Three new compounds designated as cycloaspeptides A (1), B (2), and C (3) were isolated along with ergosterol from the mycelial chloroform extract of Aspergillus sp. NE-45. The structures of cycloaspeptides A. B, and C were established on the basis of chemical and spectroscopic evidence as 1, 2, and 3, respectively. Cycloaspeptides are new cyclic pentapeptides containing an anthranilic acid residue and two N-methyl amino acid residues.
Discovery, Synthesis, and Insecticidal Activity of Cycloaspeptide E
作者:Paul Lewer、Paul R. Graupner、Donald R. Hahn、Laura L. Karr、Dennis O. Duebelbeis、Justin M. Lira、Peter B. Anzeveno、Stephen C. Fields、Jeffrey R. Gilbert、Cedric Pearce
DOI:10.1021/np060219c
日期:2006.10.1
proposed name cycloaspeptide E (1). The structure, which was determined on the basis of spectroscopic (NMR, UV, MS) data and Marfey amino acid analysis, was the tyrosine desoxy version of cycloaspeptide A (2). Two synthetic routes to compound 1 were developed: one a partial synthesisfrom 2 and the other a totalsynthesisfrommethyl alaninate hydrochloride. Cycloaspeptide E, the first member of this