发明授权
- 专利标题: Method for preparing 17 .alpha.-ester-21-halo pregnanes
- 专利标题(中): 制备17 {60-二酯-2-卤代孕烷的方法
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申请号: US671693申请日: 1976-03-29
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公开(公告)号: US4113680A公开(公告)日: 1978-09-12
- 发明人: Yoshiaki Kamano , Kazuhiko Michishita , Teruya Seki , Ichiro Tanaka
- 申请人: Yoshiaki Kamano , Kazuhiko Michishita , Teruya Seki , Ichiro Tanaka
- 申请人地址: JP Tokyo
- 专利权人: Taisho Pharmaceutical Co., Ltd.
- 当前专利权人: Taisho Pharmaceutical Co., Ltd.
- 当前专利权人地址: JP Tokyo
- 优先权: JP50-38914 19750331; JP50-52085 19750501
- 主分类号: C07J7/00
- IPC分类号: C07J7/00 ; C07J71/00 ; C07J5/00
摘要:
One-step method for preparing 17 .alpha.-ester-21-halo pregnanes by reacting 17 .alpha., 21-cyclic orthoesters of 17 .alpha., 21-dihydroxy pregnanes with a halo compound in the presence of an organic polar solvent, simultaneously resulting in halogenation at 21-position and esterification at 17 .alpha.-position of said 17 .alpha., 21-cyclic orthoesters, the reaction proceeding in a short period of time without, or substantially without, any unfavorable side-reactions.
公开/授权文献
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