Hydrochloric Acid → 2-[(S)-3-tert-Butoxycarbonyl-1-(4-ethoxycarbonyl-piperazine-1-carbonyl)-propylcarbamoyl]-quinoline-4-carboxylic acid

Participants

Reaction Steps

To a solution of 1.1 g of 2-[(S)-3-tert-Butoxycarbonyl-1-(4-ethoxycarbonyl-piperazine-1-carbonyl)-propylcarbamoyl]-quinoline-4-carboxylic acid ethyl ester in 10 ml of THF, 2 ml of a 1 M aqueous NaOH solution was added. After stirring for 5 h at RT additional 1 ml of a 1 M aqueous NaOH solution was added and allowed to stir upon completion of the reaction. Then, the reaction was acidified to pH 1 with diluted aqueous hydrochloric acid and extracted with DCM (3×100 ml). The combined organic phases were dried over MgSO4 and the solvents were removed under reduced pressure. The crude product was used in the next reaction step without further purification. Yield: 1.0 g.

Provenance & Evidence