Carbene transfer reactions play an important role in the field of organicsynthesis because of their ability to construct a variety of molecules. Herein, we reported on blue light-induced cyclopropenizations of N-tosylhydrazones in water, which avoids the use of expensive metal-based catalysts and toxic organic solvents. This metal-free and operationally simple methodology enable highly efficient cyclopropenizations
Bis(imino)pyridine iron complexes for catalytic carbene transfer reactions
作者:Ban Wang、Isaac G. Howard、Jackson W. Pope、Eric D. Conte、Yongming Deng
DOI:10.1039/c9sc02189b
日期:——
bis(imino)pyridine iron complex, for the first time, is developed as an effective metal carbene catalyst for carbene transfer reactions of donor-acceptor diazo compounds. Its broad catalytic capability is demonstrated by a range of metal carbene reactions, from cyclopropanation, cyclopropenation, epoxidation, and Doyle-Kirmse reaction to O-H insertion, N-H insertion, and C-H insertionreactions. The
Synthesis of Quinolines via the Metal-free Visible-Light-Mediated Radical Azidation of Cyclopropenes
作者:Vladyslav Smyrnov、Bastian Muriel、Jerome Waser
DOI:10.1021/acs.orglett.1c01775
日期:2021.7.16
hypervalent iodine reagent as an azide radical source under visible-light irradiation. Multisubstituted quinoline products were obtained in 34–81% yield. The reaction was most efficient for 3-trifluoromethylcyclopropenes, affording valuable 4-trifluoromethylquinolines. The transformation probably proceeds through the cyclization of an iminyl radical formed by the addition of the azide radical on the
We report an unprecedented C-H bond functionalization of cyclopropenes enabled by dinuclear gold catalysis. Highly selective C-H allylation, alkynylation and halogenation of cyclopropenes with organic halides have been realized. The reaction does not require strong external oxidants and affords access to functionalized cyclopropenes in moderate to good yields. The reductive elimination process to controllably
我们报告了由双核金催化实现的环丙烯的前所未有的 CH 键功能化。已经实现了环丙烯与有机卤化物的高选择性 CH 烯丙基化、炔基化和卤化。该反应不需要强外部氧化剂,并且可以以中等至良好的产率获得官能化的环丙烯。可以通过使用不同的双核金催化剂来调整可控地构建 CC 或 CX 键的还原消除过程。