Water → Ethyl 1-cyclopropyl-6,7-difluoro-8-methyl-5-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylate

Participants

Reaction Steps

To a solution of 27.1 g of ethyl 3-cyclopropylamino-2-(2,4,5-trifluoro-3-methyl-6-nitrobenzoyl)acrylate in 270 ml of 1,4-dioxane, 3.2 g of sodium hydride (60% mineral oil dispersion) was added by portions and stirred at room temperature for one hour. 300 ml of water was added to the reaction mixture and the deposited crystals were collected by filtration to give 19.5 g of the desired compound as colorless crystals, which was recrystallized from N,N-dimethylformamide to provide colorless needles, m.p. 260°-263° C.

Provenance & Evidence