To a solution of 7-{[(1S)-3-iodo-1-phenylpropyl]oxy}-1-benzothiophene-2-carbonitrile (222 mg, 0.5 mmol) in tetrahydrofuran (2 mL) was added 40% aqueous methylamine (0.83 mL) and the solution was stirred at room temperature for 16 hours. The solvent removed in vacuo and the residue purified by flash chromatography with a gradient of 0–15% methanol in dichloromethane. To a solution of free base (155 mg, 0.48 mmol) in methanol (1 mL) and added a warm solution of fumaric acid (40 mg, 0.48 mmol) in methanol (1 mL). The solvent removed in vacuo, and the solid residue triturated with diethyl ether (5 mL), then dried in a vacuum oven at 40° C. for 1 h to give the title compound (0.20 g, 85%); δH (300 MHz, DMSO) 8.40 (1H, s, 3-ArH), 7.61–7.52 (1H, m, ArH), 7.49–7.23 (6H, m, ArH), 7.05–6.98 (1H, m, ArH), 6.43 (2H, s, CHCO2H), 5.85–5.75 (1H, m, CHO), 3.05–2.90 (2H, m, 1-CH2), 2.52 (3H, s, NHCH3) and 2.46–2.07 (2H, m, 2-CH2).
