Lewissäure-katalysierte synthesen von di- und trisaccharid-sequenzen der O- und N-glycoproteine. Anwendung von trimethylsilyltrifluoromethanesulfonat
作者:Hans Paulsen、Michael Paal
DOI:10.1016/0008-6215(84)85005-3
日期:1984.12
Abstract In the presence of trimethylsilyltrifluoromethanesulfonate as Lewis acid catalyst, β-acetates reacted, as glycosyl donors and with neighboring-group participation, with secondary hydroxyl groups of saccharides having low reactivity to give β-glycosidically linked di- and oligo-saccharides in high yields. The protecting groups of both compounds of the reaction had to be stable under acid conditions
摘要在三甲基甲硅烷基三氟甲磺酸酯作为路易斯酸催化剂的存在下,β-乙酸酯作为糖基供体并与邻近基团反应,与低反应性的糖的仲羟基反应,从而以高收率得到β-糖苷键合的二糖和寡糖。该反应的两种化合物的保护基必须在酸性条件下是稳定的。因此,1,2,3,4,6-戊基-O-乙酰基-β-d-吡喃半乳糖与甲基2-叠氮基-4,6-二-O-苯甲酰基-2-脱氧-β-d-的反应半乳糖吡喃糖苷以83%的收率得到甲基2-叠氮基-2,6-二-O-苯甲酰基-2-脱氧-3-O-(2,3,4,6-四-O-乙酰基-β-d- (吡喃半乳糖)-β-d-吡喃半乳糖苷是有用的构建单元。比较了路易斯酸催化和Koenigs-Knorr条件下的糖苷反应。