Brønsted acidic ionic liquid-catalyzed tandem reaction: an efficient and sustainable approach towards the regioselective synthesis and molecular docking studies of 4-hydroxycoumarin-substituted indoles bearing lower <i>E</i>-factors
作者:Satyajit Samanta、Rana Chatterjee、Subhankar Sarkar、Satyajit Pal、Anindita Mukherjee、Ilya I. Butorin、Olga A. Konovalova、Tathagata Choudhuri、Koushik Chakraborty、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1039/d2ob01431a
日期:——
coumarin-functionalized indole derivatives via a tandem cyclization reaction of aniline and phenylglyoxal monohydrate. This reaction possibly proceeds through imine formation/nucleophilic addition/cyclization. In addition, this method shows lower E-factors. A clean reaction, easily accessible reactants, metal-free and environmentally friendly reaction conditions, and reusability of the catalyst are the notable
Reductive Alkylation of α-Keto Imines Catalyzed by PTSA/FeCl<sub>3</sub>: Synthesis of Indoles and 2,3′-Biindoles
作者:P. Seetham Naidu、Sinki Kolita、Meenakshi Sharma、Pulak J. Bhuyan
DOI:10.1021/acs.joc.5b00533
日期:2015.6.19
was developed. In the reaction protocol, three components were used in one pot and products were obtained in high yield in an easy workup procedure. The reaction occurred via initial reductivealkylation of α-keto imines, followed by a cyclization process in the presence of PTSA/FeCl3 as catalyst.
Studies on Isocyanides and RelatedCompounds: A Facile Synthesis of 1,6-Dihydro-6-oxopyrazine-2-carboxylicAcid Derivatives via Ugi Four-Component Condensation
The Ugifour-componentcondensation (U-4CC) between arylglyoxals 7, amines 6, benzoylformic acid (4) and isocyanides 5 afforded the expected products 8 which were cyclized in a 5+1 fashion with ammonium acetate to give I,N-disubstituted 4-aryl-1,6-dihydro-6-oxo-5-phenylpyrazine-2-carboxamides 9 in good yields. Evidence for the assigned structures 9 was provided by 1 3 C NMR spectra and X-ray analysis
芳基乙二醛 7、胺 6、苯甲酰甲酸 (4) 和异氰化物 5 之间的 Ugi 四组分缩合 (U-4CC) 得到预期的产物 8,其以 5+1 方式与乙酸铵环化得到 I,N-二取代4-aryl-1,6-dihydro-6-oxo-5-phenylpyrazine-2-carboxamides 9 收率良好。指定结构 9 的证据由 1 3 C NMR 光谱和 9a 的 X 射线分析提供。