A Facile H<sub>2</sub>SO<sub>4</sub>-SiO<sub>2</sub>–Catalyzed Ferrier Rearrangement of 3,4,6-Tri-<i>O</i>-benzyl-d-glucal
作者:Jianbo Zhang、Bo Zhang、Jiafen Zhou、Heshan Chen、Juan Li、Guofang Yang、Zhongfu Wang、Jie Tang
DOI:10.1080/07328303.2013.809093
日期:2013.7.24
convenient promoter for Ferrier-type rearrangement of 3,4,6-tri-O-benzyl-d-glucal in CH2Cl2, which is a difficult donor for this type of reaction. The acceptors include primary alcohols, secondary alcohols, pentanol, halogenated alcohol, sterols, thiol, and 2-naphthol. Thus, 2,3-unsaturated glycosides were obtained rapidly (<2 h) and efficiently (>62%) in good α-selectivity (α/β>4.2:1) under mild conditions
固定在硅胶上的硫酸(H 2 SO 4 -SiO 2)被用作CH 2 Cl 2中3,4,6-三-O-苄基-d-葡糖的费勒型重排的高效便捷的促进剂,对于这种类型的反应,这是一个困难的供体。受体包括伯醇,仲醇,戊醇,卤代醇,固醇,硫醇和2-萘酚。因此,在温和条件下以良好的α-选择性(α/β> 4.2:1)快速(<2 h)和有效(> 62%)获得了2,3-不饱和糖苷。