Acetic Acid → 8-(2-Chloroacetyl)-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one

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Reaction Steps

13.8 g (46.0 mmol) 8-acetyl-6-benzyloxy-4H-benzo[1,4]oxazin-3-one and 35.3 g (101.5 mmol) benzyltrimethylammonium-dichloriodate are stirred in 250 mL dichloroethane, 84 mL glacial acetic acid and 14 mL water for 5 hours at 65° C. After cooling to ambient temperature the mixture is combined with 5% sodium hydrogen sulfite solution and stirred for 30 minutes. The precipitated solid is suction filtered, washed with water and diethyl ether and dried. Yield: 13.2 g (86%); mass spectroscopy [M+H]+=330/32.

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