structure of the crystalline product is based on microanalytical data and spectroscopicproperties, together with degradation studies. Similar aliphatic ketonitrone hydrochlorides have been obtained from reaction of 2-phenylpropene with other α-chloronitroso compounds 1b-1e (73–91%), and from α-chloroni-trosoadamantane . and a series of allylic olefins (76–95%). Rearrangement of an intermediary N-α-ch
A [3 + 3] formal cycloaddition reactionbetween in situ formed azaoxyallyl cations and nitrones from isatins has been developed, furnishing a spectrum of spiro[1,2,4‐oxadiazinan‐5‐one]oxindoles in good to excellent yields with excellent diastereoselectivity. This method provides direct and efficient access to potentially bioactive spirooxindoles incorporating a six‐membered heterocyclic scaffold.