Trimethylsilyldiazomethane → Methyl 4-isobutyl-3-(trifluoromethyl)benzoate

Participants

Reaction Conditions

Reaction Steps

To 4-isobutyl-3-(trifluoromethyl)benzoic acid (Preparation 23A, 0.55 g, 2.234 mmol) in dichloromethane (5 mL) and methanol (2.00 mL) was added trimethylsilyldiazomethane (1.452 mL, 2.90 mmol) at 0° C. The reaction mixture was stirred at 0° C. for 30 min. Excess trimethylsilyldiazomethane was quenched by the slow addition of acetic acid (˜0.5 ml) at room temperature. The reaction mixture was concentrated and partitioned between ethyl acetate (20 mL) and sat. aq. sodium bicarbonate (10 mL). The ether layer was washed with brine (10 mL), dried over sodium sulfate, and concentrated. The resulting dark oil was subjected to silica gel column chromatography (hexane/ethyl acetate). Fractions corresponding to the product were collected and concentrated to yield an oil. The oil was azeotroped with THF (2×5 mL) and dried under high vacuum to yield methyl 4-isobutyl-3-(trifluoromethyl)benzoate (0.52 g, 1.998 mmol, 89% yield) as a clear liquid.

Provenance & Evidence