Water → 6-bromo-3,4-dihydro-9-methoxy-2H-1,5-benzodioxepin

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3-bromo-6-methoxycatechol (31 g) was dissolved in DMF (50 ml), mixed with 1,3-dibromopropane (36 ml) and potassium fluoride (42 g), stirred for 12 hours while heating at 110° C. The resultant was allowed to stand for cooling, mixed with water, and extracted with ether. The organic layer was washed with an aqueous sodium hydroxide solution, water, and a saturated aqueous sodium chloride solution in that order, dried over manganese sulfate, and evaporated under reduced pressure for removing the solvent. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=7/1) to give Compound IIbr-a (6.7 g, 18%) as a white solid.

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