Remote Asymmetric Induction in an Intramolecular Ionic Diels−Alder Reaction: Application to the Total Synthesis of (+)-Dihydrocompactin
作者:Tarek Sammakia、Deidre M. Johns、Ganghyeok Kim、Martin A. Berliner
DOI:10.1021/ja043506g
日期:2005.5.1
The total synthesis of (+)-dihydrocompactin via an intramolecular ionic Diels-Alder reaction that proceeds with remote stereocontrol is described. This reaction proceeds by an intermediate vinyl-oxocarbenium ion (6), the conformational constraints of which lead to the observed asymmetricinduction. The sense of asymmetricinduction appears contrasteric and is explained by the proposed reactive conformation