Ruthenium trichloride catalyzed synthesis of 2,3-unsaturated-N-glycosides via Ferrier azaglycosylation
摘要:
An efficient, economical and mild protocol for the synthesis of 2,3-unsaturated-N-glycosides has been developed using ruthenium(III) chloride. The Ferrier azaglycosylation of glycals with various N-nucleophiles such as sulfonamides, benzamides, carbamates and N-substituted sulfonamides proceeded smoothly to afford the corresponding 2,3-unsaturated-N-glycosides or 'N-pseudoglycals' in good yields (64-98%). High alpha-anomeric selectivity was observed with N-substituted sulfonamides such as N-benzyl or N-phenyl sulfonamides under similar conditions. (C) 2014 Elsevier Ltd. All rights reserved.
GRAPHICAL ABSTRACT[GRAPHICS]A highly efficient and mild method for the synthesis of glycosyl sulfonamides and glycosyl amides from glycal has been described using Zn(OTf)(2) as an economical and environmentally friendly catalyst. Various N-nucleophiles comprising sulfonamides, benzamides, and carbamates were glycosylated with glycals to obtain corresponding 2,3-unsaturated N-glycosides in good yields.
Efficient synthesis of 2,3-unsaturated sulfonamidoglycosides by Amberlyst 15
作者:Carlos A. Témpera、Pedro A. Colinas、Rodolfo D. Bravo
DOI:10.1016/j.tetlet.2010.07.076
日期:2010.10
Sulfonamidoglycosylation of D-glycals in the presence of Amberlyst 15 proceeded effectively to afford the sulfonamidoglycosides in good to high yields with minimal workup and short reaction times. Two N-glycosyl sulfonamides were tested as inhibitors of tumor cell growth in vitro and showed antiproliferative properties in the micromolar range. (C) 2010 Elsevier Ltd. All rights reserved.