反应详情

To a stirred solution of 5-chloro-4-iodo-2-methoxybenzoic acid (1.55 g, 4.9 mmol) in DMF (30 mL) at RT, tert-butyl piperazine-1-carboxylate (1.02 g, 5.5 mmol), BOP (2.63 g, 25.9 mmol) and DIEA (1.92 g, 14.9 mmol) were added and the resulting mixture was stirred at RT for 1 h. The reaction mixture was extracted with ethyl acetate and washed with 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 (dichloromethane/methanol=50:1) to afford the desired product (1.96 g, 76% yield).

1. extractionThe reaction mixture was extracted with ethyl acetate
2. washwashed with brine
3. dry with materialThe organic layer was dried over anhydrous Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash column chromatography on silica gel (dichloromethane/methanol=50:1)