Glycosyl hydroperoxides derived from 2-deoxysugars
摘要:
Oxidation of 3,4,6-tri-O-benzyl-2-deoxy-D-glucose and D-galactose or their t-butyl glycosides to the corresponding glycosyl hydroperoxides can be performed with hydrogen peroxide in the presence of an acid catalyst. Several reaction conditions and their influence on the effectiveness of the oxidation are discussed. Separation of the alpha - and beta-anomers of the glycosyl hydroperoxides was achieved through mixed peroxide formation by reaction of the hydroperoxide group with 2-methoxypropene and subsequent deprotection. (C) 2010 Elsevier Ltd. All rights reserved.
New stable anomeric hydroperoxides derived from 2-deoxysugars; enantioselective epoxidation of 2-methyl-1,4-naphthoquinone
作者:Wioletta Kośnik、Andrew V. Stachulski、Marek Chmielewski
DOI:10.1016/j.tetasy.2005.04.009
日期:2005.6
3.5-Di- or 3,4,6-tri-O-substituted-2-deoxysugars or their glycosides can be oxidized with hydrogen peroxide in the presence of an acid catalyst to the corresponding anomeric hydroperoxides, which are relatively stable, can be separated into pure anomers by column chromatography and stored in a refrigerator without visible decomposition. The hydroperoxides thus obtained were used for the enantioselective epoxidation of 2-methyl-1,4-naphthoquinone with ees in the range 28-47%. (c) 2005 Elsevier Ltd. All rights reserved.