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Copper-Catalyzed Cascade Bicyclization of o-Alkenylphenyl Isothiocyanates with Sodium Azide Leading to the 5H-Benzo[d]tetrazolo[5,1-b] [1,3]thiazines

A simple and efficient method for the preparation of 5 H -benzo[ d ]tetrazolo[5,1- b ][1,3]thiazines has been developed. The transformation involved the copper(I)-catalyzed cascade bicyclization of o -alkenylphenyl isothiocyanates with sodium azide to afford corresponding products in moderate to good yields. This present strategy provides an effective way to construct small molecular N- , and S -heterocycles.