An efficient method for the preparation of 2 2 4 trisubstituted 1 2 dihydroquinolines using catalytic amount Bi OTf 3 as catalyst

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Substituted 1,2-dihydroquinolines have been synthesised from substituted anilines and methyl pyruvate using catalytic amounts of commercially available Bi(OTf)3 as a catalyst under microwave-assisted conditions. This method is simple, easy to work up, inexpensive, with a broad substrate scope and short reaction times. The reaction provides 1,2-dihydroquinolines (19 examples) in good yields (34-97% yields).