2-Methyl-(3,4,6-tri-O-acetyl-1,2-dideoxy-α-D-glucopyrano)[2,1-d]-2-oxazoline (5) was reacted with glycosyl acceptors bearing primary (6, 8, 10, 20) or secondary hydroxy groups (12, 14, 16, 18) in the presence of anhydrous cupric bromide or cupric chloride at elevated temperature to provide 2-acetamido-2-deoxy-β-D-glucopyranosides in 36−92% yield. The reaction conditions are milder than those previously
使2-甲基-(3,4,6-三-O-乙酰基-1,2-二脱氧-α-D-
吡喃
吡喃)[2,1 - d ] -2-
恶唑啉(5)与带有伯基的糖基受体反应(6,8,10,20)或仲羟基基团(12,14,16,18)在无
水溴化铜或
氯化
铜的存在下,在升高的温度,以提供2-乙酰
氨基-2-脱氧-3-β-
D-吡喃葡萄糖ef=https://www.molaid.com/MS_187149 target="_blank">吡喃
葡萄糖苷收率为36-92%。该反应条件比以前描述的使用p进行
恶唑啉活化的条件温和-甲
苯磺酸或
氯化
铁。用三甲基
硅烷基
叠氮化物(22)和CuCl 2处理
恶唑啉可产生2-乙酰
氨基-3,4,6-三-O-乙酰基-2-脱氧-β-
D-吡喃葡萄糖基
叠氮化物(23),产率为69%。(©Wiley-
VCH Verlag GmbH,69451 Weinheim,Germany,2002)