WO2019003249A1

WO2019003249A1 - Polymorphic forms of baricitinib

Info

Publication number: WO2019003249A1
Application number: PCT/IN2018/050424
Authority: WO
Inventors: Ramakoteswara Rao Jetti; Hemant Malhari MANDE; Anjaneyaraju Indukuri; Satish Chowdary NEKKANTI
Original assignee: Mylan Laboratories Limited
Priority date: 2017-06-28
Filing date: 2018-06-27
Publication date: 2019-01-03

Abstract

The present disclosure provides crystalline forms of baricitinib (formula (I)), crystalline forms of solvates of baricitinib and processes for the preparation thereof.

Description

POLYMORPHIC FORMS OF BARICITINIB

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of the earlier filing date of Indian Provisional Patent Application No. IN201 741022642 filed on June 28, 2017; Indian Provisional Patent Application No. IN201741026305 filed on July 25, 2017; Indian Provisional Patent Application No. IN201741 028880 filed on August 14, 2017.

FIELD OF THE INVENTION

The present disclosure encompasses crystalline forms of baricitinib, processes for their production and pharmaceutical compositions thereof. BACK GROUND OF THE INVENTION

Baricitinib is a janus kinase (JAK) inhibitor. It is chemically designated as 2-(3-(4-(7H-pyrrolo[2,3- d]pyrimidin-4-yl)-1 H-pyrazol-1 -yl)-1 -(ethylsulfonyl)azetidin-3-yl) acetonitrile, having the structure as depicted in Formula I.

Formula I

U.S. Patent No. 8,158,616 is hereby incorporated by reference with respect to its disclosure of baricitinib and a process for the preparation thereof. PCT Publication No. WO2015166434A1 discloses crystalline forms of baricitinib. PCT Publication No. WO2015145286A1 discloses amorphous form of baricitinib. PCT Publication No. WO201 6141891 A1 discloses various crystalline forms of baricitinib.

The present disclosure provides crystalline forms of baricitinib, crystalline forms of baricitinib hydrochloride, and processes for the preparation thereof. SUMMARY OF THE INVENTION

In one aspect, the present invention provides crystalline baricitinib Form M1 , which may be characterized by a PXRD pattern having significant peaks at 20 angles of 10.56, 14.72, 18.1 1 , and 20.62 ± 0.2°. Crystalline baricitinib Form M1 may also be characterized by a PXRD pattern as shown in Figure 1 .

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M1 . In one embodiment, crystalline baricitinib Form M1 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in sulfolane to form a solution;

adding an anti-solvent to the solution; and

c) isolating crystalline baricitinib Form M1

Within the context of this embodiment, the anti-solvent may be water, hydrocarbons, or mixtures thereof. Examples of suitable hydrocarbons include toluene, heptane, and mixtures thereof.

In one aspect, the present invention provides crystalline baricitinib Form M2, which may be characterized by a PXRD pattern having significant peaks at 20 angles of 7.22, 10.91 , 1 1 .85, 14.40, and 22.12 ± 0.2°. Crystalline baricitinib Form M2 may also be characterized by a PXRD pattern as shown in Figure 3.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M2. In one embodiment, crystalline baricitinib Form M2 may be prepared by a process that includes the steps of:

a) providing baricitinib in propanoic acid; and

b) isolating crystalline baricitinib Form M2.

In another aspect, the present invention provides crystalline baricitinib Form M4, which may be characterized by a PXRD pattern having significant peaks at 20 angles of 10.96, 16.98, 20.15, 22.16, and 26.01 ± 0.2°. Crystalline baricitinib Form M4 may also be characterized by a PXRD pattern as shown in Figure 7.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M4. In one embodiment, crystalline baricitinib Form M4 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in formic acid to form a solution;

b) adding the solution to an anti-solvent;

c) optionally seeding with crystalline baricitinib Form M4; and

d) isolating crystalline baricitinib Form M4. Within the context of this embodiment, the anti-solvent may be, for example, diethyl ether, tertiary butyl methyl ether, tetrahydrofuran, 1 ,4-dioxane, hexane, heptane, cyclohexane, cycloheptane, toluene, or mixtures thereof.

In another embodiment, crystalline baricitinib Form M4 may be prepared by a process that includes the steps of:

a) suspending crystalline baricitinib Form M3 in a hydrocarbon solvent; and

b) isolating crystalline baricitinib Form M4.

Within the context of this embodiment, the hydrocarbon may be, for example, hexane, heptane, cyclohexane, cycloheptane, toluene, or mixtures thereof.

In another aspect, the present invention provides crystalline baricitinib Form M8, which may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 16.52, 19.00, and 21 .78 ± 0.2°. Crystalline baricitinib Form M8 may also be characterized by a PXRD pattern as shown in Figure 14.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M8. In one embodiment, crystalline baricitinib Form M8 may be prepared by a process that includes the steps of:

a) dissolving crystalline baricitinib hydrochloride in a solvent;

b) adding the solution obtained in step (a) to a mixture containing of hydroxyl propyl methyl cellulose solution, crystalline baricitinib Form M8 seeds and alkaline solution; c) stirring the reaction mass to form the precipitation; and

d) isolating crystalline baricitinib Form M8.

Within the context of this embodiment, the solvent may be water, methanol, ethanol, isopropanol, or mixtures thereof. Within the context of this embodiment, the alkaline solution may be an aqueous sodium hydroxide solution, an aqueous sodium carbonate solution, an aqueous sodium bicarbonate solution, an aqueous potassium hydroxide solution, an aqueous potassium carbonate solution, an aqueous potassium bicarbonate solution, or mixtures thereof.

In another embodiment, crystalline baricitinib Form M8 may be prepared by a process that includes the step of:

a) dissolving baricitinib in a solvent to form a solution;

b) adding the solution obtained in step (a) to a mixture containing of crystalline baricitinib Form M8 seeds, water and optionally hydroxyl propyl methyl cellulose; and

c) isolating crystalline baricitinib Form M8.

Within the context of this embodiment, the solvent may be water, diglyme (diethylene glycol dimethyl ether), 1 ,2-dimethoxyethane, dimethylformamide, 1 ,4-dioxane, dimethyl sulfoxide, or mixtures thereof. In another embodiment, crystalline baricitinib Form M8 may be prepared by a process that includes the step of heating crystalline baricitinib Form M4 or crystalline baricitinib Form M6 to a temperature of 200 °C to 230 °C ± 5 °C.

BRIEF DESCRIPTION OF THE FIGURES Further aspects of the present disclosure together with additional features contributing thereto and advantages accruing there from will be apparent from the following description of embodiments of the disclosure which are shown in the accompanying drawing figures wherein :

Figure 1 is an X-ray powder diffractogram of crystalline baricitinib Form M1 ;

Figure 2 is ¹ H NMR spectrum of crystalline baricitinib Form M1 ; Figure 3 is an X-ray powder diffractogram of crystalline baricitinib Form M2;

Figure 4 is ¹ H NMR spectrum of crystalline baricitinib Form M2;

Figure 5 is an X-ray powder diffractogram of crystalline baricitinib Form M3;

Figure 6 is ¹ H NMR spectrum of crystalline baricitinib Form M3;

Figure 7 is an X-ray powder diffractogram of crystalline baricitinib Form M4; Figure 8 is ¹ H NMR spectrum of crystalline baricitinib Form M4;

Figure 9 is an X-ray powder diffractogram of crystalline baricitinib Form M5;

Figure 10 is an X-ray powder diffractogram of crystalline baricitinib Form M6;

Figure 11 is ¹ H NMR spectrum of crystalline baricitinib Form M6;

Figure 12 is an X-ray powder diffractogram of crystalline baricitinib Form M7; Figure 13 is ¹ H NMR spectrum of crystalline baricitinib Form M7;

Figure 14 is an X-ray powder diffractogram of crystalline baricitinib Form M8;

Figure 15 is an X-ray powder diffractogram of crystalline baricitinib hydrochloride Form M1 ;

Figure 16 is an X-ray powder diffractogram of crystalline baricitinib hydrochloride Form M2; and

Figure 17 is an X-ray powder diffractogram of crystalline baricitinib hydrochloride Form M3. DETAILED DESCRIPTION OF THE DISCLOSURE

The present disclosure relates to crystalline form of baricitinib. The present disclosure also relates to process for the preparation of crystalline form of baricitinib.

