2,4-Dichloropyridine → 4-(2-Chloro-pyridin-4-yloxy)-2,3-difluorophenylamine

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Reaction Steps

4-amino-2,3-difluorophenol (6 g, 41.4 mmol) and potassium tert-butoxide (4.9 g, 43.5 mmol) were suspended in DMAc (200 mL) and stirred at RT for 30 min under Ar atmosphere. 2,4-Dichloropyridine (6.1 g, 41.4 mmol) was added, and the resulting mixture was heated at 70° C. for 8 h. The reaction mixture was filtered, concentrated in vacuo and purified by silica gel chromatography to afford 4-(2-chloro-pyridin-4-yloxy)-2,3-difluoro-phenylamine (7 g, 66% yield). 1H NMR (400 MHz, DMSO-d6): δ 8.27 (d, J=6.0 Hz, 1 H), 7.05 (s, 1 H), 6.95 (m, 1 H), 6.92 (m, 1 H), 6.62 (m, 1 H), 5.60 (s, 2 H); MS (ESI) m/z: 257.1[M+H]+.

Provenance & Evidence