Sodium borohydride → Priralfinamide
反応式
[F:1][C:2]1[CH:22]=[CH:21][CH:20]=[CH:19][C:3]=1[CH2:4][O:5][C:6]1[CH:18]=[CH:17][C:9]([CH:10]=[N:11][C@@H:12]([CH3:16])[C:13]([NH2:15])=[O:14])=[CH:8][CH:7]=1.[BH4-].[Na+]>CO>[F:1][C:2]1[CH:22]=[CH:21][CH:20]=[CH:19][C:3]=1[CH2:4][O:5][C:6]1[CH:7]=[CH:8][C:9]([CH2:10][NH:11][C@@H:12]([CH3:16])[C:13]([NH2:15])=[O:14])=[CH:17][CH:18]=1参加物
4
反応条件
- 温度
- 3.5 °C
実験手順
A mixture of (S)-2-[4-(2-fluorobenzyloxy)benzylideneamino]propanamide (IIIb) prepared as described above (30 g) and methanol (180 mL) is cooled under stirring to 2-5° C. Sodium borohydride (3.8 g) is added in eighteen small portions in 90 min to the previously prepared cold mixture keeping the temperature below 5° C. The mixture is then stirred for additional 10 min at 5° C. The reaction mixture is concentrated under vacuum and worked up as described in Example 2 to provide 28.75 g (95% yield) of (S)-2-[4-(2-fluorobenzyloxy)benzylamino]propanamide (ralfinamide, Ib) with a HPLC purity of 99.5 (area %) determined according to the method of Example 25A and a C,O-dialkylated (S)-2-[3-(2-fluorobenzyl)-4-(2-fluorobenzyloxy)-benzylamino]propanamide content less than 0.005% by weight determined by HPLC, according to the method of Example 25B.