Asymmetric Conjugate Addition of Alkylzirconium Reagents to α,β-Unsaturated Lactones
作者:Eleanor E. Maciver、Rebecca M. Maksymowicz、Nancy Wilkinson、Philippe M. C. Roth、Stephen P. Fletcher
DOI:10.1021/ol501292x
日期:2014.6.20
The asymmetric synthesis of β-substituted lactones by catalytic asymmetric conjugate addition of alkyl groups to α,β-unsaturatedlactones is reported. The method uses alkylzirconium nucleophiles prepared in situ from alkenes and the Schwartz reagent. Enantioselective additions to 6- and 7-membered lactones proceed at rt, tolerate a wide variety of functional groups, and are readily scalable. The method