Synthesis of CF
<sub>2</sub>
H‐Containing Oxime Ethers Derivatives from ClCF
<sub>2</sub>
H,
<i>tert</i>
‐Butyl Nitrile and Indoles
作者:Xingxing Ma、Hua Huang、Jianke Su、Zhiyi Song、Tamaki Nakano、Qiuling Song
DOI:10.1002/cjoc.201900401
日期:2020.1
A new and intriguing methodology to access various O‐difluoromethylation oxime compounds from ClCF2H, TBN and indoles is developed under mild reaction conditions. This strategy can suppress N‐difluoromethylation of indoles successfully, in which there are two different active species (:CF2 and ·NO) while indoles are unprotected, featuring simple operation and radical involvement.
Gold(<scp>i</scp>)-catalyzed synthesis of 2-substituted indoles from 2-alkynylnitroarenes with diboron as reductant
作者:Wenqiang Fu、Kai Yang、Jinglong Chen、Qiuling Song
DOI:10.1039/c7ob01918a
日期:——
An efficient method for the synthesis of 2-substitutedindoles via a diboron/base promoted tandem reductive cyclization of o-alkynylnitroarene under Au catalysis conditions has been disclosed. This reaction is efficient and convenient, affording 2-substitutedindoles with broad functional groups tolerance and excellent yields.
Metal-free dearomative [5+2]/[2+2] cycloaddition of 1<i>H</i>-indoles with <i>ortho</i>-(trimethylsilyl)aryl triflates
作者:Xinyu Chen、Na Yang、Wen Zeng、Lei Wang、Pinhua Li、Hongji Li
DOI:10.1039/d1cc02550c
日期:——
Herein, we report a mild dearomative [5+2]/[2+2] cycloaddition of 1H-indoles with ortho-(trimethylsilyl)aryl triflates. The unique [5+2] cycloaddition enables the synthesis of a series of dibenzo[b,e]azepine derivatives in moderate to good yields. Increasing the steric hindrance at the C2-position of 1H-indoles leads to the [2+2] cycloaddition. Mechanistic investigations support that the reaction of
在此,我们报告了 1 H -吲哚与邻-(三甲基甲硅烷基)芳基三氟甲磺酸酯的温和脱芳基[5+2]/[2+2] 环加成反应。独特的 [5+2] 环加成可以合成一系列二苯并[ b , e ]氮杂衍生物,收率中等至良好。增加 1 H-吲哚的 C2 位的空间位阻导致 [2+2] 环加成。机理研究支持 1 H-吲哚与芳烃的反应经历 [2+2] 环加成步骤,然后扩环为 [5+2] 环加成产物。
Synthesis of Spiro[indole-3,5′-isoxazoles] with Anticancer Activity via a Formal [4 + 1]-Spirocyclization of Nitroalkenes to Indoles
作者:Alexander V. Aksenov、Dmitrii A. Aksenov、Nikolai A. Arutiunov、Nicolai A. Aksenov、Elena V. Aleksandrova、Zhenze Zhao、Liqin Du、Alexander Kornienko、Michael Rubin
DOI:10.1021/acs.joc.9b00808
日期:2019.6.7
An acid-assisted [4 + 1]-cycloaddition of indoles with nitrostyrenes affords 4′H-spiro[indole-3,5′-isoxazoles] in a diastereomerically pure form. Several of these spirocyclic molecules exhibit promising anticancer activity by reducing viability and inducingdifferentiation of neuroblastoma cells.
Ruthenium-Catalyzed Oxidative Dearomatization of Indoles for the Construction of C2-Quaternary Indolin-3-ones
作者:Xiao-Yu Zhou、Xia Chen、Liang-Guang Wang、Dan Yang、Jin-Hui Li
DOI:10.1055/s-0036-1591876
日期:2018.4
A ruthenium-catalyzed oxidative dearomatization of 2-alkyl- or 2-aryl-substituted indoles has been developed. When coupled with a cascade transformation, it provides a new system for the construction of indolin-3-ones bearing a C2-quaternary functionality. The reaction occurs readily with RuCl3·3H2O as a catalyst in acetonitrile. 2-(3-Indolyl)-substituted indolin-3-ones were obtained in medium to high