Synthesis of Some 1,3-Thiazole, 1,3,4-Thiadiazole, Pyrazolo[5,1-c]-1,2,4-triazine, and 1,2,4-Triazolo[5,1-c]-1,2,4-triazine Derivatives Based on the Thiazolo[3,2-a]benzimidazole Moiety
作者:Nehal A. Hamdy、Hatem A. Abdel-Aziz、Ahmad M. Farag、Issa M. I. Fakhr
DOI:10.1007/s00706-007-0717-z
日期:2007.10
oxopropionitrile with phenyl isothiocyanate, in the presence of KOH, furnished the corresponding potassium salt which was converted into thioacetanilide derivative upon neutralization. The thioacetanilide derivative reacts with α-chloroacetylacetone and ethyl α-chloroacetoacetate to give the 1,3-thiazole derivatives, while the reaction of the'thioacetanilide derivative with hydrazonyl chlorides gave
通过使3-甲基噻唑并[3,2 - a ]苯并咪唑-2-羧酸乙酯,乙腈和氢化钠回流来合成3-(3-甲基噻唑并[3,2- a ]苯并咪唑-2-基)-3-氧代 丙腈。在KOH存在下,用异硫氰酸苯酯处理3-(3-甲基噻唑并[3,2- a ]苯并咪唑-2-基)-3-氧代丙腈,提供了相应的钾盐,该钾盐在中和后转化为硫代乙酰苯胺衍生物。硫代乙酰苯胺衍生物与α-氯乙酰丙酮和α-氯代乙酰乙酸乙酯反应得到1,3-噻唑衍生物,而硫代乙酰苯胺衍生物与酰肼酰氯反应得到1,3,4-噻二唑衍生物。另一方面,3-(3-甲基噻唑[3,2- a ]苯并咪唑-2-基)-3-氧丙腈与3-苯基-5-氨基-(1 H )-吡唑和5-氨基-1,2,4-(1 H )-三唑的重氮盐反应 生成提供相应的。后面的在吡啶中煮沸后进行分子内环化,得到吡唑并[5,1- c ] -1,2,4-三嗪和1,2,4-三唑并[5,1- c ] -1,2,4 -三嗪衍生物。此外,研究了噻唑并[3,2