反应详情

A mixture of 1-(2-tert-butylphenyl)piperazine dihydrochloride obtained in Reference Example 1 (0.5 g), methyl 4-(chlorocarbonyl)benzoate (397 mg), triethylamine (0.836 mL), and tetrahydrofuran (10 mL) was stirred at room temperature for over-night. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by flash column chromatography (NH-silica gel, 90:10-50:50 hexane/ethyl acetate) to provide the title compound (628 mg, 96%) as crystals.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe ethyl acetate layer was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customThe solvent was evaporated under reduced pressure
5. customthe residue was purified by flash column chromatography (NH-silica gel, 90:10-50:50 hexane/ethyl acetate)