Dimethylformamide → 1-(1-Ethylpropyl)-8-methoxy-N,N-dimethyl-4-oxo-4,5-dihydroimidazo[1,5-a]quinoxaline-7-carboxamide

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Reaction Steps

1-(1-Ethylpropyl)-8-methoxy-4-oxo-4,5-dihydroimidazo[1,5-a]-quinoxaline-7-carboxylic acid as synthesized in above Example 32, 329 mg, N,N-dimethylformamide 5 mL and 1,1′-carbonyldiimidazole 275 mg were mixed and stirred for an hour at room temperature in nitrogen atmosphere. Dimethylamine hydrochloride 816 mg was added, followed by 5.5 hours' stirring. The reaction mixture was diluted with water, extracted with ethyl acetate and washed with saturated saline. The extract was dried over anhydrous sodium sulfate, and from which the solvent was distilled off. To the residue tert-butyl methyl ether was added, heated under stirring, and the precipitate was recovered by filtration, followed by washing with tert-butyl methyl ether. The product was dried in flowing air (40° C.) to provide 223 mg of the title compound.

Provenance & Evidence