WO2010117738A2

WO2010117738A2 - Solid state forms of sitagliptin salts

Info

Publication number: WO2010117738A2
Application number: PCT/US2010/029098
Authority: WO
Inventors: Gideon Pilarski; Nurit Perlman; Ariel Mittelman; Nada Kosutic Hulita; Marina Kalujny; Revital Ramaty
Original assignee: Teva Pharmaceutical Industries Ltd.; Teva Pharmaceuticals Usa, Inc.
Priority date: 2009-03-30
Filing date: 2010-03-29
Publication date: 2010-10-14
Also published as: WO2010117738A3; EP2398803A2; CA2757241A1; US8329696B2; KR20110135397A; US20120316175A1; US20100249140A1; IL215315A0

Abstract

Solid state forms of Sitagliptin salts, processes for preparing the solid state forms, and pharmaceutical compositions thereof, are provided.

Description

SOLID STATE FORMS OF SITAGLIPTIN SALTS

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application

Serial Nos. 61/164,563, filed March 30, 2009; 61/170,697, filed April 20, 2009; 61/174,073, filed April 30, 2009; 61/182,772, filed June 1, 2009; 61/186,031, filed June 11, 2009; 61/302,626, filed February 9, 2010; 61/304,615, filed February 15, 2010; 61/309,024, filed March 1, 2010; 61/312,376, filed March 10, 2010; and 61/315,149, filed March 18, 2010, which are incorporated herein by reference.

FIELD OF THE INVENTION

[0002] The invention relates to crystalline and amorphous forms of Sitagliptin salts, processes for preparing the crystalline forms, and pharmaceutical compositions thereof.

BACKGROUND OF THE INVENTION

[0003] Sitagliptin, (3i?)-3-amino-l-[9-(trifluoromethyl)-l,4,7,8-tetrazabicyclo-

[4.3.0]nona-6,8-dien-4-yl]-4-(2,4,5-trifluorophenyl)butan-l-one, has the following chemical structure:

Sitagliptin

[0004] Sitagliptin phosphate is a glucagon-like peptide 1 metabolism modulator, hypoglycemic agent, and dipeptidyl peptidase IV inhibitor. Sitagliptin is currently marketed in the United States as its phosphate salt in its monohydrate form under the trade name JANUVIA™. JANUVIA™ is indicated to improve glycemic control in patients with type 2 diabetes mellitus. [0005] The following PCT Publications describe the synthesis of Sitagliptin via stereoselective reduction: WO 2004/087650, WO 2004/085661, and WO 2004/085378.

[0006] Several crystalline forms of Sitagliptin phosphate are described in the literature. WO 2005/020920 describes crystalline forms I, II, III and an ethanol solvate; WO 2005/030127 describes crystalline form IV; WO 2005/003135 describes a monohydrate form, and WO 2006/033848 described the amorphous form.

[0007] Crystalline forms of Sitagliptin salts are described in PCT publications nos.

WO2009/085990, WO2010/000469, and WO2010/012781.

[0008] Polymorphism, the occurrence of different crystal forms, is a property of some molecules and molecular complexes. A single molecule may give rise to a variety of polymorphs having distinct crystal structures and physical properties like melting point, thermal behaviours (e.g. measured by thermogravimetric analysis - "TGA", or differential scanning calorimetry - "DSC"), x-ray diffraction pattern, infrared absorption fingerprint, and solid state NMR spectrum. One or more of these techniques may be used to distinguish different polymorphic forms of a compound.

[0009] Discovering new polymorphic forms and solvates of a pharmaceutical product can provide materials having desirable processing properties, such as ease of handling, ease of processing, storage stability, and ease of purification or as desirable intermediate crystal forms that facilitate conversion to other polymorphic forms. New polymorphic forms and solvates of a pharmaceutically useful compound or salts thereof can also provide an opportunity to improve the performance characteristics of a pharmaceutical product. It enlarges the repertoire of materials that a formulation scientist has available for formulation optimization, for example by providing a product with different properties, e.g., better processing or handling characteristics, improved dissolution profile, or improved shelf-life. For at least these reasons, there is a need for additional polymorphs of Sitagliptin (or a salt thereof).

[0010] The present invention discloses solid state forms of Sitagliptin salts.

SUMMARY OF THE INVENTION [0011] The present invention provides crystalline forms of Sitagliptin salts, and processes for preparing them.

[0012] The invention further provides a pharmaceutical formulation comprising the below described crystalline forms of Sitagliptin salts. This pharmaceutical composition may additionally comprise at least one pharmaceutically acceptable excipient.

[0013] The invention further provides the use of the solid state forms described below for the manufacture of a medicament for the treatment of of type 2 diabetes mellitus.

BRIEF DESCRIPTION OF THE FIGURES

[0014] Figure Ia shows a powder XRD pattern of crystalline Form Sl of

Sitagliptin sulfate.

[0015] Figure Ib shows a powder XRD pattern of crystalline Form S2 of

Sitagliptin sulfate.

[0016] Figure Ic shows a powder XRD pattern of crystalline Form S3 of

Sitagliptin sulfate.

[0017] Figure Id shows a powder XRD pattern of crystalline Form S4 of

Sitagliptin sulfate.

[0018] Figure Ie shows a powder XRD pattern of crystalline Form S5 of

Sitagliptin sulfate.

[0019] Figure 1 f shows a powder XRD pattern of crystalline Form S6 of

Sitagliptin sulfate.

[0020] Figure Ig shows a powder XRD pattern of crystalline Form S7of Sitagliptin sulfate.

[0021] Figure Ih shows a powder XRD pattern of crystalline Form S7 of

Sitagliptin sulfate. [0022] Figure Ii shows a solid state ¹³C NMR spectrum of Sitagliptin sulfate Form

S7 in the 0-200 ppm range.

[0023] Figure Ij shows a solid state ¹³C NMR spectrum of Sitagliptin sulfate Form

S7 in the 100-180 ppm range.

[0024] Figure Ik shows a powder XRD pattern of crystalline Form S8 of

Sitagliptin sulfate. The peak at 28.5° is attributed to silicon powder, added to the sample as internal standard.

[0025] Figure 11 shows a DSC thermogram of the heating process of Sitagliptin sulfate form S2 to obtain form S8.

[0026] Figure Im shows a solid-state ¹³C NMR spectrum of Sitagliptin sulfate

Form S2 in the 0-200 ppm range.

[0027] Figure In shows a solid-state ¹³C NMR spectrum of Sitagliptin sulfate

Form S2 in the 100-180 ppm range.

[0028] Figure Io shows a solid-state ¹³C NMR spectrum of Sitagliptin sulfate

Form S3 in the 0-200 ppm range.

[0029] Figure Ip shows a solid-state ¹³C NMR spectrum of Sitagliptin sulfate

Form S3 in the 100-200 ppm range.

[0030] Figure Iq shows a transformation of Form S7 to Sl at 100% relative humidity. The peak at 28.5° is attributes to silicon powder.

[0031] Figure Ir shows a TGA termogram of Sitagliptin sulfate isopropanol solvate Form S7.

[0032] Figure Is shows a TGA termogram of Sitagliptin sulfate isopropanol solvate Form S7.

[0033] Figure 2a shows a powder XRD pattern of crystalline Form Dl of

Sitagliptin (+)-dibenzoyl-tartrate . [0034] Figure 2b shows a powder XRD pattern of crystalline Form D2 of

Sitagliptin (+)-dibenzoyl-tartrate .

[0035] Figure 3a shows a powder XRD pattern of crystalline Form Fl of

Sitagliptin fumarate.

[0036] Figure 3b shows a powder XRD pattern of crystalline Form F2 of

Sitagliptin fumarate.

[0037] Figure 3c shows a powder XRD pattern of crystalline Form Fl of

Sitagliptin fumarate.

[0038] Figure 3d shows a powder XRD pattern of crystalline Forms F2 and Fl of

Sitagliptin fumarate.

[0039] Figure 4a shows a powder XRD pattern of crystalline Form Ml of

Sitagliptin (D)-(+)-malate.

[0040] Figure 4b shows a powder XRD pattern of crystalline Form M2 of

Sitagliptin (D)-(+)-malate.

[0041 ] Figure 4c shows a powder XRD pattern of crystalline Form 11 of Sitagliptin

L-malate.

[0042] Figure 4d shows a solid-state ¹³C NMR spectrum of Sitagliptin L-malate

Form Il in the -10-200 ppm range.

[0043] Figure 4e shows a solid-state ¹³C NMR spectrum of Sitagliptin L-malate

Form Il in the 100-190 ppm range.

[0044] Figure 4f shows a powder XRD pattern of crystalline Form Il . The peak at

28.5° is attributed to silicon powder.

[0045] Figure 4g shows a solid-state ¹³C NMR spectrum of Sitagliptin D-malate

Form Ml in the 0-200 ppm range.

[0046] Figure 4h shows a solid-state ¹³C NMR spectrum of Sitagliptin D-malate

Form Ml in the 110-200 ppm range. [0047] Figure 5a shows a powder XRD pattern of crystalline Form Ol of

Sitagliptin oxalate.

[0048] Figure 5b shows a powder XRD pattern of crystalline Form 02 of

Sitagliptin oxalate.

[0049] Figure 5c shows a solid state ¹³C NMR spectrum of Sitagliptin oxalate

Form 02 in the 0-200 ppm range.

[0050] Figure 5d shows a solid state ¹³C NMR spectrum of Sitagliptin oxalate

Form 02 in the 140-180 ppm range.

[0051 ] Figure 6a shows a powder XRD pattern of crystalline Form Q 1 of

Sitagliptin quinate.

[0052] Figure 6b shows a solid state ¹³C NMR spectrum of Sitagliptin quinate

Form Ql in the 0-200 ppm range.

