Potassium Cyanide → 4-Cyanoacetyl-2',4'-difluorobiphenyl
Reaktionsgleichung
[C:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:15]=[CH:14][C:13]([F:16])=[CH:12][C:11]=2[F:17])=[CH:6][CH:5]=1)(=[O:3])[CH3:2].BrCC(C1C=CC(C2C=CC(F)=CC=2F)=CC=1)=O.[C-:36]#[N:37].[K+]>>[C:36]([CH2:2][C:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:15]=[CH:14][C:13]([F:16])=[CH:12][C:11]=2[F:17])=[CH:6][CH:5]=1)=[O:3])#[N:37]Komponenten
4
Versuchsvorschrift
Grignard reagent obtained from 14.2 g. of methyl iodide and 2.4 g. of magnesium in 100 ml. of THF is added dropwise to a solution of 30.4 g. of 3-(2',4'-difluoro-4-biphenylyl)-3-oxopropionic acid ethyl ester, obtained by brominating 4-acetyl-2',4'-difluorobiphenyl to 4-bromoacetyl-2',4'-difluorobiphenyl, reacting this with KCN to give 4-cyanoacetyl-2',4'-difluorobiphenyl, hydrolyzing the latter and esterifying the reaction product, in 200 ml. of THF. When the addition is complete, the mixture is heated and stirred for 2 hours more on a water bath and cooled. The resulting alcoholate is hydrolyzed with ice and saturated NH4Cl solution. The ether phase is dried and evaporated to give 3-(2',4'-difluoro-4-biphenylyl)-3-hydroxybutyric acid ethyl ester, m.p. 96°-97°.