2,3-Diphenylcyclopropenone (1) reacts with N-imidoylthioureas 2a-e to form the pyrimidin-4(3H)-ones 5a-e. The reaction mechanism can be described as due to stepwise addition accompanied by elimination of phenyl isothiocyanate.
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Aly, A. A., NourEl-Din, A. M., Gomaa, M. A. M., Brown, A. B., & Fahmi, M. S. (2007). Unusual reactivity of 2,3-diphenylcyclopropenone towards N-imidoylthioureas; facile synthesis of 3-aryl-2,5,6-triphenylpyrimidin-4(3H)- one (PART III). Journal of Chemical Research, (8), 439–441. https://doi.org/10.3184/030823407X234563