containing cis-vicinal diol, the substrate scope also includes glycosides without cis-vicinal diol. For such a substrate scope, usually, only methods using stoichiometric amounts of organotinreagents can lead to the same protection pattern with high selectivities and highly isolated yields (84–97% in most cases). Therefore, SnCl2, as a low toxicity and extremely cheap reagent, should be the best catalyst
The stereocontrolled formation of cyclic vicinal cis-diols via a samarium diiodide pinacol coupling of dialdehydes
作者:Jose Luis Chiara、Walter Cabri、Stephen Hanessian
DOI:10.1016/s0040-4039(00)92024-0
日期:1991.2
Aliphatic 1,5- and 1,6 dialdehydes with and without α-substituents, as well as derivatives of carbohydrate dialdehydes undergo a pinacol coupling reaction in the presence of SmI2 to give cis-diols as the preponderant products. When α-alkoxy groups are present, the diol has an orientation that is opposite to such groups.
Synthesis of D-FucNAc-D-ManNAcA Disaccharides Based On the Capsular Polysaccharides <i>Staphylococcus aureus</i> Type 5 and 8
作者:Satsawat Visansirikul、Stephen A. Kolodziej、Alexei V. Demchenko
DOI:10.1021/acs.joc.8b02612
日期:2019.1.4
To gain a better understanding of the conjugation chemistry taking place at the interface of the capsular polysaccharide repeating units, described herein is the synthesis of two disaccharides. These disaccharides correspond to the connection point of the repeating units of capsular polysaccharide S. aureus serotype 5 (CP5) and serotype 8 (CP8). As in our previous syntheses of trisaccharide repeating