A New Cyclic Hexapeptide and a New Isocoumarin Derivative from the Marine Sponge-Associated Fungus Aspergillus similanensis KUFA 0013
摘要:
从海洋海绵相关真菌Aspergillus similanensis KUFA 0013的培养物乙酸乙酯提取物中分离出一种新的异香豆素衍生物similanpyrone C (1)、一种新的环己肽similanamide (2)和一种新的吡咯并吡喃酮衍生物pyripyropene T (3)。通过一维和二维核磁共振光谱分析确定了化合物的结构,在化合物2的情况下,通过将水解物与d和l氨基酸标准品共注射,利用手性高效液相色谱法分析了其氨基酸成分的立体化学。对化合物2和3进行了体外生长抑制活性评估,分别针对MCF-7(乳腺癌腺癌)、NCI-H460(非小细胞肺癌)和A373(黑色素瘤)细胞系,以及针对参考菌株和环境多重耐药分离株(MRS和VRE)的抗菌活性。只有化合物2对这三种癌细胞系表现出弱活性,并且它们均未显示出抗菌活性。
Structure Revision of Similanamide to PF1171C by Total Synthesis
摘要:
The total synthesis of the proposed structure of similanamide, a cyclic hexapeptide recently isolated from the marine sponge-associated fungus Aspergillus similanensis KUFA 0013, was achieved by solid-phase synthesis of a linear precursor and solution-phase macrolactamization. The NMR spectra of our synthetic final product were not identical to those of the isolated material and led us to conclude that similanamide is identical to PF1171C, a previously reported diastereomeric hexapeptide.