作者:V. A. Dorokhov、V. A. Voronkova、A. V. Komkov、S. V. Baranin、L. S. Vasil’ev
DOI:10.1007/s11172-010-0201-5
日期:2010.5
A reaction of alkyl 2-(diaminomethylidene)-3-oxoalkanoates with arylisocyanates leads to the formation of the corresponding ureas, which upon the action of Na alkoxides cyclize to 1-aryl-6-R-cytosine-5-carboxylates. The latter reacting with arylisocyanates according to the similar scheme give rise to 3,6-diaryl-5-methylpyrimido[4,5-d]pyrimidine-2,4,7(1H,3H,6H)-triones.
烷基 2-(二氨基亚甲基)-3-氧代烷酸与芳基异氰酸酯反应,生成相应的脲,在 Na 烷氧基的作用下,环化为 1-芳基-6-R-胞嘧啶-5-羧酸酯。后者与芳基异氰酸酯反应,根据类似的方案,生成 3,6-二芳基-5-甲基嘧啶并[4,5-d]嘧啶-2,4,7(1H,3H,6H)-三酮。