Studies of neodolastanes — Synthesis of the tricyclic core of the trichoaurantianolides
作者:David R. Williams、Joseph R. Pinchman
DOI:10.1139/v2012-088
日期:2013.1
the synthesis of trichoaurantianolide C (5) are described. Stille cross-coupling reactions of (E)- and (Z)-β-stannyl-α,β-unsaturated esters with allylic acetate 32 provide for the stereocontrolled formation of nonconjugated 2,5-diene-1-ols. Studies of the asymmetric Sharpless epoxidation are utilized to establish diastereofacial selectivity for the preparation of a crucial C2 tertiary allylic alcohol
描述了对 trichoaurantianolide C (5) 合成的研究。(E)- 和 (Z)-β-甲锡烷基-α,β-不饱和酯与乙酸烯丙酯 32 的 Stille 交叉偶联反应提供了非共轭 2,5-二烯-1-醇的立体控制形成。利用对不对称 Sharpless 环氧化的研究来建立非对映选择性,以制备用于随后酯化和闭环复分解的关键 C2 叔烯丙醇。关键丁烯内酯前体 49 的 SmI2 还原环化导致天然产物三环核心的中心七元环的形成。