反应详情

LiOH (46.4 mg, 3.782 mmol) was added to a stirred solution of 4-[3-(4-methyl-pyridin-3-yl)-2-oxo-imidazolidin-1-yl]-benzoic acid methyl ester (230 mg, 0.7387 mmol) in (3:2:1) THF (10 mL, water (6 mL) and MeOH (3 mL). The reaction mixture was stirred at room temperature for 4 hours. The reaction was monitored by TLC (10% MeOH in DCM). The reaction mixture was concentrated under reduced pressure, followed by the addition of ice water and neutralized with 1N HCl till a pH of about 2 was attained. The precipitate was collected and dried under reduced pressure to afford 210 mg of 4-[3-(4-Methyl-pyridin-3-yl)-2-oxo-imidazolidin-1-yl]-benzoic acid (95% yield).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionfollowed by the addition of ice water and neutralized with 1N HCl till a pH of about 2
3. customThe precipitate was collected
4. customdried under reduced pressure