2-Aminoterephthalic acid → 9-Oxo-5,6,7,8,9,10-hexahydro-acridine-3-carboxylic acid

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To a suspension of 2-amino terephthalic acid (12 g, 6.6 mmols) in diphenyl ether (120 mL), cyclohexanone (25 mL) was added and the reaction mixture was heated to 250° C. for 10 min. Reaction completion was monitored by LC/MS (75% starting material and 25% Product formation was observed). Cyclohexanone (25 mL) was added and the reaction mixture was heated to 250° C. for another 10 min. (LC/MS showed 50% product formation). The above process was repeated till LC/MS showed complete product formation (Starting material <2%). The reaction mixture was cooled to 25° C., product was filtered, washed with hexane (100 mL) and dried under vacuum to get 15.8 g of (Via) (98%) as a yellow solid.

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