Synthesis of the Branched Trisaccharide<scp>L</scp>‐<i>Glycero</i>‐α‐<scp>D</scp>‐<i>manno</i>‐heptopyranosyl‐(1 → 3)‐ [β‐<scp>D</scp>‐glucopyranosyl‐(1 → 4)]‐<scp>L</scp>‐<i>glycero</i>‐α‐<scp>D</scp>‐<i>manno</i>‐heptopyranose, Protected to Allow Flexible Access to<i>Neisseria</i>and<i>Haemophilus</i>LPS Inner Core Structures
作者:Eva Segerstedt、Karin Mannerstedt、Mikael Johansson、Stefan Oscarson
DOI:10.1081/car-200044580
日期:2004.1
reactions using a benzyloxymethyl chloride or a commercial vinyl reagent. The anhydro bridge was formed by treatment of a 6‐OH methyl α‐heptoside precursor with FeCl3. The protecting group pattern allows modifications at the 2‐, 3‐, 4‐, and 6‐positions of the second heptose moiety and also, after acetolysis of the anhydro bridge, elongation at the reducing end, all known alterations found in the bacterial
摘要有效合成受保护的支链三糖(2'S,3'S)-(7-O-苄基-6-O-氯乙酰基-3,4-O-(2',3'-二甲氧基丁烷-2', 3′-二基)-2-氧-对甲氧基苄基-L-甘油-α-D-甘露聚糖-七吡喃糖基)-(1→3)-[(2,3,4,6-四-O-苯甲酰基-β -D-吡喃葡萄糖基)((1→4)]-7-O-乙酰基-1,6-脱水-2-O-苄基-L-甘油-β-D-甘露聚糖描述了嗜血杆菌和奈瑟氏球菌LPSs的核心结构的合成。使用苄氧甲基氯或市售的乙烯基试剂通过格氏反应形成庚糖。脱水桥是通过用FeCl3处理6-OH甲基α-庚糖苷前体而形成的。保护基模式允许在第二个庚糖部分的2位,3位,4位和6位进行修饰,并且在无水桥乙酰化后,还可以在还原端进行延伸,