To a solution of 7-(bicyclo[2.2.1]hept-1-yl)-6-chloro-3-phenyl-1,2,4-triazolo[4,3-b]pyridazine (0.08 g, 0.25 mM, Example 1, step b) and 2-pyridylcarbinol (0.06 ml, 0.5 mM) in N,N-dimethylformamide (2 ml) under nitrogen was added lithium bis(trimethylsilyl)amide as a 1 mol solution in hexanes (0.375 ml). The reaction was stirred for 3 hours. Water was added until the solution became cloudy and after stirring for a further 15 minutes a solid was collected by filtration. This solid was recrystallised from ethyl acetate-hexane to give the required product (0.050 g, m.p.=166-168° C.). 1H NMR (360 MHz, DMSO) δ1.55 (2H, m), 1.91 (4H, m), 1.97 (2H, m), 2.13 (2H, m), 2.49 (1H, m), 5.77 (2H, s), 7.54 (1H, m), 7.69 (4H, s), 8.00 (1H, t, J=7.6 Hz), 8.28 (1H, s), 8.34 (2H, dd, J=7.6 and 1.5 Hz), 8.80 (1H, m); MS (ES+) m/e 398 [MH]+. Anal. Found C, 72.16; H, 5.59; N, 17.41. C24H23N5O. 0.1H2O requires C, 72.20; H, 5.86; N, 17.54%.
