Process for the preparation of 4-androstene-3,17-dione derivatives
申请人:Schering Aktiengesellschaft
公开号:US04100027A1
公开(公告)日:1978-07-11
A process for the preparation of 4-androstene-3,17-dione derivatives of the formula ##STR1## wherein X is 6,7-methylene or fluoro, chloro, or methyl in the 6- or 7-position, comprises fermenting a sterol of the formula ##STR2## wherein X is as above and R.sub.1 is a hydrocarbon residue of 8-10 carbon atoms with a microorganism culture capable of degrading the side chain of a sterol.
Fission of 3β-acetoxy-5α-,6α-epoxides in the cholestane, androstane and pregnane series with boron trifluoride etherate afforded the corresponding 3β-acetoxy-5α-hydroxy-6β-fluoro compounds. By appropriate manipulation of these fluorohydrins 6α-fluorocholestenone and the biologically interesting 6α- and 6β-fluorotestosterone and 6α- 6β-fluoroprogesterone were prepared.