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 directinggroups 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.
Controllable Mono-/Dialkenylation of Benzyl Thioethers through Rh-Catalyzed Aryl CH Activation
作者:Xi-Sha Zhang、Qi-Lei Zhu、Yun-Fei Zhang、Yan-Bang Li、Zhang-Jie Shi
DOI:10.1002/chem.201300829
日期:2013.9.2
Under solvent control: Benzylthioethers were alkenylated in excellent yields with broad substrate scope and the selectivity (mono‐ vs. disubstituted product) was controlled by the solvent and ratio of reactants (see scheme). Sequential alkenylation with two different alkenes was also carried out in a one‐pot process. In addition, the thioether directing group was removed in a one‐pot process with