Hydrochloric Acid → 8-fluoro-5-hydroxy-3,4-dihydro-1 (2H)-naphthalenone

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Reaction Steps

A solution of 8-fluoro-5-methoxytetralone (Owton, W. M. J. Chem. Soc., Perkin Trans. 1 (1994), 2131-2135) (7.0 g, 36 mmol) in 1,2-dichlorethane (150 mL) was treated with aluminum chloride-(21 g, 157 mmol), refluxed for 3.5 hours, cooled to ambient temperature, poured carefully into 4M HCl (500 mL), stirred for 16 hours, treated with dichloromethane (400 mL) and thoroughly shaken. A black solid was removed by filteration through Celite®. The dichloromethane layer was isolated, combined with the black solid and extracted with 5% sodium hydroxide solution (3×150 mL). The combined sodium hydroxide extracts were acidified with 4M hydrochloric acid and the resulting solid was collected by filtration to provide the desired product as a brown solid.

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