Redox-Neutral Rhodium(III)-Catalyzed Chemospecific and Regiospecific [4+1] Annulation between Indoles and Alkenes for the Synthesis of Functionalized Imidazo[1,5-<i>a</i>]indoles
作者:Fei Zhao、Jin Qiao、Yangbin Lu、Xiaoning Zhang、Long Dai、Siyu Liu、Hangcheng Ni、Xiuwen Jia、Xiaowei Wu、Shiyao Lu
DOI:10.1021/acs.joc.1c01256
日期:2021.8.6
unit, a redox-neutral rhodium(III)-catalyzed chemo- and regiospecific [4+1] annulation between indoles and alkenes for the synthesis of functionalized imidazo[1,5-a]indoles has been achieved. Internal alkenes employed here can fulfill an unusual [4+1] annulation rather than normal [4+2] annulation/C–H alkenylation. This method is characterized by excellent chemo- and regioselectivity, broad substrate scope
利用嵌入氧化功能/离去基团的内部烯烃作为稀有和非常规的单碳单元,氧化还原中性铑(III)催化的吲哚和烯烃之间的化学和区域特异性[4 + 1]环化,用于合成功能化咪唑并[1,5- a ]吲哚已经实现。这里使用的内部烯烃可以实现不寻常的 [4+1] 环化,而不是正常的 [4+2] 环化/C-H 烯基化。该方法的特点是优异的化学和区域选择性、广泛的底物范围、良好的官能团耐受性、良好的收率和氧化还原中性条件。