analysis. The absolute configurations of the amino acid residues were determined by advanced Marfey’s method. The two structurally related trace metabolites, asperheptatides C and D (3 and 4), were characterized by ESI-MS/MS fragmentation methods. A series of new derivatives (8–26) of asperversiamide A (5) were semisynthesized. The antitubercular activities of 1, 2, and 5–26 against Mycobacterium tuberculosis
在基于 MS/MS 的分子网络的指导下,从珊瑚中分离出四种新的环七肽,即 asperheptatides A–D ( 1 – 4 ) 以及三个已知的类似物 asperversiamide A–C ( 5 – 7 )。衍生真菌花曲霉。通过综合光谱数据分析确定了两种主要化合物 asperheptatides A 和 B(1和2)的平面结构。
氨基酸残基的绝对构型通过先进的 Marfey 方法确定。两种结构相关的微量代谢物,asperheptatides C 和 D(3和4),通过 ESI-MS/MS 碎裂方法进行表征。半合成了一系列新的asperversiamide A ( 5 )衍
生物( 8 – 26 ) 。的抗结核活性1,2,和5 - 26针对结核分枝杆菌H37Ra的也进行了评价。化合物9,13,23,和24呈中度活动,12.5μM的MIC值,代表一个潜在的新类抗结核药物。