1590392-16-7Relevant articles and documents
Stereoselective synthesis of β-D-GlcNAc-(1→4)-D-Glc disaccharide starting from lactose
Guazzelli, Lorenzo,Catelani, Giorgio,D'Andrea, Felicia,Gragnani, Tiziana
, p. 44 - 49 (2014/05/06)
The stereoselective preparation of the β-D-GlcNAc-(1→4)-D-Glc disaccharide starting from known 4-O-[6-O-(1-methoxy-1-methylethyl)-3,4-O- isopropylidene-β-D-talopyranosyl]-2,3:5,6-di-O-isopropylidene-aldehydo-D- glucose dimethyl acetal (2), in turn easily obtained from lactose, is reported. Key steps of this new procedure, that avoids the glycosylation reaction, are (a) a first epimerization at C-4' through an unusual procedure involving a completely stereospecific hydroboration-oxidation of the enol ether group of the hex-4-enopyranoside 4, obtained from 3 by base promoted acetone elimination, (b) an amination with inversion by S reaction on an imidazylate intermediate, and, finally, (c) N-acetylation followed by complete deprotection.