Within the context of the present disclosure, the term "about" when modifying a temperature measurement is meant to mean the recited temperature plus or minus five degrees. Within the context of the present disclosure, the term "about" when modifying an absolute measurement, such as time, mass, or volume, means the recited value plus or minus 10% of that value.

The crystalline forms of baricitinib and baricitinib hydrochloride disclosed herein may be characterized by powder X-ray diffraction (PXRD). Samples of each polymorph were analyzed on a BRUKER D-8 Discover powder diffractometer equipped with goniometer of Θ/2Θ configuration and Lynx Eye detector. The Cu-anode X-ray tube was operated at 40kV and 30mA. The experiments were conducted over the 2Θ range of 2.0°-50.0°, 0.030° step size, and 0.4 seconds step time.

The crystalline forms of baricitinib and baricitinib hydrochloride disclosed herein may be characterized by NMR. NMR data were collected on a Bruker 300 MHz Avance NMR spectrometer equipped with 5 mm BBI probe in DMSO-d6. The data collected were processed by Topsin-NMR software.

Thermal stability experiments were conducted on each polymorph by varying the temperature on a Bruker D8 Discover Powder X-ray diffractometer equipped with a goniometer of Θ/2Θ configuration and LYNXEYE detector with Anton Paar CHC plus Chamber. Primary Optics 0.3° opening; 2.5° soller slit on the primary and secondary optics; Nickel filter in secondary optics; Secondary optics opening 4mm. The Cu-anode X-ray tube was operated at 40kV and 40mA. The experiments were conducted over the 2Θ range of 2.0°-50.0°, 0.03° step size, and 0.2 seconds step time. Variable temperature PXRD data was measured in the temperature range of 30 °C - 230 °C.

In one aspect, the present invention provides crystalline baricitinib Form M1 .

Within the context of the present invention, crystalline baricitinib Form M1 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 10.56, 14.72, 1 8.1 1 , and 20.62 ± 0.2°. In another embodiment, crystalline baricitinib Form M1 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 10.56, 14.72, 16.22, 18.1 1 , 18.36, 19.57, and 20.62 ± 0.2°. In yet another embodiments, crystalline baricitinib Form M1 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 6.93, 10.28, 10.56, 13.74, 14.72, 15.1 0, 15.62, 16.22, 17.28, 18.1 1 , 1 8.36, 19.19, 19.57, 19.90, 20.62, 20.97, 21 .55, 22.45, 23.01 , 24.10, 24.75, 25.26, 25.86, 26.41 , 26.99, 27.16, 27.51 , 28.02, 28.92, 29.48, 30.23, 30.87, 31 .30, 31 .78, 32.18, 32.67, 33.65, 34.36, 34.79, 35.91 , 37.24, 38.13, 38.47, 38.76, 39.40, 39.49, 40.73, 41 .76, 42.67, 43.97, 44.78, 45.98, 46.72, 47.34, 47.89, and 49.1 1 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M1 is shown in Figure 1 . It is believed that crystalline baricitinib Form M1 is a solvate. It is believed that crystalline baricitinib Form M1 is a sulfolane solvate. In particular, it is believed that the ratio of baricitinib to sulfolane in Form M1 is 1 :1 . Figure 2 is a ¹ H NMR spectrum of crystalline baricitinib Form M1 .

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M1 . In one embodiment crystalline baricitinib Form M1 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in sulfolane to form a solution;

b) adding anti-solvent to the solution; and

c) isolating crystalline baricitinib Form M1 . According to this embodiment, baricitinib may be dissolved in sulfolane to form a solution. Within the context of this embodiment, this may be facilitated by carrying this step at an elevated temperature. For example, in some embodiments, baricitinib is dissolved in an organic solvent at a temperature of about 65 °C to about 85 °C.

Next, the solution may be cooled. For example, the solution may be cooled to ambient temperature. In some embodiments, the solution is slowly cooled to about 25 °C to about 35 °C.

Next, an anti-solvent may be added. In some embodiments, it is found that adding the anti-solvent slowly is particularly useful and effective at producing the desired solid product.

Within the context of this embodiment, examples of suitable anti-solvents include, but are not limited to, water, hydrocarbons, and mixtures thereof. Examples of suitable hydrocarbons include, but are not limited to, toluene, heptane, and mixtures thereof. In particularly useful embodiments, the anti- solvent is toluene or water.

Next, crystalline baricitinib form M1 may be isolated. Within the context of this embodiment of the present invention, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particular useful embodiments of the present invention the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or a combination of both. For example, in some embodiments, the solid is dried under vacuum to get crystalline baricitinib form M1 . In some embodiments, the solid obtained is dried at about 45 °C to about 55 °C under vacuum for about 36 hours to about 48 hours. One of skill in the art would recognize a variety of methods that can be used to isolate the solid.

In another aspect, the present invention provides crystalline baricitinib Form M2.

Within the context of the present invention, crystalline baricitinib Form M2 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 7.22, 10.91 , 1 1 .85, 14.40, and 21 .12 ± 0.2°. In another embodiment, crystalline baricitinib Form M2 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 7.22, 10.91 , 1 1 .85, 14.40, 1 6.96, 17.88, 19.83, 21 .78, and 22.12 ± 0.2°. In yet another embodiment, crystalline baricitinib Form M2 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 7.22, 9.46, 10.91 , 1 1 .85, 14.02, 14.40, 15.18, 1 6.96, 17.35, 17.88, 18.86, 19.15, 19.41 , 19.83, 20.62, 21 .15, 21 .47, 21 .78, 22.12, 22.71 , 22.98, 23.56, 24.29, 25.42, 25.74, 26.06, 26.74, 27.27, 27.56, 28.36, 28.50, 28.99, 30.05, 30.50, 30.87, 31 .34, 31 .81 , 32.94, 33.37, 33.74, 34.31 , 35.60, 35.98, 36.31 , 37.32, 38.22, 38.86, 39.85, 40.90, 41 .89, 42.13, 44.03, 45.75, 46.74, and 47.56 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M2 is shown in Figure 3. It is believed that crystalline baricitinib Form M2 is a propanoic acid solvate. In particular, it is believed that the ratio of baricitinib to propanoic acid in Form M2 is 1 :1 . Figure 4 is a ¹ H NMR spectrum of crystalline baricitinib Form M2.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M2. In one embodiment, baricitinib Form M2 may be prepared by a process that includes the steps of:

a) providing baricitinib in propanoic acid; and

b) isolating crystalline baricitinib Form M2.

Within the context of this embodiment, baricitinib may be suspended in propanoic acid. The suspension may then be agitated for an extended period of time, for example, for about 1 hour to about 16 hours. In some embodiments, the suspension is agitated for 1 hour. In other embodiments, the suspension is agitated for 16 hours.

Next, crystalline baricitinib form M2 may be isolated. Within the context of this embodiment of the present invention, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. After being obtained, the solid may be further treated, for example, by washing. In some embodiments, the solid is washed with a hydrocarbon solvent and dried under vacuum. In particular useful embodiments of the present invention the solid is isolated by filtration followed by washing with heptane and drying. In some embodiments, the solid obtained is dried at about 30 °C for about 14 hours to about 16 hours.

In another aspect, the present invention provides crystalline baricitinib Form M3. Within in the context of the present invention, crystalline baricitinib Form M3 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 8.44, 12.56, 1 7.05, and 19.31 ± 0.2°. In another embodiment, crystalline baricitinib Form M3 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 3.04, 6.21 , 8.44, 9.40, 1 1 .46, 12.56, 13.40, 15.07, 16.13, 16.47, 17.05, 17.71 , 18.98, and 19.31 ± 0.2°. In yet another embodiment, crystalline baricitinib Form M3 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 3.04, 6.21 , 8.44, 9.40, 1 1 .46, 12.56, 13.40, 15.07, 16.13, 16.47, 17.05, 17.71 , 1 8.98, 19.31 , 19.69, 20.83, 21 .1 5, 21 .97, 22.26, 23.09, 23.78, 24.41 , 24.88, 25.35, 25.73, 26.01 , 26.42, 27.69, 28.38, 29.15, 29.74, 30.66, 32.61 , 34.05, 36.48, 37.92, 38.67, 41 .28, 42.52, 43.10, and 44.25 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M3 is shown in Figure 5. It is believed that crystalline baricitinib Form M3 is a formic acid solvate. In particular, it is believed that crystalline baricitinib Form M3 is a formic acid sesqui solvate (that is, the ratio of baricitinib to formic acid is 1 :1 .5). Figure 6 is a ¹ H NMR spectrum of crystalline baricitinib Form M3.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M3. In one embodiment crystalline baricitinib Form M3 may be prepared by a process that includes the steps of:

a) suspending baricitinib in an organic solvent;

b) adding formic acid; and

c) isolating crystalline baricitinib Form M3.

