N-Butyl-L-Deoxynojirimycin (L-NBDNJ): Synthesis of an Allosteric Enhancer of alpha-Glucosidase Activity for the Treatment of Pompe Disease.

The highly stereocontrolled de novo synthesis of L-NBDNJ (the unnatural enantiomer of the iminosugar drug Miglustat) and a preliminary evaluation of its chaperoning potential are herein reported. L-NBDNJ is able to enhance lysosomal ?-glucosidase levels in Pompe disease fibroblasts, either when administered singularly or when co-incubated with the recombinant human ?-glucosidase. In addition, differently from its D-enantiomer, L-NBDNJ does not act as a glycosidase inhibitor.