Cesium carbonate → HCID 58044188, compound

Participants

Reaction Conditions

Reaction Steps

A 100-mL three-neck round-bottomed flask equipped with a magnetic stirrer, nitrogen inlet and reflux condenser was charged with 3,5-dibromo-1-methylpyridin-2(1H)-one (536 mg, 2.01 mmol), tert-butyl 7-amino-3,4-dihydro-2,6-naphthyridine-2(1H)-carboxylate (500 mg, 2.01 mmol), cesium carbonate (1.44 g, 4.40 mmol) and 1,4-dioxane (30 mL). After bubbling nitrogen through the resulting mixture for 20 minutes, Xantphos (98.4 mg, 0.170 mmol) and tris(dibenzylideneacetone)dipalladium(0) (91.6 mg, 0.100 mmol) were added, and the reaction mixture was heated at 100° C. for 6 h. After this time, the reaction was cooled to room temperature, filtered and concentrated under reduced pressure. The resulting residue was purified by flash chromatography to afford a 96% yield (840 mg) of 226a as a yellow solid: mp 126-128° C.; 1H NMR (500 MHz, CDCl3) d 8.60 (d, 1H, J=2.5 Hz), 8.10 (s, 1H), 7.79 (s, 1H), 6.95 (d, 1H, J=2.5 Hz), 6.55 (s, 1H), 4.53 (s, 2H), 3.64 (t, 2H, J=5.0 Hz), 3.59 (s, 3H), 2.77 (t, 2H, J=5.0 Hz), 1.49 (s, 9H); MS (ESI+) m/z 435.0 (M+H).

Provenance & Evidence