Chemical Synthesis of Uridine Diphospho-<scp>d</scp>-xylose and UDP-<scp>l</scp>-arabinose

Leloir transferases, like UDP-d-xylosyl transferase and arabinosyl transferase, utilize nucleoside diphosphate sugars to build up plant oligo- and polysaccharides. By the described, scalable three-step synthesis a simple route is described to arrive at the respective enzyme substrates, which are otherwise difficult to obtain.