[0053] Figure 6c shows a solid state ¹³C NMR spectrum of Sitagliptin quinate

Form Ql in the 100-190 ppm range.

[0054] Figure 7a shows a powder XRD pattern of crystalline Form Ul of

Sitagliptin succinate.

[0055] Figure 7b shows a powder XRD pattern of crystalline Form Ul of

Sitagliptin succinate.

[0056] Figure 7c shows a powder XRD pattern of crystalline Form Ul of

Sitagliptin succinate.

[0057] Figure 9a shows a powder XRD pattern of crystalline Form El of

Sitagliptin acetate.

[0058] Figure 9b shows a XRD diffractogram of Acetate form El pure from peaks at 5.7°, 19.2° and 22.8° 2theta. The peak at 28.5° is attributed to silicon powder, added to the sample as internal standard. [0059] Figure 9c shows a solid-state ¹³C NMR spectrum of Sitagliptin acetate

Form El in the 0-200 ppm range.

[0060] Figure 9d shows a solid-state ¹³C NMR spectrum of Sitagliptin acetate

Form El in the 100-190 ppm range.

[0061] Figure 10a shows a powder XRD pattern of crystalline Form Al of

Sitagliptin maleate.

[0062] Figure 11a shows a powder XRD pattern of crystalline Form Nl of

Sitagliptin (S)-mandelate.

[0063] Figure l ib shows a powder XRD pattern of crystalline Form N2 of

Sitagliptin (S)-mandelate.

[0064] Figure l ie shows a powder XRD pattern of crystalline Form N3 of

Sitagliptin (S)-mandelate.

[0065] Figure 1 Id shows a powder XRD pattern of crystalline Form N4 of

Sitagliptin (S)-mandelate.

[0066] Figure l ie shows a powder XRD pattern of amorphous Sitagliptin mandelate.

[0067] Figure Hf shows a powder XRD pattern of crystalline Form N5 of

Sitagliptin (R)-mandelate.

[0068] Figure 1 Ig shows a powder XRD pattern of crystalline Form N6 of

Sitagliptin (R)-mandelate.

[0069] Figure 1 Ih shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form N4 in the 0-200 ppm range.

[0070] Figure 1 Ii shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form N4 in the 110-190 ppm range.

[0071] Figure 1 Ij shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form Nl in the 0-200 ppm range. [0072] Figure 1 Ik shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form Nl in the 110-190 ppm range.

[0073] Figure 111 shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form N2 in the 0-200 ppm range.

[0074] Figure 1 Im shows a solid state ¹³C NMR spectrum of Sitagliptin (S)-(+)- mandelate Form N2 in the 110-190 ppm range.

[0075] Figure 12a shows a powder XRD pattern of crystalline Form Ll of

Sitagliptin lactate.

[0076] Figure 12b shows a powder XRD pattern of crystalline Form L2 of

Sitagliptin lactate.

[0077] Figure 12c shows a powder XRD pattern of crystalline Form L2 of

Sitagliptin lactate.

[0078] Figure 12d shows a powder XRD pattern of crystalline Form L3 of

Sitagliptin lactate.

[0079] Figure 12e shows a powder XRD pattern of crystalline Form L4 of

Sitagliptin lactate.

[0080] Figure 13a shows a powder XRD pattern of amorphous Sitagliptin orotate, before drying.

[0081] Figure 13b shows a powder XRD pattern of amorphous Sitagliptin orotate, after drying.

[0082] Figure 13c shows a powder XRD pattern of amorphous Sitagliptin orotate, before drying.

[0083] Figure 13d shows a powder XRD pattern of amorphous Sitagliptin orotate, after drying. DETAILED DESCRIPTION OF THE INVENTION

[0084] The present application relates to new polymorphic forms of Sitagliptin salts. In some embodiments, the polymorphs of Sitagliptin salts of the invention are substantially free of any other polymorphic forms. By "substantially free" is meant that the forms of the present invention contain 20% (w/w) or less, 10% (w/w) or less, 5% (w/w) or less, 2% (w/w) or less, particularly 1% (w/w) or less, more particularly 0.5% (w/w) or less, and most particularly 0.2% (w/w) or less of any other polymorph. In other embodiments, the polymorphs of Sitagliptin salts of the invention contain from 1% to 20% (w/w), from 5% to 20% (w/w), or from 5% to 10% (w/w) of any other polymorph.

[0085] A crystal form may be referred to herein as being characterized by graphical data "as shown in" a Figure. Such data include, for example, powder X-ray diffractograms and solid state NMR spectra. The skilled person will understand that such graphical representations of data may be subject to small variations, e.g., in peak relative intensities and peak positions due to factors such as variations in instrument response and variations in sample concentration and purity, which are well known to the skilled person. Nonetheless, the skilled person would readily be capable of comparing the graphical data in the Figures herein with graphical data generated for an unknown crystal form and confirm whether the two sets of graphical data are characterizing the same crystal form or two different crystal forms.

[0086] As used herein, the term "room temperature" refers to a temperature of about 20⁰C to about 35°C, or about 25°C to about 35°C, or about 25°C to about 30⁰C, for example, about 25°C.

[0087] As used herein, the term "overnight" refers to a time interval from about 14 hours to about 24 hours, or about 14 hours to about 20 hours, for example, about 16 hours.

[0088] Unless indicated otherwise, the solid state forms of the present invention can be dried. Drying may be carried out, for example, at elevated temperature under reduced pressure. The crystalline form can be dried at a temperature from about 40⁰C to about 60⁰C, or about 40⁰C and about 50⁰C, for example, about 40⁰C. The drying can be carried out under reduced pressure (i.e., less than 1 atmosphere, for example, about 10 mbar to about 100 mbar, or about 10 mbar to about 25 mbar). The drying can take place over a period of about 8 hours to about 36 hours, or about 10 hours to about 24 hours, for example, about 16 hours. Drying can be carried out overnight.

[0089] Sitagliptin base, used in the present application, can be prepared, for example, by hydrogenating of (Z)-3-amino-l-(3-(trifluoromethyl)-5,6-dihydro-[l,2,4] triazolo[4,3-a]pyrazyn-7(8H)-yl)-4-(2,4,5-trifluorophenyl)but-2-en- 1 -one using a Rhodium-based catalyst, in the presence of a C₁-C₄ alcohol, for example, methanol, e.g. as indicated in Example 1 herein.

[0090] The present invention relates to crystalline forms of Sitagliptin sulfate, referred herein as Form S2, Form S6, and From S7.

[0091] In one embodiment, the present invention provides a crystalline Sitagliptin sulfate, designated Form S2, characterized by data selected from: a powder XRD pattern with peaks at 9.3°, 9.7°, 15.2°, 15.6° and 25.4° ± 0.2° 2Θ; a powder XRD pattern as shown in figure Ib; a solid-state ¹³C NMR spectrum with signals at 119.2, 150.3 and 170.6 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 180 ppm of 13.7, 44.8 and 65.1 ± 0.1 ppm; a ¹³C NMR spectrum as depicted in Figures Im and In; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 180 ppm is typically at 105.5 ± 1 ppm.

[0092] Sitagliptin sulfate Form S2 can be also characterized by a powder XRD pattern with peaks at 9.3°, 9.7°, 11.9°, 15.2°, 15.6°, 17.6°, 18.5°, 18.9°, 20.9° and 25.4° ± 0.2° 2Θ.

[0093] Sitagliptin sulfate Form S2 preferably has advantageous properties selected from at least one of: high crystallinity, solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density. In particular, Form S2 may have at least one of: high crystallinity, good mechanical stability, thermal stability, flowability, and solubility over a wide range of pH.

[0094] Sitagliptin sulfate crystalline Form S2 can be prepared by a process comprising forming a solution of Sitagliptin base in acetonitrile; combining the solution with sulfuric acid to form a precipitate; and isolating the obtained precipitate. Preferably, the sulfuric acid is used at a mol ratio of about 1 :0.5 of Sitagliptin base to sulfuric acid.

[0095] In another embodiment, the present invention provides a crystalline

Sitagliptin sulfate, designated Form S6, characterized by data selected from: a powder XRD pattern with peaks at 5.5°, 13.4°, 15.1°, 19.0° and 21.1° ± 0.3° 2Θ; a powder XRD diffractogram shown in figure If; and combinations thereof.

[0096] Sitagliptin sulfate Form S6 preferably has advantageous properties selected from at least one of: solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density. In particular, Form S6 may have at least one of: good mechanical stability, thermal stability, flowability, and solubility over a wide range of pH.

[0097] Sitagliptin sulfate crystalline Form S6 can be prepared by a process comprising forming a solution of Sitagliptin base in ethyl acetate; combining the solution with sulfuric acid to form a precipitate; and isolating the obtained precipitate. The obtained precipitate can be further dried. Preferably, the sulfuric acid is used at a mol ratio of about 1 :0.5 of Sitagliptin base to sulfuric acid.

[0098] In another embodiment, the present invention provides a crystalline

Sitagliptin sulfate isopropanol solvate, designated Form S7, characterized by data selected from: a powder XRD pattern with peaks at 5.2°, 15.6°, 16.6°, 18.7° and 21.1° ±0.2° 2Θ; a powder XRD diffractogram shown in figures Ig; a solid-state ¹³C NMR spectrum with signals at 120.4, 149.1 and 171.2 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 180 ppm of 15.1, 43.8 and 65.9 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures Ii and Ij; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 180 ppm is typically at 105.3 ± 1 ppm.

[0099] Alternatively, Form S7 can be characterized a powder XRD pattern with peaks at 5.2°, 15.6°, 16.6°, 17.1°, 18.7°, 19.4°, 17.0°, 20.2°, 21.1°, 21.7° and 22.9° ± 0.2° 2Θ. [00100] Sitagliptin sulfate Form S7 can be characterized by the TGA thermogram as shown in Figure Ir.

