Heating an allylamine (e.g. 9) and a nitrone (e.g. 10) in an inert solvent produces often excellent yields of a 1,2,5-oxadiazinane (e.g. 11) by a pathway which features a retro-Cope elimination and a Meisenheimer rearrangement; reduction of the oxadiazinanes leads to vicinal diamines and hence overall amination of the alkene function in the original allylamine.