反应详情

To a stirred suspension of [3-(tritylamino)phenyl]acetic acid (30.00 g, 76.24 mmol) in THF (126 mL) under nitrogen at 0° C. was added dropwise a solution of borane dimethyl sulfide complex in THF (2 M, 76.2 mL, 152 mmol) over a period of 45 min while maintaining the temperature at ≦1.8° C. The resulting slightly yellow homogeneous solution was stirred at room temperature for 18 h. Saturated aqueous sodium bicarbonate solution (˜300 mL) was added slowly (strongly effervescent upon initial addition) and the resulting mixture was stirred at room temperature overnight. The mixture was extracted with EtOAc (2ט330 mL) and the combined organic layers were dried over sodium sulfate, filtered, and concentrated under reduced pressure to give the title compound (25.6 g, 86% yield) as a white solid.

1. temperaturewhile maintaining the temperature at ≦1.8° C
2. additionaddition) and the resulting mixture
3. stirringwas stirred at room temperature overnight
4. extractionThe mixture was extracted with EtOAc (2ט330 mL)
5. dry with materialthe combined organic layers were dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure