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Crystalline polymorph of sitagliptin phosphate and its preparation

A technology for sitagliptin phosphate and crystal form, which is applied in the field of sitagliptin phosphate crystal form and its preparation, and can solve problems such as unsuitable industrial production of pharmaceutical preparations

Inactive Publication Date: 2010-01-27
MAI DE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Defects of currently known crystals of sitagliptin phosphate make them unsuitable for industrial production of large-scale preparations of pharmaceutical preparations

Method used

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  • Crystalline polymorph of sitagliptin phosphate and its preparation
  • Crystalline polymorph of sitagliptin phosphate and its preparation
  • Crystalline polymorph of sitagliptin phosphate and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Preparation of sitagliptin phosphate crystal form V

[0084] 4.0 g of sitagliptin phosphate was suspended in 50 ml of heated methanol (HPLC, HPLC grade). Add about 10 ml of water to the suspension and heat until all solid matter is dissolved. The resulting solution was cooled to room temperature and recrystallized overnight at 5°C, no crystals formed and precipitated. Recrystallization was continued at -18°C for three days, and the formed crystals were isolated by filtration and dried in a vacuum oven at about 41°C for 7 hours to obtain a white crystalline substance (about 2.5 g). The obtained product was identified by DSC, TGA and X-ray powder diffraction methods. DSC experiments show that the obtained product has an endothermic peak at about 213.27°C, as Figure 4 shown. The X-ray powder diffraction pattern of gained product is as figure 1 shown. The TGA of the resulting product shows that it contains less than about 0.5% moisture (weight percent), as Figure 7...

Embodiment 2

[0086] Preparation of sitagliptin phosphate crystal form V

[0087] 2.5 g of sitagliptin phosphate was suspended in 5 ml of methanol, 5 ml of n-butanone, 4 ml of tetrahydrofuran, 5 ml of acetonitrile, 5 ml of ethanol and 10 ml of dichloromethane (HPLC, HPLC grade) under heating. Add approximately 7 ml of water to the suspension, heat until all solid matter is dissolved, and mix to form a homogeneous solution. The resulting solution was distilled at about 55°C under reduced pressure (about 20 psi). After most of the organic solvent was distilled off, a small amount of white crystalline material formed on the surface of the flask. The white crystalline substance is placed in an aqueous solution to induce recrystallization of sitagliptin phosphate in the solution, and the suspended solution is cooled to room temperature to continue recrystallization, and a large amount of crystals form and precipitate after 20 to 30 minutes. Recrystallization was continued at room temperature f...

Embodiment 3

[0090] Preparation of sitagliptin phosphate crystal form V

[0091] 4.0 g of sitagliptin phosphate was suspended in 50 ml of heated acetone (HPLC, high performance liquid phase grade). About 7 ml of water was added to the suspension, and the suspension was heated until all solid matter was dissolved and a clear homogeneous solution was obtained. The resulting solution was cooled to room temperature and recrystallized overnight at 5°C, no crystals formed and precipitated. Recrystallization was continued at -18°C for three days, and the formed crystals were isolated by filtration and dried in a vacuum oven at about 41°C for 24 hours to obtain a white crystalline substance (about 2.0 g). The obtained product was identified by DSC and X-ray powder diffraction methods. DSC experiment shows that the obtained product has an endothermic peak at about 211.97°C. The X-ray powder diffraction pattern of gained product is as figure 1 or figure 2 shown.

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Abstract

The present invention is directed to a novel polymorph form of crystalline sitagliptin phosphate, named as Form V herein. The present invention further provides processes for preparations of Form V, pharmaceutical composition comprising Form V and its use in therapy. Form V can be prepared from recrystallizing sitagliptin phosphate in a mixture of methanol and water, a mixture of acetone and water, or from distillation of a mixture of organic solvents and water followed by recrystallization in the remaining aqueous solution.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 072107, filed March 28, 2008, which is incorporated herein by reference in its entirety. field of invention [0003] The invention relates to a novel crystal form of sitagliptin phosphate and a preparation process thereof, a pharmaceutical preparation containing the crystal form of sitagliptin phosphate and its application in treatment. Background technique [0004] The chemical name of sitagliptin phosphate is (2R)-4-oxo-4-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3- α]pyrazin-7(8H)yl]-1-(2,4,5-trifluorophenyl)butyl-2-aminophosphonate, which has the chemical structure shown below: [0005] [0006] Sitagliptin has been disclosed in International Patent Application WO 03 / 004498 and US Patent US 6,699,871. US patent application US 2005 / 0032804 discloses sitagliptin phosphate. Sitagliptin or sitagliptin phosphate is a new type of hypoglyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D487/04A61K31/4985A61P3/10A61P5/50A61P3/04A61P9/12A61P43/00
CPCC07D487/04
Inventor 黄才古何慧敏
Owner MAI DE
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