海绵真菌中一个新的聚酮类化合物

A new polyketide from a sponge-derived fungus

利用硅胶柱色谱、凝胶柱、反向柱色谱和高效液相等手段对海绵来源的真菌Alternaria sp.F49在大米培养基中的代谢产物进行分离纯化,从中分离得到一个新的聚酮类化合物:3R,5R-(-)-talaroflavone(2)和15个已知化合物。Ⅰ及Ⅱ是两个消旋体,通过手性柱分别将它们进行拆分得到1和2、3和4两对对应异构体;通过核磁、质谱和文献比对确定了这些化合物的结构,运用X-单晶衍射及圆二色谱等手段确定了化合物1、2的绝对构型;化合物6、8～10首次从该属真菌(Alternaria)中分离出来;化合物16展示出中等的COX-2酶抑制活性,其IC_(50)为7.3μmol·L^(-1)。

A new polyketide： 3R, 5R-（-）-talaroflavone（2）, along with 15 known compounds were isolated from a EtOAc extract of a sponge-derived fungus Alternaria sp. F49. Compounds 1-2 and 3-4 were separated as two pairs of enantiomers by chiral HPLC from Ⅰ and Ⅱ. The structures of compounds 1-16 were elucidated by means of NMR and MS. Furthermore, the absolute configurations of compounds 1-2 were determined by single crystal X-ray diffraction experiment and CD analyses. Compounds 6, 8-10 were isolated from this genus（Alternaria sp.） for the first time. Compound 16 showed moderate COX-2 enzyme inhibitory activity with IC50 of 7.3 μmol·L^-1.