Asymmetric Synthesis of Crispine A: Constructing Tetrahydroisoquinoline Scaffolds Using Pummerer Cyclizations
作者:Sateesh Chandra Kumar Rotte、Amar G. Chittiboyina、Ikhlas A. Khan
DOI:10.1002/ejoc.201300748
日期:2013.10
first time, a concise, linear and stereoselective synthesis of both enantiomers of the natural product crispine A has been achieved in six steps with an overall yield of ≥ 20 %, starting from commercially available veratraldehyde. Asymmetric Keck allylation and trifluoroacetic anhydride-mediated Pummerer cyclization were the key transformations used to construct the tetrahydroisoquinoline core structure
从市售的藜芦醛开始,首次通过六个步骤实现了天然产物脆饼 A 的两种对映异构体的简洁、线性和立体选择性合成,总产率≥20%。不对称 Keck 烯丙基化和三氟乙酸酐介导的 Pummerer 环化是用于构建四氢异喹啉核心结构的关键转化。