A Method for the Synthesis of Substituted Quinolines via Electrophilic Cyclization of 1-Azido-2-(2-propynyl)benzene
作者:Zhibao Huo、Ilya D. Gridnev、Yoshinori Yamamoto
DOI:10.1021/jo902603v
日期:2010.2.19
A new and efficient strategy for the synthesis of substituted quinolines viaelectrophilic cyclization is developed. The intramolecular cyclization of 1-azido-2-(2-propynyl)benzene 1 proceeds smoothly in the presence of electrophilic reagents (I2, Br2, ICl, NBS, NIS, and HNTf2) in CH3NO2 at room temperature or in the presence of catalytic amounts of AuCl3/AgNTf2 in THF at 100 °C to afford the corresponding
The arylation of C–H bonds to generate heteroaryl–aryl (Het–Ar) and arylated quinone (Quin–Ar) compounds has received great attention to achieve sustainable goals in synthetic chemistry. Despite significant advances, arylation of a broad range of Het–Ar and Quin–Ar derivatives remains a challenging task. Herein, a variety of heterocycles are arylated by using arylboronic acids in the presence of catalytic
A concise and environmentally friendly protocol was developed for the synthesis of 6-phenylbenzo[h]quinolines. 6-Phenylbenzo[h]quinolines were obtained in good yields via irradiation of (E)-2-phenyl-3-styrylpyridines with a 254 nm UV light (64 W) in EtOH under an argon atmosphere in the presence of TFA. The reaction is a dehydrogenative annulation reaction that proceeds through 6π-electrocyclization
开发了一种用于合成 6-苯基苯并[ h ]喹啉的简明且环保的方案。在存在 TFA 的情况下,在 EtOH 中用 254 nm 紫外光 (64 W)照射 ( E )-2-苯基-3-苯乙烯基吡啶,以良好的收率获得6-苯基苯并[ h ]喹啉。该反应是一个脱氢环化反应,通过 6π-电环化、[1,5]-H 位移、1,3-烯胺互变异构化和氢分子的消除得到 6-苯基苯并[ h ]喹啉。所描述的协议不仅避免了过渡金属催化剂和氧化剂的使用, 而且还具有原子效率高和反应条件温和的优点。
Synthesis of Benzoacridines and Benzophenanthridines by Regioselective Pd-Catalyzed Cross-Coupling Reactions Followed by Acid-Mediated Cycloisomerizations
Various benzoacridines and benzophenanthridines have been synthesized by Brønsted acid mediated cycloisomerisation as the key step. The optical and electrochemical properties have been studied by UV/Vis and emission spectroscopy as well as CV measurements. Obtained results have been verified by DFT calculations.