Synthesis and α-Glucosidase II inhibitory activity of valienamine pseudodisaccharides relevant to N-glycan biosynthesis
作者:Ian Cumpstey、Clinton Ramstadius、K. Eszter Borbas、Dominic S. Alonzi、Terry D. Butters
DOI:10.1016/j.bmcl.2011.07.046
日期:2011.9
Valienol-derived allylic C-1 bromides have been used as carbaglycosyl donors for alpha-xylo configured valienamine pseudodisaccharide synthesis. We synthesised valienamine analogues of the Glc(alpha 1 -> 3)Glc and Glc(alpha 1 -> 3) Man disaccharides representing the linkages cleaved by alpha-Glucosidase II in N-glycan biosynthesis. These (N1 -> 3)-linked pseudodisaccharides were found to have some alpha-Glucosidase II inhibitory activity, while two other (N1 -> 6)-linked valienamine pseudodisaccharides failed to inhibit the enzyme. (C) 2011 Elsevier Ltd. All rights reserved.
Iridium-catalysed condensation of alcohols and amines as a method for aminosugar synthesis
Primary carbohydrate amines at primary and secondary carbons are alkylated by alcohols in the presence of [Cp*IrCl2]2. When primary carbohydrate alcohols are used as the coupling partners and in the presence of Cs2CO3, amine-linked pseudodisaccharides are obtained. Secondary carbohydrate alcohols are unaffected under these conditions, which allows regioselective reactions.