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A mixture of methyl (4-{[4-(methyloxy)phenyl]carbonyl}phenyl)acetate (151) (1.00 g, 3.52 mmol) and AlCl3 (1.90 g, 14.07 mmol) were refluxed in benzene (40 mL) for 1 h and then cooled to 0° C. in an ice bath. Water (35 mL) was added slowly, and the mixture was extracted with ether (2×50 mL, each contained 15 mL of EtOAc). The combined ethereal extract was washed with water, brine, and dried over Na2SO4. Concentration gave light brown oil, which was purified by chromatography on a silica gel column eluted with a gradient from hexanes to 45% EtOAc:hexanes to afford 0.86 g (90%) of compound 152 as colorless oil. 1H NMR (400 MHz, CDCl3): δ 3.71 (s, 2H), 3.72 (s, 3H), 5.63 (br s, 1H), 6.89 (d, J=8.6 Hz, 2H), 7.38 (d, J=8.0 Hz, 2H), 7.72 (d, J=8.1 Hz, 2H), 7.77 (d, J=8.6 Hz, 2H), 8.24 (d, J=7.9 Hz, 1H). LCMS (ESI): m/z 271 (M+H)+, 269 (M−H)−.

1. extractionthe mixture was extracted with ether (2×50 mL
2. extractionThe combined ethereal extract
3. washwas washed with water, brine
4. dry with materialdried over Na2SO4
5. concentrationConcentration
6. customgave light brown oil, which
7. customwas purified by chromatography on a silica gel column
8. washeluted with a gradient from hexanes to 45% EtOAc