Potassium Phosphate, Tribasic → 3-Chloro-5-(4-phenoxyphenyl)isonicotinonitrile

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A mixture of 3,5-dichloroisonicotinonitrile (10.00 g, 57.8 mmol), 4-phenoxyphenylboronic acid (12.37 g, 57.8 mmol), palladium(II) acetate (0.389 g, 1.734 mmol), potassium phosphate (30.7 g, 145 mmol) and 1,1′-bis(di-t-butylphosphino)ferrocene (0.833 g, 1.734 mmol) was pumped and backfilled with nitrogen 3 times. Dioxane (200 mL) was added. The reaction vial was again pumped and backfilled with nitrogen 3 times, sealed and heated to gentle reflux for 20 h. The dioxane solvent was evaporated in vacuo. The residue was diluted with water (150 mL) and brine (150 mL) and extracted with ethyl acetate (3×100 mL). The combined extracts were washed with brine (25 mL), dried (MgSO4) and concentrated. Silica gel chromatography, eluting with 0-15% ethyl acetate in dichloromethane-hexanes (1:2), gave 3-chloro-5-(4-phenoxyphenyl)isonicotinonitrile as tan liquid (9.71 g, 55% yield). 1H NMR (500 CDCl3) δ ppm 8.74 (1H, s), 8.70 (1H, s), 7.50-7.59 (2H, m), 7.35-7.46 (2H, m), 7.20 (1H, t, J=7.42 Hz), 7.06-7.16 (4H, m); MS (ES+) m/z: 307 (M+H); LC retention time: 4.298 min (analytical HPLC Method A).

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