Article ID Journal Published Year Pages File Type
1385479 Carbohydrate Research 2007 15 Pages PDF
Abstract

Novel aryl β-d-galactopyranosides were synthesized employing phase-transfer catalysis, and assayed as potential galactose donors in the presence of β-galactosidase from bovine testes using pNP-Gal as a reference. The aglycones were represented mainly by nitrophenols containing halogens, hydroxymethyl, aldehyde, carboxyl, ester or amino functions. An unusual intermolecular acetyl migration onto the benzylic alcohol group was observed during galactosylation of hydroxymethylnitrophenols. Pyridyl glycosides were obtained by reaction with the corresponding silver pyridinolates. Glycosides of halo-, hydroxymethyl- or methoxycarbonyl-nitrophenols as leaving groups gave virtually the same yields of transglycosylation products. A minor increase was achieved with nitrosalicylaldehyde as leaving group, whereas carboxy or amino derivatives gave very low or no yield of the transglycosylation product. Commercially available donors such as resorufinyl and 4-methylumbelliferyl β-d-galactopyranosides exhibited a lower transglycosylation potential than these novel pNP-Gal derivatives.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemistry Organic Chemistry
Authors
, ,