Novel Nucleophilic Heterocyclic Carbene Mediated Stereoselective Conjugate Addition of Enals to Nitrostyrenes via Homoenolate
摘要:
A stereoselective Michael addition of homoenolate, generated from enals by nucleophilic heterocyclic carbene (NHC) catalysis, to beta-nitrostyrenes is reported for the first time. The products of this reaction obtained in good yields are of potential value in the synthesis of a variety of acyclic and heterocyclic compounds.
N-Heterocyclic Carbene Catalyzed Homoenolate-Addition Reaction of Enals and Nitroalkenes: Asymmetric Synthesis of 5-Carbon-Synthon δ-Nitroesters
作者:Biswajit Maji、Li Ji、Siming Wang、Seenuvasan Vedachalam、Rakesh Ganguly、Xue-Wei Liu
DOI:10.1002/anie.201203449
日期:2012.8.13
Synthesizing synthons: The highly enantioselective title reaction is described. It employs catalytic amounts of N‐heterocyclic carbene precursors and transforms a broad range of nitroalkenes, such as nitrodienes, nitroenynes, and nitrostyrenes, through reaction with a broad range of enals, into δ‐nitroesters via homoenolate intermediates (see scheme).