摘要:
The title compound was synthesized via the Julia olefination using ring B-diene protected 3-beta-hydroxy-23,24-bisnorchola-5,7-diene-22-al acetate and the side-chain synthon 2-methyl-4-phenylsulfonyl-2-(tetrahydropyranyloxy)butane. Ring B-deprotection, photolysis, Paaren-DeLuca hydroxylation and separation of the 5,6 E and Z stereoisomers completed the synthesis in overall 3% yield.