反应详情

Triethylsilane (3.07 g, 26.4 mmol) was added dropwise to a mixture of ethyl 5,6-dihydro-9-methyl-6-oxo-4H-pyrrolo[3,2,1-ij]quinoline-2-carboxylate (1.70 g, 6.61 mmol) and trifluoroacetic acid (20 ml) at room temperature. Then, the reaction mixture was stirred at room temperature for 3 hours and distilled under reduced pressure to remove the solvent. Ice water was added to the residue, followed by extraction with ethyl acetate (twice). The extract solution was washed with a 5% aqueous sodium hydrogencarbonate solution and then a 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate/n-hexane=3/97) to obtain 0.87 g of ethyl 5,6-dihydro-9-methyl-4H-pyrrolo[3,2,1-ij]quinoline-2-carboxylate. M.p. 51-52° C. (after recrystallization from n-hexane).

1. distillationdistilled under reduced pressure
2. customto remove the solvent
3. additionIce water was added to the residue
4. extractionfollowed by extraction with ethyl acetate (twice)
5. washThe extract solution was washed with a 5% aqueous sodium hydrogencarbonate solution
6. dry with materiala 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate
7. distillationThe solvent was distilled off under reduced pressure
8. customthe resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate/n-hexane=3/97)