Three-component reactions of 6-aminouracils and 6-aminothiouracils with formaldehyde and primary amines gave 6-alkyl-5,6,7,8-tetrahydropyrimido[4,5-d]pyrimidine-2,4-diones and 6-alkyl-2-thioxo-5,6,7,8-tetrahydropyrimido[4,5-d]pyrimidin-4-ones.
6-aminouracils 和 6-aminothiouracils 与
甲醛和
伯胺发生三组分反应,生成 6-烷基-5,6,7,8-四氢
嘧啶并[4,5-d]
嘧啶-2,4-二酮和 6-烷基-2-
硫酮-5,6,7,8-四氢
嘧啶并[4,5-d]
嘧啶-4-酮。