Caffeine-H2SO4: a novel dual acidic catalyst for one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones

Caffeine-H2SO4: a novel dual acidic catalyst for one-pot preparation of... Res Chem Intermed (2017) 43:2491–2500 DOI 10.1007/s11164-016-2775-5 Caffeine-H SO : a novel dual acidic catalyst for one-pot 2 4 preparation of 2H-indazolo[2,1-b]phthalazinetriones 1 2 Seyyed Jafar Saghanezhad Soheil Sayyahi Received: 21 June 2016 / Accepted: 8 October 2016 / Published online: 25 October 2016 Springer Science+Business Media Dordrecht 2016 Abstract Caffeine-H SO was prepared as a novel dual acidic catalyst. The catalytic 2 4 activity of caffeine-H SO was evaluated in one-pot preparation of 2H-indazolo[2,1- 2 4 b]phthalazinetriones. The catalyst was also characterized by Fourier-transform infrared 1 13 (FT-IR) and H and C nuclear magnetic resonance (NMR) spectroscopy and ther- mogravimetric analysis (TGA). According to the obtained results including reaction time, yield, and recyclability, caffeine-H SO can be considered an efficient catalyst for 2 4 organic transformations. Graphical Abstract One-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones O H Caffeine-H SO N 2 4 NH Solvent-free, 100 C NH Keywords Caffeine-H SO  One-pot reaction  Solvent-free  2H-indazolo[2,1- 2 4 b]phthalazinetriones  Phthalhydrazide Introduction Recently, organic chemists have become more interested in multicomponent reactions (MCRs) due to their simplicity, high product yield, one-pot synthesis, and ecofriendly reaction conditions [1]. Due to the great potential of MCRs in designing & Seyyed Jafar Saghanezhad Research on Chemical Intermediates Springer Journals

Caffeine-H2SO4: a novel dual acidic catalyst for one-pot preparation of 2H-indazolo[2,1-b]phthalazinetriones

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Springer Netherlands
Copyright © 2016 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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