Chemo‐ and Regioselective Synthesis of Functionalized 1
<i>H</i>
‐imidazo[1,5‐
<i>a</i>
]indol‐3(2
<i>H</i>
)‐ones via a Redox‐Neutral Rhodium(III)‐Catalyzed [4+1] Annulation between Indoles and Alkynes
作者:Fei Zhao、Jing Chen、Jin Qiao、Yangbin Lu、Xiaoning Zhang、Hui Mao、Shiyao Lu、Xin Gong、Siyu Liu、Xiaowei Wu、Long Dai
DOI:10.1002/adsc.202100555
日期:2021.9.21
in transition-metal-catalyzed C−H annulations, herein, exploiting electron-deficient alkynes as unconventional C1 synthons, the chemo- and regiospecific synthesis of functionalized 1H-imidazo[1,5-a]indol-3(2H)-ones via a redox-neutral rhodium(III)-catalyzed [4+1] annulation of N-carbamoyl indoles has been achieved. This process is characterized by high chemo- and regioselectivity, broad substrate scope
炔烃通常在过渡金属催化的 C−H 环化中用作 C 2合成子,在此,利用缺电子炔烃作为非常规 C 1合成子,功能化 1 H-咪唑并[1,5- a ]的化学和区域特异性合成indol-3(2 H )-ones 通过氧化还原中性铑 (III) 催化的 [4+1] 环化N-氨基甲酰基吲哚已经实现。该工艺的特点是化学选择性和区域选择性高、底物范围广、官能团耐受性好、产率中等至高和氧化还原中性条件温和,从而为获取有价值的 1 H-咪唑并[1,5- a ]indol-3(2 H)-那些。