Non-steroidal antiinflammatory agents. 3. Synthesis of 3-hydroxy-3-hydroxyphenyl-2,4-dioxo-1,2,3,4-tetrahydroquinolines

The acid-catalyzed condensation of quinisatines 5a-c or their aminals 4a-c with phenols 6a-i led to a number of 3-hydroxy-3-hydroxyphenyl-2,4-dioxo-1,2,3,4-tetrahydroquinolines 7a-s which were considered as potential antiinflammatory agents.