Sodium Carbonate → 4-(2-(1H-pyrazol-4-yl)pyridin-4-yloxy)-3-fluoroaniline

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(2-chloropyridin-4-yloxy)-3-fluoroaniline (3.0 g, 12.6 mmol, from Example A2) in a solvent comprised of toluene/ethanol/water (4:4:1, 50 mL) was added 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (3.17 g, 16.4 mmol), sodium carbonate (4.01 g, 37.8 mmol) and tetrakis(triphenylphosphine)palladium (0.73 g, 0.63 mmol). The headspace was evacuated and back-filled with nitrogen (3×) and then the reaction mixture was heated to 100° C. overnight. The reaction was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/petroleum ether) to give 4-(2-(1H-pyrazol-4-yl)pyridin-4-yloxy)-3-fluoroaniline (2.66 g, 78% yield). 1H NMR (400 MHz, DMSO-d6): δ 13.03 (brs, 1H), 8.28-8.31 (m, 2H), 7.99 (s, 1H), 7.24 (s, 1H), 6.95-7.00 (m, 1H), 6.39-6.50 (m, 3H), 5.43 (brs, 2H); MS (ESI): m/z 271.1 [M+H]+.

Provenance & Evidence