A convenient access to 16-methylene and 16β-methyl corticosteroids by a novel transformation of geminal bis(phenylsulphinyl) intermediates
摘要:
16-alpha-Bis(phenylsulphinyl) methyl pregnane derivative 7 gives, by a series of eliminations and rearrangements, the corresponding 16-methylene intermediate 4 on heating in the presence of triphenylphosphine. Regio- and stereoselective hydrogenation of the latter using Wilkinson's catalyst furnishes 16-beta-methyl corticosteroid 5.
A convenient access to 16-methylene and 16β-methyl corticosteroids by a novel transformation of geminal bis(phenylsulphinyl) intermediates
摘要:
16-alpha-Bis(phenylsulphinyl) methyl pregnane derivative 7 gives, by a series of eliminations and rearrangements, the corresponding 16-methylene intermediate 4 on heating in the presence of triphenylphosphine. Regio- and stereoselective hydrogenation of the latter using Wilkinson's catalyst furnishes 16-beta-methyl corticosteroid 5.