CONDENSATION REACTION OF ETHYL 4-OXO-4H-BENZO[d][1,3]OXAZINE-2-CARBOXYLATES WITH POTASSIUM CYANATE: 2,4(1H,3H)-QUINAZOLINEDIONES SYNTHESIS

[摘要]：The condensation reaction of ethyl 4-oxo-4H-benzo[d][1,3]oxazine-2-carboxylates with acidic solution of potassium cyanate offers a novel and expedient route to the synthesis of 2,4(1H,3H)-quinazolinediones under mild reaction conditions.

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