PROCESS FOR THE PRODUCTION OF 10BETA-H-STEROIDS

摘要

Compounds of general formula (III), in which A and B together stand for an additional bond and D stands for a hydrogen atom or B and D together stand for an additional bond and A stands for a hydrogen atom and Y and Y' each stand for a protect- ed keto group and R1 and R4 have the meaning given in the description, can b e reduced with an electropositive metal, with- out destroying the aromatic system and the 5,6 double bond, to compounds of general formula (IIa), which can be converted to compounds of general formule (Ia) or (Ib) which are useful in the synthes is of antigestagens.