Chemical Modification of Lactose. XII. Preparation of O-(2-Acetamido-2-deoxy-β-D-glucopyranosyl)-(1→6)-O-β-D-galactopyranosyl-(1→4)-D-glucopyranose (6´-N-Acetylglucosaminyllactose)
The title trisaccharide (16) is a constituent of the higher oligosaccharides in human milk. As part of our program of synthesis of oligosaccharides in human milk, the title trisaccharide was prepared. Heating of a mixture of 1, 6-anhydro-2, 2´, 3, 3´, 4´-penta-O-benzyl-β-lactose and 2-methyl-(3, 4,...
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Published in | Chemical & pharmaceutical bulletin Vol. 27; no. 11; pp. 2564 - 2569 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
The Pharmaceutical Society of Japan
1979
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Subjects | |
Online Access | Get full text |
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Summary: | The title trisaccharide (16) is a constituent of the higher oligosaccharides in human milk. As part of our program of synthesis of oligosaccharides in human milk, the title trisaccharide was prepared. Heating of a mixture of 1, 6-anhydro-2, 2´, 3, 3´, 4´-penta-O-benzyl-β-lactose and 2-methyl-(3, 4, 6-tri-O-acetyl-1, 2-dideoxy-α-D-glucopyrano) [2, 1-d]-2-oxazoline in nitromethane-toluene in the presence of p-toluenesulfonic acid at 95° for 1 hr with stirring afforded the protected 1, 6-anhydro-β-derivative of 16 (6). The protecting groups of 6 were removed by catalytic hydrogenation followed by deacetylation, or vice versa, to afford the 1, 6-anhydro-β-derivative of 16 (9). Compound 9 gave a crystalline peracetate (14). The 1, 6-anhydro-β-ring of 14 was cleaved by mild acetolysis to afford an anomeric mixture of the peracetate of 16, from which the α-anomer (15) was isolated as needles. Deacetylation of 15 gave the title trisaccharide as a hygroscopic amorphous powder. |
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ISSN: | 0009-2363 1347-5223 |
DOI: | 10.1248/cpb.27.2564 |