To a solution of 3,8-diphenylimidazo[1,2-d][1,2,4]triazin-2-ol (500 mg, 1.74 mmol) and 3-chloromethyl-2-methyl-2H-[1,2,4]triazole hydrochloride (320 mg, 1.91 mmol) in anhydrous N,N-dimethylformamide under an atmosphere of nitrogen was added sodium hydride (153 mg of a 60% dispersion in oil, 3.8 mmol). The reaction mixture was stirred at room temperature for 72 h. The mixture was partitioned between EtOAc (80 ml) and water (150 ml), the organic layer was separated, and the aqueous layer extracted with a further two portions of EtOAc (80 ml). The combined EtOAc layers were washed with saturated NaCl solution (100 ml), separated, dried over MgSO4 and evaporated in vacuo. The residue was purified by flash chromatography (SiO2; 2% MeOH in CH2Cl2+0.5% NH3), and the product recrystallised from CH2Cl2 to afford 235 mg (0.6 mmol, 35%) as a white solid. (Found: C, 63.66; H, 4.23; N, 24.54; C21H17N7O.0.5H2O.0.07CH2Cl2 requires C, 63.47; H, 4.59; N, 24.59%); m.p. 179° C. (from CH2Cl2); δH (400 MHz; CDCl3) 3.95 (3H, s, NCH3), 5.75 (2H, s, OCH2), 7.46 (1H, t, J 7.3, aromatic), 7.52-7.60 (5H, m, aromatics), 7.63 (2H, d, J 7.6, aromatics), 7.88 (1H, s, triazole H5), 8.57-8.65 (2H, br m, aromatics), 9.43 (1H, s, imidazotriazine H5); m/z (ES+) 384 (M++H, 100%).
