A convenient and selective route to a <i>trans</i>-difunctionalized macrocyclic hexadentate N<sub>4</sub>O<sub>2</sub> ligand
作者:Hongyan Luo、Robin D Rogers、Martin W Brechbiel
DOI:10.1139/v01-095
日期:2001.7.1
The synthesis and characterization of a novel difunctionalized tetraaza macrocycle, 1,8-bis(2-hydroxybenzyl)- 1,4,8,11-tetraazacyclotetradecane (abbreviated H 2bcyclamb), is described. The diprotic hexadentate ligand N4O2 was conveniently synthesized in two steps by the cyclic condensation reaction of 1,4,8,11-tetraazacyclotetradecane (abbrevi - ated cyclam) and salicylaldehyde, followed by NaBH4 reduction
描述了新型双官能化四氮杂大环 1,8-双 (2-羟基苄基)-1,4,8,11-四氮杂环十四烷 (缩写为 H 2bcyclamb) 的合成和表征。通过 1,4,8,11-四氮杂环十四烷(缩写为 cyclam)和水杨醛的循环缩合反应,然后用 NaBH4 还原环状六氢嘧啶缩合物,可以方便地分两步合成二质子六齿配体 N4O2。双官能化是选择性的,是四氮杂大环反式双官能化的第一个过程,不产生单、三或四官能化产物,只分离出1,8-双官能化产物,并且官能化发生很方便作为脱保护的结果。H2bcyclamb 中两个官能团的反式排列通过铜 (II) 配合物 (Cu(H2bcyclamb))(OAc)2·2H2O 的 X 射线晶体学研究得到验证。晶体为单斜晶系,P21/c,a = 10.0931(2), b = 13.8820(1), c = 10.8752(1) A, β = 106.332(1)°, V =