Cesium carbonate → Darigabat

Participants

Reaction Conditions

Reaction Steps

A stirred solution of 7-ethyl-4-(4-fluoro-3-iodophenyl)-7H-imidazo[4,5-c]pyridazine (Preparation 10, 100 mg, 0.27 mmol), 2-(4-ethylsulfonyl-2-methoxyphenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (Preparation 21, 88 mg, 0.27 mmol) and cesium carbonate (177 mg, 0.54 mmol) in dioxane (5 mL) and water (1 mL) was degassed with argon for 10 minutes followed by the addition of 1,1′-bis(di-tert-butylphosphino) ferrocene palladium dichloride (4.4 mg, 0.005 mmol). The resulting mixture was heated at 100° C. for 16 hours, cooled to room temperature and diluted with EtOAc (15 mL). The organic layer was washed with water (10 mL) and saturated brine solution (10 mL) then dried over Na2SO4, filtered and concentrated in vacuo. Purification by silica gel column chromatography eluting with CH2Cl2:MeOH 98:2 afforded the title compound as off white solid in 13% yield, 15 mg.

Provenance & Evidence