Potassium Carbonate → 3-tert-butyl-1-(2-methoxy-6-methylphenyl)-4-methyl-1H-pyrazol-5-amine

関与物質

反応条件

反応手順

To a solution of 4-bromo-3-tert-butyl-1-(2-methoxy-6-methylphenyl)-1H-pyrazol-5-amine (2.6 g, 7.68 mmol) in DMF (15 mL) was added methylboroxine (6.66 mL, 46.08 mmol), [1,1′-bis(diphenylphosphino)-butane]palladium (II) dichloride (481.97 mg, 0.80 mmol), and potassium carbonate (3.3 g, 23.04 mmol). The reaction mixture was stirred for 18 h at 155° C. The reaction was diluted with water (100 mL) and extracted with EtOAc (3×25 mL). The combined organic extracts were washed with brine, dried (Na2SO4), and concentrated under reduced pressure. The residue was purified by silica gel chromatography using 90% hexane/EtOAc, to afford the product (1.7 g, 77%) as a pure white solid. 1H NMR (300 MHz, DMSO-d6) δ 1.24 (s, 9H), 1.96 (s, 3H), 1.99 (s, 3H), 3.71 (s, 3H), 4.25 (s, 2H), 6.85 (d, 1H), 6.94 (d, 1H), 7.23-7.29 (m, 1H). ES-MS m/z 274.2 (MH+); HPLC RT (min.) 1.78.

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