[00101] Sitagliptin sulfate Form S7 preferably has advantageous properties selected from at least one of: solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density. In particular, Form S7 may have at least one of: good mechanical stability, thermal stability, flowability, and solubility over a wide range ofpH.

[00102] Sitagliptin sulfate crystalline Form S7 can be prepared by a process comprising forming a solution of Sitagliptin base in isopropanol; combining the solution with sulfuric acid to form a precipitate; and isolating the obtained precipitate. The obtained precipitate can be further dried. Preferably, the sulfuric acid is used at a mol ratio of about 1 :0.5 of Sitagliptin base to sulfuric acid.

[00103] In another embodiment, the present invention provides a crystalline

Sitagliptin sulfate designated Form S 1 , characterized by data selected from: a powder XRD pattern with peaks at 11.8°, 13.7°, 14.4°, 17.0° and 17.5° ± 0.2° 2Θ; a powder XRD diffractogram as shown in figure Ia; and combinations thereof.

[00104] Sitagliptin sulfate Form Sl can be also characterized by a powder XRD pattern with peaks at 5.0°, 9.9°, 11.8°, 12.6°, 13.7°, 14.4°, 17.0°, 17.5° 19.0° and 20.8° ± 0.2° 2Θ.

[00105] Sitagliptin sulfate Form Sl preferably has advantageous properties selected from at least one of: solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density. In particular, Form S6 may have at least one of: good mechanical stability, thermal stability, and flowability.

[00106] Sitagliptin sulfate crystalline Form Sl can be prepared by a process comprising forming a solution of Sitagliptin base in isopropanol; combining that solution with sulfuric acid to form a precipitate; and isolating the obtained precipitate. Preferably, the sulfuric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to sulfuric acid.

[00107] In this process, and in the processes for the preparation of any of the crystalline Sitagliptin sulfate, after combining with sulfuric acid, the solution can be maintained at a temperature from about room temperature to about 5O⁰C, or at about room temperature, for example overnight. The precipitate is recovered by any conventional method known in the art, for example, by filtration. The precipitate may be dried at about 30⁰C to about 60⁰C, or about 40⁰C and about 50⁰C, for example, about 40⁰C. The drying can be carried out under reduced pressure (i.e., less than 1 atmosphere, for example, about 10 mbar to about 100 mbar, or about 10 mbar to about 25 mbar). The drying can take place over a period of about 8 hours to about 36 hours, about 10 hours to about 24 hours, for example, about 16 hours, or can be carried out overnight.

[00108] The present invention relates to crystalline form of Sitagliptin acetate, referred herein as Form El .

[00109] In one embodiment, the present invention provides a crystalline Sitagliptin acetate, designated Form El, characterized by data selected from: a powder XRD pattern with peaks at 6.2°, 11.1°, 12.5°, 17.7°, and 18.4° ±0.2° 2Θ; a powder XRD pattern as shown in figure 9a; a solid-state ¹³C NMR spectrum with signals at 122.3, 150.5 and 167.4 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 18.5, 46.7 and 63.6 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures 9c and 9d; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 180 ppm is typically at 103.8 ± 1 ppm.

[00110] Sitagliptin acetate Form El can be also characterized by a powder XRD pattern with peaks at 6.2°, 8.3°, 11.1°, 12.5°, 15.3°, 16.4°, 17.7°, 18.4°, 20.4°, and 22.2° ± 0.2° 2Θ.

[00111] Sitagliptin acetate Form El preferably has advantageous properties selected from at least one of: good crystallinity, solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density. In particular, Form El may have at least one of: good mechanical stability, thermal stability, flowability, and solubility over a wide range of pH.

[00112] Sitagliptin acetate crystalline Form El can be prepared by a process comprising forming a solution or a slurry of Sitagliptin base in ethyl acetate; combining the solution or the slurry with acetic acid to form a precipitate; and isolating the obtained precipitate. The obtained precipitate can be further dried. Preferably, the acetic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to acetic acid.

[00113] After the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00114] The present invention relates to crystalline form of Sitagliptin L-malate, referred herein as Form Il .

[00115] In one embodiment, the present invention provides a crystalline Sitagliptin

L-malate, designated Form II, characterized by data selected from: a powder XRD pattern with peaks at 6.0°, 8.0°, 12.8°, 18.0° and 20.4° ± 0.2° 2Θ; a powder XRD diffractogram shown in figure 4f; a solid-state ¹³C NMR spectrum with signals at 121.7, 150.8 and 173.0 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 17.2, 46.3 and 68.5 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures 4d and 4e; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 180 ppm is typically at 104.5 ± 1 ppm.

[00116] Form Il can be also characterized by a powder XRD pattern with peaks at

6.1°, 8.2°, 13.0°, 18.1° and 20.5° ± 0.2° 2Θ.

[00117] Form Il can be also characterized by a powder XRD pattern with peaks at

6.0°, 8.0°, 12.0°, 12.8°, 14.5°, 16.3°, 18.0°, 19.4°, 20.4° and 21.1° ± 0.2° 2Θ. [00118] Form Il can be also characterized by a powder XRD pattern with peaks at

6.1°, 8.2°, 12.1°, 13.0°, 14.6°, 16.4°, 18.1°, 19.5°, 20.5° and 21.2° ± 0.2° 2Θ.

[00119] Sitagliptin L-malate Form Il preferably has advantageous properties selected from at least one of: high crystallinity, solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density.

[00120] Form Il can be prepared by a process comprising forming a solution of

Sitagliptin base in acetonitrile; combining the solution with L-malic acid to form a precipitate; and isolating the obtained precipitate. The obtained precipitate can be further dried. Preferably, the sulfuric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to L-malic acid.

[00121] The present invention relates to crystalline form of Sitagliptin quinate, referred herein as Form Ql .

[00122] In one embodiment, the present invention provides a crystalline Sitagliptin quinate, designated Form Q 1 , characterized by data selected from: a powder XRD pattern with peaks at 7.3°, 8.6°, 10.5°, 12.6° and 13.9° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 6a; a solid-state ¹³C NMR spectrum with signals at 121.5, 169.0 and 180.3 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 16.8, 64.3 and 75.6 ± 0.1 ppm; and a ¹³C NMR spectrum is depicted in Figures 6b and 6c; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 190 ppm is typically at 104.7 ± lppm.

[00123] Sitagliptin quinate Form Ql can be also characterized by a powder XRD pattern with peaks at 7.3°, 8.6°, 10.5°, 12.6°, 13.9°, 16.1°, 16.4°, 16.8°, 17.8° and 19.2° ± 0.2° 2Θ.

[00124] Sitagliptin quinate Form Ql can be prepared by a process comprising forming a solution of Sitagliptin base in an organic solvent selected from acetonitrile, and isopropanol; and adding (lR,3R,4R,5R)-(-)-quinic acid to the solution to obtain Form Ql. Preferably, the (lR,3R,4R,5R)-(-)-quinic acid is used at a mol ratio of about 1 :1 of Sitagliptin base to (lR,3R,4R,5R)-(-)-quinic acid.

[00125] After the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00126] Sitagliptin acetate Form Ql preferably has advantageous properties selected from at least one of: good crystallinity, solubility, dissolution rate, morphology, thermal and mechanical stability to polymorphic conversion and/or to dehydration, storage stability, low content of residual solvent, a lower degree of hygroscopicity, flowability, and advantageous processing and handling characteristics such as compressibility, and bulk density.

[00127] The present invention provides additional Sitagliptin salts solid state forms.

[00128] Hereinafter, is described a crystalline Sitagliptin sulfate, designated Form

S3, characterized by data selected from: a powder XRD pattern with peaks at 7.4°, 16.1°, 18.3° and 24.9° ± 0.2° 2Θ; a powder XRD pattern as shown in figure Ic; a solid-state ¹³C NMR spectrum with signals at 119.9, 152.0 and 169.5 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 200 ppm of 16.7, 48.8 and 66.3 ± 0.1 ppm; ¹³C NMR spectrum is depicted in Figures Io and Ip; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 100 to 200 ppm is typically at 103.2 ± lppm.

[00129] Sitagliptin sulfate Form S3 can be also characterized by a powder XRD pattern with peaks at 4.8°, 5.7°, 7.4°, 13.5°, 14.3°, 15.0°, 16.1°, 18.3°, 22.8° and 24.9° ± 0.2° 2Θ.

[00130] Sitagliptin sulfate crystalline Form S3 can be prepared by a process comprising forming a solution of Sitagliptin base in ethyl acetate; combining the solution with sulfuric acid to form a precipitate; and isolating the obtained precipitate. Preferably, the sulfuric acid is used at a mol ratio of about 1 :0.5 of Sitagliptin base to sulfuric acid.

[00131] Hereinafter, is described a crystalline Sitagliptin sulfate, designated Form

54, characterized by data selected from: a powder XRD pattern with peaks at 5.3°, 7.8°, 16.7°, 19.4° and 21.6° ± 0.2° 2Θ; a powder XRD pattern as shown in figure Id; and combinations thereof.

[00132] Sitagliptin sulfate Form S4 can be also characterized by a powder XRD pattern with peaks at 5.3°, 5.9°, 11.7°, 12.4°, 15.7°, 16.7°, 17.3°, 18.8°, 19.3°, 21.2° and 21.6° ± 0.2° 2Θ.

[00133] Sitagliptin sulfate Form S4 can be also characterized by a powder XRD pattern with peaks at 5.3°, 5.9°, 7.8°, 11.7°, 12.4°, 15.7°, 16.7°, 17.3°, 18.8°, 19.3°, 21.2° and 21.6° ± 0.2° 2Θ.

