Protected glycosides and disaccharides of 2-amino-2-deoxy-d-glucopyranose by ferric chloride-catalyzed coupling
作者:Makoto Kiso、Laurens Anderson
DOI:10.1016/0008-6215(85)85205-8
日期:1985.2
N-chloroacetyl, and N-phthaloyl congeners of 3. The latter compounds, except for the N-phthaloyl derivative, gave oxazolines in the absence of an alcoholic reactant. Compound 3 and the related N-benzoyl, N-chloroacetyl, N-acetyl-3,4,6-tri-O-benzyl, and N-acetyl-4-O-acetyl-3,6-di-O-benzyl derivatives were coupled to one or more protected sugars to form protected, beta-linked disaccharides. Coupling
描述了受保护的2-酰基氨基-2-脱氧-β-D-吡喃葡萄糖1-乙酸盐的氯化铁催化的羟基化合物的糖基化。除了醇与2-乙酰氨基-1,3,4,6-四-O-乙酰基-2-脱氧-β-D-吡喃葡萄糖(3),烯丙基(和其他烷基)β-糖苷是从3的N-苯甲酰基,N-苯氧基乙酰基,N-甲氧基乙酰基,N-氯乙酰基和N-邻苯二甲酰基同系物获得的。除了N-邻苯二甲酰基衍生物以外,后一种化合物在不存在醇类反应物的情况下生成恶唑啉。化合物3和相关的N-苯甲酰基,N-氯乙酰基,N-乙酰基-3,4,6-三-O-苄基和N-乙酰基-4-O-乙酰基-3,6-二-O-苄基衍生物将其与一种或多种受保护的糖偶联以形成受保护的,β-连接的二糖。受体6位的偶联反应顺利进行,收率为67-80%。为了在位置3和4上成功偶联,需要较长的反应时间和多次添加糖基供体,收率范围从60%到低至30%。1,3,4,6-四-O-乙酰基-2-(氯乙酰胺基)-2-