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Synthesis of 1,2-Benzothiazines by a Rhodium-Catalyzed Domino C-H Activation/Cyclization/Elimination Process from S-Aryl Sulfoximines and Pyridotriazoles.

A method for the synthesis of a large number of 1,2-benzothiazines bearing pyridyl as well as carbonyl groups is developed from rhodium-catalyzed carbene insertions into aromatic C-H bonds of S-aryl sulfoximines using pyridotriazoles by denitrogenative cyclization followed by the elimination of alcohols. The present method involves the N-H/C-H activation of simple alkyl aryl sulfoximines and has the advantages of a broad substrate scope, high functional group tolerance, and good regioselectivity.