S -substituted derivatives of 1,2,4-triazol-3-thiol as new drug candidates for type II diabetes
作者:Ur-Rehman, Aziz、Nafeesa, Khadija、Athar Abbasi, Muhammad、Zahra Siddiqui, Sabahat、Rasool, Shahid、Adnan Ali Shah, Syed、Ashraf, Muhammad、Lodhi, Muhammad Arif、Khan, Farman Ali、Jahan, Bakhat
DOI:10.3906/kim-1705-17
日期:——
The therapeutic applications of 1,2,4-triazoles motivated us to synthesize some new derivatives. Two series of $S$-substituted derivatives (8a-8j, 12a-12i) of 5-$\$1-[(4-chlorophenyl)sulfonyl]-3-piperidinyl$\}$-4-phenyl-4$H$-1,2,4-triazol-3-thiol (6) have been synthesized and evaluated for their biological potential. Using 4-chlorobenzene sulfonyl chloride (1) and ethyl piperidine-3-carboxylate (2), ethyl 1-[(4-chlorophenyl)sulfonyl]piperidine-3-carboxylate (3) was synthesized and converted into 3,4,5-trisubstituted 1,2,4-triazole (6) through formation of the corresponding carbohydrazide (4) and hydrazinecarbothioamide (5). Compound 6 was transformed into 8a-8j by alkyl halides (7a-7j) and into 12a-12i by $N$-aralkyl/aryl-2-bromoacetamides (11a-11i) in an aprotic solvent. The electrophiles, 11a-11i, were synthesized by gearing up $N$-substituted aralkyl/aryl amines (10a-10i) with 2-bromoacetyl bromide (9) under dynamic pH control by aqueous sodium carbonate. Structures were elucidated through the spectral techniques of IR, EIMS, $^1}$H NMR, and $^13}$C NMR. Most of the synthesized derivatives were found to be potent inhibitors of $\alpha $-glucosidase enzyme and even better than acarbose. Acarbose is a reference standard and is a commercially available $\alpha $-glucosidase inhibitor to treat patients with type II diabetes. The low hemolytic activity also emphasized the potential of the synthesized compounds as new drug candidates.
1,2,4-三唑的治疗应用激励我们合成一些新衍生物。合成了两系列的 $S$-取代衍生物(8a-8j,12a-12i),其化学结构为5-$\$1-[(4-氯苯基)磺酰]-3-哌啶基$\}$-4-苯基-4$H$-1,2,4-三唑-3-硫醇(6),并评估了它们的生物活性。通过使用4-氯苯磺酰氯(1)和乙基哌啶-3-羧酸酯(2),合成了乙基1-[(4-氯苯基)磺酰]哌啶-3-羧酸酯(3),并通过形成相应的氨基肼酰(4)和肼基卡巴胺(5)转化为3,4,5-三取代1,2,4-三唑(6)。化合物6通过烷基卤素(7a-7j)转化为8a-8j,并通过$N$-芳基/烷基-2-溴乙酰胺(11a-11i)在无质子溶剂中转化为12a-12i。这些电亲体11a-11i是通过将$N$-取代的芳基/烷基胺(10a-10i)与2-溴乙酰溴(9)在动态pH控制下用碳酸钠溶液合成的。通过红外光谱(IR)、电子离子化质谱(EIMS)、$^1}$H NMR和$^13}$C NMR等光谱技术确定了结构。大多数合成的衍生物被发现是$\alpha $-葡萄糖苷酶的强抑制剂,效果甚至优于阿卡波糖。阿卡波糖是一种参考标准,是一种商业可用的$\alpha $-葡萄糖苷酶抑制剂,用于治疗II型糖尿病患者。低溶血活性也强调了这些合成化合物作为新药候选物的潜力。