title: Nitrosation of sugar oximes: preparation of 2-glycosyl-1-hydroxydiazene-2-oxides.
abstract: Oximes of glucose, xylose, lactose, fructose, and mannose have been prepared. Nitrosation of the oximes of glucose, xylose, and lactose with NaNO2/HCl afforded 2-(beta-glycopyranosyl)-1-hydroxydiazene-2-oxides, which were isolated as salts 13, 22, and 28. Nitrosation of fructose oxime 29 furnished fructose, whereas nitrosation of mannose oxime 30 with NaNO2/HCl afforded the 1-hydroxy-2-(beta-D-mannopyranosyl)diazene-2-oxide 32, from which the p-anisidinium salt 31 and the sodium salt 33 were prepared. However, nitrosation of 30 with isopentyl nitrite in aqueous solutions of CsOH or KOH resulted in the formation of the 2-(alpha-D-mannofuranosyl)-1-hydroxydiazene-2-oxide salts 34 and 35, respectively. Methylation of the ammonium 2-(beta-D-glucopyranosyl)-1-hydroxydiazene-2-oxide 13 yielded the 1-methoxy compound, which was benzoylated to afford the tetra-O-benzoate 14a, the structure of which was confirmed by X-ray diffraction analysis. From the glucose O-methyloximes 15 and 16 the N-methoxy-N-nitroso-2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosylamine 18 was prepared. The structure of this compound was confirmed by X-ray diffraction analysis. Treatment of acetobromoglucose with cupferron furnished the 1-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyloxy)-2-phenyldiazene-2-oxide 20.
authors.affiliation: Fachbereich Chemie der Universität Konstanz, Fach M 733, Universitätsstrasse 10, 78457 Konstanz, Germany.
authors.forename: Jörg
authors.initials: J
authors.lastname: Brand
authors.forename: Thomas
authors.initials: T
authors.lastname: Huhn
authors.forename: Ulrich
authors.initials: U
authors.lastname: Groth
authors.forename: Johannes C
authors.initials: JC
authors.lastname: Jochims
mesh_terms: D002241:Carbohydrates / Q000737:chemistry*; D007094:Imides / Q000138:chemical synthesis*; D009566:Nitrates / Q000737:chemistry*; D015538:Nitrosation; D010091:Oximes / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D007094:Imides; D009566:Nitrates; D010091:Oximes