hydroxy α-amino acids in the presence of 5 mol% dysprosium triflate immobilized in 1-butyl-3-methylimidazolium hexafluorophosphate under mild reaction conditions to afford the corresponding 2,3-unsaturated glycopyranosides in excellent yields with high α-selectivity. The catalyst immobilized in ionic liquids was recycled in subsequent reactions without any apparent loss of activity.
                                    D-
乙二醇与多种酒类, 
酚类 和羟基
α-氨基酸在5 mol%的存在下 f酸f 固定在 1-丁基-3-甲基
咪唑鎓
六氟磷酸盐在温和的反应条件下,以高产率和高α-选择性得到相应的2,3-不饱和糖
吡喃糖苷。这催化剂 固定在 
离子液体 在随后的反应中将其再循环,没有任何明显的活性损失。