1,2,3-Benzotriazine Synthesis by Heterocyclization of p -Tosylmethyl Isocyanide Derivatives.

An efficient methodology to form 4-alkoxy- and 4-aryloxybenzo[ d ][1,2,3]triazines via an intramolecular heterocyclization of 1-azido-2-[isocyano( p -tosyl)methyl]benzenes under basic conditions has been developed. DFT calculations have been performed to further understand the mechanism of this heterocyclization, which occurs in good to excellent yields with a broad scope.