A visible-light-induced decarboxylative trifluoromethylation of alpha,beta-unsaturatedcarboxylicacids, which uses the Togni reagent as the CF3 source is disclosed. The corresponding trifluoromethylated alkenes were obtained in moderate to high yields with excellent functional group tolerance at ambient temperature. Preliminary mechanistic analyses suggest a radical-type mechanism.
An efficient decarboxylative trifluoromethylation of α,β-unsaturated carboxylic acids using the Langlois reagent as a trifluoromethyl precursor has been achieved by an electro-oxidative strategy. Under catalyst-free and external oxidant-free electrolysis conditions, a series of Cvinyl-CF3 compounds are obtained with a high regioselectivity in good yields. The successful trapping of the CF3 radical
An efficient method for the iron(III) porphyrincatalyzed olefination of various aldehydes with 2,2,2‐trifluorodiazoethane (CF3CHN2) under neutral conditions has been developed. This reaction is an important supplement to the synthetic applications of CF3CHN2.
Synthesis of CF<sub>3</sub>-Substituted Olefins by Julia-Kocienski Olefination Using 2-[(2,2,2-Trifluoroethyl)sulfonyl]benzo[<i>d</i>]thiazole as Trifluoromethylation Agent
作者:Andreas Hafner、Tobias S. Fischer、Stefan Bräse
DOI:10.1002/ejoc.201301070
日期:2013.12
A modified Julia–Kocienski protocol was investigated for the synthesis of CF3-substituted terminal olefins. By employing a simple one-step procedure, aldehydes were converted into the corresponding CF3-substitutedolefinsusing2-[(2,2,2-trifluoroethyl)sulfonyl]benzo[d]thiazole as the trifluoromethylationagent. This sulfone was prepared on a gram scale in two steps from inexpensive and commercially