A mixture of {4-[4-(3-pyrrolidin-1-ylpropoxy)phenyl]tetrahydropyran-4-yl}methylamine (150 mg, 0.47 mmol), 1-methylbenzimidazole-2-sulfonic acid (83.4 mg, 0.39 mmol) and N,N-diisopropylethylamine (175 μl, 0.98 mmol) in acetonitrile (1.5 ml) was heated at 155° C. in the Smith Personal Synthesiser for 2400 seconds and then a further 900 seconds. The reaction mixture was partitioned between dichloromethane (10 ml) and saturated aqueous sodium bicarbonate solution (10 ml). The organic layer was dried over sodium sulphate, filtered and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel eluting with dichloromethane:methanol:ammonia (100:0:0 to 95:5:0.5 by volume) to provide the title compound (29 mg, 14%). 1H NMR (400 MHz, CD3OD) δ 1.83-1.86 (m, 4H), 1.96-2.02 (m, 4H), 2.19 (d, 2H), 2.63-2.66 (m, 4H), 2.70 (t, 2H), 3.41 (s, 3H), 3.50 (t, 2H), 3.57 (s, 2H), 3.79-3.82 (m, 2H), 3.97 (t, 2H), 6.91 (d, 2H), 6.97-7.02 (m, 2H), 7.08 (d, 1H), 7.22 (d, 1H), 7.36 (d, 2H). LRMS APCI+ m/z 449 [MH]+.
