Formal Enantioselective [4+3] Cycloaddition by a Tandem Diels–Alder Reaction/Ring Expansion
作者:Xing Dai、Huw M. L. Davies
DOI:10.1002/adsc.200600363
日期:2006.11
expansion between cyclopentadiene and unsaturated aldehydes is a highly stereoselective process for the synthesis of bicyclo[3.2.1]octenones, the formalproducts of a [4+3] cycloaddition. When the initial cycloaddition was conducted in the presence of the chiral Lewis acid catalyst 14, the bicyclo[3.2.1]octenones were obtained in two steps in 72–85 % yields with up to 96 % ee and>98 % de.