反应详情

Employing the same general procedure as for the preparation of 5-bromo-2-tert-butyl-1-[(2′-amino-4′-methyl)phenoxy]benzene (Compound I), 781 mg (3.4 mmol) of 5-bromo-2-tert-butylphenol (Compound H) was converted into crude 5-bromo-2-tert-butyl-1[-4′-ethyl-2′-nitro)phenoxy]benzene using 611 mg (5.0 mmol) of potassium t-butoxide, 1.0 g (5.25 mmol) of cuprous iodide, 770 mg (˜2.78 mmol) of 1-bromo-4-ethyl-2-nitrobenzene (˜80% purity, obtained from the nitration of 1-bromo-4-ethylbenzene) and 10 mL of pyridine. Purification by flash chromatography (silica, 5% ethyl acetate in hexane) gave crude 5-bromo-2-tert-butyl-1-[(4′-methyl-2′-nitro)phenoxy]benzene as a yellow oil. 290 mg of this crude sample was converted into the title compound using a balloon filled with hydrogen, 31 mg of 10% Pd/C, 4 mL of acetonitrile and 1 mL of methanol. Purification by flash chromatography (silica, 2% ethyl acetate in hexane) gave the title compound as a yellow oil.