Ethanol → N-(isobutoxycarbonyl)-2-(4-propylphenyl)-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide

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Tetrakis(triphenylphosphine)palladium(0) (60 mg) was added to a deoxygenated solution of sodium carbonate (212 mg), 4-propylphenylboronic acid (328 mg) and 2-chloro-N-(isobutoxycarbonyl)-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (828 mg) in a mixture of water (5 ml), ethanol (8 ml) and toluene (16 ml). The mixture was stirred and heated under argon at 80° C. for 17 hours and then allowed to cool to ambient temperature. Ice water (25 g) was added and the reaction extracted with ethyl acetate (3×50 ml). The combined organic layers were dried (MgSO4) and evaporated to afford an amber oil. This was purified by chromatography on a silica gel Mega Bond Elut column, eluting with 20% ethyl acetate/isohexane to give N-(isobutoxycarbonyl)-2-(4-propylphenyl)-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (760 mg) as a solid, mass spectrum (+ve ESP): 499 (M+H)+.

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