Synthesis of 23-ketocholestane derivatives with different side-chain lengths (asterosapogenin analogs)
摘要:
Syntheses were developed for 23-ketoasterosapogenin analogs with various side-chain lengths from dimethyl(tert-butyl)silyloxypregnenolone (DMTBS-pregnenolone) through 20-hydroxy-23-carboxylates or 22-acetylenic (C5, C6) derivatives by reduction and allylic rearrangement with concurrent oxidation of the intermediate 23-hydroxy-27-nor- and 27-nor-26-methylcholestanes.
Synthesis of 23-ketocholestane derivatives with different side-chain lengths (asterosapogenin analogs)
摘要:
Syntheses were developed for 23-ketoasterosapogenin analogs with various side-chain lengths from dimethyl(tert-butyl)silyloxypregnenolone (DMTBS-pregnenolone) through 20-hydroxy-23-carboxylates or 22-acetylenic (C5, C6) derivatives by reduction and allylic rearrangement with concurrent oxidation of the intermediate 23-hydroxy-27-nor- and 27-nor-26-methylcholestanes.