| abstract |
A process for preparing methyl 5-acetamido-4-amino-6- (1,2,3-triacetoxypropyl) -5,6-dihydro-4H-pyran-2-carboxylate (V), a process comprising reducing 5- acetamido-4-azido-6- (1,2,3-triacetoxypropyl) -5,6-dihydro-4H pyran-2-carboxylic acid methyl ester (IV) in the presence of a reducing agent, wherein the reducing agent is zinc / 5 ammonium chloride |