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A new heptaketide named oryzanigral (1) was isolated from the fermentation extract of the endophytic fungus Nigrospora oryzae isolated from the leaves of Coccinia grandis, along with five known compounds,… Click to show full abstract
A new heptaketide named oryzanigral (1) was isolated from the fermentation extract of the endophytic fungus Nigrospora oryzae isolated from the leaves of Coccinia grandis, along with five known compounds, (R)-mellein, (R)-O-methylmellein, (3R,4R)-4-hydroxymellein, (3R,4S)-4-hydroxymellein and abscisic acid. The structure of oryzanigral was elucidated by spectroscopic analyses including 2D-NMR. A plausible biosynthetic pathway involving Diels-Alder reaction was proposed for compound 1 and related polyketides previously reported. In addition, structure revision of the double bond geometry for coicenal A was described.
Journal Title: Natural product research
Year Published: 2023
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