De Novo Synthesis of a <scp>d</scp>-Galacturonic Acid Thioglycoside as Key to the Total Synthesis of a Glycosphingolipid from <i>Sphingomonas </i><i>yanoikuyae</i>
作者:Pierre Stallforth、Alexander Adibekian、Peter H. Seeberger
DOI:10.1021/ol800227b
日期:2008.4.1
A concise synthesis of a differentiallyprotected D-galacturonic acid (D-GalA) thioglycoside and the construction of a potent immunomodulating glycosphingolipid are described. The key steps of the synthesis are an Evans aldol reaction between a C4 aldehyde and a PMB-protected glycolyloxazolidinone as well as a tandem-PMB-deprotection/cyclization to thioglycosides. The key glycosylation step is optimized