Polymer-supported solution synthesis of oligosaccharides
First Claim
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1. A method for the preparation of oligosaccharides which comprises:
- a) reacting as a first reactant, a saccharide having at least one monosaccharide unit and having a carbohydrate hydroxyl group and as a second reactant a monomethylether of polyethylene glycol linked to a tether having one free hydroxyl group of a benzylic or allylic diol, and the linkage formed between the two reactants is an O-glycosidic linkage or an ether linkage;
b) activating the saccharide-polyethylene glycol derivative reaction product for glycosylation;
c) subjecting the activated saccharide-polyethylene glycol derivative reaction product to a glycosylation reaction through at least one addition of a glycosylating agent, while monitoring the reaction for completion;
d) capping any non-glycosylated hydroxyl with a capping reagent which is more reactive than the glycosylating agent.
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Abstract
The present invention provides improved syntheses of oligosacchairdes. In accordance with preferred embodiments, anomeric specificity in such syntheses can be attained using polymer-supported liquid synthetic design with certain novel diether linkers. The present invention also provides novel strategies for capping imcompletely glycosylated hydroxyls.
43 Citations
35 Claims
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1. A method for the preparation of oligosaccharides which comprises:
- a) reacting as a first reactant, a saccharide having at least one monosaccharide unit and having a carbohydrate hydroxyl group and as a second reactant a monomethylether of polyethylene glycol linked to a tether having one free hydroxyl group of a benzylic or allylic diol, and the linkage formed between the two reactants is an O-glycosidic linkage or an ether linkage;
b) activating the saccharide-polyethylene glycol derivative reaction product for glycosylation; c) subjecting the activated saccharide-polyethylene glycol derivative reaction product to a glycosylation reaction through at least one addition of a glycosylating agent, while monitoring the reaction for completion; d) capping any non-glycosylated hydroxyl with a capping reagent which is more reactive than the glycosylating agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- a) reacting as a first reactant, a saccharide having at least one monosaccharide unit and having a carbohydrate hydroxyl group and as a second reactant a monomethylether of polyethylene glycol linked to a tether having one free hydroxyl group of a benzylic or allylic diol, and the linkage formed between the two reactants is an O-glycosidic linkage or an ether linkage;
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23. The reaction product obtained from:
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a) reacting as a first reactant, a saccharide having at least one monosaccharide unit and having a carbohydrate hydroxyl group and as a second reactant a monomethylether of polyethylene glycol linked to a tether having one free hydroxyl group of a benzylic or allylic diol, and the linkage formed between the two reactants is an O-glycosidic linkage or an ether linkage; b) activating the saccharide-polyethylene glycol derivative reaction product for glycosylation; c) subjecting the activated saccharide-polyethylene glycol derivative reaction product to a glycosylation reaction through at least one addition of a glycosylating agent, while monitoring the reaction for completion; and d) capping any non-glycosylated hydroxyl with a capping reagent which is more reactive than the glycosylating agent. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A composition of formula:
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space="preserve" listing-type="equation">OS--DOX--PEGwherein OS is an oligosaccharide; DOX is an α
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'"'"'-dioxyxylyl ether of formula --O--CH2 (C6 H4)CH2 O--; andPEG is a polyethyleneglycol monomethyl ether having an average molecular weight of from about 5,000 to about 12,000. - View Dependent Claims (34, 35)
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Specification