Studies toward the Synthesis of (+)-Palustrine: The First Asymmetric Synthesis of (−)-Methyl Palustramate
作者:Steven R. Angle、Robert M. Henry
DOI:10.1021/jo980749g
日期:1998.10.1
(+)-palustrine, is described. The key step of the synthesis is a conformationally restricted Claisen rearrangement to afford the highly functionalized 1-benzylpipecolic ester 10. In addition, a new procedure for debenzylation of 1-benzylpiperidines (Li, (NH(2)CH(2))(2), Et(3)N, THF) was used to remove the benzyl protecting group where traditional methods failed.
描述了(-)-甲基戊酸酯的立体选择性合成,这是合成(+)-芦丁碱的可能中间体。合成的关键步骤是构象受限的克莱森重排,以提供高度官能化的1-苄基哌酸酯10。此外,1-苄基哌啶(Li,(NH(2)CH(2))(2 ),Et(3)N,THF)用于除去传统方法失败的苄基保护基。