反应详情

温度

50 °C

Methyl 2-(3-tert-butoxycarbonylaminopropoxy)-4-methoxybenzoate (18.61 g, 54.8 mmol) was suspended in 3:1 tetrahydrofuran:water (100 mL), then solid LiOH monohydrate (5.06 g, 121 mmol) was added and the mixture was stirred at 50° C. for 24 hours. The mixture was diluted with water (350 mL) and washed with diethyl ether (2×250 mL). The aqueous layer was acidified to pH 1-2 with 1 N sodium bisulfate and the resulting slurry was extracted with EtOAc (2×300 mL). The combined EtOAc layers were washed with brine, dried, then concentrated in vacuo to give a solid white mass. Recrystallization from EtOAc provided 2-(3-tert-butoxycarbonylaminopropoxy)-4-methoxybenzoic acid as white needles (15.52 g, 87%).

1. washwashed with diethyl ether (2×250 mL)
2. extractionthe resulting slurry was extracted with EtOAc (2×300 mL)
3. washThe combined EtOAc layers were washed with brine
4. customdried
5. concentrationconcentrated in vacuo
6. customto give a solid white mass
7. customRecrystallization from EtOAc