Hydrochloric Acid → Methyl 4-(2-(2-(acetylthio)-4-methoxyphenyl)-2-oxoethyl)benzoate

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Reaction Steps

To a suspension of aluminum trichloride (9.9 g, 74.08 mmol) in DCM (100 ml) was added S-3-methoxyphenyl ethanethioate (step 1) (4.5 g, 30.57 mmol) at 0˜5° C., followed by a solution of methyl 4-(2-chloro-2-oxoethyl)benzoate (step 2) (4.5 g, crude, 24.69 mmol) in DCM (20 ml). The mixture was stirred at room temperature for 3 days. The mixture was poured carefully into icy 1 N HCl (200 ml) and extracted with EtOAc (50 ml×2). The combined organic layers were washed with water (100 ml×2) and brine (100 ml), dried with anhydrous sodium sulfate, filtered and concentrated. The residue was purified by column chromatography (PE/EtOAc=15/1 to 10/1) to afford Intermediate F as a yellow solid (1.8 g, 14%). MS (ESI): m/z 359.0 [M+1]+.

Provenance & Evidence