According to this embodiment, baricitinib may be suspended in an organic solvent. Within the context of this embodiment, examples of suitable organic solvents include, but are not limited to, ethers, hydrocarbons, and mixtures thereof. Examples of suitable ethers include, but are not limited to, diethyl ether, tertiary butyl methyl ether, tetrahydrofuran, 1 ,4-dioxane, and mixtures thereof. Examples of suitable hydrocarbons include, but are not limited to, hexane, heptane, cyclohexane, cycloheptane, toluene, and mixtures thereof. In particularly useful embodiments the organic solvent is mixture of tertiary butyl methyl ether and heptane.

Next, formic acid may be added to the mixture and that mixture may be agitated. Within the context of the present embodiment, agitation may be carried out for at least 3 hours to facilitate formation of crystalline baricitinib Form M3. In some embodiments, the reaction mixture is agitated for an extended period of time, for example, about 3 or about 4 hours. Next, crystalline baricitinib form M3 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particular useful embodiments, the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or a washing and drying the solid. For example, in some embodiments, the solid is dried under vacuum to get crystalline baricitinib form M3. In some embodiments, the solid obtained is dried at about 30 °C under vacuum for about 1 hour to about 2 hours.

In another aspect, the present invention provides crystalline baricitinib Form M4. Within in the context of the present invention, crystalline baricitinib Form M4 may be characterized by a PXRD pattern having significant peaks at 20 angle positions of 1 0.96, 16.98, 20.15, 22.1 6, and 26.01 ± 0.2°. In another embodiment, crystalline baricitinib Form M4 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 10.04, 10.96, 12.06, 13.13, 14.75, 15.40, 16.35, 1 6.98, 17.23, 18.28, 20.15, 22.16, 22.94, 23.84, 24.26, 25.52, and 26.01 ± 0.2°. In yet another embodiment, crystalline baricitinib Form M4 may be characterized by a PXRD pattern having significant peaks at 20 angle positions of 10.04, 10.51 , 10.96, 12.06, 12.46, 13.13, 14.75, 15.40, 15.79, 16.35, 1 6.98, 17.23, 17.53, 18.28, 19.02, 20.15, 20.76, 21 .07, 22.16, 22.94, 23.84, 24.26, 24.60, 25.00, 25.52, 26.01 , 26.43, 26.90, 27.59, 27.94, 28.41 , 28.65, 29.37, 29.74, 30.42, 30.75, 31 .29, 31 .59, 31 .99, 32.75, 33.25, 34.02, 34.52, 34.79, 35.55, 36.44, 37.21 , 37.48, 38.55, 39.03, 39.67, 39.94, 40.67, 41 .38, 42.03, 43.39, 44.02, 44.45, 44.92, 45.25, 46.23, 46.37, 46.85, 47.59, 48.40, 48.94, and 49.70 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M4 is shown in Figure 7.

It is believed that crystalline baricitinib Form M4 is a formic acid solvate. More particularly, it is believed that the ratio of baricitinib to formic acid in Form M4 is 1 :1 . Figure 8 is a ¹ H NMR spectrum of crystalline baricitinib Form M4.

In another aspect, the present invention provides processes for the preparation of crystalline baricitinib Form M4. In one embodiment crystalline baricitinib Form M4 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in formic acid to form a solution;

b) adding the solution to an anti-solvent;

c) optionally seeding with crystalline baricitinib Form M4; and

d) isolating crystalline baricitinib Form M4.

According to this embodiment, baricitinib may be dissolved in formic acid to get a solution. Next, the baricitinib solution may be added to an anti-solvent. In some embodiments, this is done slowly. For example, in some embodiments, the baricitinib solution is added to an anti-solvent in a drop-wise manner.

Within the context of this embodiment, examples of suitable anti-solvents include, but are not limited to, ethers, hydrocarbons, or mixtures thereof. Examples of suitable ethers include, but are not limited to, diethyl ether, tertiary butyl methyl ether, tetrahydrofuran, 1 ,4-dioxane, and mixtures thereof. Examples of suitable hydrocarbons include, but are not limited to, hexane, heptane, cyclohexane, cycloheptane, toluene, and mixtures thereof. In particularly useful embodiments, the anti-solvent is mixture of tertiary butyl methyl ether and heptane.

Optionally, the resulting mixture may be seeded with crystalline baricitinib Form M4. This may, in some embodiments, facilitate formation of crystalline baricitinib form M4. Next, crystalline baricitinib form M4 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as (but not limited to), decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. One of skill in the art would be familiar with and recognize a variety of methods that may be used to isolate the solid. In particularly useful embodiments, the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or both. In some embodiments, the solid is washed with heptane. In some embodiments, the solid is further dried under vacuum to get crystalline baricitinib form M4. In some embodiments, the solid is dried at about 30 °C under vacuum for about 14 hours to about 16 hours. In another embodiment, crystalline baricitinib Form M4 may be prepared by a process that includes the following steps:

a) suspending crystalline baricitinib Form M3 in a hydrocarbon solvent; and

b) isolating crystalline baricitinib Form M4.

According to this embodiment, crystalline baricitinib Form M3 may be suspended in hydrocarbon. Examples of suitable hydrocarbons include, but are not limited to, hexane, heptane, cyclohexane, cycloheptane, toluene, and mixtures thereof. In particularly useful embodiments, baricitinib is suspended in heptane.

The resulting reaction mixture may then be agitated for an extended period of time to facilitate the conversion of the starting material to crystalline baricitinib Form M4. Within the context of the present embodiment, agitation may be carried out for at least 14 hours to facilitate formation of crystalline baricitinib Form M4. In some embodiments, the reaction mixture is stirred for about 14 hours to about 16 hours.

Next, crystalline baricitinib Form M4 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as (but not limited to), decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. One of skill in the art would be familiar with and recognize a variety of methods that may be used to isolate the solid. In particularly useful embodiments, the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or both. In some embodiments, the solid is washed with heptane. In some embodiments, the solid is further dried under vacuum to get crystalline baricitinib form M4. In some embodiments, the solid is dried at about 30 °C under vacuum for about 14 hours to about 16 hours.

In yet another embodiment, crystalline baricitinib Form M4 may be prepared by a process that includes the step of drying crystalline baricitinib Form M3 at 25 °C to about 35 °C under vacuum for 12 hours to about 1 6 hours. In another aspect, the present invention provides crystalline baricitinib Form M6. Within the context of the present invention, crystalline baricitinib Form M6 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 8.99, 17.24, 18.21 , and 20.28 ± 0.2°. In another embodiment, crystalline baricitinib Form M6 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 3.61 , 8.99, 1 1 .33, 12.34, 13.79, 17.24, 18.21 , 18.91 , and 20.28 ± 0.2°. In yet another embodiment, crystalline baricitinib Form M6 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 3.61 , 8.99, 1 1 .33, 12.34, 13.79, 14.98, 15.29, 16.06, 16.39, 1 7.24, 17.85, 18.21 , 18.91 , 19.95, 20.28, 21 .29, 21 .59, 22.92, 23.65, 23.87, 25.19, 25.51 , 26.28, 26.96, 27.55, 28.09, 28.80, 29.60, 30.76, 31 .49, 31 .79, 32.67, 33.48, 35.23, 36.25, 36.65, 38.05, 39.48, 40.59, 44.47, 45.84, 47.21 , 48.08, and 48.78 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M6 is shown in Figure 1 0.

It is believed that crystalline baricitinib Form M6 is a cyclopentyl methyl ether solvate. In particular, it is believed that the ratio of baricitinib to cyclopentyl methyl ether is baricitinib Form M6 is 1 :1 . Figure 1 1 is a ¹ H NMR spectrum of crystalline baricitinib Form M6. In another aspect, the present invention provides a process for the preparation of crystalline baricitinib Form M6. In one embodiment, crystalline baricitinib Form M6 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in aniline to form a solution;

b) adding cyclopentyl methyl ether to the solution; and

c) isolating crystalline baricitinib Form M6.

