2,4-Bis(methylsulphonyl)-5-phenyl-furo[2,3-d]-pyrimidine (400 mg, 1.14 mmol) in acetonitrile (10.0 mL) was treated with 4-(2-pyrrolidine-1-ylethyloxymethyl)piperidine (360 mg, 1.7 mmol) and potassium carbonate (219 mg, 1.71 mmol) and heated in a microwave at 120° C. for 30 min. The reaction was concentrated in vacuum to a gum and the residue was partitioned between ethyl acetate and water. The ethyl acetate layer was separated, dried over sodium sulphate and concentrated in vacuum to a gum. The gum was purified by preparative HPLC (basic method 6) to yield methylsulfonyl-5-phenyl-4-[4-(2-pyrrolidin-1-ylethoxymethyl)-1-piperidyl]furo[2,3-d]pyrimidine (96 mg, 0.198 mmol, 17%). 1H NMR (CDCl3) δ: 1.07 (2H, m), 1.52 (2H, br d, J=8 Hz), 1.75 (5H, br s), 2.5 (4H, b s), 2.6 (2H, t, J=5 Hz), 2.8 (2H, t, J=8 Hz), 3.18 (2H, d, J=4 Hz), 3.35 (3H, s), 3.5 (2H, t, J=4 Hz), 4.05 (2H, d, J=8 Hz), 7.4 (5H, m), 7.6 (1H, s).
