Tetramic Acids and Pyridone Alkaloids from the Endolichenic Fungus Tolypocladium cylindrosporum
Tetramic Acids and Pyridone Alkaloids from the Endolichenic Fungus Tolypocladium cylindrosporum
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内生真菌 Tolypocladium cylindrosporum 中的特特拉姆酸和吡啶酮生物碱
DOI:
10.1021/np501018w
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发表时间:
2015-09-01
影响因子:
5.1
通讯作者:
Lou, Hong-Xiang
中科院分区:
文献类型:
--
作者:
Li, Xiao-Bin;Li, Lin;Lou, Hong-Xiang
Three new tetramic acid derivatives, tolypodadenols A(1), A(2), and B (1-3), a new pyridone alkaloid, tolypyridone A (4), and a new coumarin derivative, 3,8-dihydroxy-4-(4-hydroxyphenyl)-6-methylcoumarin (5), together with four known compounds (6-9) were isolated from the endolichenic fungus Tolypocladium cylindrosporum, which inhabits the lichen Lethariella zahlbruckneri. Structures of these compounds were determined by comprehensive analysis of spectroscopic data and single-crystal X-ray diffraction determination. Bioassay of the isolated compounds found that pyridoxatin (7) was cytotoxic to human cancer cells by induction of G0/G1 cell cycle arrest and apoptosis.