Benzimidazol-2-yl di- or tri-thiocarbonates and iso- or isothio-cyanates give, on heating in the presence of triethylamine, the novel [1,3,5]thiadiazino[3,2-a]benzimidazole-2,4(3H)-diones (11; X = Y = O) or their sulphur analogues (11; X = S, Y = O; or X = Y = S).
P. D. Howes and M. Pianka, J. Chem. Soc., Perkin Trans. 1, 1980, 762 DOI: 10.1039/P19800000762
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