[00134] Sitagliptin sulfate crystalline Form S4 can be prepared by a process comprising forming a mixture of Sitagliptin base in ethanol; combining the mixture with sulfuric acid to form a precipitate; and isolating the obtained precipitate. Preferably, the sulfuric acid is used at a mol ratio of about 1 : 0.5 of Sitagliptin base to sulfuric acid, respectively.

[00135] Hereinafter, is described a crystalline Sitagliptin sulfate, designated Form

55, characterized by data selected from: a powder XRD pattern with peaks at 4.8°, 13.6°, 14.3°, 15.5° and 18.2° ± 0.2° 2Θ; a powder XRD diffractogram shown in figure Ie; and combinations thereof.

[00136] Alternatively, Form S5 can be characterized by a powder XRD pattern with peaks at 4.8°, 13.6°, 14.3°, 15.5°, 18.2°, 19.0°, 19.4°, 22.1°, 23.4° and 24.5° ± 0.2° 2Θ.

[00137] Hereinafter, is described a crystalline Sitagliptin sulfate, designated Form

S8, characterized by data selected from: a powder XRD pattern with peaks at 5.8°, 9.7°, 15.4°, 19.1° and 20.8° ±0.2° 2Θ; a powder XRD diffractogram shown in figures Ik; and combinations thereof. [00138] Alternatively, Form S8 can be characterized a powder XRD pattern with peaks at 4.8°, 5.8°, 9.7°, 11.9°, 13.7°, 15.4°, 17.6°, 19.1°, 20.8° and 22.0° ± 0.2° 2Θ.

[00139] Hereinafter, is described a crystalline Sitagliptin (+)-dibenzoyl-tartrate, designated Form Dl, characterized by data selected from: a powder XRD pattern with peaks at 7.1°, 9.9°, 13.4°, 16.3° and 18.0° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 2a; and combinations thereof.

[00140] Sitagliptin dibenzoyl-tartrate Form Dl can be also characterized by a powder XRD pattern with peaks at 7.1°, 9.9°, 13.4°, 15.2°, 16.3°, 18.0°, 18.4°, 20.3°, 21.6° and 24.9° ± 0.2° 2Θ.

[00141] Sitagliptin (+)-dibenzoyl-tartrate Form Dl can be prepared by a process comprising forming a solution of Sitagliptin base in an organic solvent selected from acetonitrile, and ethyl acetate; and adding (+)-dibenzoyl-D-tartaric acid to the solution to obtain Form Dl. Preferably, the (+)-dibenzoyl-D-tartaric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to (+)-dibenzoyl-D-tartaric acid.

[00142] After the addition of the acid, in this process or any process for the preparation of any of the Sitagliptin (+)-dibenzoyl-tartrate polymorphs disclosed herein, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating can be maintained for about 1 to about 10 hours, or from about 1 to about 4 hours, for example for about 2 hours. Afterward, the mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, or about room temperature, for example, overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00143] Hereinafter, is described a crystalline Sitagliptin (+)-dibenzoyl-tartrate, designated Form D2, characterized by data selected from: a powder XRD pattern with peaks at 6.9°, 11.9°, 15.9° and 17.9° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 2b; and combinations thereof.

[00144] Sitagliptin (+)-dibenzoyl-tartrate Form D2 can be also characterized by a powder XRD pattern with peaks at 5.0°, 6.9°, 10.7°, 11.9°, 14.5°, 15.9°, 17.9°, 19.0°, 22.6° and 23.8° ± 0.2° 2Θ. [00145] Sitagliptin (+)-dibenzoyl-tartrate Form D2 can be prepared by a process comprising forming a mixture (e.g. a solution or a slurry) of Sitagliptin base in ethanol; and adding (+)-dibenzoyl-D-tartaric acid to obtain Form D2. Preferably, the (+)- dibenzoyldibenzoyl-D-tartaric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to (+)-dibenzoyl-D-tartaric acid.

[00146] Hereinafter, is described a crystalline Sitagliptin fumarate, designated Form

Fl, characterized by data selected from: a powder XRD pattern with peaks at 6.3°, 7.2°, 12.6°, 14.5° and 15.0° ± 0.3° 2Θ; a powder XRD pattern as shown in figure 3a; and combination thereof.

[00147] Sitagliptin fumarate Form Fl can be also characterized by a powder XRD pattern with peaks at 6.3°, 7.2°, 12.6°, 14.5°, 15.0°, 16.0°, 17.3°, 19.3° and 22.0° ± 0.3° 2Θ.

[00148] Sitagliptin fumarate Form Fl can be prepared by a process comprising forming a solution of Sitagliptin base in an organic solvent selected from acetonitrile, and ethanol; and adding fumaric acid to the solution to obtain Form Fl. Preferably, n-heptane is added as a co-solvent to induce precipitation. Preferably, the fumaric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to fumaric acid.

[00149] In this process, as well in the proceeding processes for the preparation of any of the crystalline form of Sitagliptin fumarate disclosed herein, after the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. The mixture can be heated for a time interval from about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. Afterward, the mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example to about room temperature, for example overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00150] Hereinafter, is described a crystalline Sitagliptin fumarate, designated Form

F2, characterized by data selected from: a powder XRD pattern with peaks at 10.5°, 11.4°, 13.2° and 13.8° ± 0.3° 2Θ; a powder XRD pattern as shown in figure 3b; and combinations thereof. [00151] Sitagliptin fumarate F2 is also characterized by a powder XRD pattern with peaks at 10.5°, 11.4°, 13.2°, 13.8°, 16.0°, 17.3°, 21.0°, and 25.0° ± 0.3° 2Θ.

[00152] Sitagliptin fumarate Form F2 can be prepared by a process comprising forming a solution of Sitagliptin base in ethyl acetate; and adding fumaric acid to obtain Form F2. Preferably, the fumaric acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to fumaric acid.

[00153] Hereinafter, is described a crystalline Sitagliptin (D)-(+)-malate, designated

Form Ml, characterized by data selected from: a powder XRD pattern with peaks at 13.1°, 14.1°, 15.7° and 19.6° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 4a; a solid- state ¹³C NMR spectrum with signals at 119.7, 151.9 and 183.3 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 110 to 200 ppm of 3.6, 35.8 and 67.2 ± 0.1 ppm; ¹³C NMR spectrum as shown in Figures 4g and 4h; and combinations thereof. The signal exhibiting the lowest chemical shift in the chemical shift area of 110 to 200 ppm is typically at 116.1 ± 1 ppm.

[00154] Sitagliptin (D)-(+)-malate Form Ml can be also characterized by a powder

XRD pattern with peaks at 10.7°, 13.1°, 14.1°, 15.7°, 17.3°, 17.9°, 19.6°, 20.8° and 21.6° ± 0.2° 2Θ.

[00155] Sitagliptin (D)-(+)-malate Form Ml can be prepared by a process comprising forming a solution of Sitagliptin base in acetonitrile; and adding D-(+)-malic acid to the solution to obtain Form Ml . Preferably, the D-(+)-malic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to D-(+)-malic acid.

[00156] After the addition of the acid, in any of the processes for preparing any of the crystalline Sitagliptin malate forms disclosed herein, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried. [00157] Hereinafter, is described a crystalline Sitagliptin (D)-(+)-malate, designated

Form M2. Sitagliptin malate Form M2 is characterized by the XRD diffractogram shown in figure 4b.

[00158] Sitagliptin (D)-(+)-malate Form M2 can be prepared by a process comprising forming a solution of Sitagliptin base in ethanol; and adding D-(+)-malic acid to the solution to obtain Form M2. Preferably, the D-(+)-malic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to D-(+)-malic acid.

[00159] Hereinafter, is described a crystalline Sitagliptin oxalate, designated Form

01, characterized by data selected from: a powder XRD pattern with peaks at 8.4°, 11.2°, 14.5°, 17.0° and 17.6° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 5a; and combinations thereof.

[00160] Sitagliptin oxalate Form Ol can be also characterized by a powder XRD pattern with peaks at 8.4°, 11.2°, 14.5°, 15.4°, 17.0°, 17.6°, 19.8°, 21.0°, 25.4° and 27.1° ± 0.2° 2Θ.

[00161] Sitagliptin oxalate Form 01 can be prepared by a process comprising forming a solution of Sitagliptin base in acetonitrile, or alternatively, forming a slurry in isopropanol; and adding oxalic acid to the solution or slurry, respectively, to obtain Form 01. Preferably, the oxalic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to oxalic acid.

[00162] After the addition of the acid, in any of the processes for preparing any of the crystalline Sitagliptin oxalate forms disclosed herein, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00163] Hereinafter, is described a crystalline Sitagliptin oxalate, designated Form

02, characterized by data selected from: a powder XRD pattern with broad peaks at 5. 7°, 10.7°, 14.7°, 17.1° and 18.2° ± 0.3° 2Θ; a powder XRD pattern as shown in figure 5b; and combinations thereof.

[00164] Sitagliptin oxalate Form 02 can be also characterized by data selected from: a solid-state ¹³C NMR spectrum with signals at 152.2, 165.1 and 167.5 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 140 to 180 ppm of 8.8, 21.7 and 24.1 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures 5c and 5d. The signal exhibiting the lowest chemical shift in the chemical shift area of 140 to 180 ppm is typically at 143.4 ± 1 ppm.

[00165] Sitagliptin oxalate Form 02 can be prepared by a process comprising forming a solution of Sitagliptin base in ethyl acetate; and adding oxalic acid to the solution to obtain Form 02. Preferably, the oxalic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to oxalic acid.

[00166] Hereinafter, is described a crystalline Sitagliptin succinate, designated

Form Ul, characterized by data selected from: a powder XRD pattern with peaks at 11.6°, 13.1°, 13.6°, 14.2° and 15.8° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 7b; and combinations thereof.

