Traceless Staudinger Ligation of Glycosyl Azides with Triaryl Phosphines: Stereoselective Synthesis of Glycosyl Amides
作者:Aldo Bianchi、Anna Bernardi
DOI:10.1021/jo060409s
日期:2006.6.1
α-Glycosyl amides can be synthesized from the corresponding O-benzyl-α-glycosyl azides using a tracelessStaudingerligation with diphenylphosphanyl-phenyl esters 4. All the phosphines employed and their phenol precursors are stable to air at 4 °C for months. Fast intramolecular trapping of the reduction intermediates results in the direct formation of the amide link, which, in turn, prevents epimerisation