A simple chemical method for synthesizing malonyl hemiesters of 21-hydroxypregnanes, potential intermediates in cardenolide biosynthesis
作者:Rodrigo M. Pádua、Reiner Waibel、Serge Philibert Kuate、Pia K. Schebitz、Stefanie Hahn、Peter Gmeiner、Wolfgang Kreis
DOI:10.1016/j.steroids.2007.12.012
日期:2008.4
A simple and versatile method for the chemical synthesis of 21-hydroxypregnane 21-O-malonyl hemiesters which may be important intermediates of cardenolide biosynthesis is described. Starting from commercial beta-methyldigitoxin, acid hydrolysis followed by 3 beta-O-acetylation and ozonolysis with reductive cleavage of the ozonides afforded 3 beta-acetoxy-5 beta-pregnane-14 beta,21-diol-20-one which was finally converted into the target compound by treatment with malonyl chloride. The malonylation protocol was optimized using deoxycorticosterone (DOC) as the pregnane educt. (c) 2007 Elsevier Inc. All rights reserved.