Electroorganic Synthesis 66: Selective Anodic Oxidation of Carbohydrates Mediated by TEMPO
作者:Karsten Schnatbaum、Hans J. Schäfer
DOI:10.1055/s-1999-3464
日期:1999.5
The carbohydrates 4-15 are anodically oxidized with 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) as mediator. Selective and complete reaction at the primary hydroxyl groups affords the corresponding carboxylic acid 16-32 in moderate to excellent yield. Methyl α-d-glucopyranoside is converted in 98% yield to the uronic acid 16. Cyclic voltammetry shows that the oxydation is base-catalyzed and the oxidation of the hydroxy group with TEMPO+ (2) is rate determining.
disaccharide and also some of its derivatives have been shown to have a number of interesting properties that indicate their importance in the treatment of certain human diseases. Differentiating the two glucosyl moieties in the trehalose molecule has often been a synthetic challenge. We report here an easy way to obtain the monoaldehyde of trehalose, as well as the relevant symmetrical dialdehyde. The reactivity
(α-d-glucopyranosyluronic acid) (α-d-glucopyranosiduronic acid) and simple derivatives
作者:Mayer B. Goren、Kuo-Shii Jiang
DOI:10.1016/s0008-6215(00)83834-3
日期:1980.3
Abstract For preparing pseudo cord-factors, similar in gross structure to α,α-trehalose6,6'-dimycolate, we have synthesized (α- d -glucopyranosyluronic acid) (α- d -glucopyranosiduronic acid) (“trehalose dicarboxylic acid”) by catalytic oxidation of trehalose. Such simple derivatives as the dimethyl ester and the hexa- O -acetyl diacid chloride are useful for the attachment of lipid substituents to