Toluene → 4-(4-isobutylphenyl)-N-(3-methoxy-5-methylpyrazin-2-yl)-N-[2-(trimethylsilyl)ethoxymethyl]pyridine-3-sulphonamide

Beteiligte Stoffe

Reaktionsschritte

Tetrakis(triphenylphosphine)palladium(0) (0.018 g) was added to a deoxygenated mixture of 4-chloro-N-(3-methoxy-5-methylpyrazin-2-yl)-N-[2(trimethylsilyl) ethoxymethyl]pyridine-3-sulphonamide (0.225 g), 4-isobutylphenylboronic acid (0.109 g), toluene (4 ml), ethanol (2 ml) and 2M sodium carbonate solution (6 ml) and the mixture was stirred and heated under reflux for 18 hours. Ether (25 ml) was added and the mixture was washed with water (2×25 ml) and saturated sodium chloride solution. Aqueous layers were back-extracted with ether (25 ml). The organic extracts were combined and dried (MgSO4). Volatile material was removed by evaporation and the residue was purified by gradient elution with 25-50% ethyl acetate/hexane through a silica gel Mega Bond Elut column to give 4-(4-isobutylphenyl)-N-(3-methoxy-5-methylpyrazin-2-yl)-N-[2-(trimethylsilyl)ethoxymethyl]-pyridine-3-sulphonamide (0.213 g) as an oil; 1H NMR (d6 -DMSO): -0.1 (s, 9 H), 0.7 (t, 2 H), 0.9 (d, 6 H), 1.9 (m, 1 H), 2.45 (s, 3 H), 2.5 (d, 2 H), 3.5 (t, 2 H), 3.8 (s, 3 H), 4.7 (s, 2 H), 7.2 (d, 2 H), 7.3 (d, 2 H), 7.4 (d, 1 H), 8.0 (s, 1 H), 8.8 (d, 1 H), 9.2 (s, 1 H); mass spectrum (+ve ESP): 543 (M+H)+.

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