发明授权
US4061661A .DELTA..sup.9(11) -5.alpha.-20-KETO STEROIDS AND PROCESS FOR THEIR
PRODUCTION
失效
{66 {HU 9(11){B -5 {60 -20-KETO STEROIDS AND PROCESS FOR PRODUCRECTION
- 专利标题: .DELTA..sup.9(11) -5.alpha.-20-KETO STEROIDS AND PROCESS FOR THEIR PRODUCTION
- 专利标题(中): {66 {HU 9(11){B -5 {60 -20-KETO STEROIDS AND PROCESS FOR PRODUCRECTION
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申请号: US693848申请日: 1976-06-08
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公开(公告)号: US4061661A公开(公告)日: 1977-12-06
- 发明人: Rudolf Wiechert , Ulrich Kerb , Otto Engelfried
- 申请人: Rudolf Wiechert , Ulrich Kerb , Otto Engelfried
- 申请人地址: DT Berlin and Bergkamen
- 专利权人: Schering Aktiengesellschaft
- 当前专利权人: Schering Aktiengesellschaft
- 当前专利权人地址: DT Berlin and Bergkamen
- 优先权: DT2526373 19750611
- 主分类号: C07J7/00
- IPC分类号: C07J7/00 ; C07J1/00
摘要:
3.alpha.-Hydroxy and 3.alpha.-acyloxy- .DELTA..sup.9(11) -5.alpha.-20-ketopregnenes of the formula ##STR1## wherein R is hydrogen or acyl, R.sub.1 is hydrogen or methyl and R.sub.2 is methyl or ethyl, are produced by esterifying a corresponding 3.beta.-hydroxy-5.alpha.-20-keto pregnane of the formula ##STR2## wherein R.sub.1 and R.sub.2 have the values given above, with m-iodobenzoic acid with inversion of the 3.beta.-oxy group to a 3.alpha.-oxy group; chlorinating the thus-produced 3.alpha.-m-iodobenzoyl ester with dichloroiodobenzene under irradiation; and treating the reaction product with a dehydrohalogenating silver salt. Optionally thereafter, the 3.alpha.-iodobenzoyl group is split off in a conventional manner to produce the corresponding 3.alpha.-hydroxy steroid and optionally the thus-produced 3.alpha.-hydroxy steroid is esterified to produce a desired 3-ester thereof.
公开/授权文献
- US5642826A Collapsible container 公开/授权日:1997-07-01
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