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A novel, environmentally friendly synthesis of 5,9-dihydropyrimido[5,4- e ][1,2,4]triazolo[1,5- a ]pyrimidine-6,8(4 H ,7 H )-diones has been developed by using a one-pot condensation of 1,3-dimethylbarbituric acid, 3-amino-1 H -1,2,4-triazoles, and aromatic aldehydes. The reactions were established based on green chemistry principles under catalyst- and solvent-free conditions.
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Karami et al. (2015) studied this question.
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