Methyl iodide → 1-methyl-7-nitro-4,5-dihydro-3,1-benzoxazepin-2(1H)-one

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Reaction Steps

A mixture of 2-nitro-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one (0.7 g, 3.36 mmol), potassium carbonate (1.4 g, 10.1 mmol, 3 eq.), and iodomethane (0.42 mL, 6.7 mmol, 2 eq.) was stirred for 16 hours in DMF (10 mL). The mixture was diluted with water (50 mL) and extracted with ethyl acetate (3×20 mL). The combined organic layers were dried (sodium sulfate) and concentrated to provide 2-nitro-5-methyl-8,9-dihydro-5H-7-oxa-5-aza-benzocyclohepten-6-one: 1H NMR (300 MHz, CDCl3) δ 8.19 (dd, 1H), 8.13 (d, 1H), 7.28 (d, 1H), 4.55 (t, 2H), 3.43 (s, 3H), 3.10 (t, 2H).

Provenance & Evidence