Cp*Co(iii)-catalyzed thiocarbamate-directed C–H aminocarbonylation, amination, and cascade annulation of pyrroles

Abstract

Cobalt(III)-catalyzed thiocarbamate directed aminocarbonylation and amination of C–H bonds are described to access diverse amides. Biologically relevant pyrrolo[1,2-c]imidazoles were readily accessed via one-pot intramolecular cyclization at the thiocarbamoyl directing group. Notably, C–N amidation proceeded smoothly with an elusive catalyst TON of 250 for this Cp*Co(III)-catalysis. Broad scope, scalability, and easy removal of DG are other key features of these methods. The mechanisms of these C–H amidation reactions were proposed through control experiments and DFT calculations.