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。
Efficient methods for the synthesis of pyrido[2,3-d]pyrimidin-5-ones from 4-amino-5-acetylpyrimidines
作者:A. V. Komkov、B. I. Ugrak、V. S. Bogdanov、V. A. Dorokhov
DOI:10.1007/bf00703702
日期:1994.8
New methods for annelation of a pyridine ring to a pyrimidine ring were suggested. Substituted 8H-pyrido[2,3-d]pyrimidin-5-ones (8a-f) were synthesized by the interaction of 2,6-disubstituted 4-amino-5-acetylpyrimidines (1-4) with formamide or acetamide acetals followed by cyclization under the action of sodium methoxide in methanol. 2,4-Disubstituted 7-phenyl-8H-pyrido[2,3-d]pyrimidin-5-ones (11a-c) were prepared by the reaction of 2,6-disubstituted 5-acetyl-4-benzoylaminopyrimidines (10a-c) with MeONa in boiling BuOH.
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作者:A. V. Komkov、V. A. Dorokhov
DOI:10.1023/a:1021304619076
日期:——
A method for the synthesis of methyl and ethyl 2-R-1-4-R-2-5-oxo-5,8-dihydropyrido[2,3-d]pyrimidine-7-carboxylates was proposed. The method is based on condensation of 2-R-1-6-R-2-5-acetyl-4-aminopyrimidines with ethyl oxalate in the presence of MeONa or EtONa. Products of the Friedlander self-condensation of the starting pyrimidines were also obtained.