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One-pot, three-component synthesis of polyfunctionalized benzo[h]pyrazolo[3,4-b][1,6]naphthyridine and benzo[g]pyrazolo[3,4-b]quinoline derivatives in the presence of silver nanoparticles (AgNPs)
An efficient and straightforward protocol for one-pot, three-component reaction of aryl glyoxal monohydrates1a-h, 5-amino-1-aryl-3-methylpyrazoles2a,band 4-hydroxyquinoline-2(1H)-one (3) or 2-hydroxy-1,4-naphthoquinone (4) using silver nanoparticles (AgNPs) as a high performance nanocatalyst in H2O/EtOH at 60 degrees C afforded the corresponding polyfunctionalized benzo[h]pyrazolo[3,4-b][1,6]naphthyridines5a-hand benzo[g]pyrazolo[3,4-b]quinolines6a-i, respectively. Excellent catalytic activity, high yields, employing green media and green nanocatalyst, cost-effective and simple procedure are some notable advantages of using AgNPs as a noble metal nanocatalyst in this synthetic strategy. The structures of fused heterocycles were confirmed by their Fourier transform infrared, proton nuclear magnetic resonance (H-1-NMR), and(13)C-NMR spectral data and microanalysis.
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Reference:
1,8-Naphthyridine – Wikipedia,
,1,8-Naphthyridine | C8H6N2 – PubChem