Synthesis of a selectively protected trisaccharide building block that is part of xylose-containing carbohydrate chains from N-glycoproteins
作者:János Kerékgyártó、Jos G.M. van der Ven、Johannis P. Kamerling、András Lipták、Johannes F.G. Vliegenthart
DOI:10.1016/0008-6215(93)87009-h
日期:1993.1
The synthesis is reported of ethyl 4-O-[3-O-allyl-4,6-O-isopropylidene-2-O-(2,3,4-tri-O-acetyl-beta-D- xylopyranosyl)-beta-D-mannopyranosyl]-3,6-di-O-benzyl-2-deoxy-2-phthalim ido-1 - thio-beta-D-glucopyranoside (16), a key intermediate in the synthesis of xylose-containing carbohydrate chains from N-glycoproteins. Condensation of ethyl 3,6-di-O-benzyl-2-deoxy-2-phthalimido-1-thio-beta-D- glucopyranoside
据报道合成了乙基4-O- [3-O-烯丙基-4,6-O-异亚丙基-2-O-(2,3,4-三-O-乙酰基-β-D-吡喃吡喃糖基)-β -D-甘露吡喃糖基] -3,6-二-O-苄基-2-脱氧-2-邻苯二甲酰亚胺基-1--硫代β-D-吡喃葡萄糖苷(16),是合成含木糖的碳水化合物链的关键中间体来自N-糖蛋白。乙基3,6-二-O-苄基-2-脱氧-2-邻苯二甲酰亚胺基-1-硫代-β-D-吡喃葡萄糖苷(5)与2,4,6-三-O-乙酰基-3-O-的缩合使用三氟甲磺酸银作为促进剂的烯丙基-α-D-吡喃葡萄糖基溴化物,得到β-连接的二糖衍生物8(84%)。8的O-脱乙酰基化,然后进行异亚丙基化,得到10,将其通过氧化还原转化为乙基4-O-(3-O-烯丙基-4,6-O-异亚丙基-β-D-甘露吡喃糖基)-3,6-二-O-苯甲酰基-2-脱氧-2-邻苯二甲酰亚胺-1-硫代-β-D-吡喃葡萄糖苷(12)。由三氟甲磺酸银促进的12与2