Combining the [2,3] sigmatropic rearrangement and ring-closing metathesis strategies for the synthesis of spirocyclic alkaloids. A short and efficient route to (±)-perhydrohistrionicotoxin
作者:David Tanner、Lars Hagberg、Anders Poulsen
DOI:10.1016/s0040-4020(98)01115-6
日期:1999.1
This paper describes the use of selenium-based [2,3] sigmatropic rearrangement in combination with ruthenium-catalyzed ring-closing metathesis (RCM) for the synthesis of azaspiro ring systems, as exemplified by the reactions of model substrates 5 and 6. The methodology has been applied to a short and efficient formal total synthesis of the alkaloid (±)-perhydrohistrionicotoxin (2). Thus, (±)-depen
本文描述了基于硒的[2,3]σ重排与钌催化的闭环复分解(RCM)结合用于氮杂螺环系统的合成,以模型底物5和6的反应为例。该方法已应用于生物碱(±)-perhydrohistrionicotoxin(2)的短而有效的正式全合成。因此,在10次实验室操作中由2,3-环氧环己-1--1-酮合成了已知的合成2的关键中间体(±)-戊基过氢组氨酸毒素1,大约在10分钟内即可完成。总产率为20%。合成路线是潜在的对映选择性,和关键步骤是在[2,3]σ迁移重排11至12经由相应的烯丙基硒化物(产率86%)和钌催化RCM 13到14(80%)。