[00167] Sitagliptin succinate Form Ul can be also characterized by a powder XRD pattern with peaks at 10.6°, 11.6°, 13.1°, 13.6°, 14.2°, 15.8°, 17.4°, 24.5°, 25.3° and 25.8° ± 0.2° 2Θ.

[00168] Sitagliptin succinate Form Ul can be prepared by a process comprising forming a solution of Sitagliptin base in an organic solvent selected from ethanol, acetonitrile, and ethyl acetate; and adding succinic acid to obtain Form Ul. Preferably, the succinic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to succinic acid.

[00169] After the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00170] Hereinafter, is described a crystalline Sitagliptin maleate, designated Form

Al, characterized by data selected from: a powder XRD pattern with peaks at 5.8°, 11.5°, 14.7°, 16.7° and 18.0° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 10a; and combinations thereof.

[00171] Sitagliptin maleate Form Al can be also characterized by a powder XRD pattern with peaks at 5.8°, 11.5°, 14.7°, 16.7°, 17.3°, 18.0°, 18.6°, 19.5°, 21.0° and 22.9° ± 0.2° 2Θ.

[00172] Sitagliptin maleate crystalline Form Al can be prepared by a process comprising forming a solution of Sitagliptin base in ethanol; combining the solution with maleic acid; adding n-heptane to form a precipitate; and isolating the obtained precipitate. Preferably, the maleic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to maleic acid.

[00173] After the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can be further dried.

[00174] Hereinafter, is described a crystalline Sitagliptin (S)-mandelate, designated

Form Nl, characterized by data selected from: a powder XRD pattern with peaks at 12.1°, 17.5°, 20.2°, 21.0° and 26.0° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 11a; and combinations thereof.

[00175] Sitagliptin (S)-mandelate Form Nl can be also characterized by a powder

XRD pattern with peaks at 3.3°, 5.8°, 6.9°, 12.1°, 14.6°, 17.5°, 19.6°, 20.2°, 21.0° and 26.0° ± 0.2° 2Θ. [00176] Sitagliptin (S)-mandelate From Nl can be also characterized by data selected from: a solid-state ¹³C NMR spectrum with signals at 144.2, 168.3 and 179.1 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 110 to 190 ppm of 24.6, 48.7 and 59.5 ± 0.1 ppm; and a ¹³C NMR spectrum is depicted in Figures 1 Ij and I lk. The signal exhibiting the lowest chemical shift in the chemical shift area of 110 to 190 ppm is typically at 119.6 ± lppm

[00177] Sitagliptin (S)-mandelate crystalline Form Nl can be prepared by a process comprising forming a solution of Sitagliptin base in acetonitrile; combining the solution with mandelic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the mandelic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to mandelic acid. Preferably, the acid is (S)-(+)-mandelic acid.

[00178] After the addition of the acid, in any of the processes herein for preparing any of the crystalline Sitagliptin mandelate forms, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours to about 3 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00179] Hereinafter, is described a crystalline Sitagliptin (S)-mandelate, designated

Form N2, characterized by data selected from: a powder XRD pattern with peaks at 11.8°, 17.0°, 18.1°, 22.4° and 24.2° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 1 Ib; and combinations thereof.

[00180] Sitagliptin (S)-Form N2 can be also characterized by a powder XRD pattern with peaks at 3.3°, 5.9°, 6.8°, 11.8°, 14.6°, 17.0°, 18.1°, 18.6°, 22.4° and 24.2° ± 0.2° 2Θ.

[00181] Sitagliptin (S)-mandelate Form N2 can be also characterized by data selected from: a solid-state ¹³C NMR spectrum with signals at 144.4, 167.8 and 179.0 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 110 to 190 ppm of 24.7, 48.1 and 59.3 ± 0.1 ppm; and a ¹³C NMR spectrum is depicted in Figures 111 and 1 Im. The signal exhibiting the lowest chemical shift in the chemical shift area of 110 to 190 ppm is typically at 119.7 ± lppm.

[00182] Sitagliptin (S)-mandelate crystalline Form N2 can be prepared by a process comprising forming a solution of Sitagliptin base in ethyl acetate; combining the solution with mandelic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the mandelic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to mandelic acid. Preferably, the acid is (S)-(+)-mandelic acid.

[00183] Hereinafter, is described a crystalline Sitagliptin (S)-mandelate, designated

Form N3, characterized by data selected from: a powder XRD pattern with peaks at 6.0°, 6.7°, 7.2°, 14.4° and 18.1° ± 0.2° 2Θ; a powder XRD pattern as shown in figure l ie; and combinations thereof.

[00184] Sitagliptin (S)-mandelate Form N3 can be also characterized by a powder

XRD pattern with peaks at 6.0°, 6.7°, 7.2°, 13.2°, 14.4°, 16.9°, 18.1°, 18.8°, 20.7° and 22.9° ± 0.2° 2Θ.

[00185] Sitagliptin (S)-mandelate crystalline Form N3 can be prepared by a process comprising forming a solution of Sitagliptin base in ethanol; combining the solution with mandelic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the mandelic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to mandelic acid. Preferably, the acid is (S)-(+)-mandelic acid.

[00186] Hereinafter, is described a crystalline Sitagliptin (S)-mandelate, designated

Form N4, characterized by data selected from: a powder XRD pattern with peaks at 2.8°, 4.0°, 7.9°, 16.3° and 17.5° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 1 Id; and combinations thereof.

[00187] Sitagliptin (S)-mandelate Form N4 can be also characterized by a powder

XRD pattern with peaks at 2.8°, 4.0°, 7.9°, 14.8°, 15.5°, 16.3°, 17.0°, 17.5°, 17.9° and 23.6° ± 0.2° 2Θ. [00188] Sitagliptin (S)-mandelate Form N4 can be also characterized by data selected from: a solid-state ¹³C NMR spectrum with signals at 126.0, 149.7 and 179.7 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 110 to 190 ppm of 6.3, 30.0 and 60.0 ± 0.1 ppm; and a ¹³C NMR spectrum is depicted in Figures 1 Ih and 1 Ii. The signal exhibiting the lowest chemical shift in the chemical shift area of 110 to 190 ppm is typically at 119.7 ± lppm.

[00189] Sitagliptin (S)-mandelate crystalline Form N4 can be prepared by a process comprising forming a solution of Sitagliptin base in acetone; combining the solution with mandelic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the mandelic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to mandelic acid. Preferably, the acid is (S)-(+)-mandelic acid.

[00190] Hereinafter, is described a crystalline Sitagliptin (R)-(-)- mandelate, designated Form N5, characterized by data selected from: a powder XRD pattern with peaks at 5.5°, 7.6°, 14.4°, 16.0° and 17.7° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 1 If; and combinations thereof.

[00191 ] Preferably, Form N5 is substantially free of a peak at 6.0° ± 0.2° 2Θ.

[00192] Sitagliptin (R)-(-)-mandelate Form N5 can be also characterized by a powder XRD pattern with peaks at 5.5°, 7.6°, 14.4°, 16.0°, 17.7°, 22.1°, 22.8°, 24.0°, 25.1° and 26.5° ± 0.2° 2Θ.

[00193] Hereinafter, is described a crystalline Sitagliptin (R)-(-)- mandelate, designated Form N6, characterized by data selected from: a powder XRD pattern with peaks at 5.8°, 14.7°, 16.1°, 16.6° and 17.1° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 1 Ig; and combinations thereof.

[00194] Sitagliptin (R)-(-)-mandelate Form N6 can be also characterized by a powder XRD pattern with peaks at 5.8°, 14.7°, 16.1°, 16.6°, 17.1°, 18.6°, 19.5°, 21.7°, 23.9° and 25.7° ± 0.2° 2Θ.

[00195] Hereinafter, is described amorphous Sitagliptin mandelate. The amorphous

Sitagliptin mandelate is characterized by the XRD diffractogram shown in figure l ie. [00196] The amorphous Sitagliptin mandelate can be prepared by a process comprising forming a slurry of Sitagliptin base in methyl tert-butyl ether; combining the slurry with mandelic acid; and isolating the obtained precipitate. Preferably, the mandelic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to mandelic acid. Preferably, the acid is (S)-(+)-mandelic acid.

[00197] After the addition of the acid, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can be further dried.

[00198] Hereinafter, is described a crystalline Sitagliptin lactate, designated Form

Ll, characterized by data selected from: a powder XRD pattern with peaks at 10.7°, 17.9°, 20.3° and 21.4° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 12a; and combinations thereof.

[00199] Sitagliptin lactate Form Ll can be also characterized by a powder XRD pattern with peaks at 6.1°, 8.3°, 10.7°, 17.9°, 20.3°, 21.4°, 23.5°, 25.1° and 27.2° ± 0.2° 2Θ.

[00200] Sitagliptin lactate crystalline Form Ll can be prepared by a process comprising forming a solution of Sitagliptin base in acetonitrile; combining the solution with lactic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the lactic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to lactic acid.

[00201] After the addition of the acid, in any of the processes for preparing any of the crystalline Sitagliptin lactate forms, the obtained mixture can be heated to a temperature from about 4O⁰C to about 6O⁰C, or from about 45⁰C to about 55⁰C, for example about 5O⁰C. Heating is applied for example, for about 1 to about 10 hours, or from about 1 to about 4 hours, for example, for about 2 hours. The mixture can be cooled to a temperature from about O⁰C to about room temperature, or from about 1O⁰C to about room temperature, for example about room temperature, preferably overnight, before collecting the obtained precipitate. The obtained precipitate can further be dried.

[00202] Hereinafter, is described a crystalline Sitagliptin lactate, designated Form

L2, characterized by data selected from: a powder XRD pattern with peaks at 6.6°, 7.8°, 10.6°, 17.9° and 20.3° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 12c; and combinations thereof.

