Synthesis of derivatives of 4-alkylthiouracil, cytosine, pyrido[2,3-d]pyrimidine, and pyrimido[4,5-d]pyrimidine from the N,S- and N,N-acetals of diacetylketene and isocyanates
作者:V. A. Dorokhov、M. F. Gordeev、A. V. Komkov、V. S. Bogdanov
DOI:10.1007/bf00961050
日期:1991.11
The action of alkyl and aryl isocyanates on the N,S-acetals of diacetylketene leads to the formation of 4-alkylthio-5-acetyl-1-alkyl(aryl)-6-methyl-1H-pyrimidin-2-ones (derivatives of 4-alkylthiouracils). The reaction of the synthesized thiouracils with amines or the reaction of the N,N-acetals of diacetylketene (N,N-ADK) with an equimolar amount of aryl isocyanates leads to the formation of substituted 4-amino-5-acetyl-1H-pyrimidin-2-ones derivatives of cytosine). From the latter and isocyanates or directly from N,N-ADK and an excess of the isocyanate, derivatives of 4-methylene-1H,3H,4H-pyrimido[4,5-d]pyrimidine-2,7-dione were obtained. The exception was the condensation of 3-[N-(4,6-dimethyl-2-pyrimidinyl)diaminomethylene]pentane-2,4-dione with aryl isocyanates, which led to 3H,8H-pyrido[2,3-d]pyrimidine-2,5-diones.
Synthesis of new pyrimido[4,5-d]pyrimidine derivatives from 5-acetyl-6-methyl-4-methylsulfanylpyrimidine-2(1H)-thiones and guanidine
作者:A. V. Komkov、S. V. Baranin、V. A. Dorokhov
DOI:10.1007/s11172-014-0454-5
日期:2014.2
Reactions of 5-acetyl-1-aryl(alkyl)-6-methyl-4-methylsulfanylpyrimidine-2(1H)-thiones (prepared from diacetylketene N,S-acetal) with guanidine afforded 3-alkyl- and 3-aryl-7-amino-5-methyl-4-methylidene-3,4-dihydropyrimido[4,5-d]pyrimidine-2(1H)-thiones. By-products of these reactions (5-acetyl-1-alkyl(aryl)-6-methyl-2-thiouracils) can also be obtained from the starting pyrimidinethiones and EtONa in EtOH. Pyrimidopyrimidinethiones can react with MeOH at the methylidene group in the presence of MeONa.
Synthesis of new 5-hydroxyquinazoline derivatives from functionalized 5-acetyl-6-methylpyrimidines
作者:Alexander V. Komkov、Mikhail A. Kozlov、Yurii A. Linitskii、Leonid S. Vasil’ev、Andrey S. Dmitrenok、Igor V. Zavarzin
DOI:10.1007/s10593-021-02981-9
日期:2021.8
A new method for the synthesis of quinazolines based on the annulation of the benzene ring to 5-acetyl-6 methylpyrimidin-2-one(thione) derivatives has been proposed. Condensation of the latter at the methyl group with dimethylformamide dimethyl acetal in boiling PhH leads to the formation of 5-acetyl-6-[2-(dimethylamino)vinyl]pyrimidin-2-ones(thiones), which, when boiled with MeONa in MeOH, cyclize