A sustainable FeCl3-mediated method has been developed for the decarboxylativetrifluoromethylation of α,β-unsaturatedcarboxylicacids by using NaSO2CF3 as an economic and stable CF3 source. The reaction proceeds under mild condition and tolerates various functional groups. Advantageously, this method does not require an inert atmosphere and proceeds well in air at ambient temperature.
Phosphine-Relayed Aldehyde-Olefination and Aza-Wittig Reaction with 2,2,2-Trifluorodiazoethane
作者:Fa-Guang Zhang、Ning Lv、Yan Zheng、Jun-An Ma
DOI:10.1002/cjoc.201800158
日期:2018.8
Phosphine‐relayed olefination and aza‐Wittigreactions of readily available aldehydes with 2,2,2‐trifluorodiazoethane (CF3CHN2) have been realized. This protocol enables the facile construction of a series of trifluoromethylated alkenes and hydrazones in good to high yield under mild conditions.
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
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