Glycosyl donors and accepters may be covalently linked to aspartic acid residues via OH-6 esters. Peptide elaboration allows glycosylation reactions to be performed between donors and accepters linked to this peptide template. These reactions display increased regio- and stereoselectivities, which are dependent on the nature of the peptide. Simple molecular modelling is used to rationalise the differing product distributions obtained by variation of the linking amino acid sequence. (C) 2000 Elsevier Science Ltd. All rights reserved.
完全正交保护的天冬氨酸衍生物FmocAsp(OBn)O t Bu易于大规模合成。β-羧酸的去保护基团允许通过游离羟基与各种糖衍生物偶联以产生新的糖基氨基酸。干净地实现随后的α-酸或氮的脱保护,以使其能够精加工成寡肽,同时也易于实现对PMB保护的糖羟基的选择性脱保护。这样的新颖的糖基氨基酸构件可以用于新颖的糖肽文库的组合合成。