A Stereoselective Intramolecular 1,3-Dipolar Nitrone Cycloaddition for the Synthesis of Substituted Chromanes
作者:Qian Zhao、Fusen Han、Donna L. Romero
DOI:10.1021/jo011015y
日期:2002.5.1
A stereoselective intramolecular 1,3-dipolar nitrone cycloaddition useful in the synthesis of chromanes is described. The reaction relies on the use of a chiral auxiliary on the nitrone partner. Key to the success of the reaction is the choice of auxiliary and the choice of Lewis acid catalyst. Utilizing an auxiliary with a pendant coordinating group, and Zn(OTf)(2) as the Lewis acid, diastereoselectivities