c 5 ch 2 ch 3 ppm a solution of 233 mg 1 34 mmol of trans cinnamaldehyde n n dimethylhydrazone was added to a solution of 4 methyl 1h quinoline 2 5 8 trione 127 mg 0 67 mmol in dry chloroform 120 ml the reaction was stirred under nitrogen at room temperature for 3 days with periodical additions of solvent 100 ml each 12 h a further amount of 166 mg 0 61 mmol of the hydrazone was added and the reaction was refluxed for 24 h and evaporated to dryness and the residue was purified by silica gel chromatography using a gradient elution starting with neat dichloromethane to dichloromethane ethyl acetate 7 3 to yield 204 mg of the starting diene 72 mg 35 of 2 and 160 mg of 6 dimethylamino 4 methyl 1h quinoline 2 5 8 trione ir kbr 3400 nh 1660 1655 1600 c u2550 o cm 1 1 h nmr 300 mhz d 5 pyridine u03b4 10 40 d 1h j 4 0 hz n8 h 7 69 dd 2h j 2 39 3 39 8 0 hz j 2 39 4 39 1 0 hz c 2 39 h c 6 39 h 7 41 t 2h j 8 0 hz c 3 39 h c 5 39 h 7 25 tt j 4 39 3 39 7 8 hz j 4 39 2 39 1 1 hz c 4 39 h 6 70 m 2h c 3 h c 7 h 5 17 m 1h c 6 h 5 11 d 1h j 5 0 hz c 5 h 2 46 d 3h.