Palladium(II)-Catalyzed Direct Alkenylation and Arylation of Arenes: Removable 2-Pyridylsulfinyl Group Assisted C–H Bond Activation
作者:Ming Yu、Zunjun Liang、Yongyong Wang、Yuhong Zhang
DOI:10.1021/jo200666z
日期:2011.6.17
Palladium-catalyzed C–H activation reactions directed by a removable 2-pyridylsulfinyl group were developed. Aromatic olefination products were formed in good yields on treatment of 2-(phenylsulfinyl)pyridines with alkenes in the presence of a Pd catalyst. The reaction tolerates a wide range of substituted alkenes, including various acrylates and styrenes. The controlled experiments indicated that
钯催化的可移动的2-吡啶基亚磺酰基基团引起的CH活化反应得以开发。在Pd催化剂存在下,用烯烃处理2-(苯基亚磺酰基)吡啶,以高收率形成芳族烯烃化产物。该反应可耐受各种取代的烯烃,包括各种丙烯酸酯和苯乙烯。对照实验表明2-吡啶基部分而不是亚磺酰基起配体的作用。最终的还原性脱磺酰化分别提供了具有不同还原条件的对苯二甲酸酯,硫化物和二硫化物。更重要的是,这种转换也可以通过双重C–H激活而应用于芳基化反应中。