Three step vs one pot synthesis and X-ray crystallographic investigation of heptadentate triamide cyclen (1,4,7,10-tetraazacyclododecane) based ligands and some of their lanthanide ion complexes
作者:Thorfinnur Gunnlaugsson、Joseph P Leonard、Sinead Mulready、Mark Nieuwenhuyzen
DOI:10.1016/j.tet.2003.10.086
日期:2004.1
The synthesis of several lanthanide complexes from the tris alkylated cyclen (1,4,7,10-tetraazacyclododecane) ligands 1 and 2 is described. The syntheses of 1 and 2 were investigated by means of two different synthetic routes (Method 1 and Method 2). The first of these involves the mono protection of cyclen using 4-methoxyphenylsulfonyl chloride, followed by alkylation of the remaining three secondary
描述了由三烷基化的环(1,4,7,10-四氮杂环十二烷)配体1和2合成几种镧系元素络合物。的合成1和2分别由两个不同的合成路线(方法1和方法2)的方法,研究。这些中的第一个涉及使用4-甲氧基苯基磺酰氯对环素进行单保护,然后将环素的剩余三个仲胺烷基化,并使用溶剂化的Na进行脱保护。使用这种方法,仅成功形成了1个。中间体9和相应的La(III)配合物9.La的X射线晶体结构被表达。第二种方法涉及在一个步骤中直接合成两个配体。显示了这些配体之一的Eu(III)配合物的X射线晶体学。而方法1产生的产物1纯度高,但总产率低,方法2的两个配体的产率更高(两种配体的产率均为50%)。