Building blocks for glycopeptide synthesis: glycosylation of 3-mercaptopropionic acid and Fmoc amino acids with unprotected carboxyl groups
作者:Mikael Elofsson、Björn Walse、Jan Kihlberg
DOI:10.1016/0040-4039(91)80548-k
日期:1991.12
3-Mercaptopropionic acid and Fmoc aminoacids, having unprotected carboxyl groups, were glycosylated with sugar 1,2-trans-acetates in 90 and 53–65% yields, respectively, under Lewis acid promotion. The synthesis of a neoglycopeptide illustrates the use of the buildingblocks in solid phase peptide synthesis.
Abstract Enzymic hydrolysis of “polygalacturonicacid” gave a mixture of oligomers which was fractionated by ion-exchange chromatography. The resulting di- and tri-saccharides were treated, respectively, with methanol and ethylene oxide, and the resulting esters were reduced with sodium borohydride. Treatment of the products with acetic anhydride and sulfuric acid, followed by deacetylation, produced