Abstract A reductive decarboxylation of 7-chloro-1-ethyl-6-fluoro-1, 4-dihydro-4- oxoquinoline-3-carboxylic acid (Id) with sodium borohydride provided the respective 1, 2, 3, 4-tetrahydro derivative Va, which was treated with selenium dioxide to give product of dehydrogenation VIa. 3-Acetyl-1-ethyl-1, 4-dihydroquinolin-4-ones VIb and VIc were oxidized with 3-chloroperoxybenzoic acid to the respective 3-hydroxyderivatives IIIa and ...
