“…They react with 4-benzylideneoxazol-5(4H)-one as enamines to form 3-amino-2,3,6,7tetrahydro-4H-pyrido[2,1-a]isoquinolin-4-one amides [19,20g] which can be oxidized to 3-aminopyrido[2,1-a]isoquinolin-4one derivatives in low and moderate yield. [19] Herein, we reported on a one-step synthesis of new 3amino-6,7-dihydro-4H-pyrido[2,1-a]isoquinolin-4-one derivatives based on easy available azlactones 5-11 and 3,4dihydroisoquinolines 18 a-e, 19 a, 20 a, 21 a, 22 a.…”