Copper- and Iron-Catalyzed Decarboxylative Tri- and Difluoromethylation of α,β-Unsaturated Carboxylic Acids with CF<sub>3</sub>SO<sub>2</sub>Na and (CF<sub>2</sub>HSO<sub>2</sub>)<sub>2</sub>Zn via a Radical Process
作者:Zejiang Li、Zili Cui、Zhong-Quan Liu
DOI:10.1021/ol3034059
日期:2013.1.18
A copper-catalyzed decarboxylative trifluoromethylation of various α,β-unsaturated carboxylic acids by using a stable and inexpensive solid, sodiumtrifluoromethanesulfinate (CF3SO2Na, Langlois reagent), was developed. In addition, an iron-catalyzed difluoromethylation of aryl-substituted acrylic acids by using zinc difluoromethanesulfinate (DFMS, (CF2HSO2)2Zn, Baran reagent) via a similar radical
通过使用稳定且廉价的固体三氟甲烷亚磺酸钠(CF 3 SO 2 Na,Langlois试剂),开发了铜催化的各种α,β-不饱和羧酸的脱羧三氟甲基化反应。另外,还通过类似的自由基方法,通过使用二氟甲亚磺酸锌(DFMS,(CF 2 HSO 2)2 Zn,Baran试剂),实现了铁催化的芳基取代的丙烯酸的二氟甲基化。
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
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
Copper/Silver-Mediated Decarboxylative Trifluoromethylation of α,β-Unsaturated Carboxylic Acids with CF3SO2Na
作者:Yaming Li、Chunying Duan、Jun Yin、Rong Zhang、Kun Jin
DOI:10.1055/s-0033-1338578
日期:——
copper/silver-catalyzed decarboxylativetrifluoromethylation of α,β-unsaturatedcarboxylicacids with CF3SO2Na was performed under relatively mild conditions. The reaction shows high E/Z selectivity and wide substrate tolerance. Ag2CO3 plays an important role in promoting the decarboxylation process. A copper/silver-catalyzed decarboxylativetrifluoromethylation of α,β-unsaturatedcarboxylicacids with CF3SO2Na
摘要 在相对温和的条件下,用CF 3 SO 2 Na进行铜/银催化的α,β-不饱和羧酸的脱羧三氟甲基化反应。该反应显示出高的E / Z选择性和宽的底物耐受性。Ag 2 CO 3在促进脱羧过程中起重要作用。 在相对温和的条件下,用CF 3 SO 2 Na进行铜/银催化的α,β-不饱和羧酸的脱羧三氟甲基化反应。该反应显示出高的E / Z选择性和宽的底物耐受性。Ag 2 CO 3在促进脱羧过程中起重要作用。
Facile synthesis of (E)-β-(trifluoromethyl)styrenes from halothane (HCFC-123B1)
A practical and convenient synthesis of (E)-beta-(trifluoromethyl)styrenes has been achieved by the reaction of commercially available halothane (HCFC-123B1) and hydrazones prepared in advance in situ, in the presence of 1,2-ethylenediamine and a catalytic amount of CuCl2.2H(2)O at room temperature. The products showed acceptable to high yields and high to excellent stereoselectivity. This handy synthetic method provided easy access to a variety of (E)-beta-(trifluoromethyl)styrenes. (C) 2014 Elsevier B.V. All rights reserved.