反应详情

温度

60 °C

To a solution of 44.0 g (140 mmol) of ethyl (3-{[(benzyloxy)carbonyl]amino}phenyl)acetate) (from Step A) in THF, ethanol, and water (1:1:1, 1500 mL) was added solid LiOH (16.8 g, 700 mmol) and the resulting solution heated to 60° C. via oil bath for 3 h. The mixture was cooled to room temperature overnight and then 40 mL of concentrate HCl was slowly added, keeping the temperature below 25° C., until the solution was about pH of 2-3. Extract with ethyl acetate (3×750 mL) and then combine and wash organics with water and then brine. Dry organics over sodium sulfate, filter and concentrate under vacuum. The title compound (24.7 g, 87%) was used for the next step reaction without further purification. LC-MS: m/z (ES) 286 (MH)+, 308 (MNa)+.

1. temperatureThe mixture was cooled to room temperature overnight
2. customthe temperature below 25° C.
3. extractionExtract with ethyl acetate (3×750 mL)
4. washwash organics with water
5. filtrationDry organics over sodium sulfate, filter
6. concentrationconcentrate under vacuum
7. customThe title compound (24.7 g, 87%) was used for the next step reaction without further purification