NiH‐Catalyzed Migratory Defluorinative Olefin Cross‐Coupling: Trifluoromethyl‐Substituted Alkenes as Acceptor Olefins to Form
<i>gem</i>
‐Difluoroalkenes
a NiH-catalyzed migratory defluorinative coupling between two electronically differentiated olefins. A broad range of unactivated donor olefins can be joined directly to acceptor olefins containing an electron-deficient trifluoromethyl substituent in both intra- and intermolecular fashion to form gem-difluoroalkenes. This migratory coupling shows both site- and chemoselectivity under mild conditions
Palladium-catalyzed Suzuki–Miyaura reaction of fluorinated vinyl chloride: a new approach for synthesis α and α,β-trifluoromethylstyrenes
作者:Yang Li、Bo Zhao、Kun Dai、Dong-Huai Tu、Bo Wang、Yao-Yu Wang、Zhao-Tie Liu、Zhong-Wen Liu、Jian Lu
DOI:10.1016/j.tet.2016.07.085
日期:2016.9
A mild and efficient palladium-catalyzed cross-coupling between fluorinated vinyl chloride and arylboronic acids is described. The use of ligand B successfully overcomes the strong electronic withdrawing of trifluoromethylated substrates and allows the efficient synthesis of a wide range of α and α,β-trifluoromethyl containing olefins. By using this method, the keyintermediate for synthesis of Efavirenz
Visible-Light-Mediated C–I Difluoroallylation with an α-Aminoalkyl Radical as a Mediator
作者:Fuyang Yue、Jianyang Dong、Yuxiu Liu、Qingmin Wang
DOI:10.1021/acs.orglett.1c02905
日期:2021.9.17
for direct visible-light-mediated C–I difluoroallylation reactions of α-trifluoromethyl arylalkenes with alkyliodides at room temperature with an α-aminoalkyl radical as a mediator. The protocol permits efficient functionalization of various α-trifluoromethyl arylalkenes with cyclic and acyclic primary, secondary, and tertiary alkyliodides and is scalable to the gram level. This mild protocol uses
Photoredox relay-catalyzed <i>gem</i>-difluoroallylation of alkyl iodides
作者:Yuanqiang Guo、Yunpeng Cao、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1cc04284j
日期:——
photocatalyst catalyze the reaction at different stages in the desired sequence under the same reaction conditions, and do not inhibit each other. This convenient method transforms a broad scope of alkyliodides into the corresponding gem-difluoroalkenes via C(sp3)–C(sp3) bond construction. The protocol has good functional group tolerance and is suitable for the late-stage modification of multifunctional
Ir-catalyzed enantioselective addition of an N-methyl C–H bond of 2-(methylamino)pyridine derivatives to α-trifluoromethylstyrenes proceeded via C–Hactivation to give chiral γ-branched amine derivatives having a trifluoromethyl-substituted stereocenter. It was found that a bulky and electron-withdrawing group at the 3-position of 2-(methylamino)pyridines was necessary for the present C–H addition reaction