Cesium carbonate → 5-Bromo-3-(5-(3-hydroxyazetidin-1-yl)pyridin-2-ylamino)-1-methylpyridin-2(1H)-one

Participants

Reaction Conditions

Reaction Steps

A sealed tube was equipped with a magnetic stirrer and charged with 128b (375 mg, 2.3 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (848 g, 3.2 mmol) and cesium carbonate (1.7 g, 5 mmol) in 1,4-dioxane (24 mL). After bubbling nitrogen through the solution for 30 min, Xantphos (160 mg, 0.3 mmol) and tris(dibenzylideneacetone) dipalladium(0) (150 mg, 0.2 mmol) were added, and the reaction mixture was heated to 100° C. for 5 days. After this time, H2O (20 mL) and EtOAc (20 mL) were added. The aqueous layer was separated and extracted with ethyl acetate (2×20 mL). The combined organic extracts were washed with brine (50 mL) and dried over sodium sulfate. The resulting residue was purified by column chromatography eluting with a gradient of CH2Cl2-9:1 CH2Cl2:MeOH to afford a 39% yield (430 mg) of 128c.

Provenance & Evidence