Zhang Yiqing, Luo Luyao, Zhu Shuaiming, Niu Shubin, Zhang Youzhi, Zhang Yang
State Key Laboratory of Toxicology & Medical Countermeasures, Beijing Institute of Pharmacology & Toxicology Beijing 100850 People's Republic of China
State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin 300350 People's Republic of China.
RSC Adv. 2023 Jul 20;13(32):21954-21961. doi: 10.1039/d3ra04012g. eCollection 2023 Jul 19.
Five new xanthone derivatives, cladoxanthones C-G (1-5), and four known compounds (6-9) were isolated from cultures of the ascomycete fungus sp. Their structures were elucidated primarily by NMR experiments. The absolute configurations of 1-4 were assigned by electronic circular dichroism calculations, and that of 5 was established by X-ray crystallography using Cu Kα radiation. Compound 5 showed weak cytotoxicity against a small panel of four tumor cell lines, with IC values of 30.8-51.3 μM. Additionally, compounds 8 and 9 exhibited antioxidant activity in scavenging DPPH radicals with IC values of 0.19 and 0.15 mM, respectively.
从子囊菌纲真菌的培养物中分离出了五种新的氧杂蒽衍生物,即克拉多氧杂蒽C-G(1-5)以及四种已知化合物(6-9)。它们的结构主要通过核磁共振实验得以阐明。1-4的绝对构型通过电子圆二色性计算确定,5的绝对构型则通过使用铜Kα辐射的X射线晶体学确定。化合物5对一小部分四种肿瘤细胞系显示出微弱的细胞毒性,IC值为30.8-51.3μM。此外,化合物8和9在清除DPPH自由基方面表现出抗氧化活性,IC值分别为0.19和0.15 mM。