BRIDGE-CONTAINING ESTRATRIENES Russian patent published in 1997 - IPC

FIELD: organic chemistry, steroids. SUBSTANCE: product: estratriens containing 14α, 17α-bridge of the general formula: (I) where: if OR³ at α-position then R¹, R² and R³ independently each of other is H, acyl-C₁-C₂; or R¹ - benzyl or C₁-C₈-alkyl; if OR³ at β-position then R¹, R² and R³ independently each of other - H, C₁-C₁₂-acyl or C₁-C₈-alkyl. At both cases A-B - etheno- or ethano-bridge. Synthesized compounds were used for synthesis of drugs. EFFECT: improved method of synthesis. 12 cl, 1 tbl, 1 dwg