Selective synthesis of anomeric α-glycosyl acetamides via intramolecular Staudinger ligation of the α-azides
摘要:
alpha-Glycosyl azides can be transformed into the corresponding alpha-glycosyl acetamides with complete retention of configuration via reduction-acylation (Staudinger ligation) reactions using specifically functionalized phosphines. The of alpha-acetamides of per-O-benzylated-fucose, per-O-benzylated-glucose and per-O-benzylated-galactose were selectively synthesized by this process. (C) 2004 Elsevier Ltd. All rights reserved.
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
Selective synthesis of anomeric α-glycosyl acetamides via intramolecular Staudinger ligation of the α-azides
作者:Aldo Bianchi、Anna Bernardi
DOI:10.1016/j.tetlet.2003.12.159
日期:2004.3
alpha-Glycosyl azides can be transformed into the corresponding alpha-glycosyl acetamides with complete retention of configuration via reduction-acylation (Staudinger ligation) reactions using specifically functionalized phosphines. The of alpha-acetamides of per-O-benzylated-fucose, per-O-benzylated-glucose and per-O-benzylated-galactose were selectively synthesized by this process. (C) 2004 Elsevier Ltd. All rights reserved.