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In a 100 mL round-bottomed flask fitted with a condenser, 4-chloro-6-fluoro-1,7-naphthyridine-3-carbonitrile (0.250 g, 1.20 mmol) and 3-phenoxyaniline (0.245 g, 1.32 mmol) were taken up in 20 mL 2-ethoxyethanol and heated at reflux for 1 hour, until TLC analysis (20% EtOAc in hexanes) showed complete disappearance of the 4-chloronaphthyridine. After cooling to room temperature, the reaction mixture was partitioned between 40 mL each EtOAc and 5% Na2CO3. The aqueous layer was extracted twice more with EtOAc, and the combined organic layers washed three times with brine, dried over anhydrous MgSO4, filtered, and evaporated to give 6-fluoro-4-(3-phenoxyphenylamino)-1,7-naphthyridine-3-carbonitrile as a brown oil of sufficient purity to be used directly in the next step: 1H NMR (400 MHz, DMSO-D6) δ 6.94-7.18 (m, 6 H) 7.33-7.51 (m, 3 H) 8.15 (s, 1 H) 8.68 (s, 1 H) 9.05 (s, 1 H) 10.12 (s, 1 H).

1. customIn a 100 mL round-bottomed flask fitted with a condenser
2. temperatureheated
3. customthe reaction mixture was partitioned between 40 mL each EtOAc and 5% Na2CO3
4. extractionThe aqueous layer was extracted twice more with EtOAc
5. washthe combined organic layers washed three times with brine
6. dry with materialdried over anhydrous MgSO4
7. filtrationfiltered
8. customevaporated