Pseudo-sugars. 3. Alternative Synthesis of Penta-N,O-acetyl-DL-validamine and Its Analogs

DL-Validamine and its amino deoxy and deoxy analogs were synthesized as the acetyl derivatives from endo-7-oxabicyclo[2.2.1]hept-5-ene-2-carboxylic acid, the Diels-Alder adduct of acrylic acid and furan.