solid dispersion can also be prepared by other methods
as for
example by the solvent method or the fusion method (Serajuddin, A.T.M.,
Journal of
Pharmaceutical Sciences, Vol. 88, 1058-1066). One embodiment of the invention
relates to
a pharmaceutical composition which is a solid solution made from crystalline
Compound I
5 of the invention, e.g. from the crystalline alpha or gamma form of the
invention.
Thus, the crystalline product of the invention, in particular the alpha, beta,
gamma, delta or
epsilon crystalline forms, or mixtures thereof can be used in the preparation
of a
pharmaceutical composition with Compound I in solution, e.g. a composition
similar to
those disclosed in US 6,200,968.
10 Within the invention is also a pharmaceutical composition comprising an
effective amount
of crystalline Compound I as described herein, in particular the alpha, beta,
gamma, delta or
epsilon forms defined herein or mixtures thereof, and a pharmaceutically
acceptable carrier.
The crystalline product of the invention, i.e. including the crystalline
alpha, beta, gamma,
delta or epsilon form, or mixtures thereof, may be formulated into a variety
of
15 pharmaceutical compositions. Examples of such formulations comprising a
crystalline
product of the invention (e.g. crystalline alpha, beta, gamma, delta or
epsilon forms) are
tablets, capsules, granules, powders, suppositories and suspensions. The
expression
"crystalline product of the invention" means a crystalline Compound I or a
solid Compound
I as described herein, i.e. by "solid Compound I" is in the present context
understood a solid
Compound I consisting mainly of crystalline Compound I as compared to
amorphous
Compound.
The pharmaceutical compositions according to the invention may be formulated
with
pharmaceutically acceptable carriers or diluents as well as any other
adjuvants and
excipients, e.g. in accordance with techniques such as those disclosed in
Remington: The
Science and Practice of Pharmacy, 19 Edition, Gennaro, Ed., Mack Publishing
Co., Easton,
PA, 1995.
The pharmaceutical compositions may be specifically formulated for
administration by any
suitable route such as the oral, rectal, nasal, pulmonary, topical (including
buccal and
sublingual), transdermal, intracisternal, intraperitoneal, vaginal and
parenteral (including
subcutaneous, intramuscular, intrathecal, intravenous and intradermal) route,
the oral route
being preferred. It will be appreciated that the preferred route will depend
on the general
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condition and age of the subject to be treated, the nature of the condition to
be treated and
the active ingredient chosen.
In an embodiment of the pharmaceutical composition, Compound I is administered
in an
amount of from about 0.001 to about 100 mg/kg body weight per day. Compound I
may,
e.g. be administered in a unit dosage form containing said compound in an
amount of about
0.01 to 100 mg. The total daily dose is, e.g., in the range of about 0.05 -
500 mg. The
formulations may conveniently be presented in unit dosage form by methods
known to those
skilled in the art. A typical unit dosage form for oral administration one or
more times per
day such as 1 to 3 times per day may contain from 0.01 to about 1000 mg,
preferably from
about 0.05 to about 500 mg. For parenteral routes such as intravenous,
intrathecal,
intramuscular and similar administration, typically doses are in the order of
about half the
dose employed for oral administration.
As indicated above, the following embodiments are within the invention:
Crystalline
Compound I for use as a medicament; the crystalline alpha form for use as a
medicament;
the crystalline beta form for use as a medicament; the crystalline gamma form
for use as a
medicament, the crystalline delta form for use as a medicament; the
crystalline epsilon form
for use as a medicament.
The invention further relates to the use of crystalline Compound I as
described herein e.g.
the alpha, beta, gamma, delta or epsilon form defined herein or mixtures
thereof, in the
preparation of a medicament for the treatment of a CNS disease, e.g., for
treatment of a
neurodegenerative disease, such as, e.g., Parkinson's disease, Alzheimer's
disease,
Huntington's disease, peripheral neuropathy, AIDS dementia, or ear injuries
including
noise-induced hearing loss.
