Visible Light as a Sole Requirement for Intramolecular C(sp<sup>3</sup>)–H Imination
作者:Jingjing Li、Pengxiang Zhang、Min Jiang、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1021/acs.orglett.7b00533
日期:2017.4.21
A novel, simple, and practical visible-light-mediated intramolecular α-C(sp3)–H imination of tertiaryaliphaticamines containing β-O-aryl oximes leading to N-heterocycles has been developed. The reaction was performed well at rt with tolerance of some functional groups. Importantly, the selective C–H functionalization did not require added catalyst, oxidant, additive, acid, and base; visible light
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.
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.
Elemental Sulfur-Promoted Aerobic Cyclization of Ketones and Aliphatic Amines for Synthesis of Tetrasubstituted Imidazoles
作者:Xiangui Chen、Zhen Wang、Huawen Huang、Guo-Jun Deng
DOI:10.1002/adsc.201800765
日期:2018.10.18
Elementalsulfur‐promoted cyclization for the one‐pot synthesis of tetra‐substituted imidazoles from benzylamines and ketones is described. Elementalsulfur combined with molecular oxygen as the benign co‐oxidant was found to be the key for the high efficiency of this transformation under metal‐free conditions. A range of tetrasubstituted imidazoles were synthesizedfrom simple ketones and amines with