15 beta-hydroxysteroids (Part V). Steroids of the human perinatal period: the synthesis of 3 beta, 15 beta, 17 alpha-trihydroxy-5-pregnen-20-one from 15 beta, 17 alpha-dihydroxy-4-pregnen-3,20-dione.
A simple three-step synthetic method is reported on the conversion of delta 4-3-ketosteroids to the corresponding 3 beta-hydroxy-delta 5-steroid analogues. 17 alpha-Hydroxy-4-pregnen-3,20-dione (10a) was used as a model to develop a method for the synthesis of 3 beta, 17 alpha-dihydroxy-5-pregnen-20-one (16). The major problem being the synthesis of 3,17 alpha-diacetoxy-3,5-pregnadien-20-one (14) was solved by acetylating using a mixture of acetic anhydride and perchloric acid. The conversion of 15 beta, 17 alpha-dihydroxy-4-pregnen-3, 20-dione (8), product of Penicillium citrinum fermentation, to the desired 3 beta,15 beta,17 alpha-trihydroxy-5-pregnen-20-one (1), is described using a modification of this method. Reaction of 8 with acetic anhydride and perchloric acid in ethyl acetate gave 3,15 beta,17 alpha-triacetoxy-3,5-pregnadien-20-one (17) which on reduction with sodium borohydride gave 5-pregnen-3 beta,15 beta,17 alpha, 20(S + R)-tetrols (18a and 18b); however, reduction of 17 with a mixture of sodium borohydride and potassium bicarbonate gave after basic hydrolysis with methanolic sodium hydroxide the desired product 3 beta,15 beta,17 alpha-trihydroxy-5-pregnen-20-one (1) in good yield (54%).
Joannou
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GE
Department of Metabolic Mass Spectrometry, Royal Prince Alfred Hospital, New South Wales, Sydney Australia.
Reeder
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AY
D006907:17-alpha-Hydroxypregnenolone / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D005260:Female; D006801:Humans; D006908:Hydroxyprogesterones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry / Q000379:methods; D011247:Pregnancy
D006908:Hydroxyprogesterones; D006907:17-alpha-Hydroxypregnenolone; C044305:15,17-dihydroxyprogesterone; C032092:3 beta,15 beta,17 alpha-trihydroxy-5-pregnen-20-one