Synthesis and Structure-Activity Relationship of 1-(2-Furoyl)Piperazine Bearing Benzamides as Butyrylcholinesterase Inhibitors
作者:M. A. Abbasi、M. Irshad、Aziz-ur-Rehman、S. Z. Siddiqui、H. M. Junaid、S. A. A. Shah、M. Ashraf
DOI:10.1007/s11094-020-02247-2
日期:2020.9
Four benzamide derivatives (5a, 5b, 8a, 8b) bearing heterocyclic furan and piperazine ring have been synthesized and evaluated for enzyme inhibition and hemolytic activity. Initial 4-(chloromethyl)benzoyl chloride (1) and 3-(chloromethyl)benzoyl chloride (6) were stirred with benzyl amine (2a) and cyclohexyl amine (2b), respectively, in aqueous medium at pH 9 – 10 maintained by aqueous sodium carbonate. The resulting benzamides (3a, 3b, 7a, 7b) were refluxed with 1-(2-furoyl)piperazine (4) in the presence of K2CO3 and CH3CN to acquire target compounds (5a, 5b, 8a, 8b). The spectroscopic techniques including 13C NMR, 1H NMR, IR and EI-MS corroborated the proposed molecular structures of final compounds. Among these, two compounds (5b, 8b) proved to be considerable inhibitors of butyrylcholinesterase enzyme. Study of the hemolytic activity potential revealed low toxicity level of compound 5b.
合成并评估了四种含有杂环呋喃和哌嗪环的苯酰胺衍生物(5a、5b、8a、8b)的酶抑制和溶血活性。初始的4-(氯甲基)苯甲酰氯(1)和3-(氯甲基)苯甲酰氯(6)分别与苄胺(2a)和环己胺(2b)在pH 9-10的水相中搅拌,pH由水合碳酸钠维持。得到的苯酰胺(3a、3b、7a、7b)与1-(2-呋喃酰)哌嗪(4)在K2CO3和CH3CN的存在下回流,以获得目标化合物(5a、5b、8a、8b)。包括13C NMR、1H NMR、IR和EI-MS在内的光谱技术证实了最终化合物的分子结构。在这些化合物中,两个化合物(5b、8b)被证明是丁酰胆碱酯酶的显著抑制剂。溶血活性潜力的研究显示化合物5b的毒性水平较低。