Method for preparing diphenyl ether compound
A kind of compound, technology of diphenyl ether, applied in the field of preparation of diphenyl ether compounds
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Embodiment 1
[0017] Embodiment one: a kind of method for preparing 4,4'-diacetyl biphenyl ether, comprises the following processing steps:
[0018] Add p-fluoroacetophenone (6.90mg, 0.05mmol), pinacol diborate (20.32mg, 0.08mmol), copper chloride (0.34mg, 5%*0.05mmol), 1,2 - Bis(diphenylphosphine)ethane (3.98mg, 20%*0.05mmol), cesium carbonate (6.52mg, 40%*0.05mmol). Add the reaction solvent DMF, the reaction temperature is 150°C, the reaction time is 20h, the yellow solution produced is dissolved in water, and then extracted with ethyl acetate, the solution of the ethyl acetate layer is retained, suspended to dryness, and then separated with a 200-300 mesh silica gel column (washing Deagent is ethyl acetate / normal hexane of 1: 2), after removing solvent, obtain 4,4'-diacetyl biphenyl ether, structural formula is:
[0019] Yield 68%, melting point: 98-100°C.
Embodiment 2
[0020] Embodiment two: a kind of method for preparing 4,4'-dicyanodiphenyl ether comprises the following processing steps:
[0021] Add p-fluorobenzonitrile (6.06mg, 0.05mmol), biboronic acid pinacol ester (12.7mg, 0.05mmol), aluminum chloride (0.68mg, 10%*0.05mmol), 1,2- Bis(diphenylphosphine)ethane (9.95mg, 50%*0.05mmol), cesium carbonate (6.52mg, 40%*0.05mmol). Add the reaction solvent DMF, the reaction temperature is 80°C, and the reaction time is 24 hours. Dissolve the light yellow solution with water, then extract it with ethyl acetate, keep the solution of the ethyl acetate layer, hang it to dryness, and then separate it with a 200-300 mesh silica gel column ( Eluent is 2: 3 dichloromethane / n-hexane), after removing solvent, obtain 4,4'-dicyanodiphenyl ether, structural formula is:
[0022] Yield: 92%. Melting point: 182°C.
Embodiment 3
[0023] Embodiment three: a kind of method for preparing 4-nitro-4'-aminodiphenyl ether comprises the following processing steps:
[0024] Add p-fluoronitrobenzene (7.06mg, 0.05mmol), pinacol diborate (22.86mg, 0.09mmol), copper chloride (0.68mg, 10%*0.05mmol), 1,2 - Bis(diphenylphosphine)ethane (3.98mg, 20%*0.05mmol), cesium carbonate (6.52mg, 40%*0.05mmol). Add the reaction solvent DMF, the reaction temperature is 45°C, the reaction time is 15h, the dark brown solution produced is dissolved in water, and then extracted with ethyl acetate, the solution of the ethyl acetate layer is retained, suspended to dryness, and then separated with a 200-300 mesh silica gel column ( Eluent is 1: 1 dichloromethane / n-hexane), after removing solvent, obtain 4-nitro-4'-aminodiphenyl ether, structural formula is:
[0025] The yield was 84%. Melting point: 132-133°C.
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