摘要:
Blood pool imaging contrast agents containing paramagnetic bi- and tri-valent metal ion chelates of bile acid conjugates with molecules having chelating activity are used in magnetic resonance imaging of the vascular system and particularly the coronaries.
摘要:
A process for the preparation of compounds of general formula (I) ##STR1## characterized in that the corresponding derivatives of general formula (II) ##STR2## are reacted with the compounds of general formula (III) ##STR3## wherein Z is halogen atom or a reactive residue of a sulfonic acid or a --N.sup.+ (R.sub.9).sub.3 cation wherein R.sub.9 is a (C.sub.1 -C.sub.6) alkyl group and R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 R.sub.6 R.sub.7 and R.sub.8 are as herein defined.
摘要:
A process for the preparation of the compounds of general formula (I) in which R1 is H or OH; R2 is H, &agr;-OH, or &bgr;-OH; and R3 is a straight or branched C1-C4 alkyl group or a benzyl group, comprising the reduction of compounds of formula (III) wherein R1, R2 and R3 have the same meanings as in formula I, in the presence of sodium borohydride.
摘要:
This invention relates to novel compounds able to chelate paramagnetic bi- or trivalent metal ions, their chelates with said metal ions and their use as contrast agents in magnetic resonance imaging (MRI).
摘要:
A process for the preparation of the compounds of general formula (I) in which R1 is H or OH; R2 is H, &agr;-OH, or &bgr;-OH; and R3 is a straight or branched C1-C4 alkyl group or a benzyl group, comprising the reduction of compounds of formula (III) wherein R1, R2 and R3 have the same meanings as in formula I, in the presence of sodium borohydride.
摘要:
R.sub.2, R.sub.2 ', R.sub.3, and R.sub.3 ', which are the same or different, are one of the groups of formula --CH.sub.2 CH.sub.2 OH, --CH.sub.2 CH(OH) CH.sub.2 OH --CH(CH.sub.2 OH)CH(OH)CH.sub.2 OH, --CH.sub.2 (CHOH).sub.4 CH.sub.2 OH, or --CH(CH.sub.2 OH).sub.2 ; and X is one of the groups --CH(OH)--, --CH(CH.sub.2 OH)--, --C(OH) (CH.sub.2 OH)--, or --C(CH.sub.2 OH).sub.2 --, are useful as opacifying components for X-ray contrast media.
摘要:
The invention relates to a process for the preparation of a compound of formula (I), wherein R represents a 2,3-dihydroxy-1-propyl or a 1,3-dihydroxy-2-propyl radical, via direct amidation of a dialkyl ester of 5-amino-1,3-benzenedicarboxylic acid of formula (V), wherein R1 represents a straight or branched (C1-C4)-alkyl group, with at least the stoichiometric amount of an amine of formula H2NR.
摘要:
Compounds of the formula when chelated with metals exhibit improved serum relaxivity and are used in magnetic resonance imaging, particularly for imaging the blood pool.
摘要:
A process for the preparation of (S)-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxo-propyl)amino]-2,4,6-triiodo-1,3-benzendicarboxamide (iopamidol) starting from 5-amino-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-2,4,6-triiodo-1,3-benzenedicarboxamide (II) which process comprises a) reacting the compound of formula (II) with a suitable protecting agent, to give a compound of formula (III) wherein R is a group of formula A or B wherein R1 is a hydrogen atom, a C1÷C4 straight or branched alkoxy group, R2 is hydrogen, a C1÷C4 straight or branched alkoxy group and R3 ?is a C1÷C4 straight or branched alkyl group, a trifuoromethyl or a trichloromethyl group; b) acylating the amino group in position 5 of the intermediate compound of formula (III), by reaction with a (S)-2-(acetyloxy)propanoyl chloride to give a compound of formula (IV) wherein R is as defined above; and c) removing all the acyl groups present in the compound of formula (IV) under basic conditions, with prior cleavage of the cyclic protections of the hydroxy groups in the carboxamido substituents under acidic conditions, when R is a group of formula A carboxamido hydroxy groups under acidic conditions. The invention also refers to the new intermediates of formula (III) and (IV) wherein —R is a group A.