Model Studies towards Diazonamide A: Synthesis of the Heterocyclic Core We thank Dr. D. H. Huang, Dr. G. Suizdak, and Dr. R. Chadha for NMR spectroscopic, mass spectrometric, and X-ray crystallographic assistance, respectively. We also thank Professor R. H. Grubbs for a generous gift of catalyst 30. Financial support for this work was provided by The Skaggs Institute for Chemical Biology, the National Institutes of Health (USA), a predoctoral fellowship from the National Science Foundation (S.A.S.), postdoctoral fellowships from the Alfred Benzons Foundation and the Danish Natural Science Research Council (K.B.S.), and grants from Abbott, Amgen, ArrayBiopharma, Boehringer-Ingelheim, GlaxoWellcome, Hoffmann-LaRoche, DuPont, Merck, Novartis, Pfizer, and Schering Plough.
Nicolaou
KC
Department of Chemistry and The Skaggs Institute for Chemical Biology The Scripps Research Institute 10550 North Torrey Pines Road, La Jolla, CA 92037 (USA) and Department of Chemistry and Biochemistry University of California San Diego 9500 Gilman Drive, La Jolla, CA 92093 (USA).
Snyder
SA
Simonsen
KB
Koumbis
AE