Methyl 1,2-Orthoesters as Useful Glycosyl Donors in Glycosylation Reactions: A Comparison with n-Pent-4-enyl 1,2-Orthoesters
作者:Clara Uriel、Juan Ventura、Ana M. Gómez、J. Cristóbal López、Bert Fraser-Reid
DOI:10.1002/ejoc.201200089
日期:2012.6
Mannopyranose-derived methyl 1,2-orthoacetates (R = Me) and -benzoates (R = Ph) can function as glycosyldonors – upon BF3·Et2O activation in CH2Cl2 – in glycosylationreactions with monosaccharide acceptors to afford disaccharides in good yields. In the process, glycosylation is preferred to acid-catalyzed rearrangement leading to methyl mannopyranosides. Methyl1,2-orthoesters can be also used in regioselective
Chelating Carboxylic Acid Amides as Robust Relay Protecting Groups of Carboxylic Acids and their Cleavage under Mild Conditions
作者:Manuel C. Bröhmer、Stephan Mundinger、Stefan Bräse、Willi Bannwarth
DOI:10.1002/anie.201100271
日期:2011.6.27
Free choice: Carboxamides of bispicolylamine are alternative protectinggroups for carboxylic acids (see scheme). As a consequence of their straightforward applicability, their high chemical stability towards a broad range of conditions, and their selective cleavage undermildconditions to give either carboxylic acids or their methyl esters, this new protection method should find widespread application
HPLC‐Based Automated Synthesis of Glycans in Solution
作者:Samira Escopy、Yashapal Singh、Keith J. Stine、Alexei V. Demchenko
DOI:10.1002/chem.202201180
日期:2022.7.11
A new experimental set-up for a HPLC-A in solution system includes the following modifications: 4-way split valve, in-line molecular sieve cartridge and a fractioncollector, which enabled fully automated batch synthesis of multiple oligosaccharides with the single press of a button.