Copper-Catalyzed Oxybromination and Oxychlorination of Primary Aromatic Amines Using LiBr or LiCl and Molecular Oxygen
作者:Luciano Menini、Joyce C. da Cruz Santos、Elena V. Gusevskaya
DOI:10.1002/adsc.200800223
日期:2008.9.5
Nuclear oxybromination of unprotected aromatic primary amines catalyzed by copper(II) acetate [Cu(OAc)2] under mild conditions has been developed, in which bromide ions are used as halogenating agents and dioxygen as a final oxidant. The catalyst shows not only high regioselectivity for para- or ortho-isomers but also a remarkable chemoselectivity for monobromination. Oxychlorination of aniline can
已经开发了在温和的条件下由乙酸铜(II)[Cu(OAc)2 ]催化的未保护的芳族伯胺的核氧溴化反应,其中溴离子用作卤化剂,双氧作为最终氧化剂。该催化剂不仅显示出对-或邻-异构体的高区域选择性,而且还显示出对单溴化的显着化学选择性。苯胺的氧氯化反应也可以在相似的条件下进行,尽管选择性较低,N-苯基乙酰胺是主要的副产物。这种简单的催化方法代表了从生态上良性和经济上有吸引力的合成途径,从而制得了昂贵的小批量芳族卤代胺。