| Popis: |
The reaction of N -acetyl-α- d -glucofuranosylamine with 2,2-dimethoxypropane, catalyzed by p -toluenesulfonic acid, gave 1-acetamido-2,3:5,6-di- O -isopropylidene-1- O -methyl- d -glucitol (65.6%), 1-acetamido-2,3- O -isopropylidene-1- O -methyl- d -glucitol (3.7%), and N -acetyl-5,6- O -isopropylidene-α- d -glucofuranosylamine (3.2% yield). The structures of these compounds were determined by chemical and spectroscopic methods, and their relation to the pattern of n.m.r. resonances of the isopropylidene methyl groups is discussed. |
