为了开发非基于嘌呤的黄嘌呤氧化酶 (XO) 抑制剂,考虑到使用基于嘌呤的 XO 抑制剂报告的并发症,黄酮框架(一类具有 XO 抑制潜力)被用作先导结构进一步优化。由于喹诺酮类的生物活性潜力和类药物特性,通过基于结构的经典生物等排体,喹诺酮被用作色酮(黄酮中的双环单元)的等排体。这种类型的置换不会改变 XO 抑制所需的形状和结构特征,还提供了一些额外的相互作用位点,而不会丢失氢键和疏水性和芳烃-芳烃相互作用。在本研究中,合理设计了一系列 2-芳基/杂芳基-4-喹诺酮类(黄酮的氮杂类似物),合成并评估体外 XO 抑制活性。提出了一些关于结构-活性关系的概念,表明 2-芳环的性质对抑制活性的影响。最活跃的化合物 3l (IC50 = 6.24 µM) 与 XO 活性位点的氨基酸残基之间的重要相互作用是通过分子模型计算出来的。
Ruthenium-catalyzed, site-selective C–H activation: access to C5-substituted azaflavanone
作者:Manickam Bakthadoss、Tadiparthi Thirupathi Reddy、Duddu S. Sharada
DOI:10.1039/d0ra06580c
日期:——
A site-selective ruthenium-catalyzed keto group assisted C–H bond activation of 2-aryl tetrahydroquinoline (azaflavanone) derivatives has been achieved with a variety of alkenes for the first time. A wide range of substrates was utilized for the synthesis of a wide variety of alkenylated azaflavanones. This simple and efficient protocol provides the C5-substituted azaflavanone derivatives in high yields
CBr<sub>4</sub> catalyzed activation of α,β-unsaturated ketones
作者:Shyamal Kanti Bera、Rajat Rajiv Maharana、Kousik Samanta、Prasenjit Mal
DOI:10.1039/d2ob01223e
日期:——
the carbonyl group of α,β-unsaturatedketones. Carbon tetrabromide (CBr4) has been used as the sole reagent for the selective synthesis of flavanones and aza-flavanones from the corresponding 2′-hydroxy- and 2′-aminochalcones under metal-free and additive-free conditions. DFT calculations support the catalytic role of XB between the oxygen of chalcones and CBr4 in these reactions.
Mild and Efficient Silver(I) Triflate Catalyzed Synthesis of 2-Aryl-2,3-dihydroquinolin-4(1H)-ones, and Their Antioxidant Activities
作者:Yong Lee、Rameshwar Pandit、Kavita Sharma
DOI:10.1055/s-0035-1560322
日期:——
Biologically interesting 2-aryl-2,3-dihydroquinolin-4(1H)-ones were synthesized using a mild and efficient one-pot procedure starting from o-aminoacetophenones and aromatic aldehydes in the presence of silver(I) triflate. This synthetic protocol provides rapid access to a variety of 2-aryl-2,3-dihydroquinolin-4(1H)-ones. This technique has several advantages, such as the use of easily available starting materials, the efficiency of the catalyst, a simple operation, and tolerance of a wide range of functionality in the aldehydes. Screening of the synthesized compounds for their antioxidant properties revealed that two compounds (with EC50 = 15.42 M and 15.16 M) exhibit a potent free-radical scavenging ability towards TEAC free radicals compared to the standard, Trolox.