Domino Transformations of<i>gem-</i>Trifluoroacetyl(bromo)alkenes under the Action of Secondary Amines
作者:Alexander Yu. Rulev、Igor A. Uchakov、Valentin G. Nenajdenko、Elisabeth S. Balenkova、Mikhail G. Voronkov
DOI:10.1002/ejoc.200700606
日期:2007.12
underwent aza-Michael/hydroxyalkylation domino reactions triggered by secondaryamines to give unexpectedly 2-amino-1-trifluoromethyl indenols in good yields. The process was found to involve the intermediate formation of captodative aminoalkenes. Treatment of 2-bromo-3-thienyl derivatives with the same nucleophiles afforded the captodative trifluoroacetyl(amino)alkenes. The indenols obtained in this reaction
Stereoelectronic structure of α-bromoalkenyl trifluoromethyl ketones
作者:N. N. Chipanina、T. N. Aksamentova、A. Yu. Rulev
DOI:10.1134/s1070428009100017
日期:2009.10
The results of quantum-chemical calculations at the B3LYP/6-311G** level of theory showed that (Z)-alpha-bromo-beta-arylalkenyl trifluoromethyl ketones are more stable than the corresponding E isomers by 4-5 kcal/mol. Relatively large positive charge on the olefinic beta-carbon atom and strong polarization of the C=C bond in both Z-s-cis and Z-s-trans conformers makes bromoalkenyl trifluoromethyl ketones the most potent Michael acceptors among alpha,beta-unsaturated carbonyl compounds. The calculated data are very consistent with the experimental IR spectra.