Copper-Mediated Trifluoromethylation of α-Diazo Esters with TMSCF<sub>3</sub>: The Important Role of Water as a Promoter
作者:Mingyou Hu、Chuanfa Ni、Jinbo Hu
DOI:10.1021/ja307058c
日期:2012.9.19
Copper-mediatedtrifluoromethylation of α-diazo esters with TMSCF(3) reagent has been developed as a new method to prepare α-trifluoromethyl esters. This trifluoromethylation reaction represents the first example of fluoroalkylation of a non-fluorinated carbene precursor. Water plays an important role in promoting the reaction by activating the "CuCF(3)" species prepared from CuI/TMSCF(3)/CsF (1.0:1
Exclusive Aromatic vs Aliphatic C–H Bond Functionalization by Carbene Insertion with Gold-Based Catalysts
作者:Ivan Rivilla、B. Pilar Gómez-Emeterio、Manuel R. Fructos、M. Mar Díaz-Requejo、Pedro J. Pérez
DOI:10.1021/om200206m
日期:2011.5.23
The direct functionalization of aromatic C–H bonds by carbeneinsertion from diazo compounds catalyzed by gold complexes with N-heterocyclic ligands is described. The reaction is completely selective toward the Csp2–H bonds, other Csp3–H bonds remaining unreacted. A study with several NHC ligands in Au(I) and Au(III) complexes has been performed. The potential application of this strategy to give profen