We have succeeded in developing a novel glycosidation catalyzed by a combination of trimethylsilyl bromide (TMSBr) and a Lewis acid using simple O-glycosides as glycosyl donors. Treatment of benzyl 2-deozy-2-tri-chloroethoxycarbonylamino-D-glucopyranoside with TMSBr and zinc bromide in the presence of glycosyl acceptors gave α-O-glycosides in moderate to high yields. Zinc triflate and tin(II)triflate were also found to be effective as the Lewis acid. This new methodology is applicable to methyl D-glucopyranoside.
我们成功开发了一种新型的糖苷化反应,该反应是由三甲基
氯化铵(TMSBr)和
路易斯酸的组合催化,使用简单的O-糖苷作为糖苷供体。将苄基2-脱氧-2-三
氯乙氧羧酰胺-
D-葡萄糖吡喃糖苷与TMSBr和
溴化锌在糖苷受体存在下处理,获得了中到高产率的α-O-糖苷。此外,
三氟甲苯酸
锌和亚
锡三氟甲苯酸也被发现作为
路易斯酸有效。该新方法适用于甲基
D-葡萄糖吡喃糖苷。