Four New Chromone Derivatives from Colletotrichum gloeosporioides
You‐Ping Luo, Xiao‐Ping Song, Cai‐Juan Zheng, Guang‐Ying Chen, Xu–Xia Luo, Jing‐Xian Han
Chemistry & Biodiversity
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.
Circular dichroism, Absolute configuration, Natural products, Medicinal