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 2N 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 1N NaOH (1 mL). The mixture was stirred for 30 minutes, acidified with 1N 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