Abstract Reaction of 5‐amino‐3‐methyl‐1‐phenylpyrazole ( 1a ) and 5‐amino‐3‐(4‐chlorophenyl)‐1 H ‐pyrazole ( 1b ) with dimedone ( 2 ) and p ‐susbstituted benzaldehydes 3 in ethanol, afforded in all cases tricyclic linear 4‐aryl‐7,7‐dimethyl‐4,7,8,9‐tetrahydro‐6 H ‐pyrazolo[3,4‐ b ]quinolin‐5‐ones ( 4a‐j ) in good yields. The linear structures and hence the regiospecificity of the reaction were established by nmr measurements.