Synthesis of Oxadiazoles, Thiadiazoles and Triazoles Derived from Benzo[b]thiophene
作者:A. Sharba、R. Al-Bayati、M. Aouad、N. Rezki
DOI:10.3390/10091161
日期:——
In this work 3-chloro-2-chlorocarbonylbenzo[b]thiophene (1) was prepared from cinnamic acid and then converted into the acid hydrazide 2. The azomethines 3a-e were prepared from the corresponding aryl aldehydes and the acid hydrazide 2. Treatment of compound 2 with formic acid gave the N-formyl acid hydrazide 4, which upon refluxing with phosphorous pentoxide or phosphorous pentasulphide in xylene
在这项工作中,3-氯-2-氯羰基苯并[b]噻吩(1)由肉桂酸制备,然后转化为酰肼2。偶氮甲碱3a-e由相应的芳基醛和酰肼2制备。化合物2与甲酸反应得到N-甲酰酰肼4,其与五氧化二磷或五硫化二磷在二甲苯中回流,得到相应的2-(3-氯-1-苯并噻吩-2-基)-1,3,4 -恶二唑(5)和2-(3-氯-1-苯并噻吩-2-基)-1,3,4-噻二唑(6)。1-氨基硫脲 7 与 NaOH 反应导致闭环,得到 5-(3-氯-1-苯并噻吩-2-基)-4H-三唑-3-硫醇 (8),将其转化为多种衍生物 9-12 2与异硫氰酸苯酯和NaOH反应得到5-(3-氯-1-苯并噻吩-2-基)-4-(苯基)-4H-1,2,4-三唑-3-硫醇(14)。