(4-Methoxyphenyl)boronic acid → 3-(4-methoxyphenyl)-1H-indazole

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-bromo-1H-indazole (0.20 g, 1.0 mmol), 4-methoxyphenylboronic acid (0.228 g, 1.5 mmol), and tetrakis(triphenylplhosphine)palladium(0) (0.228 g, 0.1 mmol) in ethylene glycol dimethyl ether (5 mL) and 2.0 M sodium carbonate solution (6 mL) under nitrogen was heated at 100° C. for 18 hours. It was quenched by water and extracted with chloroform. The extracts were dried over magnesium sulfate, filtered, and concentrated. The residue was then purified by chromatography (SiO2, 15–30% ethyl acetate/hexane) to provide the title compound (0.012 g, 5% yield): 1N NMR (CDCl3) δ 10.4 (br s, 1H), 8.01 (d, 1H), 7.92 (d, 2H), 7.46 (m, 2H), 7.22 (m, 1H), 7.06 (d, 2H), 3.89 (s, 3H); EI-MS (m/z) 224 [M]+.

Provenance & Evidence