Methods were developed for the synthesis of new pyrido[2,3-d]pyrimidine and pyrimidino[4,5-d][1,3]oxazine derivatives. When heated under reflux with MeONa in BuOH, 5-acetyl-4-aminopyrimidines, acylated with carboxylic anhydrides or acid chlorides, are transformed into pyrido[2,3-d]pyrimidin-5-one derivatives, i.e., the acetyl methyl group and the amide carbonyl moiety are involved in the cyclization. In the presence of an activated CH₂ group (e.g., PhCH₂) in the amide moiety, the cyclization involves this group and the acetyl carbonyl giving rise to pyrido[2,3-d]pyrimidin-7-one derivatives. The reaction of 5-acetyl-4-aminopyrimidines with carboxylic acid chlorides under reflux in xylene followed by addition of a base affords pyrimidino[4,5-d][1,3]oxazines.

开发了合成新的吡啶并[2,3- d ]嘧啶和嘧啶并[4,5- d ][1,3]恶嗪衍生物的方法。当与 MeONa 在 BuOH 中回流加热时，​​用羧酸酐或酰氯酰化的 5-乙酰基-4-氨基嘧啶转化为吡啶并[2,3 - d ]嘧啶-5-酮衍生物，即乙酰甲基和酰胺羰基部分参与环化。在活化的CH的存在₂基团（例如。，物理信道₂）在酰胺部分中，环化包括该组和乙酰羰基引起吡啶并[2,3- d]嘧啶-7-one衍生物。5-乙酰基-4-氨基嘧啶与羧酸氯化物在二甲苯中回流反应，然后加入碱，得到嘧啶并[4,5- d ][1,3]恶嗪。