title: Polyketides from the ascomycete fungus Leptosphaeria sp.
abstract: The new polyketides leptosphaerins A-G (1-7) and the known compounds monodictysin B (8), 2-(2,6-dihydroxybenzoyl)-3-hydroxy-5-methylbenzoic acid (9), and 2-(2,6-dihydroxy-4-methylbenzoyl)-6-hydroxybenzoic acid (10) have been isolated from solid cultures of the ascomycete fungus Leptosphaeria sp. The absolute configurations of compounds 1, 2, and 6 were assigned using the modified Mosher method, whereas that of C-2 in 3 was determined via the circular dichroism data of the [Rh(2)(OCOCF(3))(4)] complex. Compound 7 showed antifungal activity against Aspergillus flavus.
authors.affiliation: Key Laboratory of Systematic Mycology & Lichenology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Lin
authors.forename: Shuchun
authors.initials: S
authors.lastname: Liu
authors.forename: Bingda
authors.initials: B
authors.lastname: Sun
authors.forename: Shubin
authors.initials: S
authors.lastname: Niu
authors.forename: Erwei
authors.initials: E
authors.lastname: Li
authors.forename: Xingzhong
authors.initials: X
authors.lastname: Liu
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Che
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001203:Ascomycota / Q000737:chemistry*; D001231:Aspergillus flavus / Q000187:drug effects*; D002942:Circular Dichroism; D018942:Macrolides / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D018609:Tibet
chemical_list: D000935:Antifungal Agents; D018942:Macrolides