Melamine trisulfonic acid was used as an efficient and recyclable catalyst for the one-pot synthesis of 10-aryl-6,8-dimethyl-6,10-dihydro-5-oxa-6,8-diazaanthra[2,3-d][1,3]dioxole-7,9-diones by condensation of 3,4-methylene dioxyphenol, aromatic aldehydes and 1,3-dimethylbarbituric acid under solvent-free conditions. Different types of aromatic. aldehydes were used in the reaction and in all cases the products were obtained in good to excellent yields.
三
磺酸三聚氰胺被用作高效可循环催化剂,用于在无溶剂条件下通过3,4-亚甲二氧
苯酚、芳香醛和
1,3-二甲基巴比妥酸的缩合反应合成10-芳基-6,8-二甲基-6,10-二氢-5-氧-6,8-二氮杂
蒽[2,3-d][1,3]
二噁烷-7,9-二酮。反应中使用了不同类型的芳香醛,在所有情况下产物的收率都在良好至优秀之间。