Hydrochloric Acid → 8-(4-aminomethylphenyl)-1-cyclopropyl-9-methyl-4-oxo-4H-quinolizine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

350 mg of ethyl 8-chloro-1-cyclopropyl-9-methyl-4-oxo-4H-quinolizine-3-carboxylate was dissolved in 3.5 ml of toluene. 1.8 ml of ethanol, 1.8 ml of 2 M aqueous sodium carbonate solution, 235 mg of 4-aminomethylphenylboronic acid hydrochloride and 40 mg of bis(triphenylphosphine)palladium (II) chloride were added to the obtained solution, and they were heated under reflux in argon atmosphere for 6 hours. The reaction mixture was acidified with 1 N hydrochloric acid. After washing the aqueous layer with ethyl acetate, it was taken and then concentrated under reduced pressure. 2 ml of methanol and 1 ml of 1 N sodium hydroxide were added to the obtained residue, and they were stirred at 50° C. for 1 hour. The reaction mixture was concentrated under reduced pressure, and the residue was dissolved in 10 ml of water and then neutralized with 1 N hydrochloric acid. The crystals thus formed were taken by the filtration to obtain 241 mg of 8-(4-aminomethylphenyl)-1-cyclopropyl-9-methyl-4-oxo-4H-quinolizine-3-carboxylic acid.

Provenance & Evidence