Studies toward a conjugate vaccine for anthrax. Synthesis and characterization of anthrose [4,6-dideoxy-4-(3-hydroxy-3-methylbutanamido)-2-O-methyl-d-glucopyranose] and its methyl glycosides
作者:Rina Saksena、Roberto Adamo、Pavol Kováč
DOI:10.1016/j.carres.2005.04.010
日期:2005.7
group and reduce the azido function. Subsequent N-acylation of the formed amine 5 with 3-hydroxy-3-methylbutyric acid gave the target methyl alpha-glycoside 6. Synthesis of methyl beta-anthroside (22) comprised the same sequence of reactions, starting from the known methyl 4-azido-3-O-benzyl-4,6-dideoxy-beta-D-mannopyranoside (17), which was prepared from 1. In the synthesis of anthrose (16), 1-thio-beta-glucoside
炭疽病(16)及其甲基α-(6)和β-糖苷(22)的第一化学合成中的关键步骤是分别从三氟甲磺酸10、2和18中的C-2颠倒C-2的构型。常见的中间体,甲基4-叠氮基-3-O-苄基-4,6-二脱氧-α-D-甘露吡喃糖苷(1)。为了制备甲基α-蒽苷(6),将从2中获得的葡萄糖产物3在O-2处甲基化,然后对所形成的2-甲基醚4进行氢化/氢解,以同时除去保护性苄基并还原叠氮功能。随后将形成的胺5用3-羟基-3-甲基丁酸进行N-酰化,得到目标甲基α-糖苷6。甲基β-蒽苷(22)的合成从已知的甲基4-开始,包括相同的反应顺序。叠氮基-3-O-苄基-4,6-二脱氧-β-D-甘露吡喃糖苷(17),