Similarly, within the invention is also a method for treating a
neurodegenerative disease,
such as e.g. Parkinson's disease, Alzheimer's disease, Huntington's disease,
peripheral
neuropathy, AIDS dementia, or ear injuries including noise-induced hearing
loss,
comprising administering a pharmaceutically effective amount of crystalline
Compound I as
described herein, e.g. the alpha, beta, gamma form, delta or epsilon defined
herein or
mixtures thereof.
The above medical uses and pharmaceutical compositions, e.g. for treatment of
Parkinson's
disease, of crystalline Compound I and a crystalline form of the invention, is
likewise
applicable to the solid Compound I defined herein as comprising a crystalline
form of the
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invention, in particular a solid Compound I consisting mainly of a crystalline
form of the
invention.
The term "treatment" in connection with a disease as used herein also includes
prevention as
the case may be. The term "disease" as used herein also includes a disorder as
the case may
be.
The invention disclosed herein is further illustrated by the following non-
limiting examples.
EXAMPLES
In the following the starting material " Compound P' may, e.g., be prepared as
described by
Kaneko M. et al in J. Med. Chem. 1997, 40, 1863-1869.
Example 1. Preparation of crystalline alpha form of Compound I
Method I :
6.0 g amorphous Compound I was dissolved in 30 ml acetone. 0,6 g potassium
carbonate
was added and the suspension was stirred at room temperature for 1 hour before
it was
filtered to remove potential minor insoluble impurities and inorganic salts.
The filter cake
was washed with acetone. The filtrate was then evaporated on a rotary
evaporator under
reduced pressure at 60 C to a final volume of 10 ml to which 100 ml methanol
was added
slowly. The product separated as an oil, which almost dissolved on heating to
reflux.
Subsequently the residual insoluble impurities were removed by filtration. The
filtrate was
left with stirring at room temperature. A crystalline solid separated and was
isolated by
filtration. The filter cake was washed with methanol and dried in vacuo at 60
C overnight.
Yield 2,83 g (47%), mp=182.4 C (DSC onset value), Weight loss by heating:
0.5%,
Elemental analysis: 6.71%N, 63.93%C, 5.48%H, theoretical values corrected for
0.5% H20:
6.79%N, 64.05%C, 5.43%H. XRPD analysis conforms with the alpha form.
Method II):
5 g amorphous Compound I was dissolved in 25 ml acetone by gentle heating. 10
ml
Methanol was added very slowly until the solution got turbid. The solution was
allowed to
cool to room temperature by natural cooling. The suspension was filtered and
the filter-cake
discarded. During filtration more material precipitated in the filtrate. The
filtrate was heated
until all material redissolves. Cold methanol was then added to the solution
until
precipitation was observed. The slightly turbid solution was then heated until
all material
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was in solution. The solution was allowed to cool to room temperature, and the
precipitate
was removed by filtration. The second filter-cake was discarded. During the
filtration some
material separated in the filtrate. Heating redissolved the beginning
crystallisation in the
filtrate. Cold methanol was then added to the solution until precipitation was
observed. The
suspension was heated until a clear solution was obtained. The solution was
allowed to
reach room temperature by natural cooling. After a short period of time (15
min)
precipitation begun. The precipitated pale yellow product was isolated by
filtration and
dried in vacuo at 50 C overnight.
mp=188.9 C (DSC onset value), Weight loss by heating: 0.3%, Elemental
analysis:
6.53%N, 64.33%C, 5.43%H, theoretical values: 6.82%N, 64.37%C, 5.37%H. XRPD
analysis conforms with the alpha form.
Method III:
0.5g Compound I in a mixture of isopropyl acetate (10 mL) and water (0.6 mL)
was heated
to reflux with stirring. The compound was not completely dissolved so
isopropyl acetate (10
mL) and water (0.6 mL) were added and heated to reflux. Stirring was stopped
and the
experiment was allowed to cool to room temperature. The crystalline product
obtained were
isolated by filtration and dried in vacuo at 40 C. Yield = 0.25g, mp = 183.7
C (DSC onset
value). XRPD analysis conforms with the alpha form.
