[4+3] Cycloadducts from Lewis Acid Mediated Reactions of Acroleins with Cyclopentadiene

摘要

More than 20 years ago Sasaki et al.reported the Lewis acid promoted cycloaddition of 2-silyloxyacrolein to cyclo-pentadiene,which led to the isolation of the diastereomeric [4+3] Cycloadducts la and 1beta (Scheme 1).A variation of the silyl substituent and of the Lewis acid made little difference (Scheme 1),although starting materials and products were,of course,easier to handle.