Ethyl Acetate → N-(2-t-Butyl-5-carboxyphenyl)-3-(4-acetyl-2-methoxyphenyl)octanamide

Participants

Reaction Steps

A solution of 537 mg (1.15 mmol) of N-(2-t-butyl-5-methoxycarbonylphenyl)-3-(4-formyl-2-methoxyphenyl)octanamide (prepared as described in Preparation 63A) in 10 ml of tetrahydrofuran was cooled to -78° C., and 4.1 ml (3.9 mmol) of a 0.95 M solution of methylmagnesium bromide in tetrahydrofuran were added dropwise thereto over a period of 5 minutes. The reaction mixture was stirred at the same temperature for 1 hour and then at 0° C. for 90 minutes, after which a saturated aqueous solution of ammonium chloride was added to the mixture to terminate the reaction. The mixture was then extracting with ethyl acetate. The extract was washed with water and with a saturated aqueous solution of sodium chloride, after which it was dried over anhydrous magnesium sulfate. The solvent was then removed by distillation under reduced pressure, and the resulting residue was purified by column chromatography through 25 g of silica gel, using a gradient elution method, with mixtures of ethyl acetate and hexane ranging from 1:1 to 3:2 by volume, to give 479 mg (yield 86%) of the title compound as a foam-like substance.

Provenance & Evidence