Abstract
AbstractA new indoleglycerol, designated as arecine (1), and twenty‐three known diketopiperazines 2–24 were isolated from the endophytic fungus Diaporthe arecae associated with mangrove Kandelia obovate. Structures of all secondary metabolites 1–24 were identified on the basis of their spectrometric data, especially the nuclear magnetic resonance, optical rotation, and mass data. The absolute stereochemistry of compound 1 was determined by comparing its experimental electronic circular dichroism spectrum to those of in silico generated. Moreover, the 1H and 13C NMR spectroscopic data of isolated diketopiperazines 3–24 were measured in dimethyl sulfoxide‐d6 and presented in Table 2 for a convenient comparison. Pharmacological study showed cordysinin A (2) possessed mild anti‐angiogenic activity, which suppressed tube formation with an IC50 value of 15.1±0.2 μg/mL.
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