Direct Site-Specific and Highly Enantioselective γ-Functionalization of Linear α,β-Unsaturated Ketones: Bifunctional Catalytic Strategy
作者:Dongxu Yang、Linqing Wang、Fengxia Han、Depeng Zhao、Bangzhi Zhang、Rui Wang
DOI:10.1002/anie.201301146
日期:2013.6.24
α, β, γ: The title method employs a Mg/L catalyst, which is well suited for the selective γ deprotonation and activation of linearα,β‐unsaturated ketones for reaction with nitroalkenes. The reaction leads to a series of optically active cyclohexene ring systems bearing multiple functional groups, systems which are not easily accessible using other methodologies.
Al and friends: Asymmetricconjugateaddition of Me3Al to β,β‐disubstituted α,β‐unsaturated ketones in the presence copper and L1 leads to a highly efficient construction of an all‐carbon‐substituted chiral quaternarycenter. This result is the first example of an asymmetricconjugateaddition of Me3Al to acyclic enones to give a chiral quaternary carbon center with excellent yield and enantioselectivity