Potassium Carbonate → 6-Chloro-5-(4-(2-hydroxypropan-2-yl)phenyl)-1H-indazole-3-carboxylic acid

Participants

Reaction Steps

To a mixture of 5-bromo-6-chloro-1H-indazole-3-carboxylic acid (100 mg, 0.36 mmol) and 2-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-propan-2-ol (114 mg, 0.44 mmol) in toluene (1.5 mL) and EtOH (1.5 mL) was added 2 N aqueous potassium carbonate solution (0.7 mL, 1.4 mmol). The reaction mixture was degassed with N2 for 10 minutes, treated with [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) (15.0 mg, 0.018 mmol), and heated to reflux for 16 hours. After cooling to room temperature, the reaction was quenched with 1 N NaOH (1 mL). The mixture was stirred for 30 minutes, acidified with 1 N HCl to pH 5 and extracted with EtOAc. The organic layer was washed with brine, dried over Na2SO4 and concentrated in vacuo. The crude material was purified by reverse phase chromatography (Biotage C18 column, 0-40% MeCN/water) to give the title compound (42 mg, 35% yield) as a solid. MS (ES−) 329.1 (M−H)+. 1H NMR (400 MHz, CD3OD) δ 8.06 (s, 1H), 7.74 (s, 1H), 7.55 (d, J=8.20 Hz, 2H), 7.37 (d, J=8.20 Hz, 2H), 1.57 (s, 6H).

Provenance & Evidence