Synthesis of N-substituted 1,4-dihydroquinolines from the Baylis–Hillman acetates via the successive SN2′–SNAr isomerization strategy

1,4-Dihydroquinolines 4a–e were prepared from the reaction of the Baylis–Hillman acetates of ortho-halobenzaldehydes and benzylamine or cyclohexylamine via the successive SN2′–SNAr isomerization strategy.