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3"-chloro-4"-fluoro[1",4';1',4]terphenyl-1-carbaldehyde[ No CAS ]
Yield
Reaction Conditions
Operation in experiment
76%
With tetrakis(triphenylphosphine) palladium(0); sodium carbonate; In ethanol; water; toluene;Inert atmosphere; Reflux;
General procedure: To a solution of bromobiphenyl aldehyde 11 (390 mg, 1.5 mmol) and 4-fluoro phenyl boronic acid 12a (209.8 mg, 1.5 mmol) in 2 M aqueous sodium carbonate (2 mL) and toluene/ethanol (12:4 mL) is added a catalytic amount (0.4 mol %) of tetrakis-triphenylphosphine palladium, and the mixture was heated to reflux under argon atmosphere for 3-4 h. After completion of the reaction, the reaction mixture is cooled to room temperature and extracted with ethyl acetate (3 x 30 mL) and the organic phase was extracted with water and brine solution, dried over anhydrous Na2SO4 and the solvent was removed under reduced pressure to get the crude product. This crude product was further purified by column chromatography (10% ethyl acetate and hexane) to afford the pure terphenyl aldehydes (13a) as a white solid in 310 mg, 74% yield; mp: 135-136 C; 1H NMR (300 MHz, CDCl3): δ 7.12-7.19 (m, 2H), 7.57-7.73 (m, 6H), 7.78 (d, 2H, J = 8.3 Hz), 7.96 (d, 2H, J = 8.3 Hz), 10.06 (s, 1H); (ESI) MS: m/z 277 (M+H)+.
With 1,1'-bis-(diphenylphosphino)ferrocene; tetrakis(triphenylphosphine) palladium(0); sodium carbonate; In 1,4-dioxane; toluene; for 12h;Reflux;
General procedure: A mixture of 2-chloro-4-(trifluoromethyl)-benzonitrile (1.00 mmol), appropriate boronic acid (1.20 mmol)were dissolved in toluene/dioxane:2 N Na2CO3 (2:1:1) solution(6 ml). Tetrakis(triphenyl-phosphine)palladium(0) (0.10 mmol)and 1,10-Ferrocenediyl-bis(diphenylphosphine) (0.20 mmol) wasadded to the mixture and it was refluxed for 12 h. After cooleddown to ambient temperature, the reaction was filtered over celiteand extracted with EtOAc twice. The combined organic extractswere dried over MgSO4, filtered, and concentrated in vacuo. Theresidue was purified by flash column chromatography on silicagel using EtOAc/hexanes (1:10) eluant condition. (R-B(OH)2 =1-pentenyl boronic acid for 53, 1-cyclohexenylboronicacid for 54).
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