Two cytotoxic stereoisomers of malyngamide C, 8-epi-malyngamide C and 8-O-acetyl-8-epi-malyngamide C, from the marine cyanobacterium Lyngbya majuscula
作者:Harald Gross、Kerry L. McPhail、Douglas E. Goeger、Frederick A. Valeriote、William H. Gerwick
DOI:10.1016/j.phytochem.2010.07.001
日期:2010.10
8-O-acetyl-8-epi-malyngamide C (1) and 8-epi-malyngamide C (3) have been isolated along with known compounds 6-O-acetylmalyngamide F (5), H (6), J (7) K (8), and characterized from a Grenada field collection of the marine cyanobacterium Lyngbyamajuscula. The structures of these compounds were deduced by 1D and 2D NMR spectroscopic and mass spectral data interpretation. Absolute configurations were determined by
木香酰胺 C 的两种差向异构体 8-O-乙酰基-8-epi-malyngamide C (1) 和 8-epi-malyngamide C (3) 已与已知化合物 6-O-乙酰基马来酰胺 F (5)、H ( 6)、J (7) K (8),特征来自格林纳达海洋蓝藻 Lyngbya majuscula 的野外收集。这些化合物的结构是通过一维和二维核磁共振光谱和质谱数据解释推导出来的。绝对构型由 CD 光谱、化学降解和可变温度 Mosher 方法的组合确定。化合物 1-5、7 和 8 对 NCI-H460 人肺肿瘤和神经 2a 癌细胞系显示出中等的细胞毒性,IC(50) 值介于 0.5 和 20 microg/mL 之间。