Method IV:
0.5g Compound I in a mixture of ethyl acetate (10 mL) and water (0.4 mL) was
heated to
70 C with stirring. The experiment was allowed to cool to room temperature.
The
crystalline product obtained were isolated by filtration and dried in vacuo at
40 C. XRPD
analysis conforms with the alpha form.
Example 2. Preparation of crystalline beta form of Compound I
28,0 g amorphous Compound I was dissolved in 250 ml tetrahydrofuran (THF) and
evaporated onto 60 g silica gel. The compound was purified by column
chromatography on
silica gel (0: 10 cm h: 5 cm with 2,7 1 THF/heptane 2/1). The eluent
containing the desired
compound was evaporated a rotary evaporator at reduced pressure at 50 C to a
solid (26 g).
The solid was suspended in 600 ml isopropyl acetate and the suspension heated
to reflux
until almost all material was dissolved. The suspension was cooled on a
water/ice bath. The
cold suspension was filtered, and the filter cake was washed with isopropyl
acetate and
dried in vacuo overnight at 50 C.
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Yield: 16,9 g (61%), mp=211.7 C (DSC onset value), Weight loss by heating:
0.2%,
Elemental analysis: 6.59%N, 64.63%C, 5.41%H, theoretical values: 6.82%N,
64.37%C,
5.40%H, XRPD analysis conforms with the beta form.
Example 3. Preparation of crystalline gamma form of Compound I
Method I:
g amorphous Compound I was dissolved in 75 ml acetone. 1.5 g potassium
carbonate
was added and the suspension stirred for 90 minutes. The suspension was
filtered. The
filtrate was reduced to approximately 30 ml on a rotary evaporator at reduced
pressure at
10 60 C. 150 ml Methanol was added to the reduced filtrate, and some sticky
material
separated. The suspension was heated to reflux. During the heating all
material dissolves.
The solution was allowed to cool to room temperature by natural cooling,
during this period
solid material separated. The suspension was left with stirring at room
temperature
overnight.
15 The suspension was filtered and the filter cake washed with methanol. The
filter cake was
dried in vacuo at 50 C overnight. Intermediate yield is 10,2 gram (68%).
The dry filter cake was suspended in 100 ml acetonitrile (ACN) and heated to
reflux. At
reflux a turbid solution was obtained. Additional acetonitrile was added until
a clear
solution was obtained; in total the filter cake was dissolved in 200 ml
acetonitrile including
the 100 ml used for suspension.
The solution was cooled to room temperature overnight. The following day the
crystalline
product was isolated by filtration. The filter cake was washed by a small
amount of
acetonitrile and dried in vacuo at 55 C overnight.
Yield: 6,17 g, 41%, mp=218.0 C (DSC onset value), Weight loss by heating:
<0.1%,
Elemental analysis: 6.80%N, 64.38%C, 5.43%H, theoretical values: 6.82%N,
64.37%C,
5.40%H, Purity (HPLC, area%): 98.6, XRPD analysis conforms with the gamma
form.
Method II:
0.5 g Compound I in a mixture of acetonitrile (8.8 mL) and water (1.2 mL) was
heated to 70
C with stirring. The solution was allowed to cool slowly to room temperature.
The next day
the crystalline product was isolated by filtration and dried in vacuo at 40
C, nip = 214.2 C
(DSC onset value) XRPD analysis conforms with the gamma form.
Method III:
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0.5 g Compound I in ethyl acetate (5mL) was heated to 70 C with stirring. The
solution
was allowed to cool slowly to room temperature. After 12 days the crystalline
product was
isolated by filtration and dried in vacuo at 40 C. XRPD analysis conforms
with the gamma
form.
