Novel Efficient Routes to Heparin Monosaccharides and Disaccharides Achieved via Regio- and Stereoselective Glycosidation
作者:Henry N. Yu、Jun-ichi Furukawa、Tsuyoshi Ikeda、Chi-Huey Wong
DOI:10.1021/ol036390m
日期:2004.3.1
methodology for the synthesis of heparin building blocks has been developed. We describe novel efficient routes to both L-iduronicacid and D-glucuronic acid acceptors. Glycosylation with thioglycosides donors gave corresponding disaccharides in a regio- and stereoselective fashion. An improved approach to synthesizing azido-glucose thioglycoside donor to render azido-sugar from mannose via nucleophilic substitution
Preparation of glycosyl halides under neutral conditions
作者:Beat Ernst、Tammo Winkler
DOI:10.1016/s0040-4039(00)99408-5
日期:1989.1
The anomeric hydroxyl group of various furanose and pyranose hemiacetals can be replaced by a fluorine, chlorine, bromine or iodine atom underneutralconditions using haloenamines.
Synthesis of methyl (d-glycopyranosyl azide) uronates
作者:Zoltán Györgydeák、Joachim Thiem
DOI:10.1016/0008-6215(94)00313-5
日期:1995.3
Abstract Sodium hypochlorite oxidation catalysed by 2,2,6,6,-tetramethylpiperidine 1-oxide (TEMPO) is shown to be a mild and efficient approach to the title uronates. In the gluco, galacto, allo , and 2-acetamido-2-deoxy- gluco series, the corresponding β- or α- and β-glycosyl azides could be smoothly oxidised and alternative preparations are compared to this access.