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.
Synthesis of 1,3-diaryl-3-trifluoromethylcyclopropenes by transition-metal-free reaction of 2,2,2-trifluoroacetophenone tosylhydrazones with alkynes: the effect of the trifluoromethyl group
作者:Raquel Barroso、Azucena Jiménez、M. Carmen Pérez-Aguilar、María-Paz Cabal、Carlos Valdés
DOI:10.1039/c5cc10472f
日期:——
Free carbenes, generated from trifluoroacetophenone tosylhydrazones, lead to 1,3-diaryl-3-trifluoromethylcyclopropenes by transition metal-free reactions with alkynes.