Ethanol → HCID 136336861, compound

Participants

Reaction Conditions

Reaction Steps

To 95 mg of ethyl (3R)-1-{[7-methyl-4-oxo-1-(tetrahydro-2H-pyran-4-yl)-4,5-dihydro-1H-pyrazolo[4,3-c]quinolin-8-yl]carbonyl}piperidine-3-carboxylate were added 5 mL of ethanol and 200 μL of a 3 M aqueous sodium hydroxide solution, followed by stirring at 70° C. for 9 hours. The reaction mixture was cooled, and water and ethyl acetate were added thereto, and then the organic layer was separated. The aqueous layer was adjusted to about pH 4 with 1 mL of 1 M hydrochloric acid, then the solution was coevaporated with toluene. After forming a precipitate, f the precipitared powder was collected by filtration. The obtained powder was dried under reduced pressure to obtain 71 mg of (3R)-1-{[7-methyl-4-oxo-1-(tetrahydro-2H-pyran-4-yl)-4,5-dihydro-1H-pyrazolo[4,3-c]quinolin-8-yl]carbonyl}piperidine-3-carboxylic acid as white powder.

Provenance & Evidence