Cesium carbonate → HCID 178493041, compound

Participants

Reaction Conditions

Reaction Steps

A sealed tube was equipped with a magnetic stirrer and charged with 5-methoxy-1H-pyrazol-3-amine (1.9 g, 17 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (4.9 g, 18 mmol) and cesium carbonate (12 g, 37 mmol) in 1,4-dioxane (160 mL). After bubbling nitrogen through the solution for 30 min, Xantphos (1.1 g, 2 mmol) and tris(dibenzylideneacetone) dipalladium(0) (1.1 g, 1.2 mmol) were added, and the reaction mixture was heated to 100° C. for 16 hours. After this time, H2O (50 mL) and EtOAc (50 mL) were added. The aqueous layer was separated and extracted with EtOAc (2×50 mL). The combined organic extracts were washed with brine (100 mL) and dried over sodium sulfate. The resulting solution was concentrated under reduced pressure to near dryness and the desired product fell out of solution. Filtering and washing with Et2O (10 mL) afforded 12% yield (590 mg) of crude 157a.

Provenance & Evidence