Hydrochloric Acid → 1-Cyclopropyl-6,8-difluoro-7-[2-(dimethylaminomethyl)morpholino]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid.hydrochloride

Participants

Reaction Steps

A solution of 2.21 g of ethyl 1-cyclopropyl-6,8-difluoro-7-[2-(dimethylaminomethyl)morpholino]-1,4-dihydro-4-oxoquinoline-3-carboxylate and 5 ml of concentrated hydrochloric acid in 10 ml of water and 10 ml of ethanol is refluxed, for 2.5 hours. The resultant mixture is concentrated under reduced pressure and to the obtained crystals is added ethanol. The crystals are filtered off with suction, washed with ethanol and then dried to give 1.82 g of 1-cyclopropyl-6,8-difluoro-7-[2-(dimethylaminomethyl)morpholino]-1,4-dihydro-4-oxoquinoline-3-carboxylic acid.hydrochloride in 80% yield, melting at 267°-268° C.

Provenance & Evidence