Synthesis of Oligosaccharides of Motifs D and E of Arabinogalactan Present in <i>Mycobacterium </i><i>t</i><i>uberculosis</i>
                                
                                    
                                        作者:Mukund K. Gurjar、L. Krishnakanth Reddy、Srinivas Hotha                                    
                                    
                                        DOI:10.1021/jo010180a
                                    
                                    
                                        日期:2001.6.1
                                    
                                    Syntheses of the ethyl glycosides of 5-O-(beta -D-galactofuranosyl)-beta -D-galactofuranose and 5-O-(alpha -D-arabinofuranosyl)-6-O-(beta -D-galactofuranosyl)-beta -D-galactofuranose present in motifs D and E of Mycobacterium tuberculosis arabinogalactan, respectively, have been presented. The pentenyl-mediated O-glycosylation reaction was utilized to obtain the disaccharide of motif D. The first coupling reaction to prepare the inner disaccharide portion of motif E was accomplished by trichloroacetamidate method while the installation of the terminal sugar by pentenyl glycosylation approach was successful.