Summary Starting from either 1, 4-dibenzyloxybenzene (7) or 2, 5-dimethoxyaniline (16), synthetic routes have been developed to benzenoid and quinoid derivatives of~-oxo-~, 4- dihydro-3-quinolinecarboxylic acid with 0-bearing substituents in the positions 5 and 8 (compounds 12-15, 19, 20, 23, and 24). With the l-ethyl-4, 5, 8-trioxo acid 14 as a dienophile, a series of linear tricyclic diene adducts (29-32) has been prepared, the ...
