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A fast (15 min) and efficient cascade reaction of salicylaldehydes and 1,3-dimethylbarbituric acid in the presence of  p -TsOH as a catalyst furnishes substituted 5-(1,3-dimethyl-2,4-dioxo-1,3,4,5-tetrahydro-2 H -chromeno[2,3- d ]pyrimidin-5-yl)-1,3-dimethylpyrimidine-2,4,6(1 H ,3 H ,5 H )-triones  1a–h , containing both chromeno[2,3- d ]pyrimidine and hexahydropyrimidine-2,4,6-trione pharmacologically active fragments, in 95–99% yields. This new procedure is characterized by the use of inexpensive reagents and a simple workup.

heterocyclic communications

A fast and efficient ‘on-solvent’ cascade assembling of salicylaldehydes and dimethylbarbituric acid into 5-(1,3-dimethyl-2,4-dioxo-1,3,4,5-tetrahydro-2 H -chromeno[2,3- d ]pyrimidin-5-yl)-1,3-dimethylpyrimidine-2,4,6(1 H ,3 H ,5 H )-triones