About the Leuckart reaction of chiral 2-norbornanones bearing electron-withdrawing groups: reaction of bridgehead triflates and triflamides
作者:Antonio Garcı́a Martı́nez、Enrique Teso Vilar、Amelia Garcı́a Fraile、Paloma Martı́nez-Ruiz
DOI:10.1016/s0040-4020(03)00037-1
日期:2003.2
The mechanism of the Leuckart reaction of 3,3- and 7,7-dimethyl-2-oxo-1-norbornyl triflates and triflamides, synthesised by us starting from (1R)-camphor and (1R)-fenchone, has been studied. Strikingly, the electron-withdrawing capacity of the bridgehead substituents has demonstrated not to be enough to control the Wagner–Meerwein rearrangement during the course of the reaction, so that only both enantiomers
由我们从(1 R)-樟脑和(1 R)-芬琴酮开始合成的3,3-和7,7-二甲基-2-氧代-1-降冰片基三氟甲磺酸酯和三氟化物的Leuckart反应机理一直是研究过。令人惊讶的是,桥头取代基的吸电子能力已证明不足以控制反应过程中的Wagner-Meerwein重排,因此最终仅获得了3,3-二甲基降冰片烷二胺衍生物的两种对映体。 。结果,这些有趣的手性化合物的总合成已得到优化,并缩短到从(1 R)-甲ench酮开始的三个总步骤。