Mechanism of Hydrolysis and Structure–Stability Relationship of Enaminones as Potential Prodrugs of Model Primary Amines
作者:Vijay H. Naringrekar、Valentino J. Stella
DOI:10.1002/jps.2600790213
日期:1990.2
compound, suggesting that the rate-controlling step in the hydrolysis of the enaminones was the proton addition to the vinyl carbon of the enaminone. Enaminones formed with cyclic 1,3-dicarbonyl compounds were significantly more stable than those formed with structurally similar acyclic compounds. Based on chemical stability considerations alone, enaminones do not appear to be good candidates as prodrugs of
1,1,1-Trichloro-3-(1-phenethylamino-ethylidene)- pentane-2,4-dione—synthesis, spectroscopic, theoretical and structural elucidation
作者:Tsonko M. Kolev、Plamen Angelov
DOI:10.1002/poc.1266
日期:2007.12
1,1,1-Trichloro-3-(1-phenethylamino-ethylidene)-pentane-2,4-dione is spectroscopically and structurally elucidated by means of linear-polarized IR spectroscopy (IR-LD) of oriented solids as a colloidal suspension in nematic liquid crystal. Structural information and IR-spectroscopic assignment are supported by quantum chemical calculations at MP2 and B3LYP level of theory and 6-311++G** basis set.
A simple protocol for the preparation of β-enamino ketones catalyzed by NbOPO4 under solvent free conditions
作者:Felipe Wodtke、Fernando R. Xavier、Samuel R. Mendes、Alfredo R.M. de Oliveira、Rogério A. Gariani
DOI:10.1016/j.tetlet.2016.12.019
日期:2017.1
A novel application of the highly stable niobium oxide phosphate (NbOPO4) as an efficient catalyst for the synthesis of beta-enamino ketones under solvent-free conditions is described. This protocol, exhibits attractive yields, short reaction periods, lower loading of catalyst and high chemoselectivity. (C) 2016 Elsevier Ltd. All rights reserved.
Phosphotungstic Acid Catalysed Synthesis of β-Enamino Compounds under Solvent-Free Conditions
作者:Geng-Chen Li
DOI:10.3184/030823407x273488
日期:2007.12
developed for the synthesis of β-enaminones and β-enamino esters by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of phosphotungstic acid (H3PW12O40, 1 mol%). The reaction proceeds smoothly at room temperature under solvent-free conditions and gives the corresponding β-enamino compounds in high to excellent yields.
A convenient procedure for modification of β-enaminones by α-C-acylation and subsequent acidic cleavage is described. The unsymmetrical β-enamino ketones obtained in this way could be hydrolyzed to provide an entry towards various unsymmetrical 1,3-diketones.