According to this embodiment, baricitinib may be dissolved in aniline. In some embodiments, a clear solution may be obtained.

Next, cyclopentyl methyl ether may be added to the solution. Within the context of this embodiment, cyclopentyl methyl ether may act as an anti-solvent and facilitate formation of crystalline baricitinib Form M6.

Crystalline baricitinib Form M6 may then be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. One of skill in the art would be familiar with and recognize a variety of methods that may be used to isolate the solid. In particularly useful embodiments, the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or both. In some embodiments, the solid is further dried to get crystalline baricitinib form M6. In some embodiments, the solid is dried at about 30 °C under vacuum for about 2 hours. In yet another embodiment, crystalline baricitinib Form M6 may be prepared by a process that includes the steps of:

a) suspending baricitinib in cyclopentyl methyl ether;

b) adding formic acid to step a); and

c) isolating crystalline baricitinib Form M6.

According to this embodiment, baricitinib may be added to cyclopentyl methyl ether to form a suspension. Next, formic acid may be added and the suspension may be agitated to result in the formation of crystalline baricitinib Form M6. In some embodiments, the suspension is agitated for 15 minutes. Next, crystalline baricitinib Form M6 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. One of skill in the art would be familiar with and recognize a variety of methods that may be used to isolate the solid. In particularly useful embodiments, the solid is isolated by filtration. After being obtained, the solid may be further treated, for example, by washing, drying, or both. In some embodiments, the solid is further dried under vacuum to get crystalline baricitinib form M6. In some embodiments, the solid is dried at about 30 °C under vacuum for about 1 hour to about 2 hours.

In another embodiment, the present invention provides crystalline baricitinib Form M7.

Within the context of the present invention, crystalline baricitinib Form M7 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 14.44, 19.79, 24.84, and 29.89 ± 0.2°. In another embodiment, crystalline baricitinib Form M7 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 5.04, 8.57, 10.78, 1 1 .54, 14.44, 15.42, 16.29, 17.72, 18.72, 19.79, 20.20, 21 .67, 22.82, 24.07, 24.84, 25.37, 26.10, 28.79, 29.18, and 29.89 ± 0.2°. In another embodiment, crystalline baricitinib Form M7 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 5.04, 8.57, 8.89, 9.94, 10.78, 1 1 .54, 14.44, 14.86, 15.42, 1 6.29, 16.68, 17.72, 1 8.35, 18.72, 19.41 , 19.79, 20.20, 20.57, 21 .67, 22.82, 23.10, 24.07, 24.40, 24.84, 25.37, 25.69, 26.10, 27.00, 28.09, 28.33, 28.79, 29.18, 29.89, 30.98, 31 .61 , 32.68, 33.30, 34.10, 34.67, 35.00, 37.98, 38.68, 40.18, 41 .08, 42.36, 43.06, 44.32, 44.88, 46.07, 47.49, 48.30, and 49.73 ± 0.2°.

A representative PXRD pattern of crystalline baricitinib Form M7 is shown in Figure 12.

In yet another aspect, the present invention provides a process for preparing crystalline baricitinib Form M7. In one embodiment, crystalline baricitinib Form M7 may be prepared by a process that includes the steps of:

a) dissolving baricitinib in aniline; b) adding anti-solvent to the solution obtained in step a); and

c) isolating crystalline baricitinib Form M7.

According to this embodiment, baricitinib may be dissolved in aniline to get a solution. Within the context of this embodiment, dissolution of baricitinib in aniline may be carried out at an elevated temperature. For example, in some embodiments, baricitinib is dissolved in aniline at a temperature of about 20 °C to about 50 °C.

Within the context of this embodiment, the anti-solvent employed may be an ether. For example, the ether may be diethyl ether, tertiary butyl methyl ether, isopropyl ether, tetrahydrofuran, 1 ,4-dioxane, or mixtures thereof. In particularly useful embodiments, the anti-solvent is isopropyl ether.

Next, crystalline baricitinib Form M7 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, or any combination thereof. One of skill in the art would be familiar with and recognize a variety of methods that may be used to isolate the solid. In particularly useful embodiments, the solid is isolated by filtration.

After being obtained, the solid may be further treated, for example, by washing, drying, or both. In some embodiments, the solid is further dried under vacuum to get crystalline baricitinib form M7. In some embodiments, the solid is dried at about 30 °C under vacuum for about 1 hour to about 2 hours.

It is believed that crystalline baricitinib Form M7 is an aniline solvate. In particular, it is believed that the ratio of baricitinib to aniline in baricitinib Form M7 is 1 :1 .5. Figure 13 is a ¹ H NMR spectrum of crystalline baricitinib Form M7. In another aspect, the present invention provides crystalline baricitinib Form M5.

Within the context of the present invention, crystalline baricitinib Form M5 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 14.86, 16.17, 16.37, 1 8.74, and 25.47 ± 0.2°. In another embodiment, crystalline baricitinib Form M5 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 4.01 , 12.34, 13.87, 14.86, 15.39, 16.17, 16.37, 17.26, 18.74, 19.89, 20.55, 21 .37, 22.37, 23.54, 24.62, 25.09, and 25.47 ± 0.2°. In yet another embodiment, crystalline baricitinib Form M5 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 4.01 , 12.34, 12.61 , 13.87, 14.54, 14.86, 15.39, 16.17, 16.37, 17.26, 18.54, 18.74, 19.18, 19.89, 20.55, 21 .37, 22.37, 23.54, 24.62, 25.09, 25.47, 26.29, 27.15, 27.66, 29.93, 30.65, 33.23, 33.98, 35.06, 37.19, 39.63, 39.81 , 41 .85, 43.02, 44.22, and 48.64 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M5 is shown in Figure 9.

In another aspect, the present invention provides a process for preparing crystalline baricitinib Form M5. Another embodiment of the present disclosure is to provide a process for the preparation of crystalline baricitinib Form M5 that includes the step of drying crystalline baricitinib Form M3, Form M1 , Form M2, Form M4, Form M6, Form M7 at a temperature of about 130 °C to about 200 °C

It is believed that crystalline baricitinib Form M5 is unsolvated.

In another aspect, the present invention provides crystalline baricitinib Form M8. Within the context of the present invention, crystalline baricitinib Form M8 may be characterized by a powder X-ray diffraction pattern having significant peaks at 2Θ angle positions of 16.52, 19.00, and 21 .78 ± 0.2°. In some embodiments, crystalline baricitinib Form M8 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 5.46, 10.87, 14.38, 16.52, 18.22, 19.00, 20.53, 21 .26, and 21 .78 ± 0.2°. A representative PXRD pattern of crystalline baricitinib Form M8 is shown in Figure 14.

In one embodiment crystalline baricitinib Form M8 may be prepared by a process that includes drying crystalline baricitinib Form M4 or Form M6 at a temperature of 200 °C to about 230 °C.

In another embodiment, crystalline baricitinib Form M8 may be prepared by a process that includes the steps of:

a) dissolving crystalline baricitinib hydrochloride in a solvent;

d) isolating crystalline baricitinib Form M8.

According to this embodiment, crystalline baricitinib hydrochloride may be dissolved in a solvent to form a solution. Within the context of this embodiment, the crystalline baricitinib starting material may be crystalline baricitinib hydrochloride Form M1 , crystalline baricitinib hydrochloride Form M2, crystalline baricitinib hydrochloride Form M3, or mixtures thereof. Examples of suitable solvents include polar protic solvents. Examples of polar protic solvents include, but are not limited to, water, methanol, ethanol, isopropanol, and mixtures thereof. In some embodiments, water is used as a solvent. In some embodiments, dissolving baricitinib in the solvent is carried out at an elevated temperature. For example, in some embodiments, baricitinib is dissolved in a first solvent at a temperature of about 60 °C to about 70 °C.

Next, the solution may be added to a mixture of hydroxyl propyl methyl cellulose solution, crystalline baricitinib Form M8 seeds and alkaline solution. This step may be carried out at ambient temperature, for example, at about 25°C to about 30°C. In some embodiments, it is found that adjusting the temperature to about 20°C to about 35°C and stirring for about 30 minutes to about 1 hour is particularly useful.

