Synthesis and n.m.r. analysis of branched trisaccharide and pentasaccharide haptens of the β-hemolytic streptococci group A and the preparation of synthetic antigens
作者:B. Mario Pinto、Kerry B. Reimer、Arlette Tixidre
DOI:10.1016/0008-6215(91)80123-5
日期:1991.3
groups afforded the trisaccharide haptens as their 1-propyl and 8-(methoxycarbonyl)octyl glycosides and the pentasaccharide as its 8-(methoxycarbonyl)octyl glycoside. The compounds have been subjected to detailed analysis by two-dimensional n.m.r. methods. Preparation of the synthetic antigens followed coupling of the 8-(methoxycarbonyl)octyl glycosides to bovine serum albumin via the acyl azide intermediates
描述了β-溶血链球菌A组的细胞壁多糖的支链三糖和五糖部分的合成。关键的二糖受体,烯丙基或8-(甲氧羰基)卵母细胞3-O-(3,4,6-三-O-苄基-2-脱氧-2-邻苯二甲酰亚胺-β-D-吡喃葡萄糖基)-4-O-苄基-在Koenigs-Knorr条件下,将α-L-鼠李糖吡喃糖苷与选择性封闭的α-L-鼠李糖吡喃糖酰氯结合,分别以81%和62%的产率提供支链三糖。类似地,用受保护的β-D-GlcpNAc-(1 ---- 3)-alpha-L-Rhap-(1 ---- 3)-alpha-L-Rhap进行8-(甲氧羰基)辛基二糖的糖基化氯化物得到五糖,产率为43%。关键的二糖受体依次从烯丙基或8-(甲氧羰基)辛基鼠李糖苷受体和3,4,在Koenigs-Knorr条件下,6-三-O-苄基-2-脱氧-2-邻苯二甲酰亚胺基-β-D-吡喃葡萄糖基氯。后面的糖基供体先前没有描述。除去保护基得到三糖半抗原作为其