Abstract
The isolation, characterization and properties of 2 by-products in the preparation of 2-acetamido-3, 4, 6-tri-O-acetyl-2-deoxy-[beta]-D-glucopy- ranosylamine are described. They are bis-(2-acetamido-2-deoxy-D-glucopyranosyl)amines. An independent synthesis of the bis-glyco-pyranosylamines is reported and conditions are given for their preparation in high yield. Further improvements are given for the synthesis of 2-acetamido-l-N-([beta]-L-aspartyl)-2-deoxy-[beta]-D-glucopyrano-sylamine and the a -L-aspartyl isomer. The synthesis of 2-acetamido-l-N-acetyl-2-deoxy-[beta]-D-glucopyranosylamine is described.