Within the context of this embodiment, the alkaline solution may be an aqueous sodium hydroxide solution, an aqueous sodium carbonate solution, an aqueous sodium bicarbonate solution, an aqueous potassium hydroxide solution, an aqueous potassium carbonate solution, an aqueous potassium bicarbonate solution, or mixtures thereof.

Next, the first solution containing baricitinib may be added to the mixture to form a reaction mass, which may then be agitated. In some embodiments, the reaction mass is stirred. Next, crystalline baricitinib Form M8 may be isolated. Within the context of this embodiment of the present invention, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particular useful embodiments of the present invention the solid is isolated by filtration followed by washing and drying. After being obtained, the solid may be further treated, for example, by drying under vacuum to get crystalline baricitinib hydrochloride Form M8. In some embodiments, the solid obtained is dried at about 40 °C to about 50 °C under vacuum.

a) dissolving baricitinib in a solvent to form a solution;

c) isolating crystalline baricitinib Form M8. According to this embodiment, crystalline baricitinib hydrochloride may be dissolved in a solvent to get a solution.

Within the context of this embodiment, the solvent may be water, a water-miscible solvent, or a mixture thereof. Examples of suitable water-miscible solvents include, but are not limited to, diglyme (diethylene glycol dimethyl ether), 1 ,2-dimethoxyethane, dimethyl formamide, 1 ,4-dioxane, dimethyl sulfoxide, and mixtures thereof. In some embodiments, a mixture of water and 1 ,2-dimethoxyethane is used a solvent.

In some embodiments, the dissolving may be carried out at an elevated temperature. For example, in some embodiments, baricitinib is dissolved in a solvent at a temperature of about 60 °C to about 70 °C.

Next, the solution may be added to a mixture of crystalline baricitinib Form M8 seeds, water and optionally hydroxyl propyl methyl cellulose. This step may be carried out at ambient temperature, for example, at about 25°C to about 30°C.

Next, crystalline baricitinib Form M8 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particular useful embodiments of the present invention the solid is isolated by filtration followed by washing and drying.

After being obtained, the solid may be further treated, for example, by washing, drying, or both. For example, the in some embodiments, the solid is dried under vacuum to get crystalline baricitinib hydrochloride Form M8. In some embodiments, the solid is dried under vacuum for 10 hours at 50 °C.

In another aspect, the present invention provides crystalline forms of baricitinib hydrochloride and processes for their preparation.

In one aspect, the present invention provides crystalline baricitinib hydrochloride Form M1 . Within the context of the present invention, crystalline baricitinib hydrochloride Form M1 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 9.73, 10.53, 1 6.52, 19.67, 20.18, 21 .52, and 24.04 ± 0.2°. In another embodiment, crystalline baricitinib hydrochloride Form M1 may be characterized by a PXRD pattern having significant peaks at 2Θ angle positions of 9.73, 9.95, 10.53, 1 1 .99, 12.51 , 14.29, 15.02, 16.52, 17.94, 18.38, 1 9.67, 20.1 8, 21 .52, 22.33, 22.79, 24.04, 25.47, 26.08, 26.30, 27.74, 28.85, 29.42, 30.14, 30.79, 31 .25, 31 .96, 33.97, 34.96, 35.62, 37.83, 41 .47, 42.69, 45.95, 47.04, 47.46, and 48.26 ± 0.2°. A representative PXRD pattern of crystalline baricitinib hydrochloride Form M1 is shown in Figure 15.

In another aspect, the present invention provides a process for the preparation of crystalline baricitinib hydrochloride Form M1 . In one embodiment crystalline baricitinib hydrochloride Form M1 may be prepared by a process that includes the steps of:

a) suspending baricitinib in a solvent;

b) adding hydrochloride to the above suspension; c) stirring the reaction mass to form the precipitation; and

d) isolating crystalline baricitinib hydrochloride Form M1 .

According to this embodiment, baricitinib may be suspended in a solvent.

Within the context of this embodiment of the present invention, the solvent employed may include, polar protic solvents such as methanol, ethanol, isopropanol, water or mixtures thereof. In particular, useful embodiments of the present invention solvent is water.

Next, hydrochloride was added and the reaction mass may be maintained under stirring for about 30 minutes to about 60 minutes.

Next, crystalline baricitinib hydrochloride Form M1 may be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particularly useful embodiments, the solid is isolated by filtration followed by washing and drying.

After being obtained, the solid may be further treated, for example, by washing, drying, or a combination of both. For example, in some embodiments, the solid is dried under vacuum to get crystalline baricitinib hydrochloride Form M1 . In some embodiments, the solid obtained is dried at about 35 °C to about 45 °C under vacuum for about 3 hours to about 4 hours.

In another aspect, the present invention provides crystalline baricitinib hydrochloride Form M2.

Within the context of the present invention, crystalline baricitinib hydrochloride Form M2 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 5.34, 9.02, 1 1 .65, 17.82, 20.14, and 28.83 ± 0.2°. In another embodiment, crystalline baricitinib hydrochloride Form M2 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 5.34, 9.02, 10.71 , 1 1 .65, 12.83, 15.51 , 1 7.82, 19.1 1 , 20.14, 23.46, 24.60, 27.22, 28.14, 28.83, 29.36, 30.35, 32.38, 37.52, 38.41 , 40.42, 42.58, 43.63, 45.36, 46.38 and 47.94 ± 0.2°. A representative PXRD pattern of crystalline baricitinib hydrochloride Form M2 is shown in Figure 16. In another aspect, the present invention provides a process for the preparation of crystalline baricitinib hydrochloride Form M2.

In one embodiment crystalline baricitinib hydrochloride Form M2 may be prepared by a process that includes the steps of:

a) suspending baricitinib in alcohol;

b) adding alcoholic hydrochloride to the above suspension;

c) stirring and filtering the reaction mass; and

d) drying the solid obtained in step (c) under vacuum at 50°C for 10 hours to get crystalline baricitinib hydrochloride salt Form M2. According to this embodiment, baricitinib may be suspended in an alcohol. Within the context of this embodiment of the present invention, examples of suitable alcohols include methanol, ethanol, isopropanol, n-butanol, and mixtures thereof. In particularly useful embodiments, baricitinib is suspended in methanol. Next, an alcoholic hydrochloride may be added. Examples of suitable alcoholic hydrochlorides include, but are not limited to, methanolic hydrochloride, ethanolic hydrochloride, isopropanol hydrochloride, and mixtures thereof.

Next, the reaction mixture may be agitated. For example, in some embodiments, the reaction mixture is stirred for about 1 hour to about 2 hours. Crystalline baricitinib hydrochloride Form M2 may then be isolated. Within the context of this embodiment, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof. In particularly useful embodiments, the solid is isolated by filtration followed by drying.

In some embodiments the solid is dried under vacuum to get crystalline baricitinib hydrochloride Form M2. In some embodiments, the solid obtained was dried at about 45 °C to about 55°C under vacuum for about 9 to about 10 hours. In particular embodiments, the solid is dried at 50 °C for 10 hours.

In another aspect, the present invention provides crystalline baricitinib hydrochloride Form M3.

Within the context of the present invention, crystalline baricitinib hydrochloride Form M3 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 1 1 .47, 17.62, 19.94, 23.26, 24.36, 27.07, 28.62, 29.30, and 40.66 ± 0.2°. In another embodiment, crystalline baricitinib hydrochloride Form M3 may be characterized by a PXRD pattern having significant peaks at 2Θ angles of 1 1 .20, 1 1 .47, 17.62, 1 9.94, 21 .44, 22.55, 23.26, 24.36, 27.07, 28.04, 28.62, 29.30, 30.15, 31 .37, 32.21 , 33.13, 36.21 , 37.35, 39.30, 40.1 1 , 42.59, 44.38, 46.27, 47.84, and 48.26 ± 0.2°. A representative PXRD pattern of crystalline baricitinib hydrochloride Form M3 is shown in Figure 17. In another aspect, the present invention provides a process for the preparation of crystalline baricitinib hydrochloride Form M3.

In one embodiment crystalline baricitinib hydrochloride Form M3 may be prepared by a process that includes the steps of:

a) suspending baricitinib in alcohol;

b) adding alcoholic hydrochloride to the above suspension;

c) stirring and filtering the reaction mass; and

d) drying the solid obtained in step (c) under vacuum at 50°C for 12 hours to get crystalline baricitinib hydrochloride Form M3. According to this embodiment, baricitinib may be suspended in an alcohol.

