Silver-Catalyzed Trifluoromethylalkynylation of Unactivated Alkenes with Hypervalent Iodine Reagents
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.9b03230
日期:2019.11.1
unactivated alkenes is presented. The reaction is catalyzed by silver(I) trifluoroacetate for the simultaneous construction of two C-C bonds (alkyl-alkyne and alkyl-CF3). By employing versatile hypervalentiodinereagents, ethynylbenziodoxolones, useful trifluoromethylalkynylated compounds can be prepared from simple alkenes displaying excellent functional group tolerability. A radical mechanism is proposed
Zinc-Mediated Intermolecular Reductive Radical Fluoroalkylsulfination of Unsaturated Carbon-Carbon Bonds with Fluoroalkyl Bromides and Sulfur Dioxide
作者:Yongan Liu、Qiongzhen Lin、Zhiwei Xiao、Changge Zheng、Yong Guo、Qing-Yun Chen、Chao Liu
DOI:10.1002/chem.201805526
日期:2019.2.1
general zinc‐mediated intermolecular reductiveradical fluoroalkylsulfination of unsaturated C−C bonds has been developed using readily available fluoroalkyl bromides and 1,4‐diazabicyclo[2.2.2]octane‐bis(sulfur dioxide) adduct (DABSO) with wide substrate scope and excellent functional group tolerance. Sulfur dioxide anionradical generated in situ from the reduction of sulfur dioxide with zinc may be
Radical Pentafluoroethylation of Unactivated Alkenes Using CuCF<sub>2</sub>CF<sub>3</sub>
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.0c01646
日期:2020.6.5
source for the CF2CF3 radical under aerobic conditions at room temperature. Using this system, readily available unactivatedalkenes can be pentafluoroethylated to provide novel allylic CF2CF3 compounds with excellent E-selectivity and functional group tolerability. Mechanistic studies including TEMPO–CF2CF3 trapping and radical clock experiments provided strong evidence for radical pathways, offering
Copper-Catalyzed Trifluoromethylation of Unactivated Olefins
作者:Andrew T. Parsons、Stephen L. Buchwald
DOI:10.1002/anie.201104053
日期:2011.9.19
Activating the inactive: A copper‐catalyzed allylic trifluoromethylation of unactivated terminal olefins proceeds under mild conditions to produce linear allylic trifluoromethylated products with high E/Z selectivity (see scheme). The reaction can be applied to a range of substrates bearing numerous functional groups. Furthermore, the reaction is scalable and amenable to a benchtop setup.
Oxidative radical phosphonotrifluoromethylthiolation of unactivated alkenes with alkyl phosphonate, silver(I) trifluoromethanethiolate and potassium persulfate
We report herein a mild and efficient oxidative radical intermolecular phosphonotrifluoromethylthiolation of unactivated alkenes with good functional group tolerance. The reaction operates via a radical pathway involving oxidative generation of phosphonyl radicals and umpolungradicalcoupling of silver trifluoromethanethiolate.