Preparation of ether-linked 2-acetamido-2-deoxy β-glycolipids via zinc chloride promoted coupling of Ac4GlcNAcCl with lipid hydroxy groups
作者:Erukulla Ravi Kumar、Hoe-Sup Byun、Sihe Wang、Robert Bittman
DOI:10.1016/s0040-4039(00)75823-0
日期:1994.1
Stereoselective glycosidation of lipid hydroxy groups has been achieved using 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-alpha-D-glycosyl chloride as the glycosyl donor in CH2Cl2. In the presence of ZnCl2 (1 equiv.) and various ''promoters'' (1 equiv.) such as Ph(3)CCl, 18-crown-6/KCl, n-Bu(4)NBr, or Me(3)SiCl, beta-glycolipid conjugates are formed as the initial products, but they undergo anomerization on prolonged reaction times. The promoters may enhance the solubility of ZnCl2 in CH2Cl2.