使用叔丁基氢过氧化物(TBHP)进行的钯与醛的有效CH酰化CH酰化反应可在温和条件下(40°C,3 h)将各种酸酐转化为合成有用的2-氨基二苯甲酮衍生物。酰化反应显示出优异的区域选择性和官能团耐受性,简单的芳族醛,官能化的脂族醛和杂芳族醛是有效的偶联伙伴。酰化反应可能是通过限速亲电CH环钯反应(k H / k D = 3.6;ρ + = -0.74)引发,形成芳基钯配合物,然后进行酰基自由基官能化。
A Meta-Selective Copper-Catalyzed C–H Bond Arylation
作者:Robert J. Phipps、Matthew J. Gaunt
DOI:10.1126/science.1169975
日期:2009.3.20
For over a century, chemical transformations of benzenederivatives have been guided by the high selectivity for electrophilic attack at the ortho/para positions in electron-rich substrates and at the meta position in electron-deficient molecules. We have developed a copper-catalyzed arylation reaction that, in contrast, selectively substitutes phenyl electrophiles at the aromatic carbon–hydrogen sites