Three new andrastin derivatives from the endophytic fungus <i>Penicillium vulpinum</i>
Yu-Yue Qin, Xishan Huang, Xiaobo Liu, Tu-Xiang Mo, Zhao-Long Xu, Ben-Chao Li, Xiaoya Qin, Jun Li, Till F. Schäberle, Rui‐Yun Yang
Abstract
Three new andrastin derivatives, 10-formyl andrastone A (1), 10-demethylated andrastone A (2) and andrastin G (3), together with four known andrastin analogues (4-7) were isolated from an endophytic fungus Penicillium vulpinum. Their structures were determined by 1 D, 2 D NMR, and the absolute configurations were further determined by experimental and calculated ECD spectra. Compound 5 exhibited significant antibacterial activity against Bacillus paratyphosus B with an MIC value of 6.25 µg·mL−1. Compounds 2 and 6 showed remarkable inhibitory activities against Bacillus megaterium with the MIC value of 6.25 µg·mL−1, respectively.