New Synthetic Methods and Reagents for Complex Carbohydrates. VIII. Stereoselective<i>α</i>- and<i>β</i>-Mannopyranoside Formation from Glycosyl Dimethylphosphinothioates with the C-2 Axial Benzyloxyl Group
作者:Takashi Yamanoi、Kazumi Nakamura、Hiroshi Takeyama、Kenji Yanagihara、Toshiyuki Inazu
DOI:10.1246/bcsj.67.1359
日期:1994.5
The reactions of mannopyranosyl dimethylphosphinothioates and alcohols using silver perchlorate as an activator in the presence of molecular sieves 4A in benzene at room temperature gave the 1,2-trans-α-mannopyranosides in good yields. On the other hand, 1,2-cis-β-mannopyranosides could be obtained from the dimethylphosphinothioates by the combined use of iodine and 5 mol% triphenylmethyl perchlorate
吡喃甘露糖基二甲基硫代膦酸酯和醇使用高氯酸银作为活化剂,在分子筛 4A 存在下,在室温下在苯中反应,以良好的收率得到 1,2-反式-α-吡喃甘露糖苷。另一方面,通过结合使用碘和 5 mol% 高氯酸三苯甲酯作为活化系统,可以从二甲基硫代膦酸酯中获得 1,2-顺式-β-吡喃甘露糖苷。描述了通过这些方法合成糖蛋白的 αMan(1→6)[αMan(1→3)]Man 和 βMan(1→4)GlcNAc 单元的衍生物。