Journal
CHEMISTRY & BIODIVERSITY
Volume 17, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbdv.201900547
Keywords
chromones; Ceriops tagal; endophytic fungus; Colletotrichum gloeosporioides; biological activity; cytotoxicity
Funding
- National Natural Science Foundation of China [21662012, 41866005]
- Program for Innovative Research Team in University [IRT-16R19]
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Four previously unreported chromones, 5-hydroxy-2-(hydroxymethyl)-8-methoxy-4H-chromen-4-one (1), (5R,7S)-5,7-dihydroxy-2-propyl-5,6,7,8-tetrahydro-4H-chromen-4-one (2), (5R,7S)-5,7-dihydroxy-2-methyl-5,6,7,8-tetrahydro-4H-chromen-4-one (3), and (5R,7S)-5,7-dihydroxy-2-[(E)-prop-1-en-1-yl]-5,6,7,8-tetrahydro-4H-chromen-4-one (4), as well as one known analogue 5-hydroxy-2-methyl-4H-chromen-4-one (5) were isolated from the fermentation broth of the endophytic fungus Colletotrichum gloeosporioides derived from the mangrove Ceriops tagal. Their structures were elucidated based on extensive spectroscopic analyses. The absolute configurations of 2-4 were determined by comparison the experimental and calculated electronic circular dichroism (ECD) spectra. Compound 2 showed cytotoxic activity against A549 cell line with the IC50 value of 0.094 mm.
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