Novel IBX-Mediated Processes for the Synthesis of Amino Sugars and Libraries Thereof We thank Dr. D. H. Huang, Dr. G. Siuzdak, and Dr. R. Chadha for NMR spectroscopic, mass spectrometric, and X-ray crystallographic assistance, respectively, and Prof. H. M. R. Hoffmann and Prof. A. Eschenmoser for helpful discussions. We also thank Dr. Maria-Rosa Rodriguez and Mr. Keith Wilcoxen of these laboratories for early intermediates leading to 9-12. This work was financially supported by the National Institutes of Health (USA), The Skaggs Institute for Chemical Biology, fellowships from the Ministerio de Educacion y Cultura, Spain (J.A.V.) and the National Science Foundation (P.S.B), and grants from Array Biopharma, Pfizer, GlaxoWellcome, Merck, Schering Plough, Hoffmann-LaRoche, Boehringer Ingelheim, DuPont, and Abbott Laboratories.