process for the production of 1,4 - dihydro - 4 - oxo quinoline 2 carbonsaeuren or salts, esters or amides and interconnection price.

摘要

There is described a process for the production of a 1,4-dihydro-4-oxo-quinoline-2-carboxylic acid, or a salt, ester or amide thereof, which comprises cyclization of a corresponding 2-aminobenzoyl pyruvic acid or an ester thereof, and if desired or necessary converting the resulting product to an appropriate salt, ester or amide thereof, or vice versa.