5
Example 4 Preparation of crystalline Delta form of Compound I
Method I:
0.5 g alpha form Compound I in cyclopropyl methanol (I OmL) was heated to 70
C. The
solution was allowed to cool slowly to room temperature. After 2 days the
crystalline
10 compound was isolated by filtration and dried in vacuo at 40 C. Yield =
0.24 g, mp =
212,1 C (DSC onset value), XRPD analysis conforms with the delta form.
Method II:
0.2 g alpha form Compound I in ethanol (1 OmL) was heated to 70 C with
stirring. The
stirring was stopped and the solution was allowed to cool slowly to room
temperature. The
15 next day the crystalline product was isolated by filtration and dried in
vacuo at 40 C. Yield
= 0.15 g, mp = 221,6 C (DSC onset value), XRPD analysis conforms with the
delta form
Method III:
0.5 g Compound I in 1-propanol (15mL) was heated to 70 C with stirring. The
stirring was
stopped and the solution was allowed to cool slowly to room temperature. The
next day the
20 crystalline compound was isolated by filtration and dried in vacuo at 40
C. Yield = 0.23 g,
XRPD analysis conforms with the delta form.
Example 5 Preparation of crystalline Epsilon form of Compound I
0.5 g alpha form Compound I in butylnitrile (1 OmL) was heated to 70 C with
stirring. The
solution was allowed to cool slowly to room temperature. The next day the
crystalline
product was isolated by filtration and dried in vacuo at 40 C. Yield = 0.3 g,
mp=181,8 C
(DSC onset value), XRPD analysis conforms with the epsilon form.
Example 6 Transformation between different solid forms of Compound I
6.1 Conversions to crystalline Compound I
In the following examples are used excess of solid Compound I, i.e. compared
to the solvent
the amounts of solid Compound I is such that not all the solid material comes
into solution.
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The amounts used varied between 25-50 mg solid Compound I and 2-5 ml solvent.
In the
present context by "solid Compound I" is meant amorphous Compound I or any of
the
crystalline forms of Compound I as indicated below.
(i) Excess of amorphous Compound I was added to methanol and the resulting
suspension was stored on a rotarmix for 4 days at room temperature. After 4
days the solid
was the alpha form as determined by powder X-ray diffraction.
(ii) Excess of the crystalline alpha form of Compound I was added to methanol
and the
resulting suspension was stored on a rotarmix for 4 days at room temperature.
After 4 days
the solid was still the alpha form as determined by powder X-ray diffraction.
(iii) Excess of the crystalline beta form of Compound I was added to methanol
and the
resulting suspension was stored on a rotarmix for 4 days at room temperature.
After 4 days
the solid was the alpha form as determined by powder X-ray diffraction.
(iv) Excess of the crystalline gamma form of Compound I was added to methanol
and
the resulting suspension was stored on a rotarmix for 4 days at room
temperature. After 4
days the solid was still the gamma form as determined by powder X-ray
diffraction.
(v) Excess of a 1:1 mixture of the alpha and the gamma form of Compound I was
added
to methanol and the resulting suspension was stored on a rotarmix stored for 4
days at room
temperature. After 4 days the major part of the solid was the gamma form.
After filtration
the supernatant was left for evaporation of the solvent. The resulting solid
was the alpha
form as determined by powder X-ray diffraction.
(vi) Excess of amorphous Compound I was added to acetonitrile (ACN) and the
resulting
suspension was stored on a rotarmix for 4 days at room temperature. After 4
days the solid
was the gamma form as determined by powder X-ray diffraction.
(vii) Excess of the crystalline alpha form of Compound I was added to ACN and
the
resulting suspension was stored on a rotarmix for 4 days at room temperature.
After 4 days
the solid was the gamma form as determined by powder X-ray diffraction.
(viii) Excess of the crystalline beta form of Compound I was added to ACN and
the
resulting suspension was stored on a rotarmix for 4 days at room temperature.
