Abstract
Pregnane derivatives with different functions on C-18 and C-20 are obtained from the pyrrolinic isomeric steroidal hydroxynitrones 2 and 3 by reaction with sodium borohydride and with acid chlorides. In particular, the benzoylation of hydroxynitrone 3 leads to pregnane-18-al-20-one with the carbonyl group at C-20, protected as its oxime ester. This enables selective oxydation and reduction of the free aldehyde at C-18.
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