New Routes to Pyridino[2,3-d]pyrimidin-4-one and Pyridino-[2,3-d]triazolino[4,5-a]pyrimidin-5-one Derivatives
作者:Hamdi Hassneen、Tayseer Abdallah
DOI:10.3390/80300333
日期:——
-one (2) and 7-amino-1,3-diphenyl-1,2,4-triazolo[4,3-a]pyrimidin-4-one (13) with dimethylformamide dimethyl- acetal (DMFDMA). Compound 5 reacts with acetophenone and 2-acetylthiophene to give the 2-thioxo-1,3-dihydropyridino[2,3-d]pyrimidin-4-ones 3a and 3b, respectively. Compounds 3a,b react with hydrazonoyl halides 6,7 to give pyridino[2,3-d]triazolo[4,5-a]pyrimidin-4-ones 11a-d and not the isomeric
2-Thioxopyrimidinyl-5-(N,N-二甲基氨基)甲脒(5)和1,3-二苯基三唑并[3,4-d]嘧啶-N,N-二甲基甲脒(14)是通过6-氨基-2缩合制备的-thioxo-1,3-dihydropyrimidin-4-one (2) 和 7-amino-1,3-diphenyl-1,2,4-triazolo[4,3-a]pyrimidin-4-one (13) 与二甲基甲酰胺二甲基缩醛 (DMFDMA)。化合物 5 与苯乙酮和 2-乙酰噻吩反应,分别生成 2-thioxo-1,3-dihydropyridino[2,3-d]pyrimidin-4-ones 3a 和 3b。化合物 3a,b 与腙酰卤 6,7 反应得到吡啶并[2,3-d]三唑并[4,5-a]嘧啶-4-酮 11a-d,而不是异构结构 12a-d。14 型甲脒与氰基乙酸乙酯、丙二腈和苯甲酰乙腈反应生成 1,3-二苯基-3a-氢吡啶基[2