p-Toluenesulfonic acid → 5-methyl-N-[4-(methyloxy)phenyl]-7-phenylimidazo[5,1-f][1,2,4]triazin-2-amine

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A mixture of 5-methyl-2-(methylthio)-7-phenylimidazo[5,1-f][1,2,4]triazine (Intermediate 72) (75 mg, 0.26 mmol), p-anisidine (32 mg, 0.26 mmol) and p-toluenesulfonic acid (5 mg, 0.03 mmol) in tetrahydrofuran (5 mL) was stirred at reflux overnight. The mixture was then reduced under vacuum, and purified by chromatography on silica gel eluting with 40% ethyl acetate in petrol to give a solid which was purified further by trituration with diethyl ether to afford 5-methyl-N-[4-(methyloxy)phenyl]-7-phenylimidazo[5,1-f][1,2,4]triazin-2-amine (20 mg) as a yellow solid. MS m/z 332 (M+1).

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