A palladium-catalyzed oxidative C–H bond functionalization/ortho-acylation of acetanilides using easily accessible aldehyde as the acyl source is described. In the presence of a Pd(TFA)2 catalyst and tert-butylhydroperoxide at 90 °C in general, an array of ortho-acylacetanilides can be afforded in good yields.
Palladium(II)-Catalyzed Direct ortho-CH Acylation of Anilides by Oxidative Cross-Coupling with Aldehydes using tert-Butyl Hydroperoxide as Oxidant
作者:Chun-Wo Chan、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1002/adsc.201100472
日期:2011.11
An efficient palladium-catalyzed CH acylation with aldehydes using tert-butyl hydroperoxide (TBHP) transforms various anilides into synthetically useful 2-aminobenzophenone derivatives undermildconditions (40 °C, 3 h). The acylation reaction exhibits excellent regioselectivity and functional group tolerance, and simple aromatic aldehydes, functionalized aliphatic aldehydes and heteroaromatic aldehydes
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。
Toluene derivatives as simple coupling precursors for cascade palladium-catalyzed oxidative C–H bond acylation of acetanilides
作者:Yinuo Wu、Pui Ying Choy、Fei Mao、Fuk Yee Kwong
DOI:10.1039/c2cc37352a
日期:——
A palladium-catalyzed cascade cross-coupling of acetanilide and toluene for the synthesis of ortho-acylacetanilide is described. Toluene derivatives can act as effective acyl precursors (upon sp(3)-C-H bond oxidation by a Pd/TBHP system) in the oxidative coupling between two C-H bonds. This dehydrogenative Pd-catalyzed ortho-acylation proceeds under mild reaction conditions.