Potassium Carbonate → 4-(4-Bromophenylsulphonyl)-1-[2-(4-fluorophenyl)-2-oxoethyl]piperidine

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4-(4-Bromophenylsulphonyl)piperidine (Example 1 Step d, 0.9 g, 0.003 mol) was added to a mixture of 2-bromo-4′-fluoroacetophenone (0.7 g, 0.0033 mol) and potassium carbonate (0.84 g, 0.006 mol) in acetonitrile (5 ml) and the resulting slurry stirred at room temperature for 17 h. The insolubles were removed by filtration and the solvent evaporated to give a gum which was purified by column chromatography (SiO2, CH2Cl2:MeOH 97:3) to give 0.5 g (36% yield) of product as a colourless solid. δH (400 MHz, CDCl3) 1.75-1.90 (2H, m), 2.05-2.13 (2H, m), 2.25-2.40 (2H, m), 2.85-3.00 (1H, m), 3.04-3.20 (2H, m), 3.75-3.85 (2H, m), 7.12 (1H, t, 8 Hz), 7.24 (4H, s), 7.98-8.02 (2H, m).

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