Potassium Carbonate → 1-(5-Chloro-2-hydroxy-4-methyl-3-pyridin-4-ylphenyl)ethanone

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(3-bromo-5-chloro-2-hydroxy-4-methylphenyl)ethanone (2.6 g, 9.9 mmol), 4-pyridinylboronic acid (1.6 g, 13 mmol), and potassium carbonate (5.5 g, 40 mmol) in 1,2-dimethoxyethane (48 mL) and water (24 mL) was degassed with nitrogen and treated with triphenylphosphine (260 mg, 0.99 mmol) and palladium acetate (0.22 g, 0.99 mmol). The reaction mixture was degassed with nitrogen for 5 min and heated at 90° C. for 20 hours. The reaction mixture was cooled to room temperature, concentrated to remove most of the DME, diluted with ethyl acetate (200 ml) and water (100 ml), and filtered over celite. The aqueous layer was separated and extracted with ethyl acetate (100 mL). The combined organic layers were washed with brine (100 ml), dried over sodium sulfate, filtered, and concentrated to a crude brown foam. Purification by flash column chromatography using ethyl acetate in hexanes (0%-60%) gave the desired product (1.2 g, 45%). LCMS for C14H13ClNO2 (M+H)+: m/z=262.1. Found: 262.0.

Provenance & Evidence