Stereoselective Synthesis of α-Glycosyl Azides by TMSOTf-Mediated Ring Opening of 1,6-Anhydro Sugars
作者:Mathieu L. Lepage、Anne Bodlenner、Philippe Compain
DOI:10.1002/ejoc.201201580
日期:2013.4
Access to α-glycosylazides in modest to high diastereoselectivity by way of TMSN3 ring-opening of 1,6-anhydrosugars mediated by TMSOTf is reported. The reaction tolerates a wide variety of functional groups including alcohol, alkyne,
The synthesis of clickable polysaccharides was achieved by using alkynylated 1,6-anhydro glucopyranose as a monomer and BF3.OEt2 as an effective catalyst. Subsequent click conjugation with polyethylene glycol (PEG) afforded PEG-grafted polysaccharides in nearly quantitative efficiency.