2714 J. Org. Chem., Vol. 56, No. 8, 1991 Padwa et al. similar reaction conditions. In all cases, the cycloaddition afforded a single product corresponding to a rearranged cycloadduct. N-(1-Deuteriobenzylidene) benzylamine, when treated with diene 1, produced cycloadduct 5 where the deuterium was adjacent to the nitrogen atom. The cycloaddition did not occur with imines derived from aryl ketones.