[00203] Sitagliptin lactate Form L2 can be also characterized by a powder XRD pattern with peaks at 3.3°, 5.9°, 6.6°, 7.8°, 10.6°, 16.1°, 17.9°, 19.5°, 20.3°, 21.7°, 25.8° and 27.4° ± 0.2° 2Θ.

[00204] Sitagliptin lactate crystalline Form L2 can be prepared by a process comprising forming a solution of Sitagliptin base in an organic solvent selected from acetone, and ethyl acetate; combining the solution with lactic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the lactic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to lactic acid.

[00205] Hereinafter, is described a crystalline Sitagliptin lactate, designated Form

L3, characterized by data selected from: a powder XRD pattern with peaks at 5.3°, 6.2°, 8.5°, 10.6° and 17.8° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 12d; and combinations thereof.

[00206] Sitagliptin lactate Form L3 can also be characterized by a powder XRD pattern with peaks at 5.3°, 6.2°, 8.5°, 10.6°, 15.3°, 17.8°, 19.5°, 19.9°, 22.4° and 28.0° ± 0.2° 2Θ.

[00207] Sitagliptin lactate crystalline Form L3 can be prepared by a process comprising forming a slurry of Sitagliptin base in methyl tert-butyl ether; combining the slurry with lactic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the lactic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to lactic acid.

[00208] Hereinafter, is described a crystalline Sitagliptin lactate, designated Form

L4, characterized by data selected from: a powder XRD pattern with peaks at 7.7°, 10.7°, 17.3°, 18.1° and 25.2° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 12e; and combinations thereof.

[00209] Sitagliptin lactate Form L4 can be also characterized by a powder XRD pattern with peaks at 7.7°, 9.7°, 10.7°, 12.6°, 16.6°, 17.3°, 18.1°, 20.7°, 23.1° and 25.2° ± 0.2° 2Θ.

[00210] Sitagliptin lactate crystalline Form L4 can be prepared by a process comprising forming a solution of Sitagliptin base in ethanol; combining the solution with lactic acid to form a precipitate; and isolating the obtained precipitate. Preferably, the lactic acid is used at a mol ratio of about 1 : 1 of Sitagliptin base to lactic acid.

[00211] Hereinafter, is described amorphous Sitagliptin orotate. The amorphous

Sitagliptin orotate is characterized by the XRD diffractogram shown in figures 13a-d.

[00212] The present invention further encompasses 1) a pharmaceutical composition comprising any one, or combination, of solid state Forms, as described above and at least one pharmaceutically acceptable excipient and 2) the use of any one, or combination, of the above-described solid state Forms, in the manufacture of a pharmaceutical composition. The pharmaceutical composition can be useful for the treatment of type 2 diabetes mellitus. The present invention also provides crystalline forms as described above for use as a medicament, preferably for the treatment of type 2 diabetes mellitus.

[00213] Having described the invention with reference to certain preferred embodiments, other embodiments will become apparent to one skilled in the art from consideration of the specification. The invention is further defined by reference to the following examples describing in detail the preparation of the composition and methods of use of the invention. It will be apparent to those skilled in the art that many modifications, both to materials and methods, may be practiced without departing from the scope of the invention.

X-Ray Power Diffraction:

[00214] Unless recited otherwise, X-Ray powder diffraction data was obtained by using methods known in the art using a SCINTAG powder X-Ray diffractometer model X'TRA equipped with a solid-state detector. Copper radiation of 1.5418 A was used. A round aluminum sample holder with zero background was used. The scanning parameters included: range: 2-40 degrees two-theta; scan mode: continuous scan; step size: 0.05 deg.; and a rate of 3 deg/min.

¹³C NMR spectra:

[00215] ¹³C NMR at 125MHz using Bruker Avance 11+ 500. SB probe using 4mm rotors

[00216] Magic angle was set using KBr. Homogeneity of magnetic field checked using adamantane. Parameters for Cross polarization optimized using glycine.

[00217] Spectral reference set according to glycine as external standard (176.03 ppm for low field carboxyl signal).

Magic Angle Spinning Rate: 11 kHz

Pulse Program: cp with tppml5 during decoupling

Delay time: 5s (except for Sitagliptin acetate, wherein the delay time was 10s)

Contact time: 2ms

Number of Scans: 1024

TGA thermogram:

[00218] TGA thermogram was measured using METTLER TOLEDO TGA/DSC

STAR⁶.

Heating rate: 10°/minute. N₂ flow rate: 40ml/minute

EXAMPLES

Example 1 :

[00219] Rhodium(I) chloride 1,5-cyclooctadiene complex (24.1 mg, 0.2%) and (R)-

(-)-l-[(S)-2-diphenylphosphino)ferrocenyl]ethyl di-tert-butylphosphine (56.8 mg, 0.44%) were added to degassed methanol (20 mL). The resulting solution was stirred at 25⁰C, degassed again, and then stirred for one hour at 25⁰C. This catalyst solution was used in the hydrogenation described below.

[00220] (Z)-3-amino-l-(3-(trifluoromethyl)-5,6-dihydro-[l,2,4]triazolo[4,3-a]- pyrazyn-7(8H)-yl)-4-(2,4,5-trifluorophenyl)but-2-en-l-one (10 gr, 1 equivalent) and methanol (50 ml) were added to a 250 ml hydrogenation bottle at 25⁰C and the bottle was subjected to vacuum and nitrogen backflush three times. The catalyst solution was added to the hydrogenation bottle and the bottle was again subjected to vacuum and nitrogen backflush three times and then to vacuum and backflush with hydrogen gas three times. The resulting reaction mixture was maintained under hydrogen at a pressure of 5 bar and heated to 55⁰C. The heated mixture was stirred at 5 bar pressure, at 55⁰C for 3 days to obtain Sitagliptin base in methanol solution (optical purity by HPLC 97%, purity by HPLC 63.7%).

Example 2: Sitagliptin (STG) sulfate crystalline form Sl

[00221] An half amount of the solution obtained in Example 1, was evaporated and dissolved in isopropanol (25ml). A solution of sulfuric acid (0.6gr in 25ml of isopropanol) was added over 40 minutes and the resulting mixture was stirred at 25⁰C for 16 hours. The product was separated by vacuum filtration, and the filtered product was washed with isopropanol (10ml) and dried in vacuum oven at 40⁰C for 16 hours to obtain 2.9gr of Sitagliptin sulfate crystalline form S 1.

Example 3 : STG dibenzoyl-D-tartarate crystalline form Dl

[00222] STG (Sitagliptin) base (350 mg) was dissolved in acetonitrile (2mL) at

25°C. (+)-Dibenzoyl-D-tartaric acid (98%, 323mg, leq) was then added and the resulting mixture was heated to 50⁰C. The mixture became a very thick slurry, therefore additional acetonitrile (1.5 mL) was added. The resulting mixture was stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C overnight. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG dibenzoyl-D-tartarate crystalline form Dl.

Example 4: STG dibenzoyl-D-tartarate crystalline form Dl

[00223] STG base (350 mg) was dissolved in ethyl acetate (4.5 mL) at 25°C. (+)-

Dibenzoyl-D-tartaric acid (98%, 323 mg, leq) was then added and the resulting mixture was heated to 50⁰C. The mixture became a very thick slurry, therefore additional ethyl acetate (1.5 mL) was added. The resulting mixture was stirred at 50⁰C for 2 hours, cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG dibenzoyl-D-tartarate crystalline form Dl.

Example 5 : STG dibenzoyl-D-tartarate crystalline form D2

[00224] STG base (350 mg) was partially dissolved in ethanol (3.5 mL) at 25°C.

(+)-Dibenzoyl-D-tartaric acid (98%, 323 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG dibenzoyl-D-tartarate crystalline form D2.

Example 6: Mixture of STG dibenzoyl-D-tartarate crystalline forms Dl and D2. [00225] STG base (350 mg) was dissolved in isopropanol (3.5 mL) at 25°C. (+)-Di- benzoyl-D-tartaric acid (98%, 323 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain a mixture of sitagliptin dibenzoyl-D-tartarate crystalline forms Dl and D2.

Example 7: STG fumarate crystalline form Fl

[00226] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C. Fumaric acid (100 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain a mixture of sitagliptin fumarate crystalline form Fl and fumaric acid.

Example 8: STG fumarate crystalline form F2

[00227] STG base (350 mg) was dissolved in ethyl acetate (4.5 mL) at 25°C.

Fumaric acid (92 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG fumarate crystalline form F2.

Example 9: STG malate crystalline form Ml [00228] STG base (350 mg) was dissolved in acetonitrile (2 niL) at 25°C. D-(+)- malic acid (115 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG D-malate crystalline form Ml.

Example 10: STG oxalate crystalline form Ol

[00229] STG base (350 mg) was dissolved in ethanol (3.5 mL) at 25°C. Oxalic acid

(108 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG oxalate crystalline form 01.

Example 11 : STG oxalate crystalline form Ol

[00230] STG base (350 mg) was dissolved in isopropanol (3.5 mL) at 25°C. Oxalic acid (108 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG oxalate crystalline form 01.

Example 12: STG quinate crystalline form Ql

[00231] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C.

(lR,3R,4R,5R)-(-)-quinic acid (98%, 165 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG quinate crystalline form Ql.

Example 13: STG succinate crystalline form Ul

[00232] STG base (350 mg) was dissolved in ethanol (3.5 mL) at 25°C. Succinic acid (101 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG succinate crystalline form Ul, as shown in Figure 7a.

Example 14: STG succinate crystalline form Ul [00233] STG base (350 mg) was dissolved in acetonitrile (2 niL) at 25°C. Succinic acid (99%, 101 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to produce STG succinate crystalline form Ul, as shown in Figure 7b.

