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。
Stereoselective Formation of Alkenyl Halides via Magnesium Halide Promoted Ring Opening of Bis-Activated Cyclopropenes
作者:Yi Wang、Hon Wai Lam
DOI:10.1021/jo802475x
日期:2009.2.6
In the presence of stoichiometric magnesium halides, a range of bis-activated cyclopropenes undergo highly stereoselective ring-opening reactions to produce multisubstituted alkenyl halides. More highly functionalized compounds may be obtained by trapping of the magnesium enolate intermediates in situ.