Title:
THE PROCESS FOR PREPARING TAMIBAROTENE II TYPE CRYSTAL
Document Type and Number:
WIPO Patent Application WO/2009/114966
Kind Code:
A1
Abstract:
The process for preparing tamibarotene II type crystal of a single heat-absorptive peak near 233 oC in differential scanning thermal analysis. The process comprises the following steps: using low carbon organic acids (preferred acetic acid or formic acid or their combination) or low carbon organic acids water solution to crystallize random crystal or amorphous tamibarotene solid to obtain pure tamibarotene II crystal. The method does not need high temperature transition process of more than 180 oC which is easy to cause degradation.
Inventors:
SUN PIAOYANG (CN)
CHEN YONGJIANG (CN)
LI YURU (CN)
YU GUANGLIANG (CN)
CHEN YONGJIANG (CN)
LI YURU (CN)
YU GUANGLIANG (CN)
Application Number:
PCT/CN2008/070537
Publication Date:
September 24, 2009
Filing Date:
March 19, 2008
Export Citation:
Assignee:
JIANGSU HENGRUI MEDICINE CO (CN)
SUN PIAOYANG (CN)
CHEN YONGJIANG (CN)
LI YURU (CN)
YU GUANGLIANG (CN)
SUN PIAOYANG (CN)
CHEN YONGJIANG (CN)
LI YURU (CN)
YU GUANGLIANG (CN)
International Classes:
C07C233/65; C07C231/24
Foreign References:
| CN101200435A | 2008-06-18 | |||
| CN1449376A | 2003-10-15 | |||
| US5214202A | 1993-05-25 |
Attorney, Agent or Firm:
GE CHENG & CO., LTD. (WeiLevel 19, Tower E3, The Towers,Oriental Plaza,No.1, East Chang An Avenue, Beijing 8, CN)
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