Synthesis and characterization of a 13-member macrocycle functionalized by tyramine arms: Complexation with Cu2+ and antioxidant capacity
作者:Luis Miguel López-Martínez、Hisila Santacruz-Ortega、Rosa Elena Navarro、Motomichi Inoue、Rocío Sugich-Miranda、Javier Hernández-Paredes、Ivan Castillo、Rogerio R. Sotelo-Mundo
DOI:10.1016/j.poly.2016.10.028
日期:2017.5
atoms of the macrocyclic ring; a carbonyl oxygen atom from a pendant arm occupies an axial site to construct a square pyramid. UV–Vis spectrometric titrations in aqueous solutions indicate the formation of a binuclear complex [Cu 2 (L13Tyra – 4H)(H 2 O) x ] 0 in which phenolate oxygen atoms of the tyramine arms coordinate a Cu 2+ ion in addition to the coordination of the macrocyclic chelate; such
摘要通过酰胺键连接的带有酪胺臂的新型大环化合物2,2'-(2,9-dioxo-1,4,7,10-四氮杂环十三烷-4,7-二基)双(N-(4-羟基苯乙基)乙酰胺)缩写为L13Tyra,已在微波反应器中与酰胺偶联剂合成。该大环涉及两个潜在的金属配位和生物活性位点,即四氮杂-大环环(氨基氮的碱度低)和苯酚侧链(p K a 8.6小)。Cu 2+络合物在固体和溶液中具有不同的组成。X射线晶体研究表明,单核络合物[Cu(L13Tyra – 2H)] 0的形成是两个大环上去质子化的酰胺氮和两个氨基氮原子的平方配位。来自悬臂的羰基氧原子占据一个轴向位点,以构成一个方形金字塔。水溶液中的UV-Vis光谱滴定表明,双核络合物[Cu 2(L13Tyra – 4H)(H 2 O)x] 0的形成,其中酪胺臂上的酚盐氧原子与Cu 2+离子配位。大环螯合物的配位;这样的双核结构仅在溶液中保持。由于酪胺臂中的酚羟基,未