反应详情

To a stirred solution of 4-chloro-5-iodo-2-methoxyaniline (968 mg, 3.42 mmol) in anhydrous THF (20 mL) at 0° C., NaH (60% in mineral oil, 205.2 mg, 5.13 mmol) was added and the resulting mixture was stirred at reflux under nitrogen for 1 h. To this mixture, tert-butyl-4-(2-bromoethyl)piperazine-1-carboxylate (500 mg, 1.71 mmol) was added and the resulting mixture was stirred at room temperature for 15 h. The mixture was concentrated in vacuo and the residue was partitioned between ethyl acetate and brine. The organic layer was dried over anhydrous Na2SO4, filtered and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel (10-30% ethyl acetate/petroleum ether) to afford the desired product (180 mg, 21% yield) as a solid.

1. temperatureat reflux under nitrogen for 1 h
2. stirringthe resulting mixture was stirred at room temperature for 15 h
3. concentrationThe mixture was concentrated in vacuo
4. customthe residue was partitioned between ethyl acetate and brine
5. dry with materialThe organic layer was dried over anhydrous Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was purified by flash column chromatography on silica gel (10-30% ethyl acetate/petroleum ether)