反应详情

Add 13β-ethyl-3-methoxy-gona-2,5(10)-dien-17-one (12.9 g.) with stirring under nitrogen to methanol (300 cc.) containing 11N hydrochloric acid (20 cc) and water (13 cc.). Stir two hours and add sodium bicarbonate (21 g.) portionwise. Filter the mixture and evaporate and filtrate to dryness. Recrystallize the residue from ethyl acetate (75 cc.) to obtain the title compound (10 g.), m.p. 158°-161° C; ultraviolet absorption peak at 240 mμ (ε17,800); infrared absorption peaks at 5.78, 6.00, 6.17 μ.

1. filtrationFilter the mixture
2. customevaporate
3. customRecrystallize the residue from ethyl acetate (75 cc.)