Sodium borohydride → HCID 13052170, Verbindung
Reaktionsgleichung
[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:27]=[CH:28][C:29]=1[O:30][CH3:31])[C:6]([CH:8]([N:10]1[CH2:15][CH2:14][CH:13]([N:16]2[CH2:21][C:20]3[CH:22]=[CH:23][CH:24]=[CH:25][C:19]=3[O:18][C:17]2=[O:26])[CH2:12][CH2:11]1)[CH3:9])=[O:7].[BH4-].[Na+]>CO>[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH:6]([OH:7])[CH:8]([N:10]2[CH2:11][CH2:12][CH:13]([N:16]3[CH2:21][C:20]4[CH:22]=[CH:23][CH:24]=[CH:25][C:19]=4[O:18][C:17]3=[O:26])[CH2:14][CH2:15]2)[CH3:9])[CH:27]=[CH:28][C:29]=1[O:30][CH3:31]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
In this example, 2.8 g of 1-[1-(3,4-dimethoxybenzoyl)-ethyl]-4-(2-oxo-3,4-dihydro-2H-1,3-benzoxazin-3-yl)-piperidine obtained in Example 5 is mixed with 150 ml of methanol. While the mixture is stirred at 0° to 10° C., 2 g of sodium borohydride is added thereto over a period of one hour. The mixture is further stirred for 3 hours at the same temperature and then stirred overnight at room temperature. The white crystals deposited are separated by filtration, washed with methanol and water and dried to obtain 1.90 g of a crude product. The crude product is recrystallized from ethanol to obtain 1.67 g of the desired product.