Within the context of this embodiment, the alcohol may be methanol, ethanol, isopropanol, n-butanol, or mixtures thereof. In particularly useful embodiments baricitinib is suspended in methanol. Next, an alcoholic hydrochloride may be added. Within the context of this embodiment, the alcoholic hydrochloride may be, for example, methanolic hydrochloride, ethanolic hydrochloride, isopropanol hydrochloride, and mixtures thereof.

The reaction mixture may then be agitated to facilitate formation of a solid. For example, in some embodiments, the reaction mixture is stirred for about 1 hour to about 2 hours. Next, crystalline baricitinib hydrochloride Form M3 may be isolated. Within the context of this embodiment of the present invention, isolation can be done using any techniques in the art such as decantation, filtration by gravity or suction, centrifugation, slow evaporation, distillation, or any combination thereof.

After being obtained, the solid may be further treated, for example, by drying under vacuum to get crystalline baricitinib hydrochloride Form M3. In some embodiments, the solid obtained is dried at about 45 °C to about 55 °C under vacuum for about 12 hours to about 13 hours. In particularly useful embodiments, the solid is dried under vacuum at 50 °C for 12 hours.

Within the context of any embodiment disclosed herein that employs baricitinib as a starting material, said baricitinib may be crystalline, amorphous, or semi-crystalline in nature unless indicated otherwise, and may be prepared by any process, for example, the processes disclosed in U.S. Patent No. 8,158,616.

As a summary, Table 1 below lists the solvents that may be used to prepare the novel crystalline forms disclosed herein. Table 1

Some crystalline forms of baricitinib disclosed herein may exhibit enhanced stability during storage. Thus, the stability of samples of crystalline baricitinib Form M1 , Form M2, Form M4, and Form M8 were stored at 40 °C/75% relative humidity (RH) and at 25 °C/60% relative humidity (RH) for 6 months. The samples were analyzed by PXRD for polymorph integrity.

Results of this testing revealed that crystalline baricitinib Form M1 , Form M2 and Form M8 shows no change in PXRD pattern when stored for 6 months at 40 °C/75% relative humidity (RH) and at 25 °C/60% relative humidity (RH) conditions. Crystalline baricitinib Form M4 also shows no change in PXRD pattern when stored for 2 months at 40 °C/75% relative humidity (RH) and at 25 °C/60% relative humidity (RH) conditions. These results are shown in Table 2 below.

Table 2

Crystalline baricitinib and baricitinib hydrochloride, in any of the forms disclosed herein, may be useful in the treatment of rheumatoid arthritis and may be incorporated into dosage forms for the administration to patients suffering therefrom.

For example, baricitinib or baricitinib hydrochloride may be formulated into an oral dosage form, for example, a tablet or capsule. In addition to the baricitinib active (or baricitinib hydrochloride), tablets or capsules may contain other pharmaceutically acceptable excipient ingredients including, but not limited to, microcrystalline cellulose, croscarmellose sodium, magnesium stearate, mannitol, lecithin, macrogol, polyvinyl alcohol, talc, titanium dioxide, and artificial flavorings and colors (e.g., iron oxide red).

In particular embodiments, tablets or capsules may be formulated such that they each contain about 2 mg to about 4 mg of baricitinib (or amount of baricitinib hydrochloride equivalent to 2 mg to 4 mg of baricitinib)

Certain specific aspects and embodiments of the present application will be explained in greater detail with reference to the following examples, which are provided only for purposes of illustration and should not be construed as limiting the scope of the disclosure in any manner. Reasonable variations of the described procedures are intended to be within the scope of the present application. While particular aspects of the present application have been illustrated and described, it would be apparent to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the disclosure. It is therefore intended to encompass all such changes and modifications that are within the scope of this disclosure.

EXAMPLES Example 1 : Preparation of crystalline baricitinib Form M1.

Baricitinib (2 g) was dissolved in sulfolane (16 mL) at 80 °C. The solution was filtered to remove any undissolved particulate. The clear solution was gradually cooled to 25-30 °C and maintained under stirring at 25-30 °C for 1 hour with agitation. Toluene (30 mL) was added into the reaction mixture and maintained under stirring at 25-30 °C for 30 minutes. The product obtained was filtered, washed with toluene (10 mL), and dried at 50 °C under vacuum for 48 hours to yield crystalline form M1 of baricitinib.

Yield: 1 .9 g

Example 2: Preparation of crystalline baricitinib Form M1.

Baricitinib (0.1 g) was dissolved in sulfolane (0.5 mL) at 60 °C. The clear solution was gradually cooled to 25-30 °C and water (2 mL) was added into the reaction mixture and maintained under stirring at 25-30 °C for 1 6 hours. The product obtained was filtered, washed with water (1 0 mL), and dried at 50 °C under vacuum for 24 hours to yield crystalline form M1 of baricitinib.

Yield: 0.1 1 g

Example 3: Preparation of crystalline baricitinib Form M2.

Baricitinib (2 g) was suspended in propanoic acid (1 0 mL) at 30 °C and maintained under agitation for 1 hour. The slurry was filtered and obtained solid was dried at 30 °C for 16 hours to yield crystalline form M2 of baricitinib.

Yield: 1 .8 g Example 4: Preparation of crystalline baricitinib Form M2.

Baricitinib (5 g) was suspended in propanoic acid (25 mL) at 30 °C and maintained under agitation for 16 hours. The slurry was filtered and obtained solid washed with heptane (25 mL) and dried at 50 °C under vacuum for 24 hours to yield crystalline form M2 of baricitinib. Yield: 4.9 g

Example 5: Preparation of crystalline baricitinib Form M3.

Baricitinib (5 g) was suspended in tertiary butyl methyl ether (50 mL) and heptane (50 mL) at 25-30 °C and maintained under agitation for 15 minutes. Formic acid (5mL) was added and maintained under agitation for 4 hours. The reaction mass was filtered and solid obtained was dried at 30 °C under vacuum for 1 hour to yield crystalline Form M3 of baricitinib.

Yield: 5.45 g

Example 6: Preparation of crystalline baricitinib Form M4.

Baricitinib (1 g) was suspended in mixture of tertiary butyl methyl ether (30 mL) and heptane (30 mL) at 25-30 °C and maintained under agitation for 1 5 minutes. To the resulting suspension, formic acid (1 mL) was added and maintained under agitation for 24 hours. The reaction mass was filtered and solid obtained was dried at 30 °C under vacuum for 16 hours to yield crystalline Form M4 of baricitinib.

Yield: 0.94 g

Example 7: Preparation of crystalline baricitinib Form M4.

Baricitinib (2 g) was dissolved in formic acid (2mL) at 25-30 °C. Filter the solution through Hyflo to remove any undissolved particulate. The clear solution was added dropwise to the mixture of tertiary butyl methyl ether (30 mL), heptane (30mL) and seeds of form M4 (1 % w/w) at 25-30 °C. The hazy solution was maintained under stirring at 25-30 °C for 4hours. The obtained product was filtered and wet sample was slurred in heptane (40 mL) for 1 6 hours. The reaction mass was filtered, washed with heptane (4 mL) and dried at 30 °C under vacuum for 16 hours to yield crystalline Form M4 of baricitinib.

Yield: 1 .9 g

Example 8: Preparation of crystalline baricitinib Form M4.

Baricitinib (0.5 g) form M3 obtained as above was slurried in heptane (1 0 mL) for 16 hours. The product obtained was filtered, washed with heptane (2mL), and dried at 30 °C under vacuum for 16 hours to yield crystalline Form M4 of baricitinib.

Example 9: Preparation of crystalline baricitinib Form M5. Baricitinib (0.1 g) form M3 was heated from 30-230 °C using variable temperature powder XRD tool on Bruker D8 X-Ray Diffractometer. We observed that above 130 °C, form M3 converted to a different crystalline arrangement which remained stable as the temperature was increased up to 200 °C. The resulting crystalline form was identified as crystalline baricitinib Form M5. Example 10: Preparation of crystalline baricitinib Form M6.

Baricitinib (0.5 g) was suspended in cyclopentyl methyl ether (CPME, 8 mL) at 25-30 °C and maintained under agitation for 15 minutes. Formic acid (55μί) was added and the resulting mixture was maintained under agitation for 1 hour. The resulting suspension was filtered, washed with CPME (1 mL) and the obtained solid was dried at 30 °C under vacuum for 2 hours to yield crystalline form M6 of baricitinib.

