On the Antibiotic and Antifungal Activity of Pestalone, Pestalachloride A, and Structurally Related Compounds
作者:Daniel Augner、Oleg Krut、Nikolay Slavov、Dario C. Gerbino、Hans-Georg Sahl、Jürgen Benting、Carl F. Nising、Stefan Hillebrand、Martin Krönke、Hans-Günther Schmalz
DOI:10.1021/np400301d
日期:2013.8.23
than 10 years, 1 had been considered as a promising new antibiotic compound, the reported MIC against methicillin-resistant Staphylococcus aureus (MRSA) being 37 ng/mL. After overcoming the limited availability of 1 by total synthesis (N. Slavov et al., 2010) we performed new biological tests, which did not confirm the expected degree of antibiotic activity. The observed activity of pestalone against
Pestalone(1)是由M. Cueto等人首先分离的重要海洋天然产物。在2001年,一种海洋真菌与一种海洋细菌共同发酵而来。十多年来,人们一直认为1是一种有前途的新抗生素化合物,据报道抗甲氧西林金黄色葡萄球菌(MRSA)的MIC为37 ng / mL。在通过全合成方法克服了有限的1可用性之后(N. Slavov等,2010),我们进行了新的生物学测试,该实验未能证实预期的抗生素活性。如在两个实验室中独立测定的,可观察到的鼠疫对不同的MRSA菌株的活性为3–10μg/ mL。许多合成的衍生物的1与1对MRSA和一系列植物病原体的抗性相比,包括杀虫草酰氯A和其他异吲哚啉酮(由1与胺反应形成)没有表现出更高的活性。
<i>N</i>-Capping of Primary Amines with 2-Acyl-benzaldehydes To Give Isoindolinones
作者:Daniel Augner、Dario C. Gerbino、Nikolay Slavov、Jörg-Martin Neudörfl、Hans-Günther Schmalz
DOI:10.1021/ol202271k
日期:2011.10.7
A unique reactivity pattern, first observed in the conversion of the marine natural product pestalone into pestalachloride A, was investigated. It was shown that 2-formyl-arylketones smoothly react with ammonia and primary amines, respectively, under mild conditions to afford 3-substituted isoindolinones in high yield. The reaction represents a new option for the derivatization (N-capping) of primary amines. As the substrates are readily accessible the methodology opens a short and modular access to pharmaceutically relevant substituted isoindolinones.
Total Synthesis of the Marine Antibiotic Pestalone and its Surprisingly Facile Conversion into Pestalalactone and Pestalachloride A
Surprise, surprise! The total synthesis of the marine natural product pestalone (1), a highly substituted benzophenone with strong antibiotic acitivity, has provided insight into the surprising tendency of this and related molecules to undergo intramolecular Cannizzaro–Tishchenko‐type reactions. Pestalone can be readily converted into pestalachloride A, a strongly antifungal metabolite isolated from