A new method for the synthesis of vinyl trifluoromethyl compounds from α, β‐unsaturated carboxylic acids and CF3SO2Na has been developed. This electrochemical decarboxylative trifluoro‐methylation was found to be highly stereoselective and afforded products in good yields with wide substrate scope under metal‐free and external chemical oxidant‐free conditions.
已开发出一种由α,β-不饱和羧酸和CF 3 SO 2 Na合成乙烯基三氟甲基化合物的新方法。发现这种电化学脱羧三氟甲基化反应具有高度的立体选择性,并且在无金属和无外部化学氧化剂的条件下,可以提供高收率的产品,具有广泛的底物范围。
Metal-free radical trifluoromethylation of β-nitroalkenes through visible-light photoredox catalysis
作者:Siba P. Midya、Jagannath Rana、Thomas Abraham、Bhaskaran Aswin、Ekambaram Balaraman
DOI:10.1039/c7cc02589k
日期:——
efficient catalytic conversion of nitroalkenes to highly stereoselective 1-trifluoromethylalkenes at room temperature. This unprecedented metal-free photocatalytic strategy is simple and operates under visible-light irradiation using the commercially available CF3 source.
Decarboxylative and Denitrative Trifluoromethylation for the Synthesis of C<sub>vinyl</sub>CF<sub>3</sub>Compounds with Togni (II) Reagent
作者:Jing-jing Ma、Wen-bin Yi、Guo-ping Lu、Chun Cai
DOI:10.1002/adsc.201500631
日期:2015.11.16
A highly efficient dimethylformamide (DMF)-promoted decarboxylativetrifluoromethylation of α,β-unsaturated carboxylic acids with Togni (II) reagent under metal-free conditions has been developed. The reactions showed good yields, high stereoselectivities and excellent functional group tolerance. Mechanistic studies confirmed that free-radical processes were involved in this system since the CF3 radical
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