Title:
NEW PREPARATION METHOD OF 5,7-PREGNADIENE-3,20-DIONE-DIETHYL KETAL
Document Type and Number:
WIPO Patent Application WO/2013/078575
Kind Code:
A8
Abstract:
Disclosed is a preparation method of 5,7-pregnadiene-3,20-dione-diethyl ketal. The preparation method comprises: performing dehydration condensation on progesterone by using glycol to protect two carbonyls, so as to obtain a compound B; performing allylic selective oxidization on the compound B to obtain a compound D; performing condensation on the compound D and p-toluenesulfonhydrazide, so as to obtain a compound E; and performing a Shapiro reaction to remove hydrazone from the compound E, so as to obtain 5,7-pregnadiene-3,20-dione-diethyl ketal (a compound A).
Inventors:
ZHANG JIANSHE (CN)
WANG CHENLIN (CN)
CHEN JIGU (CN)
WANG CHENLIN (CN)
CHEN JIGU (CN)
Application Number:
PCT/CN2011/002022
Publication Date:
July 18, 2013
Filing Date:
December 02, 2011
Export Citation:
Assignee:
TAIZHOU HISOUND CHEMICAL COMPANY LTD (CN)
ZHANG JIANSHE (CN)
WANG CHENLIN (CN)
CHEN JIGU (CN)
ZHANG JIANSHE (CN)
WANG CHENLIN (CN)
CHEN JIGU (CN)
International Classes:
C07J21/00
Attorney, Agent or Firm:
BEIJING ZHONGYUAN HUAHE INTELLECTUAL PROPERTY AGENCY CO., LTD (Huibin BuildingTower A No.8, Beichendong Street,Chaoyang District, Beijing 1, CN)
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