title: Terpenoids Produced by Actinomycetes: Napyradiomycins from Streptomyces antimycoticus NT17.
abstract: Napyradiomycin SR ( 1), 16-dechloro-16-hydroxynapyradiomycin C2 ( 2), 18-hydroxynapyradiomycin A1 ( 3), 18-oxonapyradiomycin A1 ( 4), 16-oxonapyradiomycin A2 ( 5), 7-demethyl SF2415A3 ( 6), 7-demethyl A80915B ( 7), and ( R)-3-chloro-6-hydroxy-8-methoxy-alpha-lapachone ( 8) were isolated from the culture broth of Streptomyces antimycoticus NT17. These compounds are derivatives of the napyradiomycins isolated previously from Chainia rubra or Streptomyces aculeolatus. The structures of the new compounds, some of which exhibit antibacterial activities, were established by comparing their NMR data with data of related known compounds. The unique structure of 1, containing a highly strained ring, was established by NMR and was confirmed by X-ray analysis. Two of the compounds are C-16 stereoisomers of napyradiomycin A2 and are named napyradiomycins A2a ( 9a) and A2b ( 9b).
authors.affiliation: Faculty of Applied Bioscience, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156-8502, Japan.
authors.forename: Keiichiro
authors.initials: K
authors.lastname: Motohashi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sue
authors.forename: Kazuo
authors.initials: K
authors.lastname: Furihata
authors.forename: Shuichiro
authors.initials: S
authors.lastname: Ito
authors.forename: Haruo
authors.initials: H
authors.lastname: Seto
mesh_terms: D039903:Actinobacteria / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects; D013293:Enterococcus faecalis / Q000187:drug effects; D016984:Enterococcus faecium / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009285:Naphthoquinones / Q000737:chemistry; D013237:Stereoisomerism; D013297:Streptococcus pyogenes / Q000187:drug effects; D013302:Streptomyces / Q000737:chemistry*; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D009285:Naphthoquinones; D013729:Terpenes; C054262:napyradiomycin A2