Copper-catalysed photoinduced decarboxylative alkynylation: a combined experimental and computational study
作者:Yu Mao、Wenxuan Zhao、Shuo Lu、Lei Yu、Yi Wang、Yong Liang、Shengyang Ni、Yi Pan
DOI:10.1039/d0sc02213f
日期:——
Redox-active esters (RAEs) as alkyl radical precursors have demonstrated great advantages for C–C bond formation. A decarboxylative cross-coupling method is described to afford substituted alkynes from various carboxylic acids using copper catalysts CuCl and Cu(acac)2. The photoexcitation of copper acetylides with electron-rich NEt3 as a ligand provides a general strategy to generate a range of alkyl
The alkoxylradical is an important reactive intermediate in mechanistic studies and organic synthesis; however, its current generation fromalcohol oxidation heavily relies on transition metal activation under strong oxidative conditions. Here we report the first visible-light-induced alcohol oxidation to generate alkoxylradicals by cyclic iodine(III) reagent catalysis under mild reaction conditions
Aluminum-Catalyzed Cross-Coupling of Silylalkynes with Aliphatic C–F Bonds
作者:Amit K. Jaiswal、Kelvin K. K. Goh、Simon Sung、Rowan D. Young
DOI:10.1021/acs.orglett.7b00712
日期:2017.4.7
report the generation of aliphatic and benzylic acetylenes via reaction of primary, secondary, and tertiary aliphatic fluorides with various trimethylsilyl acetylides. These reactions are catalyzed by Al and B Lewis acids, most effectively by the extremely fluorophilic tris(pentafluorophenyl)alane, representing the first example of catalytic incorporation of alkynes into aliphatic C–F positions. The fluorophilicity
Investigating Direct Alkynylation at the Bridgehead of Bicyclic Cages Using Silver(I) Acetylides
作者:Rebecca H. Pouwer、Jason B. Harper、Kamesh Vyakaranam、Josef Michl、Craig M. Williams、Carsten H. Jessen、Paul V. Bernhardt
DOI:10.1002/ejoc.200600701
日期:2007.1
Silver(I) acetylides facilitate direct carbon-carbon bond formation at the bridgehead position of adamantane, and in some instances related systems such as carborate anions and bicyclo [2.2.2]octanes. Substrate constraints along with attempts to further understand the underlying mechanism are presented. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007).