aldehydo-D-Xylose → HCID 178478778, Verbindung

Beteiligte Stoffe

Reaktionsschritte

D-(+)-xylose (0.35 g, 2.6 mmol) was added to a solution of hydrochloride 4 (0.3 g, 0.65 mmol) in methanol (20 mL) and the mixture was stirred for 20 min at room temperature. Then the solution was cooled to −78° C. and sodium cyanoborohydride (0.17 g, 2.6 mmol) was added. The reaction mixture was stirred at −78° C. for 2 h and at room temperature for 4 d. After this time, the solvent was removed under reduced pressure and the residue was washed with water. The formed yellow solid was isolated and dried under vacuum. Then the residue was re-dissolved in 5% HCl and the solvent was removed at reduced pressure. The obtained compound was dissolved in water containing 0.1% TFA and purified by preparative HPLC (C 18 Luna column from Phenomenex 250×21.2 mm, 5μ, isocratic method, water/acetonitrile=80%:20%). The fractions containing the target compound were combined and the solvent was removed under reduced pressure. The residue was dissolved in 5% HCl and solvent was removed under reduced pressure (twice). The resulting yellow powder was dissolved in water and the solution was lyophylized to give 34 mg (7%) of compound 23 as a yellow solid. 1H NMR (300 MHz, CD3OD) δ 1.64 (br s., 4H), 2.62 (m, 2H), 3.30 (m, 4H), 3.35-3.70 (m, 13H), 4.23 (m, 2H), 4.47 (m, 2H), 6.95 (d, 2H), 7.15 (d, 2H). m/z (APCI)=689 [C28H45ClN8O10+H]+. [α]D25=−16.1° (c=0.5, MeOH).

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