A new procedure for making 2,3‐quinolinedicarboxylic acid ( 6 ), starting with aniline and maleic anhydride has been developed. Evidence for the formation of 2‐anilino‐3‐formyl‐ N ‐phenylmaleimide ( 7 ) in the cyclization of S‐phenylimino‐4‐dimethylaminomethylene‐ N ‐phenylsuccinimide ( 4a ) to N ‐phenylacridinimide ( 5a ) is presented.
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Donald R. Maulding (1988) studied this question.
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