Methyl iodide → 4-[2-Methoxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

A mixture of 4-[2-Hydroxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester (200 mg, 0.53 mmol) in tetrahydrofuran (5 mL) and N,N-dimethylformamide (5 mL) at 0° C. was added sodium hydride (60% in mineral oil, 70 mg, 1.75 mmol) followed by iodomethane (230 mg, 1.62 mmole). The mixture was stirred at 0° C. for three hours. The reaction was quenched with saturated aqueous ammonium chloride solution and partitioned between ethyl acetate and water. The organic layer was dried with magnesium sulfate. Filtration, concentration gave a crude oil which was loaded onto a column of silica gel. Elution with 50% ethyl acetate/hexanes gave 4-[2-Methoxy-1-(3-trifluoromethyl-phenyl)-ethyl]-piperazine-1-carboxylic acid tert-butyl ester (190 mg, 92% yield) as a colorless oil. The NMR spectrum obtained on the sample is compatible with its structure.

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