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Microbial hydroxylation of steroids provides a useful mild synthetic method for obtaining access to rare steroids [71]. The cyclopropane ring of the 3 a -5-cyclosteroids is sensitive to a variety of reagents limiting many chemical reactions. The fission of a cyclopropane ring in the presence of an adjacent radical has
provided a probe for enzyme mechanism [72]. Incubation of 6b-hy-droxy-3 a , 5-cycloandrostan-17-one (145) with C. aphidicola [73]for 8 days yielded six metabolites that were identified as14 a -hydroxy-3 a ,5-cycloandrostane-6, 17-dione (145), 3b, 14 a -dihydroxyandrost-5-en-17-one (146), 6b, 14 a -dihydroxy-3 a ,
5-cycloandrostan-17-one (147), 3b, 7 a -dihydroxyandrost-5-en-17-one (148), 3b, 7b-dihydroxyandrost-5-en-17-one (149) and 3b, 5 a , 6b-trihydroxyandrostan-17-one (150) (Scheme 23). Simi-larly, incubation of 3 a , 5-cycloandrostane-6, 17-dione (151) with C. aphidicola [73] yielded 145 and 2 a -hydroxy-3 a , 5-cycloandros-tane-6, 17-dione (152), while 3 a , 5-cycloandrost-6-en-17-one (153) afforded 148 and 6b, 7 a -dihydroxy-3 a , 5-cycloandrostane-17-one (154) with the same fungus [73]. These microbial conversions are shown in Scheme 23.

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bxzc123: ½ð±Ò+75, ·­ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2015-04-27 19:08:00
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