Thionyl Chloride → 8-Acetyl-3-methoxy-benzo[c]chromen-6-one

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Reaction Steps

The compound from Step D was dissolved in 1,2-dichloroethane (60 mL) and SOCl2 (1.7 mL, 23 mmol) was added. The mixture was refluxed for 90 min and then cooled to 0° C. at which point AlCl3 (2.3 g, 17.3 mmol) was added. The resulting reaction mixture was stirred overnight at room temperature. The solvent was removed and the crude product chromatographed on silica gel with hexane/ethyl acetate (1:1) to yield 5.1 g (90%) of the title compound. 1H-NMR (400 MHz, CDCl3) δH 2.74 (3H, s, COCH3), 3.94 (3H, s, OCH3), 6.92 (1H, s, ArH), 6.99 (1H, ArH), 8.02 (1H, d, ArH), 8.11 (1H, d, ArH), 8.41 (1H, d, ArH), 8.91 (1H, s, ArH).

Provenance & Evidence