六个倍半萜类化合物1-6,包括两个新的,一种ent-daucane型倍半萜类化合物,曲霉A(1)和一个正癸烷一个,asperaculane B(2),以及四个已知的降丁烷衍生物,aculenes AD 3-6,以及从真菌曲霉曲霉的发酵培养物中分离出已知的乙二醛酸D(7)。通过分析其光谱数据,包括1D和2D-NMR光谱,HR-ESIMS,电子圆二色性(ECD)数据以及量子化学计算,可以确定它们的结构和绝对构型。评估了这些代谢物对两种细胞系,人癌细胞系(HeLa)和一种正常仓鼠细胞系(CHO)的体外细胞毒活性。
Hantupeptins B and C, cytotoxic cyclodepsipeptides from the marine cyanobacterium Lyngbya majuscula
作者:Ashootosh Tripathi、Jonathan Puddick、Michele R. Prinsep、Peter Peng Foo Lee、Lik Tong Tan
DOI:10.1016/j.phytochem.2009.10.006
日期:2010.2
Hantupeptins B (2) and C (3) were isolated, along with the previously reported hantupeptin A (1), from the marine cyanobacterium, Lyngbyamajuscula, collected from Pulau Hantu Besar, Singapore. Their structures were elucidated by interpretation of extensive 1D and 2D NMR spectroscopic data. Compounds 2 and 3 are cyclicdepsipeptides consisting of five alpha-amino/hydroxy acid residues, including phenyllactic
Hantupeptins B (2) 和 C (3) 以及先前报道的 Hantupeptin A (1) 是从从新加坡 Pulau Hantu Besar 收集的海洋蓝藻 Lyngbya majuscula 中分离出来的。它们的结构通过对大量 1D 和 2D NMR 光谱数据的解释得到阐明。化合物2和3是由5个α-氨基/羟基酸残基组成的环状缩肽,包括苯基乳酸、脯氨酸、N-甲基-缬氨酸、缬氨酸、N-甲基-异亮氨酸和不同不饱和度的β-羟基酸单元在每个分子的末端。常见氨基酸和苯基乳酸的绝对构型分别由先进的 Marfey 和手性 HPLC 分析确定。Hantupeptin A 中 3-羟基-2-甲基-7-辛酸部分的完整立体化学通过同核 J 分辨 2D NMR 实验和 MOsher 方法的组合阐明。Hantupeptins B 和 C 在针对 MOLT-4(白血病)和 MCF-7(乳腺癌)细胞系进行测试时显示出中等的体外细胞毒性。
C<sub>3</sub> and 2D C<sub>3</sub> Marfey’s Methods for Amino Acid Analysis in Natural Products
作者:Soumini Vijayasarathy、Pritesh Prasad、Leith J. Fremlin、Ranjala Ratnayake、Angela A. Salim、Zeinab Khalil、Robert J. Capon
DOI:10.1021/acs.jnatprod.5b01125
日期:2016.2.26
Marfey’s method, including an ability to resolve all Ile isomers, against an array of amino acids commonly encountered in natural products and by comparison to an existing Marfey’s method. We also describe an innovative 2D C3 Marfey’s method as an analytical approach for determining the regiochemistry of enantiomeric amino acid residues in natural products. The C3 and 2D C3 Marfey’s methods represent
我们验证了C 3 Marfey方法的改进的分辨率和灵敏度,包括针对天然产物中常见的一系列氨基酸并通过与现有Marfey方法进行比较而解决所有Ile异构体的能力。我们还描述了一种创新的二维C 3 Marfey方法,作为一种确定天然产物中对映体氨基酸残基的区域化学的分析方法。C 3和2 D C 3 Marfey的方法代表了宝贵的工具,可用于探测和定义天然产物中可水解获得的氨基酸残基的立体复杂性。
Total Synthesis and Pharmacological Investigation of Cordyheptapeptide A
The present investigation reports the synthesis of a phenylalanine-rich N-methylated cyclopeptide, cordyheptapeptide A (8), previously isolated from the insect pathogenic fungus Cordyceps sp. BCC 1788, accomplished through the coupling of N-methylated tetrapeptide and tripeptide fragments followed by cyclization of the linear heptapeptide unit. Structure elucidation of the newly synthesized cyclopolypeptide
Verlamelin and its new derivative (verlamelin B) were isolated from fermentation broth of entomopathogenic fungus Lecanicillium sp. HF627. As the structural elucidation of verlamelin so far was only preliminary, we studied and determined the absolute structure of these two compounds to be cyclo(5S-hydroxytetradecanoic acid-D-alloThr/Ser-D-Ala-L-Pro-L-Gln-D-Tyr-L-Val). This is the first study that precisely analyzed the structure of verlamelin.
Yakushinamides A (1) and B (2), prolyl amides of polyoxygenated fattyacids, have been isolated from the marine sponge Theonella swinhoei as inhibitors of HDACs and SIRTs. Their planar structures were determined by interpretation of the NMR data of the intact molecules and tandem FABMS data of the methanolysis products. For the assignment of the relative configurations of the three contiguous oxymethine