Oxalyl chloride → Isobutyl 4-[3-(3-ethoxy-3-oxopropyl)-4-isobutoxybenzoyl]-3-isobutoxybenzoate

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Reaction Steps

In 18 ml of methylene chloride is dissolved 1.8 g of 2-isobutoxy-4-(isobutoxycarbonyl)-benzoic acid. After adding 0.7 ml of oxalyl chloride and subsequently 20 μl of N,N-dimethylformamide at ambient temperature, the mixture thus obtained is stirred at ambient temperature for one hour. Then, 1.6 g of aluminum chloride and subsequently 1.8 g of ethyl 3-(2-isobutoxyphenyl)propanoate are added at 5-10° C., and the resulting mixture is stirred at ambient temperature for one hour. The reaction mixture is added to a mixture of chloroform and water and the organic layer is separated. The organic layer thus obtained is washed with water and saturated aqueous solution of sodium chloride successively and dried over anhydrous magnesium sulfate, and the solvent is distilled off under reduced pressure. The residue thus obtained is purified by silica gel column chromatography (eluent; hexane:ethyl acetate=5:1) to obtain 2.1 g of isobutyl 4-[3-(3-ethoxy-3-oxopropyl)-4-isobutoxybenzoyl]-3-isobutoxybenzoate as a colorless oily product.

Provenance & Evidence