反应详情

温度

125 °C

A stirred mixture of 5-(3-bromo-5-methoxyphenyl)benzofurazan (2.44 g, 8 mmol), 6 (trimethylstannyl)imidazol[1,2-a]pyridine (2.2 g, 7.9 mmol), triphenylphosphine (336 mg, 1.28 mmol), and bis(dibenzylidineacetone)palladium(0) (186 mg, 0.32 mmol) in dimethylformamide (60 mL) is heated at 125° C. under an argon atmosphere for 36 h. The solvent is evaporated off under reduced pressure to yield a crude product which is purified by chromatography (silica gel, 95% ethyl acetate/4.5% ethanol/0.5% aqueous NH3 (25%)) and recrystallised from ethyl acetate-t-butylmethyl ether to give 6-[4-methoxy-3-(5-benzofurazanyl)phenyl]imidazo[1,2-a]pyridine as a pale-yellow crystalline solid, m.p. 190-196° C.

1. customThe solvent is evaporated off under reduced pressure
2. customto yield a crude product which
3. customis purified by chromatography (silica gel, 95% ethyl acetate/4.5% ethanol/0.5% aqueous NH3 (25%))
4. customrecrystallised from ethyl acetate-t-butylmethyl ether