Hydrochloric Acid → EN 272
Reaction equation
[F:1][CH:2]([F:22])[N:3]1[C:12]2[C:7](=[CH:8][C:9]3[O:15][CH2:14][O:13][C:10]=3[CH:11]=2)[C:6](=[O:16])[C:5]([C:17]([O:19]CC)=[O:18])=[CH:4]1.Cl>O>[F:22][CH:2]([F:1])[N:3]1[C:12]2[C:7](=[CH:8][C:9]3[O:15][CH2:14][O:13][C:10]=3[CH:11]=2)[C:6](=[O:16])[C:5]([C:17]([OH:19])=[O:18])=[CH:4]1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 27.5 g of 1-difluoromethyl-6,7-methylenedioxy-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid, ethyl ester and 600 ml of 6N hydrochloric acid is heated under reflux for 1.5 hours. The mixture is diluted with 1 liter of water, cooled, and filtered. The solid product is triturated with cold ethanol and filtered to give 24.5 g of the desired product, m.p. 327°-8° C. (dec).