Sequential synthesis and 13C-N.m.r. spectra of methyl β-glycosides of (1→4)-β-d-xylo-oligosaccharides
作者:Pavol Kováč、Ján Hirsch
DOI:10.1016/s0008-6215(00)81034-4
日期:——
) with methyl 2,3-di- O -acetyl-β- d -xylopyranoside gave methyl O -(2,3-di- O -acetyl-4- O -benzyl-β- d -xylopyranosyl)-(1→4)-2,3-di- O -acetyl-β- d -xylopyranoside ( 22 ). Catalytic hydrogenolysis of 22 exposed HO-4′ which was then condensed with 2 . This sequence of reactions was repeated three more times to afford, after complete removal of protecting groups, a homologous series of methyl β-glycosides
摘要2,3-二-O-乙酰基-4-O-苄基-α,β-d-吡喃吡喃糖基溴化物(2)与甲基2,3-二-O-乙酰基-β-d-吡喃吡喃糖苷反应生成甲基O-(2,3-二-O-乙酰基-4-O-苄基-β-d-吡喃吡喃糖基)-(1→4)-2,3-二-O-乙酰基-β-d-吡喃吡喃糖苷(22) 。22个暴露的HO-4'的催化氢解反应,然后与2进行缩合。将该反应顺序再重复三遍,以在完全除去保护基团后得到(1→4)-β-d-木糖寡糖的甲基β-糖苷的同源系列。给出了合成的甲基β-糖苷(二糖至六糖)的13 CN.mr光谱,以及其他六种不同取代的同源系列(1→4)-d-木糖寡糖的数据。