Total Synthesis of Pinnamine and Anatoxin-a via a Common Intermediate. A Caveat on the Anatoxin-a Endgame
作者:Thomas Hjelmgaard、Inger Søtofte、David Tanner
DOI:10.1021/jo0506682
日期:2005.7.1
This paper describes the total synthesis of the naturally occurring alkaloids pinnamine (1) and anatoxin-a (2) from a common enantiomerically pure intermediate (7) easily available from pyroglutamic acid. The synthesis of enantiopure pinnamine proceeded in 10 steps and 4.8% overall yield, and the route was flexible enough to allow stereocontrolled access to a non-natural congener (5-epi-pinnamine)
本文描述了天然存在的生物碱pinnamine(的全合成1)和类毒素-A(2从公共对映体纯中间体()7容易从焦谷氨酸)。对映体纯品己胺的合成分10步进行,总收率为4.8%,而且路线灵活,足以立体控制进入天然产物的非天然同类物(5-表位-哌啶胺)。N-酰基亚胺离子的分子内反应是品尼明和抗毒素-α合成的关键步骤。然而,与文献先例形成鲜明对比的是,在氮的反应过程中观察到完全消旋-酰基亚胺离子导致后者的生物碱。