Synthesis of β-ketoesters from renewable resources and Meldrum's acid
作者:Rafael C. Brinkerhoff、Hernan F. Tarazona、Patrick M. de Oliveira、Darlene C. Flores、Caroline Da R. Montes D'Oca、Dennis Russowsky、Marcelo G. Montes D'Oca
DOI:10.1039/c4ra08986c
日期:——
β-Ketoesters are valuable building blocks for the synthesis of compounds with different biological activities.
β-酮酯是合成具有不同生物活性化合物的宝贵构建模块。
Robust routes for the synthesis of N-acylated-l-homoserine lactone (AHL) quorum sensing molecules with high levels of enantiomeric purity
作者:James T. Hodgkinson、Warren R.J.D. Galloway、Mariangela Casoli、Harriet Keane、Xianbin Su、George P.C. Salmond、Martin Welch、David R. Spring
DOI:10.1016/j.tetlet.2011.04.059
日期:2011.6
structural analogues is of significant biological interest in the development of methods to manipulate bacterial quorum sensing systems in a useful fashion. In this Letter we report robust routes for the synthesis of a range of N-acylated-l-homoserine lactone (AHL) quorum sensing molecules. Crucially, we have analysed the enantiopurity of the final AHLs and in all cases, excellent levels were observed.
Isolation of the antibiotic pseudopyronine B and SAR evaluation of C3/C6 alkyl analogs
作者:Leah M. Bouthillette、Catherine A. Darcey、Tess E. Handy、Sarah C. Seaton、Amanda L. Wolfe
DOI:10.1016/j.bmcl.2017.04.067
日期:2017.6
for antibacterial activity againstGram-positive and Gram-negative bacteria. We found a direct relationship between antibacterial activity and C3/C6 alkyl chain length. For inhibition of Gram-positive bacteria, alkyl chain lengths between 6 and 7 carbons were found to be the most active (IC50=0.04-3.8µg/mL) whereas short alkyl chain analogs showed modest activity against Gram-negative bacteria (IC50=223-304µg/mL)
An efficient synthesis of novel N-acetyl-3-alkanoyl and 3-dienoyl tetramic acids
作者:Margarita Petroliagi、Olga Igglessi-Markopoulou
DOI:10.1039/a702649h
日期:——
A general synthesis of N-acetyl-3-alkanoyl- and 3-dienoyl-tetramic acids is presented. The condensation of N-(N-acetylglycyloxy)succinimide with β-keto esters bearing alkanoyl or dienoyl groups furnishes the new 3-substituted N-acetyltetramic acids 6–9 and 16 in good yields. The key intermediates 4 and 5 have been isolated and subsequently cyclized to the corresponding tetramicacids. Spectral data
Haloperoxidase Mediated Quorum Quenching by Nitzschia cf pellucida: Study of the Metabolization of N-Acyl Homoserine Lactones by a Benthic Diatom
作者:Michail Syrpas、Ewout Ruysbergh、Lander Blommaert、Bart Vanelslander、Koen Sabbe、Wim Vyverman、Norbert De Kimpe、Sven Mangelinckx
DOI:10.3390/md12010352
日期:——
Diatoms are known to produce a variety of halogenated compounds, which were recently shown to have a role in allelopathic interactions between competing species. The production of these compounds is linked to haloperoxidase activity. This research, has shown that this system may also be involved in diatom-bacteria interactions via the H2O2 dependent inactivation of a type of quorum sensing (QS) molecule, i.e., N-β-ketoacylated homoserine lactones (AHLs), by a natural haloperoxidase system from the benthic diatom Nitzschia cf pellucida. The AHL degradation pathway towards corresponding halogenated derivatives was elucidated via HPLC-MS analysis and the synthesis of a broad series of novel halogenated AHL analogues as reference compounds. Furthermore, their biological activity as quorum sensing modulators was directly compared and evaluated against a series of naturally occurring β-keto-AHLs. It has been demonstrated that the loss of the QS activity results from the final cleavage of the halogenated N-acyl chain of the signal molecules.