Example 15: STG succinate crystalline form Ul

[00234] STG base (350 mg) was dissolved in ethyl acetate (4.5 mL) at 25°C. succinic acid (99%, 101 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG succinate crystalline form Ul, as shown in Figure 7c.

Example 16: STG oxalate crystalline form Ol

[00235] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C. Oxalic acid (108mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG oxalate crystalline form 01.

Example 17: STG oxalate form 02

[00236] STG base (350 mg) was dissolved in ethyl acetate (4.5 mL) at 25°C.

Oxalic acid (108 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG oxalate form 02.

Example 18: STG sulfate crystalline form S2

[00237] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C. Sulfuric acid (95.6%, 24 μL, 0.5 eq) was then added and the mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C over weekend. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG sulfate crystalline form S2. Example 19:

[00238] STG base (350 mg) was dissolved in ethyl acetate (4.5 niL) at 25°C.

Sulfuric acid (95.6%, 24 μL, 0.5 eq) was then added and the mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C over weekend. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG sulfate crystalline form S3.

Example 20:

[00239] STG base (350 mg) was partially dissolved in ethanol (3.5 mL) at 25°C.

Sulfuric acid (95.6%, 24μL, 0.5eq) was then added and the mixture was heated to 50⁰C, dissolved while heating, then stirred at 50⁰C for 2 hours, cooled gradually to 25°C and stirred at 25°C over weekend. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG sulfate crystalline form S4.

Example 21 : STG fumarate crystalline form Fl

[00240] STG base (350 mg) was slurry in ethanol (3.5 mL) at 25°C. Fumaric acid

(99.5mg leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours.

[00241] The solution was clear; therefore, it was maintained at 4⁰C for over a weekend. Then n-heptane (6 mL) was added, and the resulting mixture was stirred for 16 hours at 25°C. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG quinate crystalline form Fl.

Example 22: STG fumarate - mixture of forms F2 and Fl

[00242] STG base (350 mg) was partially dissolved in isopropanol (3.5 mL) at

25°C. Fumaric acid (100 mg, leq) was then added and the resulting mixture was heated to

50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours.

[00243] The solution was clear; therefore it was maintained at 4⁰C over a weekend.

Then n-heptane (6 mL) was added, and the resulting mixture was stirred for 16 hours at 25°C. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain sitagliptin fumarate polymorphic mixture of forms F2 and Fl, as shown in Figure 3d. Example 23 : STG quinate crystalline form Ql

[00244] STG base (350 mg) was slurried in isopropanol (3.5 mL) at 25°C.

(lR,3R,4R,5R)-(-)-Quinic acid (98%, 166 mg, 1 eq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG quinate crystalline form Ql .

Example 28: STG malate crystalline form M2

[00245] STG base (350 mg) was dissolved in ethanol (3.5 mL) at 25°C. D-(+)- malic acid (115 mg, 1 eq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG D-malate crystalline form M2.

Example 29: STG acetate crystalline form El

[00246] STG base (350 mg) was partially dissolved in ethyl acetate (3.5 mL) at

25°C. Acetic acid (50μL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG acetate crystalline form El.

Example 30: STG mandelate crystalline form Nl

[00247] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C. S-(+)- mandelic acid (130 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.75 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG mandelate crystalline form Nl .

Example 31 : STG mandelate crystalline form N2

[00248] STG base (350 mg) was partially dissolved in ethyl acetate (3.5 mL) at

25°C. S-(+)-mandelic acid (134 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.75 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG S-mandelate crystalline form N2. Example 32: STG S-mandelate crystalline form N3

[00249] STG base (350 mg) was dissolved in ethanol (2.5 mL) at 25°C. S-(+)- mandelic acid (130 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.75 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG S-mandelate crystalline form N3.

Example 33: STG S-mandelate crystalline form N4

[00250] STG base (350 mg) was dissolved in acetone (1.5 mL) at 25°C. S-(+)- mandelic acid (134mg, leq) was then added and the resulting mixture was heated to 40⁰C, stirred at 40⁰C for 2.75 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG S-mandelate crystalline form N4.

Example 34: Amorphous STG mandelate

[00251 ] STG base (350 mg) was slurried in methyl tert-butyl ether (3.5 mL) at

25°C. S-(+)-mandelic acid (132mg, leq) was then added and the resulting mixture was heated to 40⁰C, stirred at 40⁰C for 2.75 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain amorphous STG mandelate.

Example 35: STG lactate crystalline form Ll

[00252] STG base (350 mg) was dissolved in acetonitrile (2 mL) at 25°C. DL-lactic acid (110 μL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG lactate crystalline form Ll.

Example 36: STG lactate crystalline form L2

[00253] STG base (350 mg) was dissolved in acetone (1.5 mL) at 25°C. DL-Lactic acid (110 μL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The mixture formed was clear, therefore was put in a refrigerator at 4⁰C for 16 hours. The mixture was still clear, therefore n-Heptane (5 mL) was added and the resulting mixture was stirred at 25°C for 5 days. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG lactate crystalline form L2, as shown in Figure 12b.

Example 37: STG lactate crystalline form L2

[00254] STG base (350 mg) was partially dissolved in ethyl acetate (3.5 mL) at

25°C. DL-lactic acid (110 μL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG lactate crystalline form L2, as shown in Figure 12c.

Example 38: STG lactate crystalline form L3

[00255] STG base (350 mg) was slurried in methyl tert-butyl ether (3.5 mL) at

25°C. DL -lactic acid (110 μL, leq) was then added and the resulting mixture was heated to 40⁰C, stirred at 40⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours.

[00256] The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG lactate crystalline form L3. The material was retested by PXRD after 1 month storage and found to transform to form Ll .

Example 39: STG lactate crystalline form L4

[00257] STG base (350 mg) was dissolved in ethanol absolute (2.5 mL) at 25°C.

DL-Lactic acid (110 μL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The mixture formed was clear, therefore was put in a refrigerator at 4⁰C for 16 hours. The product was then isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG lactate crystalline form L4.

Example 40: STG maleate crystalline form Al

[00258] STG base (350 mg) was partially dissolved in ethanol absolute (3.5 mL) at

25°C. Maleic acid (102mg, leq) was then added and the resulting mixture was heated to

50⁰C, stirred at 50⁰C for 2 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The mixture formed was clear, and therefore was put in a refrigerator at 4⁰C for a week. [00259] The mixture formed was still clear, therefore n-Heptane (3 mL) was added.

The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG maleate crystalline form Al .

Example 41 : STG S-mandelate crystalline form N3

[00260] STG base (350 mg) was dissolved in tetrahydrofuran:water 1 :1 (1 mL) at

25°C. S-(+)-mandelic acid (134 mg, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 16 hours. The mixture formed was clear, therefore was put in a refrigerator at 4⁰C for 16 hours. The mixture was still clear, therefore n-heptane (5 mL), was added and the resulting mixture was stirred at 25°C for 5 days. The product was then isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG S-mandelate crystalline form N3.

Example 42: STG sulfate crystalline form S5

[00261] STG base (1.07 g) was dissolved in ethyl acetate (13mL) at 25°C, and was heated to 40⁰C to dissolve. The solution was then cooled to 25⁰C. Sulfuric acid (95.6%, 0.133mL, 0.5eq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 2.5 hours, then cooled gradually to 25°C and stirred at 25°C for 19 hours. The product was isolated by vacuum filtration and dried at 40⁰C for 16 hours to obtain STG sulfate crystalline form S5 (0.92 g, 69 % yield).

Example 43 : STG sulfate crystalline form S5

[00262] STG base (4 g) was dissolved in acetonitrile (24mL) at 25°C. Sulfuric acid

(95.6%, 0.54mL, leq) was then added and the resulting mixture was heated to 50⁰C, stirred at 50⁰C for 1.5 hours, then cooled gradually to 25°C and stirred at 25°C over night. The product was isolated by vacuum filtration and dried at 40⁰C over night to obtain 3.61gr STG sulfate crystalline form S5.

Example 44: STG sulfate form S6

[00263] STG base (5 g) was dissolved in ethyl acetate (65mL) at 25°C, heated to

40⁰C to dissolution, and then cooled to 25⁰C. Sulfuric acid (95.6%, 0.34mL, 0.5eq) was then added and the resulting mixtures heated to 50⁰C, stirred at 50⁰C for 3 hours, and then cooled gradually to 25°C and stirred at 25°C for 1.5 hours. The product was isolated by vacuum filtration and dried at 40⁰C over night to obtain STG sulfate form S6 (5.23g, 85 % yield).

Example 45 : STG (L)-malate crystalline form Il

[00264] STG base (5 g) was dissolved in acetonitrile (28.5mL) at 25°C. (L)-MaHc acid (1.65g, leq) was then added and the resulting mixture was heated to 50⁰C. After stirring at 50⁰C for 3 hours it was cooled gradually to 25°C and stirred overnight. The mixture formed was very viscous. It was cooled in an ice bath for 1 hour and then heated back to 25°C. n-Heptane(7mL) was added and the resulting mixture was stirred at 25°C for 2 hours. The product was isolated by vacuum filtration and dried at 40⁰C over night to obtain STG (L)-malate crystalline form Il (3.01gr).

