Hydrochloric Acid → 4-Chloro-9H-dipyrido[2,3-b;4',3'-d]pyrrole-6-carboxylic acid

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A mixture of 4-chloro-9H-dipyrido[2,3-b;4′,3′-d]pyrrole-6-carboxylic acid methyl ester (0.73 g, 2.8 mol) and lithium hydroxide (0.38 g, 9.0 mmol) in tetrahydrofuran (15 mL) and water (3 mL) was heated at 50° C. for 1.5 hours. The mixture was allowed to cool to ambient temperature, treated with hydrochloric acid (1M, 9 mL) and evaporated in-vacuo to afford a grey solid (0.68 g, 98%). LCMS (Method B): RT=2.98 min, M+H+=248. 1H NMR (400 MHz, DMSO-d6): 12.98 (s, 1H), 9.05 (d, J=1.0 Hz, 1H), 8.95 (d, J=1.0 Hz, 1H), 8.63 (d, J=5.3 Hz, 1H), 7.54 (d, J=5.3 Hz, 1H).

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