Methyl 4-acetylamino-5-bromo-3-(3,3-dimethyl-1-butynyl)salicylate → Methyl 4-acetylamino-5-bromo-2-tert-butyl-1-benzofuran-7-carboxylate

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Reaction Steps

Methyl 4-acetylamino-5-bromo-3-(3,3-dimethyl-1-butynyl)salicylate (I-250) (202 mg, 0.55 mmol) was dissolved in a mixed liquid of triethylamine (4 ml) and toluene (10 ml), and stirred with heating under reflux for 2 hours. After cooling to room temperature, the reaction liquid was concentrated under reduced pressure, the resulting residue was subjected to column chromatography, and the eluate with n-hexane/ethyl acetate (2:1) gave the entitled compound (165 mg, 82%) as a white solid.

Provenance & Evidence