A carbonyl-selective fluorescence label 5 for the detection of oxidized groups has been synthesized by an expeditious three-step sequence. The fluorophore carbazole and the reactive aminoxy group, which binds to carbonyls as an oxime, were tethered by a diethylene glycol spacer. The label allows detection of minute amounts of oxidized functionalities in oligosaccharides and cellulosics under the relatively harsh conditions of GPC separation, without fluorescence interference with light scattering (MALLS) detection. Synthetic keto sugars have been used to optimize the derivatization reaction.
A direct and highly convenient organocatalytic method for the preparation of 1,5-dialdo-pyranosides and 1,4-dialdo-furanosides is presented. The method relies on the chemoselective properties of TEMPO in combination with trichloroisocyanuric acid under very mild, basic conditions. Unprotected glycosides are prepared in a single step in high yields and are efficiently purified with the use of solid-phase
biomolecules was developed using C6-oxidized glycans through a carbohydrate-promoted Pictet–Spenglerreaction, providing homogeneous glycoconjugates with stable linkages. This method features high efficiency, mild conditions, robustness, biocompatibility, and applicability to a wide range of substrates, including glycans, peptides, proteins, and living-cell surfaces.
通过碳水化合物促进的 Pictet-Spengler 反应,使用 C6 氧化聚糖开发了针对生物分子 N 末端色氨酸的糖修饰策略,提供具有稳定连接的均质糖缀合物。该方法具有效率高、条件温和、稳健、生物相容性以及适用于多种底物的特点,包括聚糖、肽、蛋白质和活细胞表面。
Tribedi, Partha Sarathi, Journal of the Indian Chemical Society, 2001, vol. 78, # 6, p. 287 - 289