摘要:
A process for preparing polyvalent, physiologically degradable carbohydrate-containing polymers by enzymatic glycosylation reactions is described. The carbohydrate-containing polymers thus prepared may be used for preparing carbohydrate building blocks. The polyvalent carbohydrate-containing polymers of the invention cause no intolerance reactions in vivo, either in their intact form or in the form of degradation products. The carbohydrate side chain of the carbohydrate-containing polymer is assembled by enzymatic glycosylation reactions in homogeneous aqueous buffer systems directly on a biodegradable polymer. The yields of the glycosylation reaction are significantly improved over known processes, and are often quantitative. This also provides a significant increase in the loading densities. A process for preparing free oligosaccharides by means of the carbohydrate-containing polymers of the invention is also described.
摘要:
Polymer-based polyvalent malonic acid derivatives having anti-adhesive properties are described. The compounds comprise a polyamino acid linked to a group of formula (I). In formula (I), R.sup.1 and R.sup.2 together form a six-membered carbocylic or heterocyclic ring, containing at least one substituent selected from R.sup.4, R.sup.5, and R.sup.6. R.sup.3 is H, (CH.sub.2) .sub.m X or CH.sub.2 O(CH.sub.2).sup.m X.sup.1. The polyamino acid and the group of formula II are linked via R.sup.4, R.sup.5, or R.sup.6, or optionally via a spacer of formula --�Q.sup.1 --(CH.sub.2).sub.p --Q.sup.2 --!.sub.r. A and B independently are O, S, NH, HN--CO, OC--NH, O--CO, OC--O, NH--CO--O, --O--CO--NH, S--CO, SC--O, O--CS--S, S--CS--OS, NH--CS--S, S--CS--NH, or CH.sub.2. Z is a pyranose, furanose, open-chain polyalcohol or Y--X.sup.6. Y is --O--(CX.sup.2,X.sup.3).sub.n, -(CX.sup.2,X.sup.3).sub.n, --CH.sub.2 --(CX.sup.2,X.sup.3).sub.n or a saturated or unsaturated six-membered carbo- or heterocyclic group having at least one substituent R.sup.9, or a combination of the chain --O--(CX.sup.2,X.sup.3).sub.n, or -(CX.sup.2,X.sup.3).sub.n, and the carbocyclic or heterocyclic group, in which R.sup.4, R.sup.5, and R.sup.6 independently are H, OH, --O--(CH.sub.2) .sub.q X.sup.4, --CH.sub.2 O(CH.sub.2) .sub.q X.sup.5, or HNC(O)CH.sub.3, and X, X.sup.1, X.sup.2, and X.sup.3 independently are H, NH.sub.2, COOH, OH, CH.sub.2 OH, CH.sub.2 NH.sub.2, C.sub.1 -C.sub.20 -alkyl, or C.sub.6 -C.sub.10 -aryl, X.sup.4 and X.sup.5 independently are --NH-- or --O--, and X.sup.6 is OH or --C(R.sup.3) (COOH).sub.2. m, n, and q independently can be 1-20. In the linker, Q.sup.1 is CH.sub.2 or --CO--, Q.sup.2 is --NH-- or --CO--NH--, p is 1-6, and r is 0 or 1. Methods of preparing the compounds, and their use as medicaments or diagnostic agents also are disclosed. ##STR1##
摘要:
The invention relates to malonic acid derivatives, which inhibit the binding of selectin to carbohydrate ligands, and pharmaceutical compositions and diagnostic agents containing these derivatives, and methods for using these pharmaceutical compositions and diagnostic agents.
摘要:
The invention relates to carbohydrate mimetics, which inhibit the binding of selectin to carbohydrate ligands, of the formula I ##STR1## excluding the compounds sialyl-Lewis-X and -A and their derivatives which, instead of an N-acetyl group, carry the substituents N.sub.3, NH.sub.2 or OH or which, instead of fucose, carry glycerol,and pharmaceutical compositions and diagnostic agents containing these derivatives, and methods for using these pharmaceutical compositions and diagnostic agents.
摘要:
The invention relates to multiply fucosylated dicarboxylic acid derivatives possessing antiadhesive properties, to a process for preparing them, to their use, and to pharmaceuticals and diagnostic agents which are prepared from these derivatives. These multiply fucosylated dicarboxylic acid derivatives are suitable for preparing pharmaceuticals or diagnostic agents for diseases which are associated with an excessive, selectin receptor-mediated cell adhesion in the tissue which is affected by the disease.
摘要:
The present invention relates to an improved process for isolating and purifying sugar nucleotides, in particular cytidine monophosphate-activated N-acetylneuraminic acid (CMP-Nana), from biological sources. The sugar nucleotides can be obtained from a sugar nucleotide-containing solution, which has been freed of proteins by alcoholic precipitation, by means of an improved column-chromatographic method which uses silica gel as the stationary phase, and at a purity level which requires only a subsequent desalting step to obtain a substantially pure product.
摘要:
The invention relates to novel conjugates of tetrasaccharides, preferably of sialyl-Lewis X (SLeX) and sialyl-Lewis A (SLeA), having improved activity as inhibitors of cell adhesion, a process for the preparation of these compounds, and their use as pharmacological active compounds and as diagnostics and pharmaceuticals which contain these conjugates.
摘要:
Carbohydrate-containing polymers which can have an HLB* of from about 10 to about 20 are disclosed. The compounds comprise a hydrophilic polymer portion, a carbohydrate portion comprising from 1 to about 20 naturally occurring, identical or different, monosaccharide units, at least one bifunctional spacer coupling the carbohydrate portion to the hydrophilic polymer portion, and a potentiator moiety. The potentiator moiety can be is a crosslinking moiety located within the hydrophilic polymer or a hydrophobic, hydrophilic or ionic moiety. Processes for the preparation and use of such polymers are also disclosed.
摘要:
Carbohydrate-containing polymers which can have an HLB* of from about 10 to about 20 are disclosed. The compounds comprise a hydrophilic polymer portion, a carbohydrate portion comprising from 1 to about 20 naturally occurring, identical or different, monosaccharide units, at least one bifunctional spacer coupling the carbohydrate portion to the hydrophilic polymer portion, and a potentiator moiety. The potentiator moiety can be is a crosslinking moiety located within the hydrophilic polymer or a hydrophobic, hydrophilic or ionic moiety. Processes for the preparation and use of such polymers are also disclosed.
摘要:
The invention relates to the compounds of formula (I) and physiologically acceptable salts thereof. The compounds are suitable, e.g., for treating hyperglycemia.