A Combined Vinylogous Mannich/Diels-Alder Approach for the Stereoselective Synthesis of Highly Functionalized Hexahydroindoles
作者:Bettina M. Ruff、Sabilla Zhong、Martin Nieger、Marcel Sickert、Christoph Schneider、Stefan Bräse
DOI:10.1002/ejoc.201100996
日期:2011.11
derivatives is reported. The molecules synthesized are highly functionalized and bear up to six stereogenic centers. We were able to develop a stereoselective route starting from nonchiral commercially available materials. Key steps in the formation of the bicyclic products are an organocatalytic vinylogous Mukaiyama–Mannich and a Diels–Alder reaction. The former uses a 1,1′-bi-2-napthol (BINOL)-based
报道了一种用于形成氢吲哚衍生物的通用策略。合成的分子高度功能化并带有多达六个立体中心。我们能够从非手性市售材料开始开发立体选择性路线。形成双环产物的关键步骤是有机催化乙烯基 Mukaiyama-Mannich 和 Diels-Alder 反应。前者使用基于 1,1'-bi-2-napthol (BINOL) 的手性布朗斯台德酸催化剂来构建第一个立体中心。[4+2] 环加成以高度非对映选择性进行,并提供一种主要的立体异构体,它代表了霉菌毒素 Rostratin B-D 的支架。其他转化包括碘内酯化、Curtius 重排、添加、氧化和还原。