1‐Ethyl‐1,4‐dihydro‐4‐oxo‐7‐(pyridinyl)‐3‐quinolinecarboxylic acids. I. Synthesis of 3‐ and 4‐(3‐aminophenyl)pyridine intermediates

A series of substituted 3‐ and 4‐(3‐aminophenyl)pyridines has been prepared as intermediates for the synthesis of some 1‐alkyl‐1,4‐dihydro‐4‐oxo‐7‐pyridinyl‐3‐quinolinecarboxylic acids. The Hantzsch, Hauser and other pyridine syntheses were used. 4‐(3‐Aminophenyl)pyridine was prepared via 3‐(4‐pyridinyl)‐2‐cyclohexen‐1‐one using the Semmler‐Wolff reaction.