Aluminum(III) Chloride → 5-Methoxy-3-phenyl-1-tetralone

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4-(2'-Methoxyphenyl)-3-phenylbutyric acid (29.1 g, 108 mmol), from Step 5, was dissolved in 50 mL of thionyl chloride and heated to 60° C. for 10 min. After stirring an additional 30 min at ambient temperature, the solvent was removed in vacuo. The crude product was dissolved in 60 mL of methylene chloride and the resultant solution was added dropwise to 15.8 g (118 mmol) of aluminum chloride in 240 mL of methylene chloride precooled to 0° C. After the addition, the reaction was allowed to proceed at 0° C. for 1 h, and then quenched by the addition of 500 g of ice. The methylene chloride layer was separated and washed with 3×200 mL of water, dried over anhydrous sodium sulfate, filtered and concentrated in vacuo to give 9.84 g (36% yield) of 5-methoxy-3-phenyl-1,2,3,4-tetrahydro-1-naphthalenone as a clear yellow oil; 1H NMR (CDCl3 )δ2.48 (dd, 1H), 2.65-2.8 (m, 2H), 3.20 (dd, 1H), 3.7-3.85 (m, 1H), 3.82 (s, 3H), 6.85-6.95 (m, 2H), 7.08 (dd, 1H), 7.2-7.3 (m, 1H), 7.35-7.4 (m, 2H), 7.57 (dt, 1H), 7.73 (d, 1H); DCl MS M/Z: 270 (M+NH4)+, 253 (M+H)+.

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