title: Direct C-H carboxylation with carbon dioxide using 1,2,3-triazol-5-ylidene copper(I) complexes.
abstract: 1,2,3-Triazol-5-ylidene copper(I) complexes (tzNHC-Cu) efficiently catalyzed the direct C-H carboxylation of benzoxazole and benzothiazole derivatives with CO(2) to give the corresponding esters in excellent yields after treatment with alkyl iodide. The tzNHC copper(I) complex, i.e., [(TPr)CuCl], worked somewhat more effectively than the corresponding imidazol-2-ylidene copper(I) complex [(IPr)CuCl] to give the carboxylation product in higher yields.
authors: Department of Applied Chemistry, Institute of Science Engineering, Chuo University, 1-13-27 Kasuga, Tokyo 112-8551, Japan.
authors: Hiroshi
authors: H
authors: Inomata
authors: Kenichi
authors: K
authors: Ogata
authors: Shin-ichi
authors: S
authors: Fukuzawa
authors: Zhaomin
authors: Z
authors: Hou