Efficient and stereoselective 1,2-cis glycoside formation of 5-thioaldopyranoses: glycosylation with peracetylated 5-thio-D- arabinopyranosyl and 5-thio-L-fucopyranosyl trichloroacetimidates
摘要:
Trichloroacetimidate method was proved to be effective for 5-thio-D-arabinopyranosylation and 5-thio-L-fucopyranosylation of N-acetyl-D-glucosaminides and D-galactosides. In these 5-thioglycosylation the neighboring group participation of 2-0-acetyl function was not decisive of anomeric stereoselectivity to give 1,2-cis pseudodisaccharides predominantly. Allyl 2-O-(5-thio-alpha-L-fucopyranosyl)-beta-D-galactopyranoside showed potent inhibitory activity toward alpha-L-fucosidase (Ki = 30muM).
A Simple Synthesis of C-8 Modified 2-Keto-3-deoxy-d-manno-octulosonic Acid (KDO) Derivatives
作者:Milton Kiefel、Renee Winzar、Jessica Philips
DOI:10.1055/s-0029-1219356
日期:2010.3
This paper describes a simple and efficient method with which to prepare C-8 modified 2-keto-3-deoxy-d-manno-octulosonic acid (KDO) derivatives from C-5 modified arabinose derivatives.