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.