Oxidative Cyclization Reactions Catalyzed by Designed Transition-Metal Complexes: A New Strategy for the Synthesis of Flavone, Quinolone, and Benzofuran Derivatives
作者:Kaushik Ghosh、Naseem Ahmed、Apurva Singh、Sain Singh
DOI:10.1055/s-0042-1751489
日期:2023.12
An efficient and convenient synthetic protocol is reported for the synthesis of 2-phenyl-4H-chromen-4-one, 2-phenylquinolin-4(1H)-one, and 11H-benzofuro[3,2-b]chromen-11-one derivatives from 2′-hydroxychalcones, 2′-aminochalcones, and 3-hydroxyflavones, respectively, using transition-metal catalysts and TEMPO as an oxidizing agent. This catalytic heterocyclization approach involves in situ free-radical
报道了一种有效且方便的合成方案,用于合成 2-苯基-4 H -chromen-4-one、2-苯基喹啉-4(1 H )-one 和 11 H-苯并呋喃[3,2- b ]chromen使用过渡金属催化剂和 TEMPO 作为氧化剂,分别从 2'-羟基查尔酮、2'-氨基查尔酮和 3-羟基黄酮生成 -11-酮衍生物。这种催化杂环化方法涉及原位自由基生成,通过 EPR 光谱研究和 H 2 O 2检测到苯氧基自由基。成立了。该方法具有许多优点,例如原子经济性高、合成危险性小、溶剂和助剂良性、易于操作、底物范围更广以及良好至优异的产物收率。