Pentamethyldiethylenetriamine → 4-Fluoro-3-[(3-fluorophenyl)-hydroxymethyl)-5-methoxybenzonitrile

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Reaction Steps

To a solution of 15.0 g of 4-fluoro-3-methoxybenzonitrile and 21.8 ml of N,N,N′,N′,N″-pentamethyldiethylenetriamine in 300 ml tetrahydrofuran was added 65.5 ml of a 1.59 M solution of n-butyllithium in hexane at −78° C. in an atmosphere of nitrogen gas, followed by stirring at the same temperature for 1 hour. At the same temperature, 10.5 ml of 3-fluorobenzaldehyde was added dropwise, followed by stirring at the same temperature for 1 hour. Then, water was added and the mixture was extracted with diethyl ether. The organic layer was washed with saturated aqueous ammonium chloride solution and brine, dried over anhydrous magnesium sulfate and the solvent was evaporated. The crude product was purified and separated by silica gel column chromatography (ethyl acetate:n-hexane=1:10 to 1:3), to give 7.1 g of the title compound as a colorless oil.

Provenance & Evidence