Stereoselective synthesis of the brassinolide side chain; novel syntheses of brassinolide and related compounds
作者:Zhou Wei-shan、Jiang Biao、Pan Xin-fu
DOI:10.1016/s0040-4020(01)85457-0
日期:1990.1
A stereoselectivesynthesis of the brassinolide side chain involves the lactonization of Z-10 under acidic condition to give an α,β-unsa-turated-δ-lactone 11 with the inversion of the configuration at C-22 of the epoxy steroid in quantitative yield. The 22R,23R,24S-γ-hydroxy-δ-lactone 14 was used as key intermediate for the syntheses of brassinolide(1), homobrassinolide(2), and typhasterol(4) as well