A simple and convenient method for direct α-chlorination of ketones with ammonium chloride and Oxone®
作者:Zhong Shi Zhou、Li Li、Xue Han He
DOI:10.1016/j.cclet.2012.09.014
日期:2012.11
Abstract When ketones were treated with ammonium chloride and Oxone ® in MeOH at room temperature, a direct α -chlorination of ketones was occurred and a series of the corresponding α -chloroketones were obtained in moderate to good yields after 24 h. In this reaction, ammonium chloride was used as the source of chlorine and Oxone ® was used as an oxidant. This method was simple, convenient and providing
A synthetic procedure, catalysed by Ir(ppy)3 under visible-light irradiation, for the chemodivergent synthesis of 2,3-dihydrofurans (3) or β,γ-unsaturated ketones (7) starting from α-halo ketones (1) and alkenes (2) has been developed. The mild reaction conditions and the redox-neutral nature of the process make it particularly sustainable avoiding the use of both sacrificial reactants and stoichiometric
Pseudohalogen chemistry. XI. Some aspects of the chemistry of α-thiocyanato-β-dicarbonyl compounds
作者:Elaine F. Atkins、Steven Dabbs、Robert G. Guy、Akbar A. Mahomed、Philip Mountford
DOI:10.1016/s0040-4020(01)85248-0
日期:1994.1
Enolised α-thiocyanato-β-dicarbonyl compounds dimerise in ethanol at room temperature to give tautomeric 4,5-disubstituted 2-amino- and 2-acetamido-thiazoles by a C-S-C + C-N cyclisation. Tautomerism is due to the unusual 4-(β-dicarbonyl-α-thio) substituent. Competing intramolecular cyclisations lead to minor amounts of heterocycles containing the thiazole and/or oxathiole ring systems
Lanthanide-Catalyzed Oxyfunctionalization of 1,3-Diketones, Acetoacetic Esters, And Malonates by Oxidative C–O Coupling with Malonyl Peroxides
作者:Alexander O. Terent’ev、Vera A. Vil’、Evgenii S. Gorlov、Gennady I. Nikishin、Kasimir K. Pivnitsky、Waldemar Adam
DOI:10.1021/acs.joc.5b02233
日期:2016.2.5
double C–O coupling products chemo-selectively in high yields with a broad substrate scope. The double C–O coupling products may be hydrolyzed to vicinaltricarbonyl compounds, which are otherwise cumbersome to prepare. Based on the present experimental results, a nucleophilic substitution mechanism is proposed for the C–O coupling process in which the lanthanide metal ion serves as Lewis acid to activate
Elemental fluorine, Part 23: Direct fluorination of β-ketoesters as an approach to enantioselective fluorination
作者:Richard D. Chambers、Takashi Nakano、Takashi Okazoe、Graham Sandford
DOI:10.1016/j.jfluchem.2009.06.003
日期:2009.9
Attempts to develop a direct enantioselective fluorination protocol using elementalfluorine and an appropriate Lewis acid and chiral ligand system are described.