A Remarkably Efficient Phase-Transfer Catalyzed Amination of α-Bromo-α, β-Unsaturated Ketones in Water
作者:Alemayehu Mekonnen、Alemu Tesfaye
DOI:10.1155/2021/6616458
日期:2021.1.4
10 mol% of phase-transfer, PT catalysts in water. Some chiralquaternaryammonium salts derived from Cinchona alkaloids were investigated as water-stable PT catalysts. The scope and limitations of the reaction have also been investigated. The catalytic performances were significantly improved in comparison with the corresponding ordinary quaternaryammoniumsaltcatalysts, and excellent yields (81%–96%)
In this Letter, the alpha-fluoro-beta-amino acid directives were elegantly generated via a novel strategy of the nucleophilic addition of arynes and aziridines. C-N bonds were successfully constructed with high efficiency. With the utilization of TABF hydrate as the fluorinated reagent, fluorine atom could be assembled into the target molecule selectively. Interestingly, under another condition, unexpected indole spiro-derivatives could be achieved successfully. (C) 2014 Elsevier Ltd. All rights reserved.