Preparation of Some Glycosyl Amino Acid Building Blocks via Click Reaction and Construction of a Glycotetrapeptide Library Using Spot Synthesis
作者:Kai Günther、Carsten Schips、Thomas Ziegler
DOI:10.1080/07328300802419873
日期:2008.12.11
The copper-catalyzed 1,3-dipolar cycloaddition reaction between ethyl 2,3,4-tri-O- actetyl-6-azido-6-deoxy-1-thio-beta-D-glucopyranoside (2), ethyl 2,3,4-tri-O-actetyl-6-azido-6-deoxy-1-thio-beta-D-galactopyranoside (4), methyl 2,3,4-tri-O-acetyl-6-azido-6-deoxy-alpha-D-mannopyranoside (7), and methyl 2,3,6-tri-O-acetyl-2-azido-2-deoxy-beta-D-glucopyranoside (9), and tert-butyl-protected Fmoc-asparaginic acid propargylamide (10) gave the corresponding protected glycosyl amino acid building blocks 11, 13, 15, and 17 in 67% to 95% yield. The latter were converted into the corresponding pentafluorophenyl esters 12, 14, 16, and 18, which were used for a spot synthesis of a combinatorial library containing 256 glycotetrapeptides. The library was screened for lectin-binding affinity with the lectins Concanavalin A (Con A), phaseolus vulgaris (PHA-E), and galantus nivalis (GNA).