5-Amino-2-chloro-4-fluorophenol → 7-Benzyloxy-4-(4-chloro-2-fluoro-5-hydroxyanilino)-6-methoxycinnoline

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A solution of 7-benzyloxy-4-chloro-6-methoxycinnoline hydrochloride (3.4 g, 10 mmol) and 4-chloro-2-fluoro-5-hydroxyaniline, (prepared as described in EP 061741 A2), (1.84 g, 11 mmol) in DMF (42 ml) was heated at 130° C. for 20 minutes. The resulting solid was filtered off, washed with isopropanol, ether and dried under vacuum to give 7-benzyloxy-4-(4-chloro-2-fluoro-5-hydroxyanilino)-6-methoxycinnoline as the hydrochloride salt (yellow solid. 3.5 g, 75%).

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