| 摘要 |
This invention describes the new 17-difluoromethylene-estratrienes of general formula I in which R1 is a hydrogen atom or a C1-C10 alkyl group, R5 is a methyl or ethyl group, and R2 is a hydrogen atom or a C1-C10 alkyl group in alpha - or beta -position, R3 is a hydrogen atom or a C1-C10 alkyloxy group in alpha - or beta -position, R4 is a hydrogen atom in alpha - or beta -position, and A, B, D, E and G each is a hydrogen atom, and optionally at least one of substituent pairs G and R2, R2 and R4, R4 and A, A and R3, B and D, D and E is a double bond.
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