Novel glycosylation reactions using glycosyl thioimidates of N-acetylneuraminic acid as sialyl donors
作者:Kiyoshi Ikeda、Misato Aizawa、Kazuki Sato、Masayuki Sato
DOI:10.1016/j.bmcl.2006.02.037
日期:2006.5
Novel sialyl donors 4 bearing a thioimidolyl moiety as the leaving group were successfully prepared from the corresponding arylthio derivatives 3 and a peracetylated chloro derivative of Neu5Ac 2 in the presence of N,N-di-isopropylethylamine with moderate yields. The reaction of 4 with various alcohols 5 was effectively activated by AgOTf as the promoter to give the corresponding O-sialosides 6 with