Asymmetric Synthesis of Highly Substituted β-Lactones through Oxidative Carbene Catalysis with LiCl as Cooperative Lewis Acid
作者:Srikrishna Bera、Ramesh C. Samanta、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.201405200
日期:2014.9.1
The reaction of enals with β‐diketones, β‐ketoesters, and malonates bearing a β‐oxyalkyl substituent at the α‐position by oxidativeNHCcatalysis to provide highly substituted β‐lactones is described. Reactions occur with excellent diastereo‐ and enantioselectivity. The organo cascade comprises two CC bond formations and one CO bond formation. Up to four contiguous stereogenic centers including two