反应详情

Add 3N hydrochloric acid (1 cc.) to a solution of 13β-n-propyl-3-methoxy-gona-2,5(10)-dien-17β-ol (0.61 g.) in boiling methanol (70 cc.) and cool the mixture immediately and allow to stand for 4 1/2 hours. Pour the product into water (300 cc.) and extract the mixture with ether; work up in the usual way to give as residue an amorphous solid (0.6 g.). Crystallize this solid from a mixture of ether and hexane. Take up the resulting solid in benzene (20 cc.) and chromatograph on a column of neutral alumina. Elute the product with ether and recrystallize from a mixture of ether and hexane to obtain 13β-n-propyl-17β-hydroxy-gon-4-en-3-one (0.08 g.), mp. 126°-7°; ultraviolet absorption peak at 240 mμ (ε 15,000); infrared absorption peaks at 2.92, 6.01, 6.20 μ. Evaporation of the mother liquors gives a second, polymorphic, form of the same substance (0.17 g.), m.p. 144°-5°, having ultraviolet and infrared spectra identical with the first material; a mixture of the two forms has m.p. 144°-5°.

1. temperaturecool the mixture immediately
2. customto stand for 4 1/2 hours
3. extractionextract the mixture with ether
4. customwork up in the usual way to give as residue an amorphous solid (0.6 g.)
5. customCrystallize this solid
6. additionfrom a mixture of ether and hexane
7. washElute the product with ether
8. customrecrystallize from a mixture of ether and hexane