A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
Generation of Arylated Quinones by Iron-Catalyzed Oxidative Arylation of Phenols: Formal Synthesis of Phellodonin, Sarcodonin ε, Leucomelone and Betulinan A
Biologically and pharmaceutically relevant arylatedquinones (Quin‐Ar) have been synthesized via direct CH arylation of a variety of phenols using arylboronic acids. An inexpensive, environmentally friendly iron catalyst, ferric sulphate, Fe2(SO4)3, was employed in this operationally simple and efficient method.
Mn-Catalyzed 1,6-conjugate addition/aromatization of <i>para</i>-quinone methides
作者:Bobin Yang、Wei Yao、Xiao-Feng Xia、Dawei Wang
DOI:10.1039/c8ob01057a
日期:——
A series of ferrocenyl triazole ligands have been synthesized and characterized, which proved to be effective for the Mn-catalyzed 1,6-conjugate addition/aromatization of para-quinone methides.
Chemoproteomics of an Indole-Based Quinone Epoxide Identifies Druggable Vulnerabilities in Vancomycin-Resistant <i>Staphylococcus aureus</i>
作者:Amogh Kulkarni、Isha Soni、Dhanashree S. Kelkar、Allimuthu T. Dharmaraja、Rathinam K. Sankar、Gaurav Beniwal、Abinaya Rajendran、Sharvari Tamhankar、Sidharth Chopra、Siddhesh S. Kamat、Harinath Chakrapani
DOI:10.1021/acs.jmedchem.9b00774
日期:2019.7.25
The alarming global rise in fatalities from multidrug-resistant Staphylococcus aureus (S. aureus) infections has underscored a need to develop new therapies to address this epidemic. Chemoproteomics is valuable in identifying targets for new drugs in different human diseases including bacterial infections. Targeting functional cysteines is particularly attractive, as they serve critical catalytic functions
全球因多重耐药金黄色葡萄球菌 (S. aureus) 感染而导致的死亡人数惊人上升,这凸显了开发新疗法来应对这一流行病的必要性。化学蛋白质组学对于确定新药治疗不同人类疾病(包括细菌感染)的靶点很有价值。靶向功能性半胱氨酸特别有吸引力,因为它们具有使细菌存活的关键催化功能。在这里,我们报告了一种基于吲哚的醌环氧化物支架,具有独特的船状构象,允许空间控制调节硫醇反应性。我们广泛描述了一种先导化合物 (4a),该化合物可有效抑制临床衍生的耐万古霉素金黄色葡萄球菌。利用多种化学蛋白质组学平台,我们鉴定并生化验证了重要的转录因子是 4a 的有效靶标。有趣的是,每个鉴定的转录因子都有一个保守的催化半胱氨酸残基,它赋予这些细菌抗生素耐受性。因此,我们在此描述的化学工具和生物靶标在对抗金黄色葡萄球菌感染方面具有新的治疗范式。
Substituent Effects on Reactive Oxygen Species (ROS) Generation by Hydroquinones
作者:Allimuthu T. Dharmaraja、Charu Jain、Harinath Chakrapani
DOI:10.1021/jo501796z
日期:2014.10.3
hydroquinones and their ability to generate reactive oxygen species (ROS), we designed and synthesized a series of 6-aryl-2,3-dihydro-1,4-benzoquinones. These compounds equilibrate with the corresponding 6-aryl-1,4-dihydroxybenzenes in an organic medium; a linearfreeenergyrelationship analysis gave ρ = +2.37, suggesting that this equilibrium was sensitive to electroniceffects. The propensity of the compound