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。
Efficient Route to Highly Functionalized Chalcone-Based Pyranocoumarins via Iodine-Promoted Michael Addition Followed by Cyclization of 4-Hydroxycoumarins
作者:Naseem Ahmed、B. Venkata Babu
DOI:10.1080/00397911.2012.763099
日期:2013.11.17
Abstract Molecular iodine is used as an efficient promoter in the regioselective synthesis of highlyfunctionalized chalcone-based pyranocoumarin derivatives using 4-hydroxycoumarin in acetic acid solvent at 100 °C. Under optimized reaction conditions, our protocol (Michael addition followed by intermolecular cyclization) has tolerance for many functional groups and gave products in good to excellent
Intramolecular Aminolysis of 2′-Aminochalcone Epoxides Using InBr<sub>3</sub> or BiCl<sub>3</sub> as Efficient Catalysts
作者:Naseem Ahmed、Harendra Kumar、B. Venkata Babu
DOI:10.1080/00397911.2011.604571
日期:2013.1.1
and InBr3 catalyze the ring opening of 2′-aminochalcone epoxides followed by intramolecularaminolysis under mild conditions. The reactions proceed efficiently at room temperature to afford highly functionalized 2-aryl-3-hydroxy-2,3-dihydro-4-quinolones (aza-flavanones) in excellent yields (82–92%). Intermolecular aminolysis of 2′-aminochalcone epoxides with aniline derivatives failed under the same