visible-light-induced palladium-catalyzedHeckreaction for bromine sugars and aryl olefins with high regio- and stereochemistry selectivity for the preparation of C-glycosyl styrene is described. This reaction takes place in one step at room temperature by using a simple and readily available starting material. This protocol can be scaled up to a wide range of glycosyl bromide donors and aryl olefin substrates
Chromic acid oxidation in the synthesis of uronic acids. Use of the O-levulinoyl group to minimize acyl migration
作者:Rabindra N. Rej、John N. Glushka、Warren Chew、Arthur S. Perlin
DOI:10.1016/0008-6215(89)84092-3
日期:1989.6
include levulinoyl at O-5 of acylic and furanose derivatives, and both eq and ax O-4 of pyranose derivatives. It is also shown that, because of the acidity of the Jones reagent, use of the O -levulinoyl group, in combination with a primary p -anisyldiphenylmethyl substituent, permits sequential rapid hydrolysis of the latter and oxidation of the newly exposed alcohol group, which favors high overall yields
[EN] DRUG DELIVERY<br/>[FR] ADMINISTRATION DE MÉDICAMENT
申请人:UNIV OXFORD INNOVATION LTD
公开号:WO2019211595A1
公开(公告)日:2019-11-07
A drug delivery vehicle comprising a vesicle conjugated to one or more targeting groups, wherein the targeting groups comprise an oligosaccharide which is Lewis A or Lewis B or a mimetic thereof, or a pharmaceutically acceptable salt or PEGylated form of the oligosaccharide : (I) wherein R represents the pointof attachment to the vesicle.10
Chemical Synthesis of the Galacturonic Acid Containing Pentasaccharide Antigen of the O-Specific Polysaccharide of <i>Vibrio cholerae</i> O139 and Its Five Fragments
作者:Xiaowei Lu、Pavol Kováč
DOI:10.1021/acs.joc.6b01019
日期:2016.8.5
Three pentasaccharides, two tetrasaccharides, and a trisaccharide fragment of the O-specific antigen of Vibrio cholerae O139 were synthesized by applying 1 + 1, 2 + 1, 3 + 1, and 4 + 1 coupling strategies. The most challenging tasks involved were the synthesis of the 1,2-cis-glycosidic linkage between galactose and the linker (spacer) molecule and final purification of the target multicharged substances