An alpha-Diaminoboryl Carbanion Assisted Stereoselective Single-Pot Preparation of alpha,beta-Disubstituted Acrylonitriles

[摘要]：An alpha-diaminoboryl carbanion-mediated one-pot olefination directly converts an acetonitrile or the homologous nitrile into a series of alpha,beta-disubstituted acrylonitriles in a stereoselective manner. The protocol involves the formation of an alpha-substituted alpha-diaminoboryl acetonitrile and subsequent olefination with an aldehyde. The use of an aryl or conjugated aldehyde preferentially leads to a (Z)-acrylonitrile, while an aliphatic aldehyde gave an (E)-isomer as a major product. Two complementary approaches, a linear method and a divergent method, are developed.

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