A Sulfinyl-Directed Asymmetric [5C + 2C] Intramolecular Acetoxypyranone−Alkene Cycloaddition
作者:Fernando López、Luis Castedo、José L. Mascareñas
DOI:10.1021/ol026633v
日期:2002.10.1
the latter to 3-oxidopyrylium ylide precursors. The cycloadducts can be readily desulfinylated to afford enantiomerically pure oxa-bridged bicyclo[5.3.0]decane ring systems. Theoretical calculations confirm that diastereoselectivity stems from the conformational preferences of the alkenylsulfoxide unit in the transition state of the reaction.