Sodium hydride → (RS)-4-[2-cyano-5-(3-pyridylmethoxy)-phenoxy]-4-(2,3-dimethylphenyl)butanoic acid

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A solution of sodium (RS)-4-(2,3-dimethylphenyl)-4-hydroxybutanoate (1 g) is added to a stirred suspension of sodium hydride (0.5 g, 60% dispersion in mineral oil) in tetrahydrofuran (50 mL) under nitrogen. The mixture is stirred at room temperature for 3 hours when 2-fluoro-4-(3-pyridylmethoxy)benzonitrile (1 g) is added in one portion. The reaction mixture is heated at 55-60° C. for 18 hours and evaporated. The residue is dissolved in water (100 mL), the solution acidified to pH 1 with 1 N hydrochloric acid. The precipitated solid Is filtered, washed with water, ethyl acetate and ether, dried, and recrystallised from ethyl acetate to give (RS)-4-[2-cyano-5-(3-pyridylmethoxy)-phenoxy]-4-(2,3-dimethylphenyl)butanoic acid (0.85 g) as a white solid, m.p. 187-189° C. [Elemental analysis:- C,71.76; H,6.59; N,5.67%. Calculated:- C,72.10; H,6.73; N,5.81%]

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