Synthesis of functionalized pyrimidine-4-thiones and derivatives of pyrido[2,3-d]pirimidine-5-one from monoacylketene aminals
作者:V. A. Dorokhov、A. V. Komkov、E. M. Shashkova、V. S. Bogdanov、M. N. Bochkareva
DOI:10.1007/bf00699001
日期:1993.11
give the corresponding thioamides which undergo cyclization by sodium methoxide in methanol to afford 6-R-amino-5-acetyl-2-phenyl-3H-pyrimidine-4-thiones. A scheme for constructing the pyrido[2,3-d]pyrimidine system from keteneaminals is offered. The reaction of 6-R-amino-5-acetyl-2-phenyl-3H-pyrimidine-4-thiones with dimethylformamide dimethylacetal leads to 8-R-N-4-methylthio-8H-pyrido-[2,3-d]pyrimidine-5-ones
含有未取代 NH2 基团的单酰基烯酮缩醛胺作为 C-亲核试剂与异硫氰酸苯甲酰酯反应得到相应的硫代酰胺,然后在甲醇中通过甲醇钠进行环化,得到 6-R-氨基-5-乙酰基-2-苯基-3H-嘧啶-4-硫酮。提供了一种由烯酮胺构建吡啶并[2,3-d]嘧啶系统的方案。6-R-氨基-5-乙酰基-2-苯基-3H-嘧啶-4-硫酮与二甲基甲酰胺二甲基缩醛的反应生成8-RN-4-甲硫基-8H-吡啶并-[2,3-d]嘧啶- 5个。5-乙酰基-6-苯甲酰氨基-4-甲硫基-2-苯基嘧啶被甲醇钠环化产生N-未取代的4-甲硫基-8H-吡啶并-[2,3-d]嘧啶-5-one。