Easily Accessible, Highly Potent, Photocontrolled Modulators of Bacterial Communication
摘要:
External control of bacterial communication quorum sensing allows for the regulation of a multitude of biological processes. Herein, we describe the development of a new synthetic methodology, as well as the characterization, photoisomerization, and biological evaluation of a privileged series of novel photoswitchable quorum-sensing agonists and antagonists. The presented method allows for the rapid and convenient synthesis of previously unknown photoswitchable agonists with up to 70% quorum-sensing induction and inhibitors reaching up to 40% inhibition, which significantly extends the level of photocontrol over bacterial communication achieved before, Remarkably, for the lead photoswitchable agonist, a >700-fold difference in activity was observed between the irradiated and non-irradiated forms, which allows for antagonismto-agonism switching upon exposure to light, showing levels of control unprecedented in photopharmacology, Finally, utilizing this system, we were able to regulate toxin production in Pseudomonas aeruginosa with light.
Phenyliodine(III) Diacetate (PIDA) Mediated Synthesis of Aromatic Azo Compounds through Oxidative Dehydrogenative Coupling of Anilines: Scope and Mechanism
An efficient and environmentally benign method has been developed for the synthesis of symmetrical and unsymmetrical aromatic azo compounds through phenyliodine(III) diacetate (PIDA) mediatedoxidative dehydrogenative coupling of anilines in high yields. The scope of the reaction is broad for both homo- and cross-dimerization. A plausible reaction mechanism has been proposed based on a structurally
Influence of the environment on kinetics and electronic structure of asymmetric azobenzene derivatives — experiment and quantum-chemical calculations
作者:K Matczyszyn、W Bartkowiak、J Leszczynski
DOI:10.1016/s0022-2860(01)00457-4
日期:2001.5
Abstract The kinetics of thermally driven cis – trans isomerisation of asymmetrically substituted azobenzenes dissolved in solvents of various polarities was measured spectrophotometrically. The solvatochromic effect was observed in 4-nitro-4′-aminoazobenzene as well as in 4-nitro-4′methoxyazobenzene. The experiment has been supplemented with quantum-chemical calculations. The solvent effect was taken
Zr(OH)
<sub>4</sub>
‐Catalyzed Controllable Selective Oxidation of Anilines to Azoxybenzenes, Azobenzenes and Nitrosobenzenes
作者:Jiaheng Qin、Yu Long、Fangkun Sun、Pan‐Pan Zhou、Wei David Wang、Nan Luo、Jiantai Ma
DOI:10.1002/anie.202112907
日期:2022.1.10
Zr(OH)4 can catalyze the selective oxidation of anilines to azoxybenzenes, symmetric/unsymmetric azobenzenes and nitrosobenzenes for a wide range of substrates. Control experiments and DFT calculations reveal that the activation of H2O2 and O2 can be attributed to the bridging hydroxyl and terminal hydroxyl groups of Zr(OH)4, respectively.
Zr(OH) 4可以催化苯胺选择性氧化为偶氮苯、对称/不对称偶氮苯和亚硝基苯,适用于多种底物。对照实验和 DFT 计算表明,H 2 O 2和 O 2的活化可分别归因于 Zr(OH) 4的桥接羟基和末端羟基。
The selective synthesis of <i>N</i>-arylbenzene-1,2-diamines or 1-arylbenzimidazoles by irradiating 4-methoxy-4′-substituted-azobenzenes in different solvents
作者:Po-Yi Chen、Chi-Wei Hsu、Tong-Ing Ho、Jinn-Hsuan Ho
DOI:10.1039/d0ra10068d
日期:——
The solvent-controllable photoreaction of 4-methoxyazobenzenes to afford 1-aryl-1H-benzimidazoles or N-arylbenzene-1,2-diamines has been studied. The irradiation of 4-methoxyazobenzenes in DMF containing 0.5 M hydrochloric acid provided N 2-aryl-4-methoxybenzene-1,2-diamines as the major product, while irradiation in acetal containing 0.16 M hydrochloric acid led to 1-aryl-6-methoxy-2-methyl-1H-benzimidazoles
研究了 4-甲氧基偶氮苯的溶剂可控光反应得到 1-芳基-1H-苯并咪唑或 N-芳基苯-1,2-二胺。4-甲氧基偶氮苯在含有 0.5 M 盐酸的 DMF 中辐照产生 N 2-aryl-4-methoxybenzo-1,2-diamines 作为主要产物,而在含有 0.16 M 盐酸的乙缩醛中辐照产生 1-aryl-6-主要产品为甲氧基-2-甲基-1H-苯并咪唑。还讨论了解释选择性的可能反应机制。