Andersag, Breitner and Jung3 prepared a number of 2-carbethoxy-4-hydroxyquinoline derivatives by thermal cyclization of P-carbethoxy-PI-anilinoacrylates, which themselves were obtained by the reaction of aromatic amines with oxalacetic ester. After removal of the carbethoxy group by hydrolysis and decarboxylation the 4-hydroxyquinolines were converted to 4-chloroquinolines which then could be condensed with basic side-c hains ...
