Process for preparing polyvalent and physiologically degradable carbohydrate-containing polymers by enzymatic glycosylation reactions and the use thereof for preparing carbohydrate building blocks
First Claim
1. A process for preparing a carbohydrate-containing polymer that is physiologically degradable in vivo in a mammal, wherein said carbohydrate-containing polymer comprises a non-naturally occurring hydrophilic, biodegradable polymer unit, a disaccharide or oligosaccharide unit, and a bifunctional spacer linking said disaccharide or oligosaccharide units to said polymer unit, comprising the steps of:
- (a) covalently linking a monosaccharide or oligosaccharide unit to a spacer to form a monosaccharide or oligosaccharide-spacer complex wherein said spacer has the formula (mono- or oligosaccharide)—
O—
[Q1—
(CH2)p—
Q2]r-(polymer), wherein Q1 is —
CH2or —
CO—
, Q2 is —
NH or —
CO—
NH—
, p is an integer from 1 to 6, and r is 1 or 2;
(b) covalently linking said monosaccharide or oligosaccharide-spacer complex to a non-naturally occurring hydrophilic, biodegradable polymer unit to form an acceptor unit; and
(c) coupling a monosaccharide donor unit to said acceptor unit by enzymatic glycosylation.
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Abstract
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.
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Citations
17 Claims
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1. A process for preparing a carbohydrate-containing polymer that is physiologically degradable in vivo in a mammal, wherein said carbohydrate-containing polymer comprises a non-naturally occurring hydrophilic, biodegradable polymer unit, a disaccharide or oligosaccharide unit, and a bifunctional spacer linking said disaccharide or oligosaccharide units to said polymer unit, comprising the steps of:
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(a) covalently linking a monosaccharide or oligosaccharide unit to a spacer to form a monosaccharide or oligosaccharide-spacer complex wherein said spacer has the formula (mono- or oligosaccharide)—
O—
[Q1—
(CH2)p—
Q2]r-(polymer), wherein Q1 is —
CH2or —
CO—
, Q2 is —
NH or —
CO—
NH—
, p is an integer from 1 to 6, and r is 1 or 2;
(b) covalently linking said monosaccharide or oligosaccharide-spacer complex to a non-naturally occurring hydrophilic, biodegradable polymer unit to form an acceptor unit; and
(c) coupling a monosaccharide donor unit to said acceptor unit by enzymatic glycosylation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A carbohydrate-containing polymer that is physiologically degradable in vivo in a mammal, comprising:
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(a) a non-naturally occurring hydrophilic, biodegradable polymer unit, (b) a disaccharide or oligosaccharide unit, and (c) a bifunctional spacer linking said disaccharide or oligosaccharide units to said biodegradable polymer unit, wherein said spacer has the formula (mono- or oligosaccharide)—
O—
[Q1—
(CH2)p—
Q2]r-(polymer), and wherein Q1 is —
CH2, or —
CO—
, Q2 is —
NH or —
CO—
NH—
, p is an integer from 1 to 6, and r is 1 or 2.
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16. A process for preparing a carbohydrate-containing polymer that is physiologically degradable in vivo in a mammal, wherein said carbohydrate-containing polymer comprises a hydrophilic, biodegradable polymer unit, a disaccharide or oligosaccharide unit, and a bifunctional spacer linking said disaccharide or oligosaccharide units to said polymer unit, comprising the steps of:
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(a) covalently linking a hydrophilic, biodegradable polymer unit to a spacer to form a biodegradable polymer-spacer complex wherein said spacer has the formula (mono- or oligosaccharide)—
O—
[Q1—
(CH2)p—
Q2]r-(polymer), wherein Q1 is —
CH2 or —
CO—
, Q2 is —
NH or —
CO—
NH—
, p is an integer from 1 to 6, and r is 1 or 2;
(b) covalently linking said biodegradable polymer-spacer complex to a monosaccharide or oligosaccharide unit to form an acceptor unit; and
(c) coupling a monosaccharide donor unit to said acceptor unit by enzymatic glycosylation.
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17. A process for preparing a carbohydrate-containing polymer that is physiologically degradable in vivo in a mammal, wherein said carbohydrate-containing polymer comprises a non-naturally occurring hydrophilic, biodegradable polyamino-acid, a disaccharide or oligosaccharide unit, and a bifunctional spacer linking said disaccharide or oligosaccharide units to said polymer unit, comprising the steps of:
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(a) covalently linking a non-naturally occurring hydrophilic, biodegradable polyamino-acid to a spacer to form a biodegradable polymer-spacer complex, wherein said spacer has the formula (mono- or oligosaccharide)—
O—
[Q1—
(CH2)p—
Q2]r-(polymer), wherein Q1 is —
CH2or —
CO—
, Q2 is —
NH or —
CO—
NH—
, p is an integer from 1 to 6, and r is 1 or 2;
(b) covalently linking said biodegradable polyamino-acid-spacer complex to a monosaccharide or oligosaccharide unit to form an acceptor unit; and
(c) coupling a monosaccharide donor unit to said acceptor unit by enzymatic glycosylation.
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Specification