Synthesis of substituted quinolines by the electrophilic cyclization of n-(2-alkynyl)anilines
作者:Xiaoxia Zhang、Tuanli Yao、Marino A. Campo、Richard C. Larock
DOI:10.1016/j.tet.2009.12.012
日期:2010.2
A wide variety of substituted quinolines are readily synthesized under mild reaction conditions by the 6-endo-dig electrophilic cyclization of N-(2-alkynyl)anilines by ICl, I2, Br2, PhSeBr, and p-O2NC6H4SCl. The reaction affords 3-halogen-, selenium- and sulfur-containing quinolines in moderate to good yields in the presence of various functional groups. Analogous quinolines bearing a hydrogen in the
A visible-light-induced oxidative cyclization of <i>N</i>-propargylanilines with sulfinic acids to 3-sulfonated quinoline derivatives without external photocatalysts
作者:Yicheng Zhang、Wei Chen、Xueshun Jia、Lei Wang、Pinhua Li
DOI:10.1039/c8cc10235j
日期:——
A visible-light-induced oxidative cyclization of N-propargyl anilines with sulfinic acids was developed under external photocatalyst-free conditions. The reaction provides a straightforward route to 3-sulfonated quinoline derivatives with good functional group tolerance, excellent yields and high regio-selectivity.
Ag-Catalyzed or Ag/PPh<sub>3</sub>-Catalyzed Chemoselective Switchable Cascade Reactions of <i>N</i>-Propargyl Thiocarbamoyl Fluorides and Malonate Esters
作者:Zhongliang Cai、Junyi Zhou、Miao Yu、Liqin Jiang
DOI:10.1021/acs.orglett.1c03950
日期:2022.1.14
The divergent chemoselective synthesis of 2-methylene-2,3-dihydrothiazoles and 4-benzylidene pyrrolidine-2-thiones (most with E stereoselectivity) from N-propargyl thiocarbamoyl fluorides and malonate esters in moderate to excellent yields with a broad substrate scope and functional group tolerance has been accomplished. AgNTf2 catalyst at 60 °C in dichloroethane provided 4-benzylidene pyrrolidine-2-thiones
从N-炔丙基硫代氨基甲酰氟和丙二酸酯以中等至优异的产率,具有广泛的底物范围和功能性,不同的化学选择性合成 2-亚甲基-2,3-二氢噻唑和 4-亚苄基吡咯烷-2-硫酮(大多数具有 E 立体选择性)群体容忍度已经完成。AgNTf 2催化剂在 60 °C 下在二氯乙烷中提供 4-亚苄基吡咯烷-2-硫酮。AgOTf 催化剂和 PPh 3配体在回流乙腈中导致形成的 α,α-二酯硫代酰胺中间体的反应性发生完全转换,随后异构化得到 2-亚甲基-2,3-二氢噻唑。
Synthesis of 3-phosphinoylquinolines via a phosphinoylation–cyclization–aromatization process mediated by tert-butyl hydroperoxide
copper-catalyzed multicomponent coupling reaction of primary aromatic amines, rongalite, and alkynes for the direct synthesis of N-aryl propargylamines has been developed. This method could overcome the substrate limitation in A3 coupling reactions of primary aromatic amines, formaldehyde, and alkynes. Mechanisticstudies revealed that rongalite acts as not only the active C1 unit but also the accelerator