反应详情

7.35 g (17 mmol) of N-benzyloxycarbonyl-3-[4-(1,4,7-trioxaoctyl)-phenyl]-alanine-methyl ester (Example a) is dissolved in 35 ml of tert-butyl methyl ether and mixed with 0.9 g (23.8 mmol) of sodium borohydride. At 5° C., 10 ml of methanol is added, and it is stirred for four hours under argon at constant temperature. Then, 1.5 ml of acetic acid, dissolved in 5 ml of tetrahydrofuran, is added, mixed with 5 ml of water and stirred for ten minutes at room temperature. The organic phase is separated, washed with water and dried on sodium sulfate. The drying agent is suctioned off, the filtrate is concentrated by evaporation and the residue is chromatographed for purification on silica gel.

1. additionis added
2. stirringstirred for ten minutes at room temperature
3. customThe organic phase is separated
4. washwashed with water
5. customdried on sodium sulfate
6. concentrationthe filtrate is concentrated by evaporation
7. customthe residue is chromatographed for purification on silica gel