Due to outstanding biological activities of 1,3,4-oxadiazole, a series of S-substituted derivatives of 5-[1-(4-tosyl)piperidin-4-yl]-1,3,4-oxadiazol-2-thiol (5a-f) was synthesized. The reaction of p-toluene sulfonyl chloride (a) with ethyl isonepacotate (b) produced ethyl 1-(4-tosyl)piperidin-4-carboxylate (1) which was successively converted to 1-(4-tosyl)piperidin-4-carbohydrazide (2) by hydrazine and 5-[1-(4-tosyl)piperidin-4-yl]-1,3,4-oxadiazol-2-thiol (3) by CS2 in the presence of KOH. The aimed compounds (5a-f) were synthesized by the reaction of compound 3 with different electrophiles in DMF using lithium hydride as catalyst. The structural confirmation was done by IR, 1H NMR & EI-MS spectral analysis. The synthesized compounds were screened against a-glucosidase enzyme and five Gram bacterial strains.
由于 1,3,4-恶二唑具有出色的
生物活性,我们合成了一系列 5-[1-(4-对
甲苯磺酰基)
哌啶-4-基]-1,3,4-恶二唑-2-
硫醇的 S 取代衍
生物 (5a-f)。
对甲苯磺酰氯(a)与
异柠檬酸乙酯(b)反应生成 1-(4-对
甲苯磺酰基)
哌啶-4-
羧酸乙酯(1),
肼将其转化为 1-(4-对
甲苯磺酰基)
哌啶-4-甲酰
肼(2),CS2 在 KOH 存在下将其转化为 5-[1-(4-对
甲苯磺酰基)
哌啶-4-基]-1,3,4-恶二唑-2-
硫醇(3)。以氢化
锂为催化剂,化合物 3 与不同的亲电体在
DMF 中发生反应,合成了目的化合物(5a-f)。通过红外光谱、1H NMR & 和 EI-MS 光谱分析确认了化合物的结构。针对 a-
葡萄糖苷酶和五种革兰氏细菌菌株对合成的化合物进行了筛选。