Thermal 1 : 1 cycloaddition of 1-azirines to sym-tetrazines provides a synthesis of the as yet unknown class of 1,2,4-triazepines and also leads via these intermediates to pyrimidines, pyrazoles, and 2 : 1 adducts.
D. J. Anderson and A. Hassner, J. Chem. Soc., Chem. Commun., 1974, 45b DOI: 10.1039/C3974000045B
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