Metal- and Oxidant-Free Alkenyl C−H/Aromatic C−H Cross-Coupling Using Electrochemically Generated Iodosulfonium Ions
作者:Ryutaro Hayashi、Akihiro Shimizu、Jonathan A. Davies、Yu Ishizaki、Chris Willis、Jun-ichi Yoshida
DOI:10.1002/anie.201807592
日期:2018.9.24
transformation consisting of 1) addition of electrochemically generated iodosulfonium ions to vinylarenes to give (1‐aryl‐2‐iodoethoxy)sulfonium ions, 2) nucleophilic substitution by subsequently added aromatic compounds to give 1,1‐diaryl‐2‐iodoethane, and 3) elimination of HI with a base to give 1,1‐diarylethenes was developed. The transformation serves as a powerful metal‐ and chemical‐oxidant‐free method
Branched Arylalkenes from Cinnamates: Selectivity Inversion in Heck Reactions by Carboxylates as Deciduous Directing Groups
作者:Jie Tang、Dagmar Hackenberger、Lukas J. Goossen
DOI:10.1002/anie.201605744
日期:2016.9.5
A decarboxylative Mizoroki–Heck coupling of aryl halides with cinnamic acids has been developed in which the carboxylate group directs the arylation into its β‐position before being tracelessly removed through protodecarboxylation. In the presence of a copper/palladium catalyst, both electron‐rich and electron‐deficient arylbromides and chlorides bearing numerous functionalities were successfully