After 4 days
the solid was the gamma form as determined by powder X-ray diffraction.
(ix) Excess of the crystalline gamma form of Compound I was added to ACN and
the
resulting suspension was stored on a rotarmix for 4 days at room temperature.
After 4 days
the solid was still the gamma form as determined by powder X-ray diffraction.
Conclusion:
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Amorphous Compound I and the crystalline beta form can be converted into
crystalline
alpha form in a methanol suspension.
Amorphous Compound I, the crystalline alpha form and the crystalline beta form
can be
converted into the crystalline gamma form by suspension of excess of the solid
material in
acetonitrile.
6.2 Conversions from crystalline alpha form to amorphous Compound I
g crystalline alpha form of Compound I was heated to reflux in a mixture of
Toluene
(110 mL) and methanol (1 mL); a clear solution was obtained. Under reduced
pressure the
10 solvent volume was decreased by 10 mL and the solution was cooled overnight
in a freezer.
The resulting solid was isolated by filtration, dried in vacuo over two days
at 40 C to give
13.2 g of a solid. The melting temperature of the solid was approx. 150 C
which
characterises the amorphous form of Compound I as compared to the crystalline
forms, cf.
Table I below.
Example 7 Analytical methods
(7.1) XRPD patterns were measured on a Diffractometer under one of the
following
conditions:
(i) STOE diffractometer
Radiation: Cu(Kal), germanium monochromator, X=1.540598 A
Position Sensitive Detector (PSD) covering 7
Scan type: Step scan, steps: 0.1 , 125-150 sec. pr. step
Range: 5-45 28
Sample measuring method: Transmission
(ii) PANalytical X'Pert PRO X-Ray Diffractometer using CuKaj radiation.
X'celerator detector, measuring the range 5-40 20.
Sample measuring method: Reflection
(7.2) The solid state NMR was performed under the following conditions:
The Carbon-13 CP/MAS (cross-polarization / magic-angle spinning) NMR spectra
were acquired at room temperature at 11.75 Tesla on a Bruker Avance DRX-500
spectrometer equipped with a 4 mm CP/MAS probe. The sample spinning speed was
5000Hz, and 10240 scans were acquired using a recycle delay of 5 sec. For the
cross
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polarization, spin-lock radio frequency fields of 50 kHz and a contact time of
5 msec
were employed.
(7.3) Near-infrared (NIR) data were collected with Bomem MB 160 FT/NIR
spectrometer
with Powder SamplIR. The NIR reflectance spectra were recorded between 14.000-
4.000cm-1 with resolution 2cm-1 (16 scans, high gain). Baseline shift and
slope in
NIR spectra, which is often seen in powder, were removed with Multiplicative
Scatter Correction (MSC).
(7.4) Melting points were determined on a DSC (Differential Scanning
Calorimeter) as the
onset temperature of the melting endotherm. About 2 mg of sample was heated in
an
aluminium crucible with loose lid, at 5 C/min under N2 flow.
(7.5) The crystal structure of the alpha form was determined under the
following
conditions: The diffraction data were collected on a Nonius KappaCCD
diffractometer. The data collection was performed at 122 K using
monochromatized
MoK,,, radiation (2 = 0.71073 A).
Example 8. Analytical results
8.1 X-ray powder data: The X-ray powder diffractogram (XRPD) of; the alpha
form is
shown in Figure 1; the beta form is shown in Figure 2; the gamma form is shown
in
Figure 3; the delta form is shown in Figure 13; the epsilon form is shown in
Figure 15.
