The catalyst-free electrochemical di- and trifluoromethylation/cyclization of N-substituted acrylamides was realized under external oxidant-free conditions. The strategy provides expedient access to fluoroalkylated oxindoles and 3,4-dihydroquinolin-2(1H)-ones with ample scope and broad functional group tolerance by mild, direct electrolysis of sodium sulfinates in an undivided cell. Detailed mechanistic
Metal-Free Trifluoromethylation and Arylation of Alkenes: Domino Synthesis of Oxindole Derivatives
作者:Liangliang Shi、Xiaobo Yang、Yuyuan Wang、Haijun Yang、Hua Fu
DOI:10.1002/adsc.201300995
日期:2014.3.24
N‐alkyl‐N‐phenylacrylamides as the starting materials, inexpensive and easily stored Langlois reagent (sodiumtrifluoromethanesulfinate) as the trifluoromethyl source, and iodobenzene diacetate [PhI(OAc)2] as the oxidant. The procedure involves a metal‐free domino trifluoromethylation and arylation of alkenes. The methods did not need mediation of any transition metal which avoided contaminations of toxic
Photoredox Trifluoromethylation/Cyclization of N-Arylacrylamides with 4-(Difluoroamino)-1-[(trifluoromethyl)sulfonyl]pyridinium Triflate (TFSP)
作者:Xiaoqing Li、Xiangsheng Xu、Zetian Sun、Hui Yang、Huimin Chen、Fenghua Mao
DOI:10.1055/a-1967-1350
日期:2023.3
Abstract
A photoredox trifluoromethylation/cyclization of N-arylacrylamides with inexpensive stable solid 4-(difluoroamino)-1-[(trifluoromethyl)sulfonyl]pyridinium triflate (TFSP) has been developed.
Silver-Mediated Radical Trifluoromethylarylation of Activated Alkenes for the Synthesis of Oxindoles Bearing a CF3 Group
作者:Fu-Xue Chen、Yao-Feng Wang、Jiashen Qiu、Dejie Kong
DOI:10.1055/s-0033-1341272
日期:——
A radical trifluoromethylarylation of N-arylacrylamides with in situ generated [AgCF3] species from Me3SiCF3 and AgF in DMF is established through a tandem radical addition and C-H activation pathway. It provided a concise method to prepare 21 examples of CF3-containing oxindoles within four hours.