Electrochemical Oxidative Cyclization: Synthesis of Polysubstituted Pyrrole from Enamines
作者:Zhiwei Chen、Guang Shi、Wei Tang、Jie Sun、Wenxing Wang
DOI:10.1002/ejoc.202001484
日期:2021.2.12
Diverse polysubstituted pyrroles were synthesized through electrochemical oxidative cyclization of enamines under mild conditions. By avoiding the use of metal catalysts and oxidants, this method is both more environmentally friendly and atomic economic than other synthetic protocols.
A novel and efficient method for the synthesis of α-cyanomethyl-β-dicarbonyls in moderate to excellent yields is developed by using inactive CH3CN and simple 1,3-dicarbonyls. A radical mechanism is proposed under the ESI-MS (electrospray ionization mass spectrometry) analysis results of control experiments.
Visible-light-induced α-oxyamination of 1,3-dicarbonyls with TEMPO <i>via</i> a photo(electro)catalytic process applying a DSSC anode or in a DSSC system
enviromentally friendly photoelectrocatalytic one-pot method was developed for the α-oxyamination between 1,3-dicarbonyls and TEMPO via a photo(electro)catalytic process using visible light as the energy source. The recovered DSSC anode (photocatalyst) could be used more than 8 times, at the same time, the α-oxyamination reaction proceeding in the DSSC device might be involved in the photoelectrocatalysis
An efficient route for the synthesis of N-(1H-benzo[d]imidazol-2-yl)benzamide derivatives promoted by CBr4 in one pot
作者:Caixia Xie、Songhua Li、Yunyi Li、Chen Ma
DOI:10.1016/j.tet.2020.130977
日期:2020.2
A metal-free one-pot method for the synthesis of N-(1H-benzo[d]imidazol-2-yl)benzamide derivatives was proposed mediated by CBr4. The reaction went through ring formation and opening processes with only two protons leaving and the thermodynamically favorable products were selectively formed in moderate to good yields.
提出了一种无金属一锅法,由CBr 4介导合成N-(1 H-苯并[ d ]咪唑-2-基)苯甲酰胺衍生物。该反应经历了环形成和打开过程,仅留下两个质子,并且以中等至良好的产率选择性地形成了热力学有利的产物。
A formal [3 + 3] cycloaddition of allenyl imide and activated ketones for the synthesis of tetrasubstituted 2-pyrones
CsOH·H2O-catalyzed formal [3 + 3] cycloadditions of allenyl imide with β-ketoesters, 1,3-diketones or β-ketonitriles for the synthesis of tetrasubstituted 2-pyrone derivatives have been demonstrated. The allenyl imide was utilized as a C3-synthon, and a ketenyl intermediate was proposed via the process of 1,4-addition of carbon anion to allene followed by elimination of the 2-oxazolidinyl group.