Synthesis and N.M.R. spectra of methyl 2-deoxy-2-fluoro- and 3-deoxy-3-fluoro-α- and β-d-glucopyranosides
作者:Pavol Kováč、Herman J.C. Yeh、Cornelis P.J. Glaudemans
DOI:10.1016/0008-6215(87)80239-2
日期:1987.11
silver perchlorate-catalyzed glycosylation showed remarkable lack of stereoselectivity for the formation of the corresponding methyl alpha-glycoside, despite the presence at C-2 of the fluorine functionality presumably not capable of neighboring-group participation. Pure methyl 2-deoxy-2-fluoro-alpha- and beta-D-glucopyranosides were obtained by fractional crystallization from the mixture formed by methanolysis
甲基3-脱氧-3-氟-α-和β-D-吡喃葡萄糖苷以及α-和β-D-葡糖呋喃糖苷是通过3-脱氧-3-氟-1,2:5,6-di-O的甲醇分解制得的-异亚丙基-α-D-葡萄糖呋喃糖。结晶3,4,6-三-O-乙酰基-2-脱氧-2-氟-α-D-吡喃葡萄糖基氯(2)和相应的糖基溴化物(3)由1,3,4,6-四甲基制得-O-乙酰基-2-脱氧-2-氟-β-D-吡喃葡萄糖(1)。在三氟甲磺酸银和高氯酸银催化的糖基化条件下,2与甲醇的反应表明,尽管在C-2处存在氟官能团可能无法分离,但对于形成相应的甲基α-糖苷而言,明显缺乏立体选择性。邻居参与。