Synthesis of regioselectively sulfated xylodextrins and crystal structure of sodium methyl β-d-xylopyranoside 4-O-sulfate hemihydrate
作者:Beatriz Abad-Romero、Kurt Mereiter、Herbert Sixta、Andreas Hofinger、Paul Kosma
DOI:10.1016/j.carres.2008.09.018
日期:2009.1
methanol followed by Zemplen deacetylation. Methyl beta-D-xylopyranoside, methyl beta-D-xylobioside and methyl beta-D-xylotrioside were subjected to treatment with dibutyltin oxide followed by reaction with the trimethylamine/sulfur trioxide complex in tetrahydrofuran. This way, preferential sulfation of the terminal 4-hydroxy group at the nonreducing xylopyranosyl unit was achieved. In addition, partial sulfation
由过乙酰化的端基木糖基三氯乙亚氨酸酯与甲醇反应,然后经Zmplen脱乙酰化,制备甲基木糖苷和甲基木糖苷。将甲基β-D-木吡喃糖苷,甲基β-D-木糖苷和甲基β-D-木糖苷用二丁基氧化锡处理,然后在三氢呋喃中与三甲胺/三氧化硫复合物反应。这样,实现了非还原性吡喃吡喃糖基单元的末端4-羟基的优先硫酸化。另外,在远端木糖单元的位置2处观察到部分硫酸化。取代模式源自NMR光谱数据,并且通过甲基β-D-吡喃吡喃糖苷4-O-硫酸钠的X射线结构测定来证实。该化合物在空间群P1的三斜晶格中结晶为半水合物,并具有拟单斜2D超分子结构。游离戊糖低聚物经由它们的中间亚锡缩醛的硫酸化可以因此被开发以产生用于生物医学应用的具有生物活性的寡糖。