Synthesis of 2-Aryl Acetophenones via Hydrobromination and Oxy-isomerization of (<i>o</i>-Arylethynyl)benzyl Alcohols
作者:Tzu-Hsuan Kuan、Duen-Ren Hou
DOI:10.1021/acs.joc.1c00294
日期:2021.5.7
Hydrobromination and oxy-isomerization of (o-arylethynyl)benzyl alcohols to yield brominated aryl ketones were achieved with bromotrimethylsilane. The substrate scope suggested that vinyl carbocations, stabilized by the conjugated aryl groups, are the reaction intermediates. 1H-Isochromene was also detected by 1H NMR, and an isolated 1H-isochromene was converted to the product when retreated with TMSBr
用溴代三甲基硅烷实现了(邻-芳基乙炔基)苄醇的氢溴化和氧异构化,生成溴化的芳基酮。底物范围表明,通过共轭芳基稳定的乙烯基碳阳离子是反应中间体。还通过1 H NMR检测到1 H-异戊二烯,当用TMSBr处理时,分离出的1 H-异戊二烯转化为产物。1 H-异戊二烯的形成等同于6-内挖-环化,并与在基本条件下的相应反应形成对比,在该条件下,以5-外-挖为主导。
AgSCF<sub>3</sub>/Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Promoted Trifluoromethylthiolation/Cyclization of <i>o</i>-Propargyl Arylazides/<i>o</i>-Alkynyl Benzylazides: Synthesis of SCF<sub>3</sub>-Substituted Quinolines and Isoquinolines
作者:Yi-Feng Qiu、Yue-Jie Niu、Xi Wei、Bao-Qian Cao、Xi-Cun Wang、Zheng-Jun Quan
DOI:10.1021/acs.joc.9b00181
日期:2019.4.5
A AgSCF3/Na2S2O8-promoted trifluoromethylthiolation/cascade cyclization of o-propargyl arylazides (or o-alkynyl benzylazides) triggered by a carbon carbon triple bond is reported. This strategy provides the synthesis of " valuable SCF3-substituted quinoline and isoquinoline systems via the construction of one C(sp(2)) SCF3 bond and one C-N bond within one process.