[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([CH2:9][C:10](OCC)=O)=[CH:5][CH:4]=1.[Br:15][C:16]1[CH:21]=C[C:19]([C:22]#[N:23])=[C:18](F)[CH:17]=1.CC(C)([O-])C.[K+].[OH-].[Na+]>CN1CCCC1=O.CO>[Br:15][C:16]1[CH:17]=[CH:18][C:19]([C:22]#[N:23])=[C:10]([CH2:9][C:6]2[CH:5]=[CH:4][C:3]([O:2][CH3:1])=[CH:8][CH:7]=2)[CH:21]=1
A mixture of 25 g of ethyl (4-methoxy-phenyl)-acetate, 27.4 g of 1-bromo-4-cyano-3-fluoro-benzene and 20 mL of N-methyl-pyrrolidin-2-one is slowly added to 31.4 g of potassium tert butoxide in 130 mL of N-methyl-pyrrolidin-2-one keeping the temperature below 10° C. After stirring for 1 hour at room temperature, 100 mL of methanol and 137 mL of 1 M aqueous sodium hydroxide are added and the mixture is stirred overnight at room temperature. The methanol fraction is evaporated, the residue is basified with 1 M aqueous sodium hydroxide and extracted with tert butyl-methyl ether. The aqueous phase is acidified with 4 M hydrochloric acid and extracted with ethyl acetate several times. The combined ethyl acetate extracts are evaporated and the residue together with 120 mL of N,N-dimethyl formamide and 24.9 g of potassium carbonate heated at 100° C. for 1 hour. The reaction mixture is diluted with aqueous sodium bicarbonate and extracted several times with ethyl acetate. The combined extracts are evaporated and the residue crystallized from methanol.
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