4-Cyclohexylimino-2-methyl-3-t-butyl-1,2-oxazetidine (Ib) prepared by BF3-catalysed [3 + 1] cycloaddition of N-2,2-dimethylpropylidenemethylamine N-oxide (C-t-butyl-N-methyl nitrone) with cyclohexyl isocyanide is shown to give reactions of the hypothetical Schiff base from formaldehyde and the α-aminocarboxamide (V) when handled in acidic media.
D. Moderhack and M. Lorke, J. Chem. Soc., Chem. Commun., 1977, 831 DOI: 10.1039/C39770000831
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