Benzylammonium chloride → 6-Acetamido-4-benzylamino2-methyl-quinoline hydrochloride

Participants

Reaction Conditions

Reaction Steps

A warm solution of benzylamine hydrochloride in water (1 mL) was added to a mixture of 6-acetamido-4-methoxy-2-methyl-quinoline (1.0 g, 4.3 mmol) in n-butanol (10 mL) after which complete solution occurred. The solution was stirred for 3 days at 100° C. under a nitrogen atmosphere, cooled, and the precipitated solid filtered, washed with ether, and dried to afford 1.0 g (75%) of 6-acetamido-4-benzylamino2-methyl-quinoline hydrochloride. A solution of this material (0.76 gm, 2.49 mmol) in 25% hydrochloric acid (12 mL) was heated for 5 hr at 90° C. and subsequently cooled. The precipitated solid was filtered, washed with water, dried at 50° C. under high vacuum for several hours to give 0.38 gm (58%) of 6-amino-4-benzylamino-2-methyl-quinoline. This material was dissolved in glacial acetic acid (3 mL) to which was added dropwise a solution of 2-chlorocinnamoyl chloride in glacial acetic acid over a 5 min period. The reaction mixture was stirred for 1 hr at room temperature and diluted with diethyl ether (25 mL). The solid was filtered, washed with ether, and dried by suction. It was then dissolved in a hot mixture of methanol (50 mL) and water (25 mL), cooled, and 5N sodium hydroxide added to give a yellow precipitate that was filtered, washed with water, and dried under high vacuum. Recrystallization from isopropanol afforded the title compound as pale yellow crystals; yield 0.32 g (52%), m.p. 253-4°, MS (FAB): m/z 428 (M+1).

Provenance & Evidence