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。
Synthesis of 2,4-diamino-5-acetyl(ethoxycarbonyl)pyrimidines from ?-dicarbonyl compounds and dicyandiamide and their use for building a pyrimido[4,5-d]pyrimidine system
摘要:
2,4-Diamino-5-acetyl(ethoxycarbonyl)-6-methyl(phenyl)pyrimidines were obtained by the reaction of acetylacetone and beta-ketocarboxylic acid esters with dicyandiamide in the presence of Ni(OAc)2. It was shown that annelation of the pyrimidine ring with this compound provides a convenient method for building the pyrimido[4,5-d]-pyrimidine system. New derivatives of 2-aminopyrimido[4,5-d]pyrimidine, 7-amino-3H-pyrimido[4,5-d]-pyrimidin-4-one, and 7-amino-1H,3H-pyrimido[4,5-d]-pyrimidine-2,4-dione were synthesized.