Phosphine-Catalyzed Asymmetric Synthesis of β-Lactones from Arylketoketenes and Aromatic Aldehydes
作者:Mukulesh Mondal、Ahmad A. Ibrahim、Kraig A. Wheeler、Nessan J. Kerrigan
DOI:10.1021/ol100075m
日期:2010.4.16
In this paper, the development of a chiral phosphine-catalyzed formal [2 + 2] cycloaddition of aldehydes and ketoketenes that provides access to a variety of highly substituted beta-lactones (14 examples) is reported. The BINAPHANE catalytic system displays excellent enantioselectivity (seven examples with ee >= 90%) and high diastereoselectivity favoring formation of the trans-diastereomer (nine examples with dr >= 90:10).