Synthesis of Ester Derivatives of 1,4,7-Triazacyclononane-1,4,7-tris(methylenephosphonic Acid) and 1,4,7-Triazacyclononane-1,4,7-tris(methyleneethylphosphinic Acid)
作者:István Lázár、A. Dean Sherry
DOI:10.1055/s-1995-3923
日期:1995.4
Two methods have been developed for the synthesis of new 1,4,7-triazacyclononanetris(methylenephosphonic acid) (3-6, 8-11) and -tris(methyleneethylphosphinic acid) (7, 12) ester derivatives. The first procedure includes the synthesis of 2 in anhydrous THF which can then be used as a useful synthetic intermediate for several new derivatives of 1,4,7-triazacyclononane (1). In the second procedure, compound 1 and dialkyl phosphite or ethyl ethylphosphinate are reacted with paraformaldehyde in refluxing benzene yielding the corresponding esters in good to excellent yield. New macrocyclic complexing agents 8-12 have been prepared by either basic (8-11) or acidic (12) hydrolysis of the corresponding ester derivatives, or directly from the starting macrocycle 12. Side reactions decreasing the yield and purity of the products are also discussed.
开发了两种合成新的1,4,7-三氮杂环壬烯三(亚甲基膦酸)(3-6, 8-11)和三(亚甲基乙基膦酸)(7, 12)酯衍生物的方法。第一种方法包括在无水THF中合成化合物2,该化合物可以作为几种新的1,4,7-三氮杂环壬烯(1)衍生物的有用合成中间体。在第二种方法中,化合物1与二烷基膦酸酯或乙基乙基膦酸酯在回流苯中与聚甲醛反应,得到了相应的酯,产率良好至优异。新型宏环络合剂8-12通过相应酯衍生物的碱性(8-11)或酸性(12)水解,或直接从起始宏环12制备而成。还讨论了减少产物产率和纯度的副反应。