The different crystalline forms are characterized by different reflections
(peaks) in the X-
Ray powder diffractogram as measured using CuKa radiation at 2-theta angles
determined:
Alpha (5.2, 10.1, 10.4, 13.2, 15.1, 25.1; 5.2, 7.3, 8.1, 10.1, 10.4, 11.2,
13.2, 15.1, 15.5,
17.3, 21.7, 23.8, 25.1);
Beta (6.6, 8.9, 10.7, 11.7, 24.4, 30.6; 6.6, 8.9, 10.7, 11.4, 11.7, 13.7,
17.0, 18.5, 18.8,
19.2, 20.3, 24.4, 30.6);
Gamma (9.6, 11.5, 12.5, 16.7, 19.3, 28.1; 7.5, 8.3, 9.6, 11.5, 11.8, 12.5,
15.9, 16.3, 16.7,
17.2, 18.0, 19.3, 21.0, 28.1);
Delta (9.7, 12.1, 16.1, 18.3, 22.1, 22.2, 25.7, 25.8; 7.3, 8.3, 9.7, 11.1,
11.7, 12.1, 15.6,
16.1, 17.3, 18.3, 20.9, 22.1, 22.2, 25.7, 25.8);
Epsilon (8.9, 9.2, 10.2, 14.6; 8.9, 9.2, 10.2, 12.6, 14.2, 14.6, 17.0, 18.6,
20.4, 21.1, 23.9,
25.2).
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8.2. DSC thermograms: The DSC thermograms are shown in Figures 4-6, 14, 16
(alpha
form in Figure 4; beta form in Figure 5; and gamma form in Figure 6, delta
form in figure
14, epsilon form in figure 16).
8.3. Solid state NMR data: The solid state NMR spectra are shown in Figure 7
for the alpha
form, Figure 8 for the beta form and Figure 9 for the gamma form.
8.4 NIR data: The NIR-spectra are shown in Figure 10 for the alpha form,
Figure 11 for the
beta form and Figure 12 for the gamma form.
8.5 Crystal structure for Compound I aloha form: The crystal structure of the
alpha form
was determined by single crystal X-ray diffraction at 122 K. The crystal used
for the
structure determination was obtained by slow precipitation from McOH and had
dimensions 0.5x0.3x0.2 mm.
The resulting crystal structure shows that the alpha form of Compound I
crystallizes in
the orthorhombic space group P212121 with the cell dimensions at 122 K of a =
10.227(2)
A, b = 23.942(2) A and c = 24.240(2) A, a = 90 , 0 = 90 , y = 90 , V =
5935.3(12) A3, Z
= 8, density = 1.378 g/cm3 (the numbers in parenthesis are standard deviations
on the last
digit). The un-weighted agreement factor was R[I>2a(I)] = 0.0699.
The asymmetric unit of the crystal contains two Compound I units, and 0-1
solvent
molecule. The solvent molecule may be either MeOH or water. In the structure
determination the atoms corresponding to solvent were found with an occupancy
of
C2":0.70, 01 ":0.50 and 03":0.36. As the asymmetric unit contains 2 molecules
of
Compound I and one solvent site, full occupancy of the site would lead to a
hemi-solvate.
The atom numbering and the conformation of the two molecules in the asymmetric
unit
are shown in Figures 17-18, and the packing of the molecules in the crystal is
shown in
Figure 19. The atom coordinates are given in Tables 2-4 below.
