5-Aminosalicylic Acid → Glucopyranosylamine

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반응 단계

Beta-D-glucosylamine is prepared by the reaction of D-(+)-glucose with ammonium bicarbonate as described by Likhosherstov, L. M. et al. (Carbohydr. Res. 146: C1, 1986). A reaction mixture containing the glycosylamine and a 1- to 2-fold excess by weight of 5-aminosalicylic acid is allowed to react overnight in pyridine at 50° C. The reaction is monitored by thin-layer chromatography (TLC) (silica gel; eluent: CHCl3:MeOH, 1:1, by volume). The solvent is removed, and the reaction mixture is purified by chromatography on silica gel or BIOGEL-F2™ (BioRad, Richmond, Calif.), using absorbance at 254 nm as detection. The products are characterized by TLC on silica gel, electrospray mass spectrometry, and 1H- and 13C-NMR analysis. The transamination reaction is indicated by a downfield shift of resonance of the anomeric proton (observed at δ=4.1 ppm by analysis of the unsubstituted glycosyl-1-amine) to δ=4.3–4.7 ppm in the 1H-NMR spectrum of the β-anomer of the synthetic glycoconjugate product. (This anomer is the major product of the transamination reaction.)

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