Water → 3-chloro-N-(diphenylmethylene)-4-(2-fluoro-4-nitrophenoxy)pyridin-2-amine

Participants

Reaction Conditions

Reaction Steps

To a 2-L Chem-Glass reactor was added the crude 3-chloro-2-(diphenylmethyleneamino)pyridin-4(1H)-one (from above, now in DMF) and cesium carbonate (300.52 g, 923 mmol) followed by the addition of 3,4-difluoronitrobenzene (118.15 mL, 1065 mmol). The mixture was heated to approximately 90° C. with stirring for 2 h. The mixture was cooled to 25° C. with stirring for 10 min. To this solution was added water (1 L). The mixture was extracted with EtOAc (1 L) and the aqueous phase was discarded. The organics were concentrated to afford an oil. The oil was dissolved into EtOH (200 mL) (heating sometimes required). After the solution was allowed to stand at 25° C. for 4 h, a solid was collected by filtration to afford 3-chloro-N-(diphenylmethylene)-4-(2-fluoro-4-nitrophenoxy)pyridin-2-amine (104.00 g; 32.73% yield) as a yellow solid. 1H NMR (CDCl3) δ 6.52 (d, 1 H, J=5.6 Hz), 6.80 (dd, 1 H, J=8.1, 9.1 Hz), 7.21-7.60 (m, 8 H), 7.78-7.95 (m, 2 H), 8.00 (m, 1 H), 8.11 (dd, 1 H, J=2.5, 9.6 Hz), 8.17 (d, 1 H, J=5.6 Hz); MS (ESI+) m/z 448.01 (M+H)+.

Provenance & Evidence