Borane catalysed cyclopropenation of arylacetylenes

Abstract
Triarylboranes have gained substantial attention as catalysts for C–C bond forming reactions due to their remarkable catalytic activities. Herein, we report B(C6F5)3 catalysed cyclopropenation of a wide variety of arylacetylenes using donor–acceptor diazoesters. A mild reaction protocol has been developed for the synthesis of functionalised cyclopropenes (33 examples) in good to excellent yields.
Funding Information
  • Engineering and Physical Sciences Research Council (EP/R026912/1)