2,3-Anhydrosugars in glycoside bond synthesis. Application to the preparation of C-2 functionalized α-d-arabinofuranosides
作者:Oana M Cociorva、Todd L Lowary
DOI:10.1016/j.tet.2003.12.022
日期:2004.2
novel two-step route has been developed for the synthesis of a panel of oligosaccharides (9–17) containing C-2 functionalized α-d-arabinofuranosyl residues. The first step in this route consists of a highly stereocontrolled glycosylation reaction using a 2,3-anhydrosugar thioglycoside (6). In the second step, the epoxide ring in the 2,3-anhydrosugar glycoside is regioselectively opened at C-2 with sodium
一种新颖的两步路线已被开发用于寡糖的面板的合成(9 - 17)含C-2官能α-d阿拉伯呋喃糖残基。此路线的第一步是使用2,3-脱水糖硫糖苷(6)。在第二步中,用甲醇钠和叠氮化钠在C-2上将2,3-脱水糖苷中的环氧化物区域选择性地打开,从而提供具有α-d-阿拉伯呋喃糖基立体化学的产物。对这些靶标的这种方法避免了在具有在C-2处具有非参与基团的阿拉伯呋喃糖基供体的糖基化中固有的潜在的立体控制问题。该路线的收敛性也很高,可在环氧糖苷27 – 29与亲核试剂反应后制备一系列C-2'和C-2''修饰的寡糖。