Triethylamine → HCID 20063282, compound

Participants

Reaction Conditions

Reaction Steps

2.7 cm3 of triethylamine are added to a suspension of 1.9 g of 2-fluoroethylamine hydrochloride in 25 cm3 of trichloromethane. 3.5 g of ethyl 2-(2,7-dichloro-6-fluoroquinoline-3-carbonyl)-3-dimethylaminoacrylate are added to the solution obtained at about 20° C. After stirring at this temperature for 16 hours, the solution is concentrated to dryness under reduced pressure (20 kPa) at about 50° C. The residue is taken up in 20 cm3 of ethanol and 3 cm3 of triethylamine and heated at about 75° C., with stirring, for 2 hours. After cooling to about 20° C. the insoluble matter is drained and washed with twice 10 cm3 of ethanol and twice 10 cm3 of diisopropyl ether. 1.9 g of 8-chloro-3-ethoxycarbonyl-7-fluoro-1-(2-fluoroethyl)-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine are obtained in the form of a yellow solid melting at 268° C., which is used for the subsequent step without further purification

Provenance & Evidence