1,1'-Carbonyldiimidazole → 5,7-Dihydro-2H-imidazo[4',5':4,5]benzo[1,2-d]oxazole-2,6(3H)-dione

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Reaction Steps

3.3 g. (0.02 mole) 5,6-diaminobenzoxazolin-2-one and 5.5 g. (0.034 mole) 1,1'-carbonyldiimidazole are dissolved in 150 ml. dioxan and heated to the boil for 3 hours. After cooling to ambient temperature, the brownish crystalline substance obtained is filtered off with suction, boiled with dimethylformamide, filtered with suction and washed with methanol. There is obtained a yield of 65% of theory of the desired compound; m.p. >360° C.

Provenance & Evidence