Method for preparing high-purity thalidomide alpha crystal form

A technology of thalidomide and its crystal form, which is applied in the field of preparation of high-purity thalidomide α crystal form, and can solve the problems of difficult reuse of mother liquor, high social and economic costs, etc.

Active Publication Date: 2019-11-26
CINKATE PHARMA INTERMEDIATES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all need to use polar solvents with high boiling points, as well as solvents such as ketones and alcohols. The mother liquor after crystallization is very difficult to reuse, and the social and economic costs are relatively high.

Method used

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  • Method for preparing high-purity thalidomide alpha crystal form
  • Method for preparing high-purity thalidomide alpha crystal form
  • Method for preparing high-purity thalidomide alpha crystal form

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Add 50 g of crude thalidomide and 1,500 g of tetrahydrofuran into a 2L three-neck round bottom flask, stir mechanically, heat the oil bath to reflux, add 150 g of purified water, and dissolve all the solids. Tetrahydrofuran, after recovery of tetrahydrofuran, the mother liquor was cooled to room temperature, vacuum-filtered under reduced pressure, and the filter cake was vacuum-dried at 80°C for 4 hours to obtain 48.5 g of thalidomide crystals, with a recrystallization yield of 97.0% and a purity of 99.8%. The residual amount was almost 0%. DSC test results such as figure 1 As shown, the endothermic peaks detected by DSC are 271.55°C (the characteristic endothermic peak of the alpha crystal form) and 274.17°C, indicating that the obtained thalidomide crystals are in the alpha crystal form and have high purity. X-ray diffraction pattern (XRPD) as Figure 2A As shown, the X-ray diffraction data as Figure 2B shown. The result shows that the obtained product is thalido...

Embodiment 2

[0087] Add 50 g of crude thalidomide and 150 g of tetrahydrofuran into a 500 ml three-necked round-bottomed flask successively, stir mechanically, heat the oil bath to reflux, add 50 g of purified water, and dissolve all the solids, lower the temperature to room temperature and concentrate under reduced pressure to recover tetrahydrofuran, and the recovery of tetrahydrofuran is complete , the mother liquor was suction-filtered, and the filter cake was vacuum-dried at 80° C. for 4 hours to obtain 49.0 g of thalidomide crystal product, the recrystallization yield was 98.0%, the purity was 99.7%, and the residual tetrahydrofuran was almost 0%. DSC test results such as image 3 As shown, the endothermic peaks detected by DSC are 271.47°C and 274.32°C, indicating that the obtained thalidomide crystals are in the alpha crystal form and have high purity. X-ray diffraction pattern (XRPD) as Figure 4A As shown, the X-ray diffraction data are as Figure 4B shown. Also show that the ...

Embodiment 3

[0089] Thalidomide crude product 50g, tetrahydrofuran recovered in Example 1 was weighed 1500g and added to a 2L three-necked round-bottomed flask successively, mechanically stirred, the oil bath was heated to reflux, 150g of purified water was added, all the solids were dissolved, and the mixture was reduced to Concentrate under reduced pressure at room temperature to recover tetrahydrofuran. After the recovery of tetrahydrofuran is complete, the mother liquor is suction-filtered, and the filter cake is vacuum-dried at 80°C for 4 hours to obtain 48.8 g of thalidomide crystals. The recrystallization yield is 97.6%, the purity is 99.8%, and tetrahydrofuran remains amount is almost 0%. DSC test results such as Figure 5 As shown, the endothermic peaks detected by DSC are 271.31°C (the characteristic endothermic peak of the alpha crystal form) and 274.23°C, indicating that thalidomide is in the alpha crystal form and has high purity. X-ray diffraction pattern (XRPD) as Figure ...

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Abstract

The invention relates to a method for preparing a high-purity thalidomide alpha crystal form, and in particular to alpha crystal form thalidomide prepared by using the method provided by the invention. In addition, an organic solvent used in the method provided by the invention can be repeatedly used through distillation recycling, the crystallization yield is 95% or greater, and the method is simple in operation and green and environment-friendly, and has high economic and social value. By adopting the process of the method, industrial large-scale production can be easily achieved.

Description

technical field [0001] The invention belongs to the technical field of medicine, in particular to a preparation method of high-purity thalidomide α crystal form. Background technique [0002] Thalidomide (Distaval) is a synthetic glutamic acid derivative, alias: thalidomide, reaction stop, thalidomide, thalidomide, thalidomide, thalidomide Ketones, whose structural formula is as follows: [0003] [0004] The document J.CHEM.SOC.PERKIN TRANS.2 1994 (2063-2067) studied the crystal form of thalidomide, and found that there are two crystal forms of thalidomide, namely α crystal form and β crystal form, Differential scanning calorimetry (DSC) was used to detect that the α crystal form had an endothermic peak at 271.5-273.0°C, and the β crystal form only had an endothermic peak at 275.0-276.5°C. It is believed that the α crystal form will have an endothermic peak during the DSC detection process. Part or all of it is transformed into the β crystal form, so that the endotherm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D401/04
CPCC07B2200/13C07D401/04
Inventor 文勇王果仇波肖飞
Owner CINKATE PHARMA INTERMEDIATES
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