Water → HCID 23019633, compound

Participants

Reaction Conditions

Reaction Steps

12 mg of ethyl 1-cyclopropyl-9-methyl-4-oxo-8-{4-[2-(tetrahydro-pyran-2-yloxy)-ethylamino]phenyl}-4H-quinolizine-3-carboxylate (Example 21) was dissolved in 1 ml of ethanol. 1 ml of water and 10 mg of pyridinium p-toluenesulfonate were added to the obtained solution, and they were stirred at 50° C. for 9 hours. The reaction mixture was poured into an aqueous sodium hydrogencarbonate solution. After extracting with chloroform, the organic layer was dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The obtained residue was purified by the silica gel column chromatography (eluent: chloroform/methanol=19/1). 1 ml of ethanol and 1 ml of 1 N sodium hydroxide were added to the obtained crystals, and they were stirred at 50° C. for 2 hours. The reaction mixture was concentrated under reduced pressure and then dissolved in 5 ml of water. The obtained solution was neutralized with 1 N hydrochloric acid. The crystals thus formed were taken by the filtration to obtain 1 mg of 1-cyclopropyl-8-[4-(2-hydroxyethylamino)phenyl]-9-methyl-4-oxo-4H-quinolizine-3-carboxylic acid.

Provenance & Evidence