Sorbicillin analogues and related dimeric compounds from Penicillium notatum.
In our screening of microorganisms for new natural products, the fungus Penicillium notatum delivered further members of the sorbicillin family, namely, the sohirnones A [3, 1-(2,4-dihydroxy-5-methylphenyl)hex-4-en-1-one], B [4a, 1-(2,4,5-trihydroxy-3,6-dimethylphenyl)hexa-2,4-dien-1-one], and C [5, 1-(2,4,5-trihydroxy-3,6-dimethylphenyl)hex-4-en-1-one]. A stable tautomer of oxosorbicillinol (7) was characterized as 6, and the recently described 7-deacetoxyyanuthone (8) was reisolated. The additionally isolated rezishanones A-D (12-13c) are the first natural Diels-Alder products of sorbicillinol (1) with dienophiles not related with 1. The monomers and dimers showed weak antibacterial activity, but were inactive against fungi and algae. The structures were determined by spectroscopic methods and by comparison of the NMR data with those of the structurally related 2',3'-dihydrosorbicillin (2) and, in the case of 4a, by transformation into the known sorrentanone (4b).
Department of Organic and Biomolecular Chemistry, University of Göttingen, Germany.
Rajendra P
RP
Maskey
Iris
I
Grün-Wollny
Hartmut
H
Laatsch
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D003512:Cyclohexanones / Q000737:chemistry; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010408:Penicillium chrysogenum / Q000737:chemistry*; D012118:Resorcinols / Q000737:chemistry* / Q000302:isolation & purification* / Q000494:pharmacology
D000900:Anti-Bacterial Agents; D003512:Cyclohexanones; D012118:Resorcinols; C502648:sohirnone A; C502650:sohirnone B; C502649:sohirnone C; C453419:sorbicillinol; C473616:sorbicillin