Abstract
Background: Among the nitrogen heterocycles, quinolones and their derivatives represent the most important class of organic scaffolds that attract the interest of both medicinal and synthetic chemists. And these molecules possess a large number of biological and pharmacological properties. Here, we have synthesized 3-(1-(1H-indol-3-yl)-3-oxo-3-phenylpropyl)-4-hydroxy-1-methylquinolin- 2(1H)-ones 5 in presence of L-proline through the intermediacy of 4-hydroxy-1-methyl-3-(3-oxo-3- phenylprop-1-en-1-yl)quinolin-2(1H)-one 3.
Methods: All the compounds 5(aa-ce) have been synthesized in step-wise, one-pot with sequential addition and one-pot process with all substrates present from the outset methods under green conditions. The structure of the product was established based on its spectral properties IR, 1H- NMR, 13C-NMR and Mass.
Results: In this work we describe the synthesis of 3-(1-(1H-indol-3-yl)-3-oxo-3-phenylpropyl)-4- hydroxy-1-methylquinolin-2(1H)-ones 5(aa-ce) by condensation of 4-hydroxy-1-methyl-2-oxo-1,2- dihydroquinoline-3-carbaldehyde 1, with acetophenone 2(a-c) and indole 4(a-e) in the presence of L-proline and water.
Conclusion: We have synthesized new series of indole substituted N-heterocyclic chalcones via Friedel-Crafts alkylation under green condition. The syntheses are water mediated and eco-friendly involving easy workup: moreover they gave high yields without the need of costly catalyst and column chromatography.
Keywords: Chalcones, Friedel-Crafts alkylation, L-proline, orixiarine, sodium dodecyl sulfate (SDS).
Graphical Abstract
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