Hydrochloric Acid → 7-Bromo-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride

関与物質

反応手順

1,1-dimethylethyl 7-bromo-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (10 g, 30.5 mmol) was taken into hot ethanol (10 mL) followed by addition of 4 M hydrogen chloride in dioxane solution (2.1 eq, 16 mL) and the resulting solution was allowed to slowly cool to ambient temperature over one hour. An excess of ethyl ether was then added and the resulting slurry was filtered. The filter cake was washed with ethyl ether and dried to give 7-bromo-2,3,4,5-tetrahydro-1,4-benzoxazepine hydrochloride (7.9 g, 98% yield) as a colorless crystalline solid. MS (EI) for C9H10NOBr: 229 (MH+).

情報源と証拠