Activated fly ash-catalyzed synthesis of naphthyl-substituted cyclohexenone carboxylates, indazolonols, and nitro hydrazones in "dry media"

作者：Kanagarajan V; Ezhilarasi M R; Thanusu J; Gopalakrishnan M^*

来源：Green Chemistry Letters and Reviews, 2011, 4(4): 355-368.

DOI：10.1080/17518253.2011.573811

• naphthyl cyclohexenone carboxylates
• indazolonols
• nitrohydrazones
• environmentally benign
• dry media

An efficient and rapid synthesis of an array of naphthyl-substituted cyclohexenone carboxylates, indazolonols, and nitrohydrazones by using activated fly ash as catalyst in dry media is described. All the synthesized compounds were characterized by their melting point, elemental analysis, mass spectrometry, Fourier transform infrared, one-dimensional nuclear magnetic resonance (H-1 and D2O exchanged H-1 and C-13), and two-dimensional homonuclear correlation (HOMOCOR) and heteronuclear single quantum coherence (HSQC) spectroscopic data. Compared to classical conditions, this new protocol had the advantage of excellent yields, mild reaction conditions, simple workup, and short reaction times. Also, the catalyst could be reused up to four runs without any reduction in efficiency, making the process greener and environmentally benign.
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• 出版日期2011