Direct N-acylation of azoles via a metal-free catalyzed oxidative cross-coupling strategy
作者:Jingjing Zhao、Pan Li、Chungu Xia、Fuwei Li
DOI:10.1039/c4cc01587h
日期:——
The KI-catalyzed N-acylation of azoles via direct oxidative coupling of C–H and N–H bonds has been developed. It could be smoothly scaled up to gram synthesis of acyl azoles. The reaction occurred by the coupling of acyl radicals and azoles to form the acyl azole radical anion, followed by its further oxidation.
Chemoselective acylation of benzimidazoles with phenylacetic acids under different Cu catalysts to give fused five-membered N-heterocycles or tertiary amides
作者:Shaoyu Mai、Yingwei Zhao、Qiuling Song
DOI:10.1039/c6ob01167e
日期:——
bond formation via a copper-catalyzed aerobic oxidative decarboxylative tandem protocol was realized. The phenylacetic acids which contain ortho-X (X = F or Br) on the aromatic ring will render a fused five-membered heterocycle via a tandem aromatic nucleophilic substitution and aerobic oxidative decarboxylative acylation at the C(sp2)–H bond of benzimidazoles under the Cu(OAc)2/K2CO3/BF3·Et2O catalytic
通过铜催化的好氧氧化脱羧串联方案实现了C–N键的形成。在芳环上含有邻-X(X = F或Br)的苯乙酸将通过串联芳族亲核取代和苯并咪唑的C(sp 2)-H键上的好氧氧化脱羧酰化反应,形成稠合的五元杂环在Cu(OAc)2 / K 2 CO 3 / BF 3 ·Et 2 O催化体系下,以CuBr为催化剂,吡啶为碱,发生N-酰化反应,得到叔酰胺。