A new method for the generation of α-nitrosoolefins from ketooximes and its application to the synthesis of 5,6-dihydro-4H-1,2-oxazine derivatives [1]

Reaction of ketooximes containing α-methylene group with chloramine-T followed by treatment with triethylamine leads to the formation of α-nitrosoolefins via α-nitrosochloride, which can react in situ intermolecularly with olefinic compounds to produce 5,6-dihydro-4H-1,2-oxazine derivatives in good yield.