The synthesis of substituted dihydrooxazoles by the CuI-catalyzed cycloisomerization of terminal propargyl amides is reported.
We report novel sterically-hindered ligands with strong σ-donation from the C3-indazole carbene center and flexible N-substitution with a 2,6-bis(diphenylmethyl)aryl group that extends beyond the metal center in non-classical N-heterocyclic carbenes.