| 摘要 |
PCT No. PCT/DE90/00329 Sec. 371 Date Mar. 11, 1991 Sec. 102(e) Date Mar. 11, 1991 PCT Filed May 7, 1990 PCT Pub. No. WO90/13558 PCT Pub. Date Nov. 15, 1990.A process is disclosed for the preparation of 21-bromo-4-pregnene-3,20-dione derivatives of general Formula I <IMAGE> (I) wherein R1 is a hydrogen atom, a hydroxy group or an alkanoyl group of up to 6 carbon atoms, R2 symbolizes a hydrogen atom or a methyl group, or wherein R1 and R2 jointly mean an isopropylidenedioxy group, wherein R3 is a hydrogen atom, a fluorine atom or a methyl group, V is a methylene group or ethylene group, X is a hydrogen atom, a fluorine atom or a chlorine atom, and Y is a methylene group, a hydroxymethylene group or a carbonyl group.
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