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。
A highly regioselective tandem 1,3-dipolar cycloaddition of cyclopropene 1,1-diesters and nitrile oxides: synthesis of highly functionalized isoxazoles
作者:Shaojin Chen、Jun Ren、Zhongwen Wang
DOI:10.1016/j.tet.2009.09.034
日期:2009.11
A highly regioselective tandem 1,3-dipolar cycloaddition of cyclopropene 1,1-diesters with nitrile oxides was described. This reaction supplied a new method for synthesis of polyfunctionalized isoxazole derivatives in moderate to excellent yields under mild conditions.
Dual Gold/Silver Catalysis Involving Alkynylgold(III) Intermediates Formed by Oxidative Addition and Silver‐Catalyzed C−H Activation for the Direct Alkynylation of Cyclopropenes
作者:Yangyang Yang、Patrick Antoni、Marc Zimmer、Kohei Sekine、Florian F. Mulks、Long Hu、Lumin Zhang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201812577
日期:2019.4
While gold‐mediated synergistic catalytic processes involving transmetalations with other metals are well understood, AuI/AuIII cycles in these reactions are rarely reported. Herein a gold‐catalyzed direct alkynylation of cyclopropenes is enabled by two operating catalytic cycles, an oxidative catalytic cycle involving an alkynyl AuIII complex formed by oxidative addition and one involving a silver‐mediated
尽管众所周知金介导的与其他金属发生重金属化的协同催化过程,但很少报道这些反应中的Au I / Au III循环。在此,金的环丙烯丙烯直接烷基化反应通过两个操作催化循环实现,一个氧化催化循环涉及通过氧化加成形成的炔基Au III配合物,另一个涉及银介导的CH活化。
Ring-Opening Reactions of Cyclopropenedicarboxylates with Organolithiums and Organozincs
作者:Yu Liu、Qiong Yu、Shengming Ma
DOI:10.1002/ejoc.201201588
日期:2013.5
Ring-openingreactions of cyclopropenedicarboxylates with organolithiums and organozincs have been studied. Organolithiums and dialkyl- or diphenylzincs afforded a series of 1-alkenyl malonates with attack occurring by the organic group from the organometallic reagent at the less substituted sp2-hybridized carbon of the cyclopropene moiety. Mechanistic studies proved both anion and dianion intermediates