| Literature DB >> 26644336 |
Ippei Kagiyama1, Hikaru Kato1, Tatsuo Nehira2, Jens C Frisvad3, David H Sherman4, Robert M Williams5,5, Sachiko Tsukamoto6.
Abstract
Seven new prenylated indole alkaloids, taichunamides A-G, were isolated from the fungus Aspergillus taichungensis (IBT 19404). Taichunamides A and B contained an azetidine and 4-pyridone units, respectively, and are likely biosynthesized from notoamide S via (+)-6-epi-stephacidin A. Taichunamides C and D contain endoperoxide and methylsulfonyl units, respectively. This fungus produced indole alkaloids containing an anti-bicyclo[2.2.2]diazaoctane core, whereas A. protuberus and A. amoenus produced congeners with a syn-bicyclo[2.2.2]diazaoctane core. Plausible biosynthetic pathways to access these cores within the three species likely arise from an intramolecular hetero Diels-Alder reaction.Entities:
Keywords: alkaloids; biosynthesis; cycloaddition; natural products; structure elucidation
Mesh:
Substances:
Year: 2015 PMID: 26644336 PMCID: PMC4960981 DOI: 10.1002/anie.201509462
Source DB: PubMed Journal: Angew Chem Int Ed Engl ISSN: 1433-7851 Impact factor: 15.336