Bis(N-heterocyclic carbene)-Borylene-Mediated Heteroallene Activation

Abstract

This study describes a bis(N-heterocyclic carbene)-borylene that activates heteroallenes. The borylene undergoes Staudinger reaction with azide to afford an NHC-iminoborane, and it also catalyzes the cyclotrimerization of isocyanates to give isocyanurates. In the presence of excess pinacolborane, it catalyzes the chemoselective hydroboration of isocyanates to form N-boryl formamides.