反应详情

To a solution of 2-benzoylpyrrole (171mg, 1 mmol) and diethyl bromomalonate (1185 mg, 5 mmol) in benzene (20 mL) was added triethylborane (1.0 M in hexane, 5 mL, 5 mmol). The reaction mixture was stirred for 1 hour in an open vessel. Additional triethylborane (1 mL, 1 mmol) was added and the reaction was stirred for an additional hour. The mixture was poured into water and extracted with diethyl ether. The ethereal extract was washed with saturated aqueous sodium chloride, dried (Na2SO4), and concentrated. The residue was purified by column chromatography on silica eluting with hexane/ethyl acetate (87:13) to provide 284 mg (86%) of diethyl (5-benzoylpyrrol-2-yl)methane-dicarboxylate.

1. stirringthe reaction was stirred for an additional hour
2. extractionextracted with diethyl ether
3. extractionThe ethereal extract
4. washwas washed with saturated aqueous sodium chloride
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customThe residue was purified by column chromatography on silica eluting with hexane/ethyl acetate (87:13)