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- W2023931489 abstract "Anomerically enriched diphenyl hexopyranosyl phosphate triesters have been prepared from O-alkyl and -acylated hexopyranoses, using diphenyl chlorophosphate and 4-N,N-dimethylaminopyridine. Glycosyl phosphate triesters of d-gluco-, d-galacto, d-manno, 2-acetamido-2-deoxy-d-gluco-, l-fuco-, and l-rhamno-pyranosyl derivatives have been obtained by this procedure. At temperatures 0° and above, and under thermodynamic control, diphenyl glycosyl phosphates cis to the pyranosyl C-2-substituent are formed predominantly, whereas at low temperatures and under kinetic control, glycosyl phosphate triesters having 1,2-trans stereochemistry are obtained. The β-glycosyl phosphate triesters of d-glucose and d-galactose derivatives are unstable and undergo anomerization to the α-glycosyl phosphate triesters, in contrast to the stable β-phosphate derivatives of l-rhamnose and d-mannose. These phosphate triesters have been deprotected to glycosyl phosphate triethylammonium salts, suitable for the preparation of other key biological derivatives, such as nucleotide sugars. In addition, the diphenyl phosphate groups at the anomeric center have been displaced by azide to give the glycosyl azides, key intermediates in the synthesis of glycosyl amino acids." @default.
- W2023931489 created "2016-06-24" @default.
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- W2023931489 date "1992-01-01" @default.
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- W2023931489 title "Synthesis of glycosyl phosphates and azides" @default.
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- W2023931489 doi "https://doi.org/10.1016/0008-6215(92)80015-s" @default.
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