Unprotected Oligosaccharides as Phase Tags: Solution-Phase Synthesis of Glycopeptides with Solid-Phase Workups
作者:Showming Wen、Zhongwu Guo
DOI:10.1021/ol0101988
日期:2001.11.1
[reaction--see text] N-Linked glycopeptides were synthesized from glycosyl asparagines containing unprotected oligosaccharides and other simple amino acids by an Fmoc method. The free oligosaccharide chains were used as phase tags to facilitate the product isolation by a precipitation method. Thus, while the elongation of glycopeptides was achieved in a solution of N-methylpyrrolidinone (NMP), the
A novel one-pot synthetic route to 4-acetylamino-2-cyano-3-hydroxybut-2-enoates in good yields (63–71%) is reported. An HPLC analysis of these compounds showed very good enantiomeric excesses (90–94%), justifying the success of our methodology to maintain the stereochemical integrity of the starting materials used.