Studies on sialic acids. XI. Synthesis of 2-O-glycosyl derivatives of N-acetylneuraminic acid.
作者:SHINGO SATO、KIMIO FURUHATA、MASAYOSHI ITOH、YOSHIYASU SHITORI、HARUO OGURA
DOI:10.1248/cpb.36.914
日期:——
The reactions of methyl N-acetyl-4, 7, 8, 9-tetra-O-acetyl-2-chloro-2-deoxy-β-D-neuraminate (2) with 2', 3'-di-O-acetylinosine (1) and with 2', 3'-di-O-acetyl-N-benzoylcytidine (8) under Koenigs-KOnorr-like reaction conditions geve the corresponding (2→5) linked disaccharide uncleoside analogues, in yields of 31% and 23% respectively. These nucleoside 5'-N-acetylneuraminic acid analogues were converted via saponification or ammonolysis into the final target compounds. The stereochemistry of these. compounds was confirmed by analysis. of the proton nuclear magnetic resonance (1H-NMR) spectra and measurement of the rate of hydrolysis of the (2→5) glycosidic linkage.
甲基N-乙酰基-4,7,8,9-四-O-乙酰基-2-氯-2-脱氧-β-D-神经氨酸(2)与2',3'-二-O-乙酰基肌苷(1)和2',3'-二-O-乙酰基-N-苯甲酰胞苷(8)在Koenigs-KOnorr类反应条件下的反应分别得到相应的(2→5)连接二糖核苷酸类似物,产率分别为31%和23%。这些核苷酸5'-N-乙酰神经氨酸类似物通过皂化或氨解转化为最终目标化合物。通过分析质子核磁共振(1H-NMR)光谱和测量(2→5)糖苷键的水解速率,证实了这些化合物的立体化学。