Sodium Chloride → N-(aminoiminomethyl)-5,6-dihydro-6-oxo-9-methyl-4H-pyrrolo[3,2,1-ij]quinoline-2-carboxamide

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Reaction Steps

A mixture of ethyl 5,6-dihydro-9-methyl-6-oxo-4H-pyrrolo [3,2,1-ij]quinoline-2-carboxylate (0.65 g, 2.53 mmol), guanidine hydrochloride (1.21 g, 12.6 mmol), sodium methoxide (0.68 g, 12.6 mmol) and N,N-dimethylformamide (35 ml) was stirred at room temperature for 18 hours. The reaction mixture was poured into a 10% aqueous sodium chloride solution and extracted three times with ethyl acetate, and the extract solution was washed with a 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure to obtain crude N-(aminoiminomethyl)-5,6-dihydro-6-oxo-9-methyl-4H-pyrrolo [3,2,1-ij]quinoline-2-carboxamide. This crude product was added to a mixture of aqueous isopropanol and methanesulfonic acid (0.47 g, 4.89 mmol) and dissolved therein by heating, and the resulting solution was cooled to 0° C. The crystals precipitated were collected by filtration and then recrystallized from water to obtain N-(aminoiminomethyl)-5,6-dihydro-9-methyl-6-oxo-4H-pyrrolo[3,2,1-ij]quinoline-2-carboxamide methanesulfonate (0.57 g)

Provenance & Evidence