Synthesis of methyl 6″-deoxy-6′-fluoro-α-isomaltoside and of the corresponding trisaccharide
作者:Pavol Kováč、Vladimír Sklenář、Cornelis P.J. Glaudemans
DOI:10.1016/0008-6215(88)84143-0
日期:1988.5
6-trimethylpyridine. O-Deacetylation of 5 , followed by treatment of the formed 6 , containing only HO-6′ unsubstituted, with diethylaminosulfur trifluoride (DAST) or dimethylaminosulfur trifluoride (methyl DAST) gave the per- O -benzyl derivative ( 9 ) of methyl 6′-deoxy-6′-fluoro-α-isomaltoside. Compound 9 was also obtained by condensation of 1 with 2,3,4-tri- O -benzyl-6-deoxy-6-fluoro-β- d -glucopyranosyl fluoride
摘要甲基6-O-(6-O-乙酰基-2,3,4-三-O-苄基-α-d-吡喃葡萄糖基)-2,3,4-三-O-苄基-α-d-吡喃葡萄糖苷(当2,3,4-三-O-苄基-α-d-吡喃葡萄糖基(1)与6-O-乙酰基-2,3,4-三-O-苄基缩合时,形成具有高立体选择性的5)在2,4,6-三甲基吡啶存在下,用高氯酸银促进乙醚中的-α-d-吡喃葡萄糖基氯。5的O-脱乙酰化,然后用二乙基氨基三氟化硫(DAST)或二甲基氨基三氟化硫(甲基DAST)处理仅含未取代的HO-6'的生成的6,得到甲基6'的全-O-苄基衍生物(9) -脱氧-6'-氟-α-异麦芽糖苷。还可以通过1与2,3的缩合反应获得化合物9,在高氯酸银和无水氯化亚锡存在下的4-三-O-苄基-6-脱氧-6-氟-β-d-吡喃葡萄糖基氟(4)。通过将6与4缩合获得6-脱氧-6-氟-异麦芽三糖的完全苄基化的甲基α-糖苷(15)。9和15 gae的氢解异麦芽糖