Palladium-Catalyzed Decarboxylative Trifluoroethylation of Aryl Alkynyl Carboxylic Acids
作者:Jinil Hwang、Kyungho Park、Juseok Choe、Hongkeun Min、Kwang Ho Song、Sunwoo Lee
DOI:10.1021/jo5003032
日期:2014.4.4
A trifluoroethylation of alkynes through a palladium-catalyzeddecarboxylativecoupling reaction was developed. When alkynyl carboxylic acids and ICH2CF3 were allowed to react with [Pd(η3-allyl)Cl]2/XantPhos and Cs2CO3 in N,N-dimethylformamide (DMF) at 80 °C for 1 h, the desired products were formed in good yields. This catalytic system showed high functional group tolerance.
Reactions of propargylic halides with trifluoromethyltrimethylsilane in the presence of a catalytic amount of copper(I) thiophene-2-carboxylate (CuTC) have been found to give the corresponding trifluoromethylated products in good to high yields with a high selectivity.
Exploiting the inductive effect of the trifluoromethyl group: regioselective gold-catalyzed hydration of 2,2,2-trifluoroethyl-substituted alkynes
作者:Raphaël Gauthier、Nikolaos V. Tzouras、Steven P. Nolan、Jean-François Paquin
DOI:10.1039/d3cc02034g
日期:——
2-trifluoroethyl-substituted alkynes is highly regioselective, producing β-trifluoromethylketones as major products. This transformation illustrates the strong directing effect of the trifluoromethylgroup, through its inductive effect, in gold-catalyzed addition to alkynes.