Yield: 0.41 g

Example 11 : Preparation of crystalline baricitinib Form M6.

Baricitinib (5 g) was suspended in cyclopentyl methyl ether (50 mL) at 25-30 °C and maintained under agitation for 15 minutes. To the resulting suspension, formic acid (1 mL) was added and maintained under agitation for 12 hours. The reaction mass was filtered, washed with cyclopentyl methyl ether (15 mL), and the obtained solid was dried at 30 °C under vacuum for 2 hours to yield crystalline form M6 of baricitinib.

Yield: 5.5 g

Example 12: Preparation of crystalline baricitinib Form M6.

Baricitinib (0.5 g) was dissolved in aniline (2.5 mL) at 25-30 °C to obtain a clear solution. Cyclopentyl methyl ether (1 0 mL) was added and the mixture was maintained under stirring at 25-30 °C for 30 minutes. The solution was filtered and the solid obtained was suction-dried to yield crystalline form M6 of baricitinib.

Yield: 0.42 g Example 13: Preparation of crystalline baricitinib Form M7.

Baricitinib (0.5 g) was dissolved in aniline (2.5 mL) at 25-30 °C to obtain a clear solution. Isopropyl ether (10 mL) was added slowly and the reaction mixture was maintained under stirring at 25-30 °C for 30 minutes. The solution was filtered and the solid obtained was suction-dried to yield crystalline form M7 of baricitinib. Yield: 0.42 g

Example 14: Preparation of crystalline baricitinib Form M7.

Baricitinib (2 g) was dissolved in aniline (10 mL) at 50 °C. The solution was filtered through Hyflo to remove any undissolved particulate. The clear solution was gradually cooled to 25-30 °C and maintained under stirring at 25-30 °C for 1 hour. Then, tertiary butyl methyl ether (30 mL) was added into the reaction mixture and maintained under stirring at 25-30 °C for 2 hours. The solution was filtered and the solid obtained was washed with tertiary butyl methyl ether (10 mL) then dried at 30 °C under vacuum for 2 hours to yield crystalline form M7 of baricitinib. Yield: 1 .92 g.

Example 15: Preparation of crystalline baricitinib Form M5.

Baricitinib Form M1 (0.1 g) was heated from 30-230 °C using a variable temperature powder XRD tool on a Bruker D8 X-Ray Diffractometer. We observed that above 190 °C, Form M1 converted to a different crystalline form which remained stable as the temperature was increased to 200 °C. The converted crystalline form was identified as crystalline baricitinib Form M5.

Example 16: Preparation of crystalline baricitinib Form M5.

Baricitinib Form M2 (0.1 g) was heated from 30-230 °C using a variable temperature powder XRD tool on a Bruker D8 X-Ray Diffractometer. We observed that above 150 °C, Form M2 converted to a different crystalline form which remained stable as the temperature was increased to 200 °C. The resulting high temperature phase was identified as crystalline baricitinib Form M5.

Example 17: Preparation of crystalline baricitinib Form M5.

Baricitinib Form M4 (0.1 g) was heated from 30-230 °C using a variable temperature powder XRD tool on a Bruker D8 X-Ray Diffractometer. We observed that above 1 1 0 °C, Form M4 converted to different crystalline form which remained stable as the temperature was increased to 200 °C. The resulting crystalline form was identified as crystalline baricitinib Form M5.

Example 18: Preparation of crystalline baricitinib Form M5.

Baricitinib Form M6 (0.1 g) was heated from 30-230 °C using a variable temperature powder XRD tool on a Bruker D8 X-Ray Diffractometer. We observed that above 1 1 0 °C, Form M6 converted to different crystalline form, which remained stable as the temperature was increased to 200 °C. The resulting crystalline form was identified as crystalline baricitinib Form M5.

Example 19: Preparation of crystalline baricitinib Form M8.

Crystalline baricitinib Form M4 (100 mg) was heated to 200-230 °C, followed by slowly cooling to 25- 30 °C. The solid obtained was identified as crystalline baricitinib Form M8.

Example 20: Preparation of crystalline baricitinib Form M8.

The crystalline baricitinib Form M6 (100 mg) was heated to 200-230 °C, followed by slowly cooling to 25-30 °C. The solid obtained was identified as crystalline baricitinib Form M8. Example 21 : Preparation of crystalline baricitinib hydrochloride Form M1 .

Baricitinib (5 g) was suspended in water (50 mL) at 25 ± 5 °C. Concentrated HCI (2 mL) was added slowly over 10-15 minutes, maintaining the temperature at 25 ± 5 °C. The reaction mass was maintained under stirring for 30-60 minutes at 25 ± 5 °C. The reaction mass was then filtered and the resulting solid was dried under vacuum at 40 °C for 4 hours. The solid obtained was identified as crystalline Form M1 of baricitinib hydrochloride.

Yield: 5 g

Example 22: Preparation of crystalline baricitinib hydrochloride Form M2.

Baricitinib (18 g) was suspended in methanol (270 mL) at 25 ± 5 °C and cooled to 20 ± 2 °C. Methanolic HCI (54 mL) was slowly added over 30 min at 20 ± 2 °C, after which the reaction mixture was maintained under stirring for 2 hours at 20 ± 2 °C. The reaction mass was filtered and the solid was suck-dried for 30 minutes followed by drying under vacuum at 50 °C for 10 hours. The solid obtained was identified as crystalline Form M2 of baricitinib hydrochloride.

Yield: 19g Example 23: Preparation of crystalline baricitinib hydrochloride Form M3.

Baricitinib (5 g) was suspended in methanol (75 mL) at 25 ± 5 °C then cooled to 20 ± 2 °C. Methanolic HCI (15 mL) was slowly added over 30 minutes at 20 ± 2 °C. The reaction mass was maintained under stirring for 2 hours at 20 ± 2 °C then filtered. The solid was suck-dried for 30 minutes and dried under vacuum at 50 °C for 12 hours. The solid obtained was identified as crystalline Form M3 of baricitinib hydrochloride.

Yield: 6g

Example 24: Preparation of crystalline baricitinib Form M8.

Baricitinib (8 g) was dissolved in a mixture of 1 , 2 dimethoxy ethane (80 mL) and water (24 mL) at 65 ± 5 °C to form a clear solution. The solution was then filtered through a 0.45micron filter and added slowly over 45 min to water (96 mL) seeded with baricitinib Form M8 at 24-26 °C. The mixture was maintained under stirring for 30 minutes at 24-26 °C. The reaction mass was slowly cooled to 5 ± 2 °C over 2 hours and maintained under stirring for 60 minutes at 5 ± 2 °C. The reaction mass was filtered and the solid was washed with water (16 mL), suck-dried under vacuum for 30 minutes, and dried under vacuum at 70 °C for 15 hours. The solid obtained was identified as crystalline baricitinib Form M8.

Yield: 6.0 g

Example 25: Preparation of crystalline baricitinib Form M8. Baricitinib (0.8 g) was dissolved in a mixture of 1 ,2-dimethoxy ethane (1 0 mL) and water (1 .2 mL) at 65 ± 5 °C to form a clear solution. The solution was filtered through a 0.45 micron filter then added over 10 minutes to a mixture of hydroxypropyl methyl cellulose (HPMC-E6) in water (prepared by dissolving 1 g of HPMC-E6 in 20 mL of water at 25 °C) seeded with baricitinib Form M8 (20 mg) at 25 ± 5 °C. The mixture was filtered, and the obtained solid was suck-dried under vacuum for 30 minutes. The solid obtained was identified as crystalline Form M8 of baricitinib.

Yield: 0.6g

Example 26: Preparation of crystalline baricitinib Form M8.

Baricitinib (2.5 g) was dissolved in dimethyl sulfoxide (10 mL) 25 ± 5 °C to form a clear solution. The solution was filtered through a 0.45 micron filter and added to a mixture of hydroxypropyl methylcellulose (HPMC-E6) in water (prepared by dissolving 1 g of HPMC-E6 in 25 mL of water at 25 °C for 10-15 minutes at 25 ± 5 °C) seeded with baricitinib Form M8 (20 mg). The reaction mass was stirred for 10 minutes at 25-30 °C then filtered. The solid was suck-dried under vacuum for 10 minutes. The solid obtained was identified as crystalline Form M8 of baricitinib. Yield: 2.0 g

Example 27: Preparation of crystalline baricitinib Form M8.

