Hydrochloric Acid → 9a-butyl-4-(4-hydroxyphenyl)-7-methoxy-1,2,9,9a-tetrahydro-3H-fluoren-3-one

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A suspension of 9a-butyl-7-methoxy-4-(4-methoxymethoxy-phenyl)-1,2,9,9a-tetrahydro-3H-fluoren-3-one (813 mg, 2 mmol) in methanol (12 mL) was warmed in an oil bath at 60° C. and treated with aqueous 2N HCl (4 mL). The resulting mixture was stirred and heated at 60° C. for two hours, then cooled to room temperature and evaporated under vacuum to leave a yellow semi-solid. The residue was dissolved in EtOAc, washed with water and brine, dried over MgSO4, filtered, evaporated under vacuum, and stripped with toluene to afford 9a-butyl-4-(4-hydroxy-phenyl)-7-methoxy-1,2,9,9a-tetrahydro-3H-fluoren-3-one (787 mg, ca. 92% weight pure) as a yellow foam.

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