Azidonitration of Di-<i>O</i>-acetyl-<scp>L</scp>-fucal: X-Ray Crystal Structures of Intermediate Azidodeoxysugars and of the Bacterial Aminosugar <i>N</i>-Acetyl-<scp>L</scp>-fucosamine

The azidonitration of di-O-acetyl-l-fucal has previously been shown to be an efficient route to the bacterial aminosugar N-acetyl-l-fucosamine. Upon repeating this sequence, with updated versions of the glycal formation and amide installation steps, we have obtained X-ray crystal structures of several of the addition products, which are now reported along with the solid-state structure of N-acetyl-l-fucosamine itself.