INTERMEDIATES FOR PREPARING 1,4-DIHYDRO-4-OXO-QUINOLINE-3-CARBOXYLIC ACID ESTERS

摘要

Compounds of the formula: wherein Y is OR<1>, fluoro, chloro, methyl, R<1>, and R<3> are independently selected from hydrogen and C1-C4 alkyl, R<2> is C1-C4 alkyl and X is fluoro, chloro or bromo, with the proviso that when Y is OH, X cannot be bromo and with the proviso that X can be fluoro only if R<2> is methyl.