Silver Triflate-Catalyzed Cyclopropenation of Internal Alkynes with Donor-/Acceptor-Substituted Diazo Compounds
摘要:
Silver triflate was found to be an efficient catalyst for the cyclopropenation of internal alkynes using donor-/acceptor-substituted diazo compounds as carbenoid precursors. Highly substituted cyclopropenes, which cannot be synthesized directly via rhodium(II)-catalyzed carbenoid chemistry, can now be readily accessed.
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。
Recyclable heterogeneous metal foil-catalyzed cyclopropenation of alkynes and diazoacetates under solvent-free mechanochemical reaction conditions
作者:Longrui Chen、Devonna Leslie、Michael G. Coleman、James Mack
DOI:10.1039/c8sc00443a
日期:——
cyclopropenation of terminal and internal alkynes under mechanochemical reactionconditions. This methodology enables the functionalization of a wide range of terminal or internal alkynes under ambient, aerobic, and solvent-freeconditions. Finally, we have demonstrated a unique and versatile one-pot domino Sonogashira-cyclopropenation mechanochemical reaction for the formation of complex cyclopropenes.