Antifungal activity of alkyl and heterocyclic aza-derivatives of gossypol as well as their complexes with NaClO4 against Fusarium oxysporum f. sp. lupini
摘要:
Eight alkyl and six heterocyclic aza-derivatives of gossypol (2-15) have been synthesized using gossypol (1) extracted from Gossypium Herbaceum cottonseeds. The ability of gossypol aza-derivatives to form complexes with NaClO4 has been investigated by electrospray ionisation (ESI) mass spectra recorded in the positive and negative ion detection modes. The gossypol aza-derivatives have been characterized by FT-IR, H-1 and C-13 NMR spectroscopic methods and subsequently tested for their antifungal properties against Fusarium oxysporum. Four alkyl aza-derivatives (2-5), present in the enamine-enamine tautomeric form, have shown activity comparable or higher than that of gossypol against this fungus. To improve the antifungal activity the complexes of the most active compounds 2-5 with NaClO4 were prepared. Complexes of 2 and 5 with NaClO4 have shown antifungal activity higher than that of the uncomplexed compounds. (C) 2009 Elsevier Ltd. All rights reserved.
Anion–π interaction has been found to play a key role in interfacial phenomena. In this study, we evaluated the anion–π interactions at the solid/water interface. Anion adsorption originating from anion–π interaction at the interfaces followed the hydration energy and the presence of conjugated systems of the anions by the QCM measurements. Force curve measurements revealed that the single-molecule
A new hydrazone of gossypol with 3,6,9-trioxadecylhydrazine (GHTO) has been synthesised and its structure has been studied by H-1 NMR, C-13 NMR, FT-IR spectroscopy and PM5 semiempirical methods. The results have shown that the newly synthesised hydrazone exists in solution in the N-imine N-imine tautomeric form, stabilized by several intramolecular hydrogen bonds among which the (O7HN16)-N-center dot center dot center dot intramolecular hydrogen bond is the strongest. The structure of GHTO is visualized by the PM5 semiempirical calculations. (c) 2006 Elsevier B.V. All rights reserved.
Genetically Encoded Fragment-Based Discovery from Phage-Displayed Macrocyclic Libraries with Genetically Encoded Unnatural Pharmacophores
作者:Arunika I. Ekanayake、Lena Sobze、Payam Kelich、Jihea Youk、Nicholas J. Bennett、Raja Mukherjee、Atul Bhardwaj、Frank Wuest、Lela Vukovic、Ratmir Derda
DOI:10.1021/jacs.1c01186
日期:2021.4.14
genetically encodedlibraries of peptides. A diketone linchpin 1,5-dichloropentane-2,4-dione converts peptide libraries displayed on phage to 1,3-diketone bearing macrocyclic peptides (DKMP): shelf-stable precursors for Knorr pyrazole synthesis. Ligation of diverse hydrazine derivatives onto DKMP libraries displayed on phage that carries silent DNA-barcodes yields macrocyclic libraries in which the
具有非天然药效团的基因编码大环肽文库是发现许多感兴趣靶点的配体的宝贵来源。传统上,此类文库的生成采用“早期”将非天然结构单元掺入化学或翻译产生的大环化合物中。在这里,我们描述了从现成的起始材料开始的此类文库的不同后期方法:基因编码的肽文库。二酮关键 1,5-二氯戊烷-2,4-二酮可将噬菌体上展示的肽库转化为带有 1,3-二酮的大环肽 (DKMP):用于克诺尔吡唑合成的耐贮存前体。将多种肼衍生物连接到携带沉默DNA条形码的噬菌体上展示的DKMP文库上,产生大环文库,其中氨基酸序列和药效团由DNA编码。该文库针对碳酸酐酶富集的具有苯磺酰胺药效基团和纳摩尔K d 的大环化合物进行选择。本手稿中描述的方法可以将不同的药效团移植到许多现有的基因编码噬菌体库中,并显着增加此类库在分子发现中的价值。
Antifungal activity of alkyl and heterocyclic aza-derivatives of gossypol as well as their complexes with NaClO4 against Fusarium oxysporum f. sp. lupini
Eight alkyl and six heterocyclic aza-derivatives of gossypol (2-15) have been synthesized using gossypol (1) extracted from Gossypium Herbaceum cottonseeds. The ability of gossypol aza-derivatives to form complexes with NaClO4 has been investigated by electrospray ionisation (ESI) mass spectra recorded in the positive and negative ion detection modes. The gossypol aza-derivatives have been characterized by FT-IR, H-1 and C-13 NMR spectroscopic methods and subsequently tested for their antifungal properties against Fusarium oxysporum. Four alkyl aza-derivatives (2-5), present in the enamine-enamine tautomeric form, have shown activity comparable or higher than that of gossypol against this fungus. To improve the antifungal activity the complexes of the most active compounds 2-5 with NaClO4 were prepared. Complexes of 2 and 5 with NaClO4 have shown antifungal activity higher than that of the uncomplexed compounds. (C) 2009 Elsevier Ltd. All rights reserved.