Acyl isothiocyanates 4a–e react with two equivalents of diphenyldiazomethane at room temperature to give the 4,5-dihydro-1,3-oxazole-4-spiro-2′-thiiranes 5a–e which isomerize thermally to the thietan-3-imines 6a–e.
G. L'abbé, A. Francis, W. Dehaen and S. Toppet, J. Chem. Soc., Chem. Commun., 1995, 67 DOI: 10.1039/C39950000067
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