A Stereoselective Synthesis of <i>N</i>-β-<scp>d</scp>-Glycosyl Amides by a Ritter-type Reaction
作者:Rawle Hollingsworth、Xuezheng Song
DOI:10.1055/s-2006-958417
日期:2006.12
A facile stereoselective synthesis of protected N-glycosyl amides is reported. Peracetates or perpivaloates of monosaccharides with gluco-, galacto- and manno-configurations react with acetonitrile in a Ritter-like fashion under acidic condition. The stereoselectivity of this anomeric Ritter-type reaction strongly favors β-anomers of N-d-glycosyl amides regardless of the configurations of the sugars.
The synthesis of glycopyranosylamines is described from the reaction of glycopyranosyl isothiocynates with bis(tributyltin) oxide. The method is simple and efficient allowing, under very mild conditions, the synthesis of N-acyl glycopyranosylamines in one pot. The reactions were performed using both 2-deoxy-2-iodo glycopyranosyl isothiocyanates and glycopyranosyl isothiocyanates derived from mono-