Title
Four New Chromone Derivatives from Colletotrichum gloeosporioides
Author
You‐Ping Luo, Xiao‐Ping Song, Cai‐Juan Zheng, Guang‐Ying Chen, Xu–Xia Luo, Jing‐Xian Han
Year
2020
Journal
Chemistry & Biodiversity
Abstract
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.
Instrument
J-715
Keywords
Circular dichroism, Absolute configuration, Natural products, Medicinal