Synthesis of a thio-linked analogue of sialyl Lewis X
作者:Thomas Eisele、Alexander Toepfer、Gerhard Kretzschmar、Richard R. Schmidt
DOI:10.1016/0040-4039(96)00061-5
日期:1996.2
Thiolinked sialylLewisXanalogue 2 was obtained from neuraminic acid, D-galactose, and L-fucose. Galactose was transformed into 3-thiogalactose building block 6 and also into the required 3,4-dithioglucose moiety. Thioglycoside bond formation was performed via base-promoted S-glycosylation [Neu5Acα(2-3S)Gal and Galβ(1-4S)Glc linkages] and via acid catalyzed S-glycosylation [Fucα(1-3S)Glc and Glcβ-(1-1S)heptyl
Chemical Synthesis of the Nonreducing Hexasaccharide Fragment of Axinelloside A Based on a Stepwise Glycosylation Approach
作者:Su-Jia Li、Qing Fang、Ying-Wen Huang、Yi-Yang Luo、Xiao-Dong Mu、Ling Li、Xiao-Chen Yin、Jin-Song Yang
DOI:10.1021/acs.orglett.2c02618
日期:2022.10.7
An expedient synthesis of the nonreducing hexasaccharide fragment of axinelloside A has been completed via a linear stepwise glycosylation approach. Challenges involved in the synthesis include the highly stereoselective construction of five consecutive 1,2-cis-glycosidic linkages and the formation of a sterically crowded 2,3-disubstituted l-fucoside subunit. Protecting group-directing glycosylation