Water → 2,2-difluoro-4-methyl-7-nitro-4H-1,4-benzoxazin-3-one

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Reaction Steps

To a stirred suspension of 2,2-difluoro-7-nitro-4H-1,4-benzoxazin-3-one (WO 99/40094, 2.16 g, 9.38 mmol) in DMF (10 mL) is added K2CO3 (1.94 g, 14.07 mmol) followed by addition of MeI (0.87 mL, 14.07 mmol). The resulting solution is stirred over night at room temperature. To this reaction mixture is added water (50 mL), and the resulting solution is extracted with EtOAc (50 mL×3). The combined organic phases are washed with water (50 mL) and saline (50 mL), dried over Na2SO4 and concentrated under reduced pressure to give the title compound that is purified by passing through a short silica gel column with EtOAc (1.3 g, 57%), 1H NMR (300 MHz, DMSO) δ 8.25–8.17 (m, 2H), 7.62 (d, 1H), 3.47 (s, 3H).

Provenance & Evidence