PROCESS FOR PREPARATION OF DIETHYLENETRIAMINEPENTAACETIC ACID DERIVATIVE, AND DIETHYLENETRIAMINEPENTAACETIC ACID DERIVATIVE
申请人:Nemoto Hisao
公开号:US20120203027A1
公开(公告)日:2012-08-09
The objective of the present invention is to provide a process for simple and efficient preparation of an intermediate compound to synthesize a gadolinium complex having a substituent for improving a retention property in blood time and specificity to an intended organ. The objective of the present invention is also to provide an intermediate compound produced by the said production process. The process for preparation of the diethylenetriaminepentaacetic acid derivative (I):
wherein R
1
to R
5
are independently C
1-6
alkyl groups;
comprising the steps of:
reacting a diethylenetriaminepentaacetic acid pentaester with a halogenated ally compound in an aprotic solvent;
removing the excess halogenated ally compound (III); and
reacting a reaction product of the diethylenetriaminepentaacetic acid pentaester and the halogenated ally compound with a base in a solvent.
本发明的目的是提供一种简单高效的制备中间化合物的方法,以合成具有改善在血液中滞留时间和对特定器官的特异性的取代基的钆配合物。本发明的目的还在于提供由所述生产过程产生的中间化合物。制备二乙烯三胺五乙酸酯衍生物(I)的方法:其中R1至R5独立为C1-6烷基基团;包括以下步骤:在无极性溶剂中将二乙烯三胺五乙酸五酯与卤代烯丙基化合物反应;去除过量的卤代烯丙基化合物(III);并在溶剂中将二乙烯三胺五乙酸五酯和卤代烯丙基化合物的反应产物与碱反应。