Summary.
Silica sulfuric acid as an inexpensive and recyclable solid acid efficiently catalyzes the Fridedländer synthesis of quinolines through a condensation reaction of a 2-aminoaryl ketone with an activated α-CH acid compound under solvent-free conditions in high yields at 100°C.
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Shaabani, A., Soleimani, E. & Badri, Z. Silica Sulfuric Acid as an Inexpensive and Recyclable Solid Acid Catalyzed Efficient Synthesis of Quinolines. Monatsh. Chem. 137, 181–184 (2006). https://doi.org/10.1007/s00706-005-0413-9
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DOI: https://doi.org/10.1007/s00706-005-0413-9