Synthesis of polyazaheterocycles containing linearly bound 1,2,4-thiadiazole using enaminones
作者:Kh. S. Shikhaliev、P. S. Romanov、A. S. Shestakov、N. V. Stolpovskaya、M. Yu. Krysin、A. Yu. Potapov、A. N. Proshin
DOI:10.1007/s11172-016-1404-1
日期:2016.4
A reaction of N-substituted 5-amino-3-(2-oxopropyl)-1,2,4-thiadiazoles with dimethylformamide dimethyl acetal gave 3-(5-amino-1,2,4-thiadiazol-3-yl)-4-(dimethylamino)but-3en-2-ones, whose cyclization with hydrazine, guanidine, 1H-pyrazol-5-amines and 6-aminopyrimidin-4(3H)-ones led to 3-methyl-1H-pyrazole, 4-methylpyrimidin-2-amine, 5-methyl3-arylpyrazolo[1,5-a]pyrimidines, and 5-methyl-2-R-pyrido[2
N-取代的 5-氨基-3-(2-氧代丙基)-1,2,4-噻二唑与二甲基甲酰胺二甲基乙缩醛反应得到 3-(5-氨基-1,2,4-噻二唑-3-基)- 4-(二甲氨基)but-3en-2-ones,其与肼、胍、1H-pyrazol-5-amines 和 6-aminopyrimidin-4(3H)-ones 环化生成 3-methyl-1H-pyrazole, 4-甲基嘧啶-2-胺、5-甲基3-芳基吡唑并[1,5-a]嘧啶和含有5-氨基的5-甲基-2-R-吡啶并[2,3-d]嘧啶-4(3H)-酮-1,2,4-噻二唑片段在位置 3 处线性结合。