The rst synthesis and antioxidant and anticholinergic activities of 1-(4,5-dihydroxybenzyl)pyrrolidin-2-one derivative bromophenols including natural products
作者:Rezai, Mohsen、Bayrak, Çetin、Taslimi, Parham、Gülçin, Ilhami、Menzek, Abdullah
DOI:10.3906/kim-1709-34
日期:——
We report herein the first synthesis of biologically active natural bromophenols, namely 1-(2,3,6-tribromo-4,5-dihydroxybenzyl)pyrrolidin-2-one (2), 2RS-1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylic acid (3), and 2RS-methyl 1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylate (4), along with their different derivatives (6 and 8-18). Among the synthesized compounds, , 4, and their derivatives (8 and 9) are yielded in racemic form. Radical scavenging assays of the synthesized molecules were investigated using various bioanalytical antioxidant methods including 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS$^\bullet +})$ and 2,2-diphenyl-1-picrylhydrazyl (DPPH$^\bullet })$. In addition, the reducing power of the novel bromophenols was investigated by Cu$^2+}$-Cu$^+}$ reducing, Fe$^3+}$-Fe$^2+}$ reducing, and [Fe$^3+}$-(TPTZ)$_2}$]$^3+}$-[Fe$^2+}$-(TPTZ)$_2}$]$^2+}$ reducing capacity and ferrous ions (Fe$^2+})$ chelating abilities. The molecules demonstrated powerful antioxidant activities when compared to standard antioxidant compounds of $\alpha $-tocopherol, trolox, butylated hydroxyanisole (BHA), and butylated hydroxytoluene (BHT). Moreover, novel bromophenols were tested against cholinergic enzymes including acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes in the last part of this study. The presented novel bromophenols showed Ki values in the range of 2.60 $\pm $ 0.75-16.36 $\pm $ 2.67 nM against AChE and 13.10 $\pm $ 3.33-54.47 $\pm $ 13.53 nM against BChE.
我们在此报告首次合成了具有生物活性的天然溴酚,即 1-(2,3,6-三溴-4,5-二羟基苄基)吡咯烷-2-酮 (2)、2RS-1-(2,3-二溴-4、5-氧代吡咯烷-2-羧酸(3)、2RS-1-(2,3-二溴-4,5-二羟基苄基)-5-氧代吡咯烷-2-羧酸甲酯(4)以及它们的不同衍生物(6 和 8-18)。在合成的化合物中,4 和它们的衍生物(8 和 9)是以外消旋形式产生的。利用各种生物分析抗氧化方法,包括 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS$^\bullet +})$ 和 2,2-diphenyl-1-picrylhydrazyl (DPPH$^\bullet })$ ,研究了合成分子的自由基清除能力。此外,还通过 Cu$^2+}$-Cu$^+}$ 还原、Fe$^3+}$-Fe$^2+}$ 还原和[Fe$^3+}$-Fe$^2+}$ 还原研究了新型溴酚的还原能力、和 [Fe$^3+}$-(TPTZ)$_2}$]$^3+}$-[Fe$^2+}$-(TPTZ)$_2}$]$^2+}$ 还原能力以及亚铁离子 (Fe$^2+})$ 螯合能力。与标准抗氧化化合物($α-生育酚、trolox、丁基羟基茴香醚(BHA)和丁基羟基甲苯(BHT))相比,这些分子具有强大的抗氧化活性。此外,本研究的最后一部分还测试了新型溴酚类化合物对胆碱能酶的作用,包括乙酰胆碱酯酶(AChE)和丁酰胆碱酯酶(BChE)。所介绍的新型溴苯酚对 AChE 的 Ki 值范围为 2.60 $\pm $ 0.75-16.36 $\pm $ 2.67 nM,对 BChE 的 Ki 值范围为 13.10 $\pm $ 3.33-54.47 $\pm $ 13.53 nM。