Heterocyclic formamidines react with phenyl isocyanate at room temperature to give a [2 + 2] cycloadduct which decomposes at elevated temperatures in two different ways; phenyl isocyanate reacts with the heterocyclic isocyanate formed in situ to form a new cycloadduct, a fused 1,3,5-triazine-2,4-dione derivative.
M. Tišbler and B. Stanovnik, J. Chem. Soc., Chem. Commun., 1980, 313 DOI: 10.1039/C39800000313
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