Abstract
Caffeine-H2SO4 was prepared as a novel dual acidic catalyst. The catalytic activity of caffeine-H2SO4 was evaluated in one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones. The catalyst was also characterized by Fourier-transform infrared (FT-IR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy and thermogravimetric analysis (TGA). According to the obtained results including reaction time, yield, and recyclability, caffeine-H2SO4 can be considered an efficient catalyst for organic transformations. One-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones
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