Neutral alumina catalysed synthesis of 3-nitro-1,2-dihydroquinolines and 3-nitrochromenes, under solvent-free conditions, via tandem process

It has been found that neutral alumina carries out the solvent-free reaction of 2-aminobenzaldehyde or salicylaldehyde over a range of nitroalkenes, under mild and convenient conditions, allowing the one pot synthesis of 3-nitro-1,2-dihydroquinolines and 3-nitrochromenes, respectively.

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