Highly Regio- and Stereoselective Palladium(0)-Catalyzed Addition of Organoboronic Acids with 1,2-Allenic Sulfones, Sulfoxides, or Alkyl- or Aryl-Substituted Allenes in the Presence of Acetic Acid: An Efficient Synthesis of <i>E</i>-Alkenes
作者:Shengming Ma、Hao Guo
DOI:10.1055/s-2007-983822
日期:2007.9
reaction conditions were established to enable the palladium(0)-catalyzed addition of organoboronic acids with 1,2-allenic sulfones, sulfoxides, or alkyl- or aryl-substituted allenes in the presence of acetic acid. This reaction provides a new way for the stereoselective synthesis of tri- or tetrasubstituted E-alkenes. With arylboronic acids, the reactions of 1,2-allenic sulfones, sulfoxides, and alkyl-substituted
建立了两组反应条件以使有机硼酸与 1,2-丙二烯砜、亚砜或烷基或芳基取代的丙二烯在乙酸存在下的加成反应成为可能。该反应为立体选择性合成三取代或四取代的E-烯烃提供了新途径。对于芳基硼酸,1,2-丙二烯砜、亚砜和烷基取代丙二烯的反应仅产生 1-12% 的特定区域异构体;芳基取代的丙二烯的反应仅提供了非常高区域选择性的 E-烯烃。