Synthesis and anti-oxidant activity evaluation of (±)-Anastatins A, B and their analogs
作者:Guojun Pan、Xuehui Li、Long Zhao、Meng Wu、Chao Su、Xuzhe Li、Yongmin Zhang、Peng Yu、Yuou Teng、Kui Lu
DOI:10.1016/j.ejmech.2017.06.054
日期:2017.9
(±)-Anastatins A and B as well as 14 analogs, which containing a benzofuran moiety, were synthesized by using halogenation, Suzuki coupling reaction and an oxidation/Oxa-Michael reaction cascade as the key steps. The structures of the new flavonoids were confirmed by 1H NMR, 13C NMR and HRMS. The antioxidant activities of them as well as the key intermediates were evaluated by ferric reducing antioxidant power (FRAP)
以卤代,Suzuki偶联反应和氧化/ Oxa-Michael反应级联为关键步骤,合成了两个新的类黄酮(±)-Anastatins A和B以及14个类似物,它们含有苯并呋喃部分。新的类黄酮的结构通过1 H NMR,13 C NMR和HRMS确认。通过三价铁还原抗氧化剂功率(FRAP)分析评估了它们以及主要中间体的抗氧化活性,并在过氧化氢(H 2 O 2)引起的氧化损伤的PC12细胞模型中评估了活性化合物。SAR研究表明,对于体外抗氧化剂的活性,金酮衍生物显示出比黄酮对应物更好的生物活性。然而,环化成苯并呋喃并通过双键将两个共轭部分连接成一个整体共轭体系,降低了体外抗氧化活性。其中,最有效的化合物24c显着降低了H 2 O 2引起的细胞损伤。H 2 O 2损伤的PC12细胞的凋亡率(Annexin V +)为60.7%,而化合物24c处理的细胞在10μM和100μM时分别降低至5.9%和4.1%。