Ruthenium(II)-Catalyzed Redox-Neutral [3+2] Annulation of Indoles with Internal Alkynes via C–H Bond Activation: Accessing a Pyrroloindolone Scaffold
作者:Yanan Xie、Xiaowei Wu、Chunpu Li、Jiang Wang、Jian Li、Hong Liu
DOI:10.1021/acs.joc.7b00575
日期:2017.5.19
Ru(II)-catalyzed redox-neutral [3+2] annulation reactions of N-ethoxycarbamoyl indoles and internal alkynes via C–H bond activation are reported. This method features a broad internal alkyne scope, including various aryl/alkyl-, alkyl/alkyl-, and diaryl-substituted alkynes, good to excellent regioselectivity, diverse functional group tolerance, and mild reaction conditions. The N-ethoxycarbamoyl directing
据报道,Ru(II)通过CH键活化N-乙氧基氨基甲酰基吲哚和内部炔烃的氧化还原中性[3 + 2]环化反应。该方法具有广泛的内部炔烃范围,包括各种芳基/烷基-,烷基/烷基-和二芳基-取代的炔烃,具有良好的区域选择性,优异的官能团耐受性和温和的反应条件。所述Ñ -ethoxycarbamoyl定向取代基,温度,CsOAc,和钌催化剂被证明是转化率和高区域选择性至关重要。此外,进行了初步的机械实验,并提出了可能的机制。