An efficient and novel electrochemical oxidative tandem cyclization of arylketones and benzylamines for the synthesis of 1,2,4-trisubstituted-(1H)-imidazoles has been developed under metal- and oxidant-free conditions. This direct C-N bond formation strategy, with a broad functional group tolerance, affords the desired imidazoles in moderate to excellent yields.
An electrochemical dehydrogenative [2 + 2 + 1] annulation used for the synthesis of imidazoles has been developed under undivided electrolytic conditions.
一种用于合成咪唑的电化学脱氢[2 + 2 + 1]环化反应已在不分隔电解条件下开发出来。
CuI/BF<sub>3</sub>·Et<sub>2</sub>O Cocatalyzed Aerobic Dehydrogenative Reactions of Ketones with Benzylamines: Facile Synthesis of Substituted Imidazoles
作者:Zhong-Jian Cai、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/ol302955u
日期:2012.12.7
A novel CuI/BF3·Et2O/O2-mediated reaction utilizing ketones and benzylamines for the construction of substituted imidazoles in one step under mild conditions has been demonstrated. This protocol involved the removal of eight hydrogen atoms, the functionalization of four C(sp3)–H bonds and three new C–N bond formations.
已经证明了在温和条件下一步一步利用酮和苄胺介导的新型CuI / BF 3 ·Et 2 O / O 2介导的反应,用于构建取代的咪唑。该协议涉及去除八个氢原子,四个C(sp 3)–H键的功能化和三个新的C–N键的形成。
Construction of substituted imidazoles from aryl methyl ketones and benzylamines via N-heterocyclic carbene-catalysis
synthetic strategy for the construction of substitutedimidazoles from acetophenones and benzylamines via N-heterocyclic carbene (NHC) - catalysis was reported. This reaction can be performed under solvent-free condition without pre-functionalization of substrates. Various substituted acetophenones and benzylamines were converted to its corresponding imidazoles with good to excellent yields.
A novel and practical method for the construction of 1,2,4-trisubstituted imidazoles with enamides and benzylamines catalysed by CuBr and I2 has been developed. This sustainable, simple and environmentally-friendly procedure tolerates various functional groups and affords a series of trisubstitued imidazoles.