-CYCLOADDITIONS OF THIONES WITH NITROSOALKENES: SYNTHESIS OF DERIVATIVES OF 4H-1,5,2-OXATHIAZINE, A NEW HETEROCYCLIC SYSTEM.

Article abstract of DOI:10.1016/S0040-4039(00)94799-3

Conjugated nitrosoalkenes, generated in situ via dehydrobromination of α-bromoketoximes, undergo an easy <4+2>-cycloaddition with thiocarbonyl compounds to give very high yields of the new heterocycles 4H-1,5,2-oxathiazines.The thermolysis and the behaviour to oxidation of these adducts were tested.