Indolediketopiperazine Alkaloids from Eurotium cristatum EN-220, an Endophytic Fungus Isolated from the Marine Alga Sargassum thunbergii
作者:Feng-Yu Du、Xin Li、Xiao-Ming Li、Li-Wei Zhu、Bin-Gui Wang
DOI:10.3390/md15020024
日期:——
new indolediketopiperazine derivatives (1-4), along with nine known congeners (5-13), were isolated and identified from the culture extract of Eurotium cristatum EN-220, an endophytic fungus obtained from the marine alga Sargassum thunbergii. The structures of thesecompounds were elucidated on the basis of extensive spectroscopic analysis and the absolute configurations of compounds 1-4 were established
从cr鱼EN-220(一种从海藻Sargassum thunbergii获得的内生真菌)的培养提取物中分离并鉴定了四种新的吲哚二酮哌嗪衍生物(1-4)以及九种已知同源物(5-13)。在广泛的光谱分析的基础上阐明了这些化合物的结构,并通过NOESY实验和通过其酸水解物的手性HPLC分析确定了化合物1-4的绝对构型。首先通过电子圆二色性(ECD)计算确定了五种前棘球蛋白类别中的C-8(被羟基取代的季碳)的绝对构型。对所有这些化合物的盐水虾(卤虫)杀伤力和杀线虫活性以及抗氧化和抗菌效力进行了评估。