Aqueous CO2 fixation: construction of pyridine skeletons in cooperation with ammonium cations. Issue 20 (27th September 2021)

• Record Type: Journal Article
• Authors: Xiang, Shiqun; Fan, Weibin; Zhang, Wei; Li, Yinghua; Guo, Shiwei; Huang, Deguang
• Is Part Of: Green chemistry. Volume 23:Issue 20(2021)
• Page Start: 7950
• Page End: 7955
• Publication Date: 2021-09-27
• Subjects: Environmental chemistry -- Industrial applications -- Periodicals; Environmental management -- Periodicals; 660
• DOI: 10.1039/d1gc02303a
• Languages: English
• ISSNs: 1463-9262

Abstract

Abstract : A method is explored for the construction of pyridine skeletons by [2 + 2 + 1 + 1] the cycloaddition of ketones with ammonium cation under a CO2 atmosphere. Water was applied as an environmentally friendly solvent. Abstract : A simple and green method is explored for the synthesis of fused pyridines by [2 + 2 + 1 + 1] the cycloaddition of ketones with an ammonium cation under a CO2 atmosphere. The reactions employed ammonium cation as a nitrogen source and CO2 gas as a carbon source in an aqueous solution. Monoethanolamine (MEA) was used as an additive to increase the solubility of CO2 in an aqueous solution. The scope and versatility of the method are demonstrated with 38 examples. Products are found to be photosensitive and show potential applications as organic optoelectronic materials. A selectfluor-promoted reaction mechanism is proposed based on the experimental studies. Our work is superior as it is a metal-free system, uses CO2 as a carbon source and MEA as an additive in aqueous synthesis.