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Structural Revision of Aspernigrin A, Reisolated from Cladosporium Herbarum IFB-E002

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Journal J Nat Prod
Date 2005 Jul 26
PMID 16038560
Citations 18
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Abstract

Aspernigrin A was reisolated as a secondary metabolite of the Cynodon dactylon-associated endophytic fungus Cladosporium herbarum IFB-E002 coproducing rubrofusarin B, fonsecinone A, 7-hydroxy-4-methoxy-5-methylcoumarin, orlandin, kotanin, and 3beta,5alpha,6beta-trihydroxyergosta-7,22-diene. The structure of aspernigrin A, previously elucidated to be 4-benzyl-6-oxo-1,6-dihydropyridine-3-carboxamide (1), was revised as 6-benzyl-4-oxo-1,4-dihydropyridine-3-carboxamide (2) on the basis of its additional NMR spectroscopic data and the X-ray crystallographic analysis.

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