Heterocyclic Iodoniums for the Assembly of Oxygen-Bridged Polycyclic Heteroarenes with Water as the Oxygen Source
摘要:
A diverse set of novel heterocyclic iodoniums was synthesized for the first time. The reactions of these unique iodoniums with environmentally benign water as the oxygen source provided structurally complex oxygen-incorporated heteropolycycles that are essential motifs in natural products and biologically active compounds. The transformation only required low-cost copper acetate. Further derivatization of the obtained polycycles expanded the structural diversity, which is important in the building of chemical libraries for drug discovery.
Synthesis of heterocyclic-fused benzofurans via C–H functionalization of flavones and coumarins
作者:Youngtaek Moon、Yechan Kim、Hyerim Hong、Sungwoo Hong
DOI:10.1039/c3cc44456b
日期:——
An efficient method to effect C-O cyclization was developed via the C-H functionalization of chromones and coumarins, affording heterocyclic-fused benzofurans.
CuI mediated synthesis of heterocyclic flavone-benzofuran fused derivatives
作者:Iram Parveen、Naseem Ahmed
DOI:10.1016/j.tetlet.2017.04.101
日期:2017.6
An efficient synthetic method of heterocyclic flavone benzofuran fused derivatives is reported in good to excellent yield (75–90%) via Ullmann type coupling reaction. The protocol involves catalytic amount of CuI (10 mol%) and K2CO3 base for the intramolecular CO bond formation under mild reaction conditions.
据报道,通过Ullmann型偶联反应,杂环黄酮苯并呋喃稠合衍生物的一种有效合成方法具有良好至极好的收率(75-90%)。该方案涉及催化量的CuI(10 mol%)和K 2 CO 3碱,用于在温和的反应条件下形成分子内C O键。
Oxidative Cyclization Reactions Catalyzed by Designed Transition-Metal Complexes: A New Strategy for the Synthesis of Flavone, Quinolone, and Benzofuran Derivatives
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。