Contrast Agents Endowed with High Relaxivity for Use in Magnetic Resonance Imaging (Mri) Which Contain a Chelating Moiety with Polyhydroxylated Substituents
申请人:Aime Silvio
公开号:US20070258905A1
公开(公告)日:2007-11-08
The present invention relates to a new class of paramagnetic ion-based contrast agents of molecular weight lower than 3.5 kDa that show a pharmacokinetic profile analogous to that of the commonly used T1-general extravascular agents and that are further characterized by a higher relaxivity.
The present invention relates to a novel class of paramagnetic ion-based contrast agents of formula (I), wherein a chelating backbone moiety is highly functionalized by the presence of one or more polyhydroxylated chain, that show a pharmacokinetic profile analogous to that of the commonly used T1-general extravascular agents (NSA) but are further characterized by a higher relaxivity.
Method of preparation of 6-azido-2,4-diacetamido-2,4,6-trideoxy-D-mannose
申请人:Centre national de la recherche scientifique
公开号:US10640526B2
公开(公告)日:2020-05-05
Disclosed is a method of preparation of 6-azido-2,4-diacetamido-2,4,6-trideoxy-D-mannose. This method includes the chemical reaction of compound of formula X:
Wherein: R1 can be a C1 to C6 alkyl including methyl, ethyl, isopropyl; aryl including phenyl; each of these groups being substituted or not; and R2 can be a C1 to C6 alkyl including methyl, ethyl, isopropyl, tert-butyl, isobutyl; each of these groups being substituted or not; with a deprotecting reagent including a Lewis or Brönsted acid in a polar aprotic solvent, thereby obtaining a free C-1 OH group. The method can also start with the preparation from commercially available D-galactose pentaacetate, D-galactose tetraacetate or tetraacetyl D-galactosyl trichloroacetimidate. The step of deprotecting the anomeric position avoids the use of cerium and allows the easy purification of 6-azido-2,4-diacetamido-2,4,6-trideoxy-D-mannose.
CONTRAST AGENTS ENDOWED WITH HIGH RELAXIVITY FOR USE IN MAGNETIC RESONANCE IMAGING (MRI) WHICH CONTAIN A CHELATING MOIETY WITH POLYHYDROXYLATED SUBSTITUENTS