The Formal [4+3] Cycloaddition between Donor−Acceptor Cyclobutanes and Nitrones
作者:Andrew C. Stevens、Cory Palmer、Brian L. Pagenkopf
DOI:10.1021/ol200220d
日期:2011.3.18
The formal [4+3] cycloaddition of 2-alkoxy-1,1-dicarboxylate activated donor -acceptor cyclobutanes with nitrones Is disclosed. The reaction forms structurally unique oxazepines in moderate to high yield with a wide scope of nitrones. In most cases either a diastereomeric mixture or a single diastereomer may be formed, depending on the reaction conditions.