Boron trifluoride etherate → HCID 22762506, Verbindung

Reaktionsgleichung

[C:1]1([C:7]2[O:11][C:10]([C:12]([N:14]3[CH2:19][CH2:18][N:17]([C:20]4[CH:25]=[CH:24][CH:23]=[C:22]([C:26]([F:29])([F:28])[F:27])[CH:21]=4)[CH2:16][CH2:15]3)=O)=[CH:9][CH:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[BH4-].[Na+].B(F)(F)F.CCOCC>COCCOCCOC>[C:1]1([C:7]2[O:11][C:10]([CH2:12][N:14]3[CH2:15][CH2:16][N:17]([C:20]4[CH:25]=[CH:24][CH:23]=[C:22]([C:26]([F:27])([F:28])[F:29])[CH:21]=4)[CH2:18][CH2:19]3)=[CH:9][CH:8]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1

Komponenten

Versuchsvorschrift

1-(5-Phenyl-2-furoyl)-4-(3-trifluoromethylphenyl)-piperazine (6.0 g, 0.015 mole) and sodium borohydride (1.28 g, 0.034 mole) were stirred in diglyme (25 ml), under nitrogen, and redistilled boron trifluoride etherate (6 ml, 0.045 mole) in diglyme (20 ml) added dropwise with continuous stirring. The resultant clear solution was stirred at room temperature for 3 hours and then evaporated to remove diglyme. The residue was carefully diluted with water (100 ml), followed by 5NHCl (20 ml) and the mixture heated on a steam bath for 15 minutes. The mixture was cooled and made alkaline (4N NaOH) and extracted via diethyl ether. The dried ether extract (MgSO4) was evaporated to give an oil which failed to crystallise. The product was converted to the hydrochloride and then reconverted to the free base as in Example 40. The base was obtained as a mobile oil which on very strong cooling crystallised, m.p. 56° C.