Preparation of quinolines

Details Preparation of quinolines Preparation of quinolines

C - Chemistry, Metallurgy

07

D

260/281.5

C07D 215/04 (2006.01) C07D 215/18 (2006.01)

Patent

CA 1314552

ABSTRACT OF THE DISCLOSURE: Quinolines of the formula (I): Image where R is C1-C5-alkyl, R1, R2 and R3 are each hydrogen or C1-C5-alkyl and X is hydrogen or halogen, with the proviso that R may furthermore be hydrogen if X is hydrogen, are prepared by reacting an aniline of the formula (II): Image (II) with an .alpha.,.beta.-unsaturated aldehyde or ketone of the formula (III): Image (III) in from about 70 to 85% strenght by weight sulfuric acid in the presence of a catalytic amount of iodine at elevated temperatures. This process is suitable for industrial purposes and gives quinoline in high yields.

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