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.
由二乙酰基乙烯酮N,S-乙缩醛制备的5-乙酰基-1-芳基(烷基)-6-甲基-4-甲硫基嘧啶-2(1H)-硫酮与胍反应,生成3-烷基和3-芳基-7-氨基-5-甲基-4-亚甲基-3,4-二氢嘧啶并[4,5-d]嘧啶-2(1H)-硫酮。这些反应的副产物(5-乙酰基-1-烷基(芳基)-6-甲基-2-硫尿嘧啶)也可从起始嘧啶硫酮和EtONa在乙醇中得到。嘧啶并嘧啶硫酮在MeONa存在下可与甲醇在亚甲基部位发生反应。