摘要:
The present invention offers a novel asymmetric double-headed lipid capable of forming a stable, nanometer scale micro-tubular aggregated material of containing a sugar and a carboxylic acid at each end. The present invention is an asymmetric double-headed lipid represented by the general formula
R-NHCO- (CH 2 ) n -COOH (I)
(in the formula, R represents an aldopyranose radical from which the terminal reducing hydroxyl group is excluded and n is from six to twenty) and a hollow micro-tubular aggregated material formed from the asymmetric double-headed lipid. The external diameter of the micro-tubular aggregated material is 10-300 nm, and the length is 0.3-10 µm. The micro-tubular aggregated material can be manufactured by dispersing the asymmetric double-headed lipid described above in water at pH of two to eight, next heating to 80-100°C to dissolve it and then gradually cooling the aqueous solution obtained.
摘要:
The present invention relates to compositions comprising semi-crystalline β-1-4-N-acetylglucosamine polymers (p-GlcNac) and methods utilizing such polymers modulation of vascular structure and/or function. The compositions and methods disclosed are useful for stimulating, in a p-GlcNac concentration-dependent manner, endothelin-1 release, vasoconstriction, and/or reduction in blood flow out of a breached vessel, as well as for contributing to or effecting cessation of bleeding. The methods of the present invention comprise topical administration of materials comprising semi-crystalline p-GlcNac polymers that are free of proteins, and substantially free of single amino acids as well as other organic and inorganic contaminants, and whose constituent monosaccharide sugars are attached in a β-1-4 conformation.
摘要:
The present invention relates to novel crystalline glucosamine sulphate metal salts for use in the treatment of acute and chronic forms of rheumatic and arthritic diseases and of all the pathological conditions originating from metabolic disorders of the osteo-articular tissues. More particularly, the present invention relates to novel crystalline glucosamine sulphate metal salts having low metal content wherein the metal may be either sodium or potassium. The present invention further relates to a solution-based and a solvent-free process for the preparation of the novel crystalline glucosamine sulphate metal salts having low metal content and to pharmaceutical compositions comprising the novel crystalline glucosamine sulphate metal salts having low metal content.
摘要:
This invention relates to reagents and methods for synthesis of biologically active di- and tri-saccharides comprising α-D-Gal(1→3)-D-Gal. In particular the invention provides novel reagents, intermediates and processes for the solution or solid phase synthesis of α-D-galactopyranosyl-(1→3)-D-galactose, and derivatives thereof. In one preferred embodiments the invention provides a protected monosaccharide building block of general formula (II): in which R3 is methoxy or methyl; R1 is H, benzoyl, pivaloyl, , 4-chlorobenzoyl, acetyl, chloroacetyl, levulinoyl, 4-methylbenzoyl, benzyl, 3,4-methylenedioxybenzyl, 4-methoxybenzyl, 4-chlorobenzyl, 4-acetamidobenzyl, or 4-azidobenzyl; and R2 is H, Fmoc, benzoyl, pivaloyl, 4-chlorobenzoyl, acetyl, chloroacetyl, levulinoyl, 4-methylbenzoyl, benzyl, 3,4-methylenedioxybenzyl, 4-methoxybenzyl, 4-chlorobenzyl, 4-acetamidobenzyl, or 4-azidobenzyl.
摘要:
A process for the preparation of 1,5-dideoxy-1,5-imino hexitols of a hexose sugars from novel hydroxyl protected oxime intermediates. The process includes formation of a lactam which is reduced to the hexitol. The hexitols are useful as drugs.
摘要:
Novel agents useful for detecting hypoxic tumor cells are provided. The compounds have structural formula (I), wherein R1 and R¿2? are as defined herein. Methods of using the compounds to detect hypoxic tumor cells are also provided, as are pharmaceutical compositions formulated with the novel compounds.
摘要:
A process for the addition of an azide function to an organic compound in which process a mixture is prepared by adding an epoxide-derivative of the organic compound and an alkali metal azide salt to a solvent is described. The mixture is heated to a reaction temperature at which the epoxide-derivative and the azide can react to form an azide derivative of the organic compound. An amount, near equimolar to the epoxide derivative, of a (1-6C)alkyl-(2-4C)carboxylic acid ester having a boiling point above the reaction temperature is added to the mixture before and/or during the reaction.
摘要:
The invention provides amine-protecting groups for use in solution phase or solid-phase oligosaccharide synthesis, in which a 2-substituted 1,3-dioxo compound is used to protect one or more primary amine groups of an aminosugar or glycosylamine. The invention provides reagents, reagent kits, and methods for solution phase, solid-phase oligosaccharide synthesis.
摘要:
Novel substituted liposaccharides useful in the prophylactic and affirmative treatment of endotoxemia including sepsis, septicemia and various forms of septic shock and methods of using these agents are provided. Also provided are method of preparing these agents and intermediates useful therein.