Palladium-Catalyzed C–H Alkenylation of Arenes Using Thioethers as Directing Groups
作者:Ming Yu、Yongju Xie、Chunsong Xie、Yuhong Zhang
DOI:10.1021/ol3006997
日期:2012.4.20
Thioethers have been proven to be reliable directing groups for palladium catalyzed alkenylation of arenes via C–H activation. Mechanistic investigation reveals that the C–H cleavage of arenes is the turnover-limiting step, and an acetate-bridged dinuclear cyclopalladation intermediate is involved. The alkenylated thioethers can be easily removed and transformed into a variety of useful groups.
硫醚已被证明是通过C–H活化进行钯催化的芳烃链烯基化反应的可靠导向基团。机理研究表明,芳烃的C–H裂解是限制周转的步骤,并且涉及到乙酸酯桥联的双核环palpalladation中间体。烯基化的硫醚可以容易地除去并转化成各种有用的基团。