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Synthesis of 5-hydroxy-2-(β- d-ribofuranosyl)pyran-4-one from a pyranulose glycoside
The synthesis of 5-hydroxy-2-(β- d-ribofuranosyl)pyran-4-one ( 9) is described. Treatment of pyranulose glycoside with bromine in carbon tetrachloride afforded brompyranulose glycoside in 90% yield. The reaction of (6 S)- and (6 R)-4-bromo-6-hydroxy-6-(2,3,5-tri- O-benzoyl-β- d-ribofuranosyl)-6 H-py...
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Published in: | Carbohydrate research 1999-05, Vol.318 (1), p.180-185 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The synthesis of 5-hydroxy-2-(β-
d-ribofuranosyl)pyran-4-one (
9) is described. Treatment of pyranulose glycoside with bromine in carbon tetrachloride afforded brompyranulose glycoside in 90% yield. The reaction of (6
S)- and (6
R)-4-bromo-6-hydroxy-6-(2,3,5-tri-
O-benzoyl-β-
d-ribofuranosyl)-6
H-pyran-3-one (
2) in acidic media was examined with the following results: the reaction of
2 with trifluoroacetic acid (TFA) in dioxane afforded a mixture of 5-hydroxy-2-(2,3,5-tri-
O-benzoyl-β-
d-ribofuranosyl)pyran-4-one (
3) and its furan derivative 5-hydroxy-2-{5-(benzoyloxy)methyl]furan-2-yl}pyran-4-one (
4), but the use of hydrochloric acid formed the bromofurfural, 3-bromo-5-(2,3,5-tri-
O-benzoyl-β-
d-ribofuranosyl)-2-furancarboxyaldehyde only. Acetylation of a mixture (
3 and
4) with acetic anhydride facilitated product separation to give the corresponding acetates 5-acetoxy-2-(2,3,5-tri-
O-benzoyl-β-
d-ribofuranosyl)pyran-4-one (
5) and 5-acetoxy-2-{5-[(benzoyloxy)methyl]furan-2-yl}pyran-4-one (
6). Treatment of
5 with hydrazine afforded 3-hydroxymethyl-6-(β-
d-ribofuranosyl)-1
H-pyridazin-4-one in 43% yield. Debenzoylation of
5 with aq ammonia gave
9 in 50% yield. |
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ISSN: | 0008-6215 1873-426X |
DOI: | 10.1016/S0008-6215(99)00098-1 |