Table 2: Atom coordinates and equivalent isotropic displacement parameters for
non-
hydrogen atoms in molecule I
Label x y z Ueg
C11 -0.1062(9) 0.2071(4) 0.3154(5) 0.119(4)
C12 -0.0922(7) 0.2369(3) 0.2679(4) 0.097(3)
C13 0.0402(5) 0.3338(2) 0.3022(2) 0.0517(13)
C14 0.1485(4) 0.37791(19) 0.29800(19) 0.0414(10)
C15 0.1730(5) 0.4125(2) 0.34227(19) 0.0482(12)
C16 0.2157(4) 0.38580(16) 0.24912(17) 0.0331(8)
C17 0.2642(4) 0.4561(2) 0.34044(17) 0.0396(9)
C18 0.3097(3) 0.42813(15) 0.24665(15) 0.0278(7)
C19 0.3347(4) 0.46402(17) 0.29167(15) 0.0320(8)
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C20 0.3600(3) 0.37367(14) 0.12235(15) 0.0271(7)
C21 0.4226(3) 0.42266(13) 0.15070(14) 0.0233(6)
C22 0.3963(3) 0.44422(14) 0.20324(14) 0.0238(6)
C23 0.4700(3) 0.48995(14) 0.22250(14) 0.0241(6)
C24 0.5184(3) 0.41458(14) 0.06419(15) 0.0264(7)
C25 0.5168(3) 0.44565(13) 0.11709(13) 0.0215(6)
C26 0.5911(3) 0.49186(13) 0.13513(13) 0.0213(6)
C27 0.5642(3) 0.51352(14) 0.18804(13) 0.0230(6)
C28 0.6972(3) 0.52525(14) 0.11306(14) 0.0228(6)
C29 0.7277(3) 0.56606(14) 0.15290(13) 0.0234(6)
C30 0.7685(4) 0.52346(14) 0.06360(14) 0.0253(7)
C31 0.8269(4) 0.60505(15) 0.14453(16) 0.0298(7)
C32 0.8676(3) 0.56175(15) 0.05494(15) 0.0269(7)
C33 0.8947(4) 0.60199(15) 0.09522(16) 0.0298(7)
C34 0.9449(4) 0.55929(17) 0.00224(16) 0.0334(8)
C35 0.7493(5) 0.6209(3) -0.0511(2) 0.0599(15)
C36 0.6968(6) 0.5714(4) -0.0827(3) 0.083(2)
C37 0.5095(5) 0.52590(19) 0.37193(15) 0.0392(9)
C38 0.4993(4) 0.54457(16) 0.31227(14) 0.0293(7)
C39 0.4323(4) 0.60294(16) 0.30392(13) 0.0297(7)
C40 0.4783(4) 0.64389(17) 0.34996(14) 0.0345(9)
C41 0.6244(4) 0.59217(15) 0.24601(14) 0.0279(7)
C42 0.4889(4) 0.61943(15) 0.24753(14) 0.0282(7)
C43 0.6494(6) 0.7018(2) 0.3803(2) 0.0550(13)
N10 0.6453(3) 0.55884(12) 0.19786(12) 0.0273(6)
N8 0.4287(3) 0.37320(12) 0.07002(13) 0.0299(6)
N9 0.4351(3) 0.50175(13) 0.27731(12) 0.0276(6)
03 0.5841(3) 0.42305(12) 0.02296(11) 0.0336(6)
04 0.6272(3) 0.55359(11) 0.29230(10) 0.0294(5)
05 0.2968(3) 0.60128(12) 0.30872(10) 0.0334(6)
06 0.4183(4) 0.65298(14) 0.39104(11) 0.0475(8)
07 0.5939(3) 0.66596(12) 0.33752(12) 0.0417(7)
S1 0.05826(13) 0.27639(6) 0.25442(6) 0.0573(3)
S2 0.92480(12) 0.61925(5) -0.04247(5) 0.0462(3)
Table 3: Atom coordinates and equivalent isotropic displacement parameters for
non-
hydrogen atoms in molecule2
label x y z Ue4
C11' 0.3351(9) 0.2274(4) 0.3741(4) 0.107(3)
C12' 0.4501(6) 0.2572(2) 0.3960(2) 0.0535(12)
C13' 0,5141(4) 0.32653(17) 0.30754(16) 0.0320(8)
C14' 0.5962(3) 0.33381(15) 0.25640(15) 0.0284(7)
C15' 0.5818(4) 0.29548(15) 0.21266(15) 0.0295(7)
