Abstract: The invention relates to derivatives with a uronic acid structure having substituents selected among a reactive group, a functionalisable group and --OH functions blocked by protective groups. These derivatives are useful for preparing glycosides, particularly enzyme substrates.

Abstract: Novel processes for synthesizing acid mucopolysaccharide fragments having from 2-12 saccharides and substantially pure products of a single structure produced thereby. Condensation are disclosed between a first protected saccharide and a second protected saccharide to form a protected condensation product having units linked in the manner found in chondroitin sulfate and dermatan sulfate and having protecting groups thereon which allow selective positioning of functional groups, in particular sulfate, at desired positions. Other condensations are disclosed in which a protected condensation product is formed which can be elongated, and has protecting groups thereon which allow selective positioning of functional groups, in particular sulfate, at desired positions. Also disclosed is a process for selectively positioning functional groups on a protected acid mucopolysaccharide having from 2-12 units.

Abstract: The invention relates to a process for the organic synthesis of oligosaccharides constituting or comprising fragments of acid mucopolysaccharides comprising the reaction of two compounds constituted or terminated by units of glucosamine structure and of uronic acid structure respectively, said units being specifically substituted. This process particularly enables valuable anticoagulant drugs to be obtained.

Abstract: The oligosaccharides of the invention contain or are constituted by a tetrasaccharide enchainment of the formula: ##STR1## in which R.sub.1 represents an organic anion, R.sub.2 is identical to R.sub.1 or represents a hydrogen atom, N.sub.1 and N.sub.2 represent a functional amino group.