Ullmann Diaryl Ether Synthesis: Rate Acceleration by 2,2,6,6-Tetramethylheptane-3,5-dione
作者:Elizabeth Buck、Zhiguo Jake Song、David Tschaen、Peter G. Dormer、R. P. Volante、Paul J. Reider
DOI:10.1021/ol025839t
日期:2002.5.1
[reaction: see text]. In the copper salt catalyzed ether formation from aryl bromides or iodides and phenols, 2,2,6,6-tetramethylheptane-3,5-dione (TMHD) was found to greatly accelerate the ordinarily difficult reaction, making it occur under more moderate temperatures and reaction times. A series of aryl halides and phenols were shown to form ethers in NMP as the solvent, cesium carbonate as the base
[反应:请参见文字]。在由芳基溴化物或碘化物和苯酚形成的铜盐催化的醚形成中,发现2,2,6,6-四甲基庚烷-3,5-二酮(TMHD)极大地促进了通常困难的反应,使其在更温和的温度下发生和反应时间。一系列芳基卤化物和苯酚显示在NMP中作为溶剂,碳酸铯作为碱,CuCl和TMHD作为催化剂形成醚。该反应被证明可以耐受富电子的芳基溴化物和电子中性苯酚。