Iterative One-Pot α-Glycosylation Strategy: Application to Oligosaccharide Synthesis
作者:Chih-Yueh Ivan Liu、Shaheen Mulani、Kwok-Kong Tony Mong
DOI:10.1002/adsc.201200396
日期:2012.11.26
three iterativeone-potα-glycosylation methods, i.e., one-pot (α,α)-, one-pot (β,α)-, and one-pot (α,β)-glycosylations, were developed. These methods are applicable to a range of thioglycosyl donors, confer stereocontrol in α-/β-glycosidic bond formation, and thus provide for rapid access to oligosaccharides with various permutations of anomeric configurations. The utility of these one-pot glycosylation
Synthesis of a tetrasaccharide related to the O-antigen from Azospirillum lipoferum SR65
作者:Prashant Ranjan Verma、Balaram Mukhopadhyay
DOI:10.1016/j.carres.2009.11.024
日期:2010.2
lipoferum SR65 has been accomplished through suitable protecting group manipulations and stereoselective glycosylation starting from commercially available L-rhamnose and D-glucose. The target oligosaccharide in the form of its p-methoxyphenyl glycoside is suitable for further glycoconjugate formation viaselectivecleavage of the OMP glycoside. Plant growth-promoting bacteria (PGPB) of genus Azospirillum
Linear synthesis of the hexasaccharide related to the repeating unit of the O-antigen from Shigella flexneri serotype 1d (I: 7,8)
作者:Ankita Mitra、Balaram Mukhopadhyay
DOI:10.1016/j.carres.2016.03.012
日期:2016.5
Total synthesis of the hexasaccharide repeating unit of the O-antigen from Shigellaflexneriserotype 1d (I: 7,8), alpha-D-Glcp-(1-->3)-alpha-L-Rhap-(1-->2)-alpha-L-Rhap-(1-->3)-alpha-L-Rhap-(1--> 3)-[alpha-D-Glcp-(1-->4)]-beta-D-GlcpNAc, is reported by following a linear strategy. The target hexasaccharide was synthesized by sequential glycosylations of suitably protected monosaccharide derivatives
Convergent Synthesis of the Hexasaccharide Repeating Unit of the<i>O</i>-Antigenic OPS of<i>Escherichia coli</i>O133
作者:Ankita Mitra、Balaram Mukhopadhyay
DOI:10.1002/ejoc.201900815
日期:2019.8.15
Synthesis of the hexasaccharide repeatingunit of the O-antigen from E. coli O133 has been accomplished with rational protecting group manipulations on commercially available monosaccharides and stereoselective glycosylations through a convergent protocol. A late stage TEMPO mediated oxidation is used to install the required uronic acid moiety. Chloroacetate group is used extensively as a temporary
来自大肠杆菌 O133 的 O-抗原的六糖重复单元的合成是通过对市售单糖和立体选择性糖基化的合理保护基操作通过收敛协议完成的。后期 TEMPO 介导的氧化用于安装所需的糖醛酸部分。氯乙酸酯基团被广泛用作临时保护基团。
Direct Synthesis of 2,6‐Dideoxy‐β‐glycosides and β‐Rhamnosides with a Stereodirecting 2‐(Diphenylphosphinoyl)acetyl Group
The 2-(diphenylphosphinoyl)acetyl group is highly stereodirecting for the construction of challenging β-configured 2,6-dideoxyglycosides and d/l-rhamnosides. Its synthetic potential was demonstrated in linear or convergent approaches to relevant complex carbohydrates. Variable-temperature NMR studies provided evidence that the reaction proceeds by hydrogen-bond-mediated aglycone delivery.