Benzyl chloroformate → 4-(5-Bromo-3-trifluoromethyl-pyridin-2-yl)-piperazine-1-carboxylic acid benzyl ester

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Reaction Conditions

Reaction Steps

Benzyl chloroformate (806 μL, 5.7 mmol, Aldrich) was added dropwise to a mixture of 1-(5-bromo-3-trifluoromethyl-pyridin-2-yl)-piperazine (1.6 g, 5.2 mmol, Example 112a) and diisopropylethylamine (1.1 mL, 6.24 mmol, Aldrich) in dichloromethane (35 mL) with stirring at 0° C. The mixture was stirred at room temperature for 16 h. The solvent was removed in vacuo and the residue was purified by silica gel column chromatography (2%-100% EtOAc/hexane) to give the title compound as an orange oil. MS (ESI, positive ion) m/z: 444 (M+1).

Provenance & Evidence