Formation of Vinyl-, Vinylhalide- or Acyl-Substituted Quaternary Carbon Stereogenic Centers through NHC−Cu-Catalyzed Enantioselective Conjugate Additions of Si-Containing Vinylaluminums to β-Substituted Cyclic Enones
作者:Tricia L. May、Jennifer A. Dabrowski、Amir H. Hoveyda
DOI:10.1021/ja110054q
日期:2011.2.2
generated efficiently by a site-selective hydroalumination of an alkyne with dibal-H. The desired products, containing a quaternarycarbonstereogeniccenter, are obtained in 48-95% yield after purification and in 89:11 to >98:2 enantiomer ratio (er). The vinylsilane moiety within the products can be functionalized to afford acyl, vinyliodide, or desilylated alkenes in 67% to >98% yield and with >90% retention