O-Alkylation at the anomeric centre for the stereoselective synthesis of Kdo-α-glycosides
作者:Angelika Esswein、Hansjörg Rembold、Richard R. Schmidt
DOI:10.1016/0008-6215(90)84198-4
日期:1990.4
diastereoselectively to the α-glycosides. In this way, lipopolysaccharide building-blocks containing α-Kdo-(2→6)-GlcN and α-Kdo-(2→6)-β-GlcN-(1→6)-GlcN moieties were obtained and deployed in the synthesis of decyl 4,5,7,8-tetra-O-acetyl-3-deoxy-N-methyl-α- d -manno-2- octulopyranosidonamide (18), 2,3-di-O-tetradecanoyl- d -glycer-1-yl 4,5,7,8-tetra-O-acetyl-3-deoxy-N-methyl-α- d -manno-2- octulopyranosid-onamide
摘要4,5:7,8-二-O-环己叉基-3-脱氧-N-甲基-α-d-甘露聚糖-八吡喃磺酰胺(1)二价阴离子的异头中心的O-烷基化导致非对映选择性α-糖苷。以这种方式,获得了包含α-Kdo-(2→6)-GlcN和α-Kdo-(2→6)-β-GlcN-(1→6)-GlcN部分的脂多糖结构单元,并将其用于合成中4,5,7,8-四-O-乙酰基-3-脱氧-N-甲基-α-d-甘露糖-2-辛基吡喃西多酰胺(18),2,3-二-O-十四烷酰基-d-甘油的合成-1-基4,5,7,8-四-O-乙酰基-3-脱氧-N-甲基-α-d-甘露聚糖-2-八吡喃糖苷-酰胺(22),甲基2,3,4-三- O-乙酰基-6-O-(甲基4,5,7,8-四-O-乙酰基-3-脱氧-α-d-甘露糖-2-辛吡喃糖醛酸酯)-α-d-吡喃葡萄糖苷(28),1- O-乙酰基-2-脱氧-6-O-(甲基4,5,7,