1, 4‐Dihydropyridine derivatives have been obtained by MICHAEL condensation with cinnamylidene anilines 1 or N‐p‐tolyl‐chalcone imine 5. With ethyl acetoacetate 1 and 5 yield 1‐aryl‐2‐methyl‐3‐ethoxycarbonyl‐4‐phenyl‐1, 4‐dihydropyridines 2 and 6, with diethyl malonate 1‐aryl‐3‐ethoxycarbonyl‐2‐oxo‐4‐phenyl‐1, 2, 3, 4‐tetrahydropyridines 7 and 8, and with acetyl acetone 1‐aryl‐2‐methyl‐3‐acetyl‐4‐phenyl‐1, 4‐dihydropyridines 9 and 10.
Umsetzung der Schiffschen Basen (I) und (VII) mit Maleinsäureanhydrid (II) in siedendem Xylol liefert in 60‐65%iger Ausbeute die Tetrahydropyridin‐ Derivate (III) bzw. (VIII).
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