Abstract
The glycosyl amino acids α-GalNAc-Ser and α-GalNAc-Thr are fundamental building blocks for glycopeptide synthesis, Schmidt’s synthesis method often being chosen for this purpose. Methyl esters used as orthogonal carboxylic acid protecting group in this procedure were found to be an efficient and inexpensive alternative to other groups. The mild selective methyl ester deprotection by LiI improved the efficiency of the synthesis method.
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