Baricitinib hydrochloride Form M1 (2 g) was dissolved in water (50 mL) at 65 ± 5 °C. The solution was filtered through Hyflo to remove any undissolved particulates. The Hyflo bed was washed with water (10 mL). The resulting clear solution was heated to 65 ± 5 °C. Separately, 0.4 g of HPMC-E6 was dissolved in 20 mL of water at 25 ± 5 °C to which seeds of baricitinib Form M8 seeds (40 mg) and a NaHCCb solution (0.5 g of NaHCCb in 10 mL of water) was added. The heated baricitinib hydrochloride solution was then added to the seeded HPMC-E6/NaHC03 solution over 45 minutes, maintaining the temperature at 26 ± 2 °C. The reaction mass was maintained under stirring for 30 minutes at 26 ± 2 °C. The reaction mass was then filtered and the isolated solid was dried under vacuum at 40 °C for 3 hours. The solid obtained was identified as crystalline Form M8 of baricitinib Form M8.

Yield: 1 .3g

Example 28: Preparation of crystalline baricitinib Form M8.

Baricitinib hydrochloride Form M2 (2.5 g) was dissolved in water (50 mL) at 65 ± 5 °C. The solution was then filtered through Hyflo to remove any undissolved particulates. The Hyflo bed was then washed with water (10 mL). The resulting clear solution was heated to 65 ± 5 °C. Separately, 2.5 g of HPMC-E6 was dissolved in 100 mL of water at 25 ± 5 °C, to which seeds of baricitinib Form M8 (25 mg) and a NaHCCb solution (1 .25 g of NaHCCb dissolved in 50 mL of water) was added. The heated baricitinib hydrochloride solution was then added to the aqueous seeded HPMC-E6 over 1 0 minutes, maintaining the temperature at 20 ± 2 °C. The reaction mass was maintained under stirring for 1 hour at 26 ± 2 °C after which the mixture was filtered and the solid washed with water (10 mL) then dried under vacuum at 50 °C for 12 hours. The dry solid was added to water (12.5 mL) at 25 ± 5 °C and maintained under stirring for 1 hour at 25 ± 5 °C. The mixture was filtered and dried under vacuum at 50 °C for 10 hours. The solid obtained was identified as crystalline Form M8 of baricitinib. Yield: 1 .3g

Example 29: Preparation of crystalline baricitinib Form M8.

Baricitinib hydrochloride Form M3 (0.5 g) was dissolved in water (15 mL) at 65 ± 5 °C then filtered through Hyflo to remove any undissolved particulates. The resulting clear solution was heated to 65 ± 5 °C. Separately, 0.5 g of HPMC-E6 was dissolved in 1 0 mL of water at 25 ± 5 °C to which seeds of baricitinib Form M8 (25 mg) and a NaHC03 solution (250 mg of NaHCCb dissolved in 5 mL of water) was added. The heated baricitinib solution was then added to the seeded aqueous HPMC-E6 solution over 10 minutes, maintaining the temperature at 20 ± 2 °C. The reaction mass was stirred for 1 hour at 20 ± 2 °C then filtered. The solid was washed with water (2 mL) and dried under vacuum at 50 °C for 12 hours. The dry solid was added into water (12.5 mL) at 25 ± 5 °C and maintained under stirring for 1 hour at 25 ± 5 °C. The mixture was filtered and the solid was dried under vacuum at 50 °C for 10 hours. The solid obtained was identified as crystalline Form M8 of baricitinib.

Yield: 0.4 g

Claims

We claim:

1 . Crystalline baricitinib Form M1 .

2. The crystalline baricitinib Form M1 of claim 1 , characterized by a PXRD pattern having significant peaks at 20 angles of 10.56, 14.72, 18.1 1 , and 20.62 ± 0.2°.

3. The crystalline baricitinib Form M1 of claim 1 , characterized by a PXRD pattern as shown in Figure 1 .

4. A process for the preparation of crystalline baricitinib Form M1 , comprising the steps of: a. dissolving baricitinib in sulfolane to form a solution;

b. adding an anti-solvent to the solution; and

c. isolating crystalline baricitinib Form M1 .

5. The process as claimed in claim 4, wherein the anti-solvent is selected from the group consisting of water, hydrocarbons, and mixtures thereof.

6. The process as in claim 5, wherein the hydrocarbon is selected from the group consisting of toluene, heptane, and mixtures thereof.

7. Crystalline baricitinib Form M2.

8. The crystalline baricitinib Form M2 as in claim 7, characterized by a PXRD pattern having significant peaks at 2Θ angles of 7.22, 10.91 , 1 1.85, 14.40, and 22.12 ± 0.2°.

9. The crystalline baricitinib Form M2 in claim 7, characterized by a PXRD pattern as shown in Figure 3.

10. A process for the preparation of crystalline baricitinib Form M2, comprising the steps of: a. providing baricitinib in propanoic acid; and

b. isolating crystalline baricitinib Form M2.

1 1 . Crystalline baricitinib Form M4.

12. The crystalline baricitinib Form M4 as in claim 1 1 , characterized by a PXRD pattern having significant peaks at 2Θ angles of 10.96, 16.98, 20.15, 22.16, and 26.01 ± 0.2°.

13. The crystalline baricitinib Form M4 as in claim 1 1 , characterized by a PXRD pattern as shown in Figure 7.

14. A process for the preparation of crystalline baricitinib Form M4, comprising the steps of: a. dissolving baricitinib in formic acid to form a solution;

b. adding the solution to an anti-solvent;

c. optionally seeding with crystalline baricitinib Form M4; and

d. isolating crystalline baricitinib Form M4.

15. The process as claimed in claim 13, wherein the anti-solvent is selected from the group consisting of diethyl ether, tertiary butyl methyl ether, tetrahydrofuran, 1 ,4-dioxane, hexane, heptane, cyclohexane, cycloheptane, toluene, and mixtures thereof.

16. A process for the preparation of crystalline baricitinib Form M4, comprising the steps of: a. suspending crystalline baricitinib Form M3 in a hydrocarbon solvent; and

b. isolating crystalline baricitinib Form M4.

17. The process as claimed in claim 16, wherein the hydrocarbon is selected from the group consisting of hexane, heptane, cyclohexane, cycloheptane, toluene, and mixtures thereof.

18. Crystalline baricitinib Form M8.

19. The crystalline baricitinib Form M8 in claim 18, characterized by a PXRD pattern having significant peaks at 2Θ angles of 16.52, 19.00, and 21 .78 ± 0.2°.

20. The crystalline baricitinib Form M8 as claimed in claim 18, characterized by a PXRD pattern as shown in Figure 14.

21 . A process for the preparation of crystalline baricitinib Form M8, comprising the steps of: a. dissolving crystalline baricitinib hydrochloride in a solvent; b. adding the solution obtained in step (a) to a mixture containing of hydroxyl propyl methyl cellulose solution, crystalline baricitinib Form M8 seeds and alkaline solution; c. stirring the reaction mass to form the precipitation; and

d. isolating crystalline baricitinib Form M8.

22. The process as claimed in claim 21 , wherein the solvent is selected from the group consisting of water, methanol, ethanol, isopropanol, and mixtures thereof.

23. The process as claimed in claim 20, wherein the alkaline solution is selected from the group consisting of an aqueous sodium hydroxide solution, an aqueous sodium carbonate solution, an aqueous sodium bicarbonate solution, an aqueous potassium hydroxide solution, potassium carbonate, an aqueous potassium bicarbonate, and mixtures thereof.

24. A process for the preparation of crystalline baricitinib Form M8, comprising the steps of:

a. dissolving baricitinib in a solvent to form a solution;

b. adding the solution obtained in step (a) to a mixture containing of crystalline baricitinib Form M8 seeds, water and optionally hydroxyl propyl methyl cellulose; and c. isolating crystalline baricitinib Form M8.

25. The process as claimed in claim 25, wherein the solvent is selected from the group consisting of water, diglyme (diethylene glycol dimethyl ether), 1 ,2-dimethoxyethane, dimethylformamide, 1 ,4-dioxane, dimethyl sulfoxide, and mixtures thereof.

26. A process for the preparation of crystalline baricitinib Form M8 comprising the step of drying crystalline baricitinib selected from the group consisting of Form M4, Form M6 at a temperature of 200 °C to 230 °C ± 5 °C .