Microwave-Assisted Cp*CoIII-Catalyzed C-H Activation/Double C-N Bond Formation Reactions to Thiadiazine 1-Oxides.

A microwave-assisted, Cp*CoIII-catalyzed direct C-H activation/double C-N bond formation reaction of simple NH-sulfoximines with 1,4,2-dioxazol-5-ones to produce diverse thiadiazine-1-oxides is reported. The reaction tolerates a broad range of functional groups under external oxidant-free conditions and only releases CO2 and H2O as the sole byproducts. The preliminary mechanistic studies revealed an electrophilic metalation pathway is likely involved in the reaction.