Porpoisamides A and B, two novel epimeric cyclic depsipeptides from a Florida Keys collection of Lyngbya sp.
作者:Theresa Meickle、Sarath P. Gunasekera、Yanxia Liu、Hendrik Luesch、Valerie J. Paul
DOI:10.1016/j.bmc.2011.05.051
日期:2011.11
NMR-guided fractionation of a non-polar extract of a Florida Keys collection of Lyngbya sp. resulted in the isolation of two novel epimeric cyclic depsipeptides, porpoisamides A (1) and B (2). The planar structures of these compounds were determined using NMR spectroscopic techniques. The absolute configurations of amino and hydroxy acid subunits were assigned by enantioselective HPLC analysis. These
佛罗里达礁岛群Lyngbya sp.非极性提取物的 NMR 引导分馏。导致分离出两种新型差向异构环状缩肽,porpoisamides A ( 1 ) 和 B ( 2 )。这些化合物的平面结构使用核磁共振光谱技术确定。氨基和羟基酸亚基的绝对构型通过对映选择性 HPLC 分析确定。这些化合物对 HCT-116 结直肠癌和 U2OS 骨肉瘤细胞显示出弱的细胞毒性。porpoisamides 是一对独特的环状缩酚肽,它们在 β-氨基酸的 C-2 位差向异构,即 3-氨基-2-甲基辛酸。