Example 46: STG R-(-)-mandelate crystalline form N5

[00265] STG base (5g) was dissolved in acetonitrile (28.5mL) at 25°C. (R)-

Mandelic acid (1.87g, leq) was then added and the resulting mixture was heated to 50⁰C and stirred for 3 hours, then cooled gradually to 25°C and stirred overnight. The product was isolated by vacuum filtration and dried at 40⁰C overnight to obtain Sitagliptin R-(-)- mandelate crystalline form N5 (6.50gr, 95 % yield)

Example 47: STG R-(-)-mandelate crystalline form N6

[00266] STG base (5g) was dissolved in ethyl acetate (5OmL) at 25°C. and heated to

40⁰C to dissolve, then cooled back to room temperature. (R)-Mandelic acid (1.87g, leq) was then added and the resulting mixture was heated to 50⁰C and stirred for 3 hours, then cooled gradually to 25°C and stirred overnight. The product was isolated by vacuum filtration and dried at 40⁰C overnight to obtain Sitagliptin R-(-)-mandelate crystalline form N6 (6.62gr, 97 % yield)

Example 48: STG R-(-)-mandelate crystalline form N5

[00267] STG base (5g) was dissolved in absolute ethanol (35mL) at 25°C. and heated to 40⁰C to dissolve, then cooled to RT. (R)-Mandelic acid (1.87g, leq) was then added and the absolute mixture was heated to 50⁰C and stirred for 2.5 hours, then cooled gradually to 25°C and stirred overnight. The product was isolated by vacuum filtration and dried at 40⁰C for 70 hours to obtain Sitagliptin R-(-)-mandelate crystalline form N5 (6gr, 88% yield). Example 49: STG R-(-)-mandelate crystalline form N5

[00268] STG base (5g) was dissolved in acetone (21.5mL) at 25°C. (R)-Mandelic acid (1.87g, leq) was then added and the resulting mixture was heated to 40⁰C and stirred for 2.5 hours, then cooled gradually to 25°C and stirred overnight. The product was isolated by vacuum filtration and dried at 40⁰C for 70 hours to obtain Sitagliptin R-(-)- mandelate crystalline form N5 (4.69g, 69% yield).

Example 50: Amorphous STG orotate

[00269] STG base (0.5 g) was dissolved in acetonitrile (6.25mL) at 25°C. Orotic acid (0.19g, leq) was then added and the resulting mixture was heated to 75°C, and stirred for 45 minutes, then cooled gradually to 25°C and stirred overnight. The product was isolated by vacuum filtration to obtain amorphous Sitagliptin orotate as depicted in figure 13a. It was then dried at 40⁰C over night to obtain amorphous STG orotate, the powder X- ray diffractogram of which is depicted in figure 13b (0.44g, 64% yield).

Example 51 : Amorphous STG orotate

[00270] STG base (5 g) was dissolved in acetonitrile (6OmL) at 25°C. Orotic acid

(1.9g, leq) was then added and the resulting mixture was heated to 75°C, and stirred for 45 minutes, then cooled gradually to 25°C and stirred over night. The product was isolated by vacuum filtration to obtain amorphous Sitagliptin orotate (powder XRD is depicted in figure 13c. It was then dried at 40⁰C over night to obtain amorphous STG orotate (6.85g, 99% yield), (powder XRD is depicted in figure 13d)

Example 52: Sitagliptin sulfate Form S7

[00271] STG base (5 gr) was added into isopropanol (85 ml). The obtained mixture was heated to dissolution. The solution was cooled to room temperature and sulfuric acid 96.5% (0.6 gr, 0.5 eq) was added, then the slurry was stirred for 4 hours. The product was isolated by vacuum filtration; the cake was washed with hexane (10 ml), and dried at 4O⁰C in vacuum oven overnight to obtain Form S7 as shown in Figure Ig; 5.76 gr (93% yield). The TGA termogram is shown in Figure Ir.

Example 53: Sitagliptin sulfate Form S7

[00272] To STG base (5 gr), isopropanol (70 ml) was added, heated to dissolution, and cooled to room temperature. Sulfuric acid 96.5% (0.6 gr, 0.5 eq) was added and the solution became slurry and was stirred over night. The product was isolated by vacuum filtration; the cake was washed with isopropanol (20 ml), and dried at 4O⁰C in vacuum oven over night to obtain Form S7 as shown in Figure Ih; 5.51 gr. The TGA termogram is shown in Figure Is.

Example 54: Sitagliptin sulfate Form S8

[00273] A sample of form S2 was heated by DSC to 18O⁰C to obtain form S8 of

Sitagliptin sulfate. X-ray diffractogram of Sitagliptin sulfate form S8 is presented in figure Ik. DSC thermogram of the heating process is presented in figure 11.

[00274] DSC analysis was performed on Q 1000 MDSC TA instruments with heating rate of 10 °C/min, under nitrogen flow of 50 ml/min. Hermetic aluminum, closed pan was used, sample mass was about 8-10 mg.

Instrument type: DSC-TA QlOOO

[00275] Samples after being heated in hermetic crucible under experimental conditions described in DSC experiment are applied directly on silicon plate holder and mixed with small amount of Si powder. The X-ray powder diffraction pattern was measured with Philips X'Pert PRO X-ray powder diffractometer, equipped with Cu irradiation source =1.54060 A (Angstrom), X'Celerator (2.022° 2theta) detector. Scanning parameters: angle range: 3-40 deg., step size 0.0167, time per step 39s, continuous scan. The accuracy of peak positions was defined as ± 0.2 degrees due to experimental differences like instrumentations and sample preparations.

Example 55: Sitagliptin acetate Form El

[00276] To STG base (5 gr), ethyl acetate (35 ml) was added, heated to dissolution and cooled to room temperature. Then Acetic acid (0.703 ml, 1 eq) was added and the reaction mixture was heated to 5O⁰C. After 0.5 hour at 5O⁰C, precipitations were observed and the mixture was stirred for 2 hours. Then the reaction mixture was cooled to room temperature and stirred for 1 hour. The product was isolated by vacuum filtration, the cake was washed with ethyl acetate, and dried at 4O⁰C in vacuum oven over night to obtain Form El; 4.19 gr (73% yield).

Example 56: transformation of Form S7 to Form S 1 [00277] About 150mg of Sitagliptin sulfate form S7 were put in an open Petrii dish and kept at 100±5% RH (relative humidity) and room temperature for 12 days. It was then analyzed by powder XRD. The resulted form Sl is presented in figure Iq.

[00278] For XRD measurement samples are mixed with small amount of Si powder and applied directly on silicon plate holder. The X-ray powder diffraction pattern was measured with Philips X'Pert PRO X-ray powder diffractometer, equipped with Cu irradiation source =1.54060 A (Angstrom), X'Celerator (2.022° 2Q) detector. Scanning parameters: angle range: 3-40 deg., step size 0.0167, time per step 39s, continuous scan.

Claims

What is claimed is:

1. Sitagliptin sulfate, designated Form S2, characterized by data selected from: a powder XRD pattern with peaks at 9.3°, 9.7°, 15.2°, 15.6° and 25.4° ± 0.2° 2Θ; a powder XRD pattern as shown in figure Ib; a solid-state ¹³C NMR spectrum with signals at 119.2, 150.3 and 170.6 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 180 ppm of 13.7, 44.8 and 65.1 ± 0.1 ppm; a ¹³C NMR spectrum as depicted in Figures Im and In; and combinations thereof.

2. Sitagliptin sulfate, designated Form S6, characterized by a powder XRD diffractogram shown in figure If.

3. Sitagliptin sulfate isopropanol solvate, designated Form S7, characterized by data selected from: a powder XRD pattern with peaks at 5.2°, 15.6°, 16.6°, 18.7° and 21.1° ±0.2° 2Θ; a powder XRD diffractogram shown in figure Ig; a solid-state ¹³C NMR spectrum with signals at 120.4, 149.1 and 171.2 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 180 ppm of 15.1, 43.8 and 65.9 ± 0.1 ppm; and a 1³C NMR spectrum as depicted in Figures Ii and Ij; and combinations thereof.

4. Sitagliptin sulfate designated Form Sl, characterized by data selected from: a powder XRD pattern with peaks at 11.8°, 13.7°, 14.4°, 17.0° and 17.5° ± 0.2° 2Θ; a powder XRD diffractogram as shown in figure Ia; and combinations thereof

5. Sitagliptin acetate, designated Form El, characterized by data selected from: a powder XRD pattern with peaks at 6.2°, 11.1°, 12.5°, 17.7°, and 18.4° ±0.2° 2Θ; a powder XRD pattern as shown in figure 9a; a solid-state ¹³C NMR spectrum with signals at 122.3, 150.5 and 167.4 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 18.5, 46.7 and 63.6 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures 9c and 9d; and combinations thereof.

6. Sitagliptin L-malate, designated Form II, characterized by data selected from: a powder XRD pattern with peaks at 6.0°, 8.0°, 12.8°, 18.0° and 20.4° ± 0.2° 2Θ; a powder XRD diffractogram shown in figure 4f; a solid-state ¹³C NMR spectrum with signals at 121.7, 150.8 and 173.0 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 17.2, 46.3 and 68.5 ± 0.1 ppm; and a ¹³C NMR spectrum as depicted in Figures 4d and 4e; and combinations thereof.

7. Sitagliptin quinate, designated Form Ql, characterized by data selected from: a powder XRD pattern with peaks at 7.3°, 8.6°, 10.5°, 12.6° and 13.9° ± 0.2° 2Θ; a powder XRD pattern as shown in figure 6a; a solid-state ¹³C NMR spectrum with signals at 121.5, 169.0 and 180.3 ± 0.2 ppm; a solid-state ¹³C NMR spectrum having chemical shifts differences between the signal exhibiting the lowest chemical shift and another in the chemical shift range of 100 to 190 ppm of 16.8, 64.3 and 75.6 ± 0.1 ppm; and a ¹³C NMR spectrum is depicted in Figures 6b and 6c; and combinations thereof.

8. A pharmaceutical composition comprising a crystalline form of any one of claims 1 to 6, and at least one pharmaceutically acceptable excipient.

9. Use of the polymorphs of any one of claims 1 to 7 for the manufacture of a medicament.

10. A method of treating type 2 diabetes mellitus comprising administering an effective amount of a crystalline form of any of claims 1 to 7.