C16' 0.6877(3) 0.37626(15) 0.25214(15) 0.0264(7)
C17' 0.6562(4) 0.29896(16) 0.16476(15) 0.0309(8)
C18' 0.7644(3) 0.38027(14) 0.20460(14) 0.0245(7)
C19' 0.7470(3) 0.34216(14) 0.16046(14) 0.0246(7)
C20' 0.9106(4) 0.48618(16) 0.27155(15) 0.0295(7)
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C21' 0.9305(3) 0.46300(14) 0.21451(13) 0.0242(6)
C22' 0.8668(3) 0.41839(14) 0.18834(14) 0.0241(7)
C23' 0.9068(3) 0.40231(14) 0.13561(13) 0.0228(6)
C24' 1.0826(4) 0.53365(16) 0.22661(16) 0.0315(8)
C25' 1.0299(3) 0.49163(14) 0.18830(14) 0.0250(7)
C26' 1.0715(4) 0.47630(14) 0.13450(14) 0.0254(7)
C27' 1.0087(3) 0.43081(14) 0.10898(14) 0.0244(6)
C28' 1.1674(4) 0.49705(15) 0.09601(15) 0.0268(7)
C29' 1.1603(4) 0.46218(15) 0.04887(15) 0.0285(7)
C30' 1.2564(4) 0.54209(16) 0.09568(16) 0.0306(7)
C31' 1.2411(4) 0.47048(16) 0.00324(16) 0.0345(8)
C32' 1.3357(4) 0.55112(17) 0.05095(17) 0.0339(8)
C33' 1.3282(4) 0.51493(18) 0.00434(18) 0.0374(9)
C34' 1,4330(4) 0.59844(19) 0,0511(2) 0.0440(10)
C35' 1.2623(6) 0.6661(3) -0.0105(4) 0.077(2)
C36' 1,2183(8) 0.7019(6) 0.0358(4) 0.136(5)
C37' 0.7433(4) 0.29800(18) 0.04312(16) 0.0338(8)
C38' 0.8600(3) 0.33047(15) 0,06463(14) 0.0262(7)
C39' 0.9950(3) 0.29655(14) 0.06725(13) 0.0230(6)
C40' 0.9652(3) 0.23557(15) 0.05516(16) 0.0300(7)
C41' 1.0178(4) 0.38189(15) 0.01728(14) 0.0296(7)
C42' 1.0759(4) 0.32366(14) 0.02225(14) 0.0267(7)
C43' 0.9026(12) 0.1491(3) 0.0916(4) 0.121(4)
N10' 1.0640(3) 0.42245(12) 0.05746(12) 0.0279(6)
N8' 1.0092(3) 0.53082(14) 0.27242(14) 0.0346(7)
N9' 0.8335(3) 0.35665(13) 0.11793(12) 0.0251(6)
03' 1.1773(3) 0.56475(12) 0.21928(12) 0.0378(6)
04' 0,8822(3) 0.37370(11) 0.02552(10) 0.0306(6)
05' 1.0630(2) 0.30320(10) 0.11731(10) 0.0262(5)
06' 0.9505(3) 0.21745(12) 0.00864(13) 0.0396(7)
07' 0.9482(4) 0.20628(14) 0.10012(14) 0.0570(10)
Si' 0.57873(14) 0.26806(5) 0.34631(5) 0.0507(3)
S2' 1.42524(15) 0.64612(5) -0.00597(6) 0.0561(3)
Table 4: Atom coordinates and equivalent isotropic displacement parameters and
occupancy for atoms in the solvent entity
label x y z Ueg Occupancy
01" 0.7366(10) 0.4173(4) -0.0687(3) 0.080(4) 0.499(16)
C2" 0.6529(11) 0.4259(10) -0.1061(5) 0.143(10) 0.70(3)
03" 0.5557(18) 0.4565(8) -0.0933(5) 0.097(8) 0.36(2)
Example 9 Melting points
The melting points (cf. Example 7.4 above) obtained for the amorphous form and
the
crystalline alpha, beta, gamma delta and epsilon solid form of Compound I are
shown in
Table I below.
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Table 1
Form Approx. melting temperature:
Amorphous approx. 150 C
Cc 181-189 C
R approx. 211 C
y 212-218 C
S 211-223
6 approx. 182
