Bromine → 2-Bromo-5-[2-(3-chloro-phenyl)-ethoxy]-4-methoxy-benzoic acid methyl ester

関与物質

反応条件

反応手順

Methyl 3-hydroxy-4-methoxybenzoate and 2-(3-chlorophenyl)-ethanol were reacted in analogy to step 1 of example 1. The obtained 3-[2-(3-chloro-phenyl)-ethoxy]-4-methoxy-benzoic acid methyl ester (300 mg, 0.935 mmol) and sodium acetate (230 mg, 2.81 mmol) were dissolved in acetic acid (10 ml), bromine (224 mg, 1.40 mmol) was added, and the mixture was stirred at 95° C. with reaction control every hour. When the reaction did no more proceed, further bromine was added. After 5 h the reaction was completed. The volatiles were evaporated in vacuo, the residue was partitioned between EA and a saturated aqueous sodium hydrogencarbonate solution, and the aqueous phase extracted with EA. The combined organic extracts were washed with a saturated sodium chloride solution, dried over sodium sulfate, filtered and evaporated to dryness. This residue was purified by silica chromatography (HEP/EA gradient) to give 180 mg of the title compound.

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