METHOD FOR PREPARING 1,4,7,10-TETRAAZACYCLODODECANE-1,4,7,10-TETRAACETIC ACID
申请人:Viwit Pharmaceutical Co., Ltd.
公开号:EP3564218A1
公开(公告)日:2019-11-06
Disclosed is a method for preparing 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) of formula (II), comprising the following steps: carrying out an alkylation reaction on cyclen in formula (I) and XCH2COOR in the presence of an acid-binding agent in water; adjusting a pH value to separate out a crude product of DOTA; and recrystallizing. The preparation method of the present invention is applicable to large-scale industrial production of DOTA, the whole process does not need to adopt an ion-exchange resin or low-temperature refrigeration mode for purification, and the purity and yield of the product are higher.
CEST systems exhibiting a concentration independent responsiveness
申请人:Aime Silvio
公开号:US10232060B2
公开(公告)日:2019-03-19
The present invention relates to the use of non-equivalent mobile protons belonging to NMR distinguishable stereoisomers of a CEST agent in a ratiometric based CEST imaging procedure and to Lanthanide (III) complex compounds displaying at least two NMR-distinguishable stereoisomers in solution useful as concentration independent CEST responsive agents.
本发明涉及在基于比率测量的 CEST 成像程序中使用属于 CEST 剂的 NMR 可区分立体异构体的非等价流动质子,以及在溶液中显示至少两种 NMR 可区分立体异构体的镧系 (III) 复合物,可用作浓度无关的 CEST 反应剂。
Dimeric contrast agents
申请人:BRACCO IMAGING S.P.A.
公开号:US10793533B2
公开(公告)日:2020-10-06
The present invention relates to new class of dimeric macrocycles capable of chelating paramagnetic metal ions, their chelated complexes with the paramagnetic metal ions and the use thereof as contrast agents, particularly suitable for Magnetic Resonance Imaging (MRI) analysis.