α/ß-Stereo- and diastereoselective glycosylation with n-pentenyl glycoside donors, promoted by N-iodosuccinimide and catalyzed by chiral Brønsted acid.

A method involving stereoselective glycosylation catalyzed by (+)-isomenthol ester of pentacarbomethoxycyclopentadiene as a chiral Brønsted acid, with n-pentenyl glycosides in the presence of N-iodosuccinimide as the promoter is described; this method offered a chiral recognition of racemic substrates.