Regioselectivity Issues in the Addition of Grignard Reagents to Trifluoromethylated α-Bromoenones
作者:Alexey R. Romanov、Dominique Cahard、Alexander Yu. Rulev
DOI:10.1002/ejoc.201900155
日期:2019.3.21
α‐bromoenones their fluorinated analogs react with alkyl and arylmagnesium bromides leading to saturated CF3‐ketones as major reaction adducts. The regioselectivity of addition depends strongly on the nature of the Grignardreagent.
Reaction of Bromoenones with Amidines: A Simple Catalyst-Free Approach to Trifluoromethylated Pyrimidines
作者:Alexander Yu. Rulev、Alexey R. Romanov、Alexander V. Popov、Evgeniy V. Kondrashov、Sergey V. Zinchenko
DOI:10.1055/s-0040-1707969
日期:2020.5
one-pot synthesis of trifluoromethylated pyrimidines has been achieved by the treatment of fluorinated 2-bromoenones with aryl- and alkylamidines. The assembly of pyrimidine core proceeds by the cascade reactions via aza-Michael addition–intramolecular cyclization–dehydrohalogenation/dehydration sequence. This strategy is featured by high selectivity and mild reaction conditions giving the target heterocycles
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.