Triethylsilane → ethyl 5,6-dihydro-9-methyl-4H-pyrrolo[3,2,1-ij]quinoline-2-carboxylate

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Reaction Steps

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).

Provenance & Evidence