2-Fluoro-4-nitrophenol → 4-(2-Fluoro-4-nitrophenoxy)-5-methylpyrrolo[2,1-f][1,2,4]triazine

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Reaction Steps

To a mixture of 4-chloro-5-methylpyrrolo[2,1-f][1,2,4]triazine (3.37 g, 20.11 mmol, PCT Appl. WO 2000/071129, U.S. pat. application 2003/0186982, the disclosure of which is herein incorporated by reference) and 2-fluoro-4-nitrophenol (3.48 g, 22.12 mmol) in anhydrous DMF (100 mL), stirred for 5 minutes under a nitrogen atmosphere, was added anhydrous potassium carbonate (6.11 g, 44.24 mmol). The mixture was heated at 60° C. for 15 h before 2-fluoro-4-nitrophenol (1.00 g, 6.37 mmol) was added and stirring continued at 60° C. for 4.5 h. The mixture was cooled to room temperature, diluted with dichloromethane, washed sequentially with water and 10% aqueous lithium chloride, dried over anhydrous magnesium sulfate and concentrated in vacuo to yield a tan solid. Purification by silica gel (Merck KGaA, 230–400 mesh particle size) flash chromatography, eluting with chloroform, afforded the title compound (4.19 g, 72%) as a pale yellow solid. 1H NMR (CDCl3) δ 8.20–8.13 (m, 2H), 7.83 (s, 1H), 7.73 (d, 1H, J=2.6 Hz); 7.58–7.53 (m, 1H), 6.69 (d, 1H, J=2.4 Hz), 2.62 (s, 3H); HRMS(ESI), 289.0737 (M+H)+ calc, 289.0733 (M+H)+ found.

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