Polyamine-substituted ligands for use as contrast agents
申请人:Wolf Markus
公开号:US20070202047A1
公开(公告)日:2007-08-30
The present invention relates to a polyamine-substituted ligand for the preparation of a contrast agent derived from a chelating molecule selected from the group consisting of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) and diethylentriamine-pentaacetic acid (DTPA), wherein at least one of the carboxylic groups of the chelating molecule is reacted with an amine of formula HNR
1
R
2
to form an amide bond, wherein R
1
, R
2
are independently selected from the group consisting of H; (CH
2
)
n
—NR
3
R
4
; and R
5
; R
3
, R
4
are independently selected from the group consisting of H; (CH
2
)
m
—NR
6
R
7
; and (CH
2
)
m-1
—CH
3
; R
6
, R
7
are independently selected from the group consisting of H; and (CH
2
)
o-1
—CH
3
; n, m, o are independently 2, 3, or 4; R
5
is of formula
and optionally at least one of the carboxylic groups of the chelating molecule is further reacted with a monoalkylamine having 1 to 18 carbon atoms to form an amide bond; provided that at least one of R
1
, R
2
is other than H. Furthermore, the invention relates to contrast agents for magnetic resonance imaging (MRI) comprising said ligands and in-vivo diagnostic methods based on MRI using said contrast agents.