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Igor A. Ushakov
Researcher at Russian Academy of Sciences
Publications - 490
Citations - 3706
Igor A. Ushakov is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Yield (chemistry) & Pyrrole. The author has an hindex of 25, co-authored 453 publications receiving 3201 citations. Previous affiliations of Igor A. Ushakov include Moscow State University & St. Petersburg State University of Telecommunications.
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Ethynylation of pyrroles with 1-acyl-2-bromoacetylenes on alumina: a formal ‘inverse Sonogashira coupling’
Boris A. Trofimov,Zinaida V. Stepanova,Lyubov N. Sobenina,Al'bina I. Mikhaleva,Igor A. Ushakov +4 more
TL;DR: Pyrroles are cross-coupled with 1-acyl-2-bromoacetylenes on the surface of Al 2 O 3 at room temperature under solvent-free conditions to afford 2-(acylethynyl)pyrrole with 100% regioselectivity and in good yields as discussed by the authors.
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Transition-Metal-Free Superbase-Promoted Stereoselective α-Vinylation of Ketones with Arylacetylenes: A General Strategy for Synthesis of β,γ-Unsaturated Ketones
TL;DR: A wide variety of β,γ-unsaturated ketones of E configuration have been obtained in good to excellent yields via KO(t)Bu/DMSO promoted α-vinylation of aliphatic, cycloaliphatic and alkyl aromatic (heteroaromatic) ketones with diverse arylacetylenes.
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General Route to Symmetric and Asymmetric meso-CF3-3(5)-Aryl(hetaryl)- and 3,5-Diaryl(dihetaryl)-BODIPY Dyes
Lubov N. Sobenina,Alexander M. Vasil'tsov,Olga V. Petrova,Konstantin B. Petrushenko,Igor A. Ushakov,Gilles Clavier,Rachel Méallet-Renault,Al'bina I. Mikhaleva,Boris A. Trofimov +8 more
TL;DR: A general efficient route to hitherto inaccessible symmetric and asymmetric meso-CF(3)-BODIPy dyes has been developed and allows the BODIPY with 3(5)aryl(het Daryl) and 3,5-diaryl(hetaryl) substituents to be readily assembled.
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Base‐Catalyzed Stereoselective Vinylation of Ketones with Arylacetylenes: A New C(sp3)C(sp2) Bond‐Forming Reaction
Boris A. Trofimov,Elena Yu. Schmidt,Igor A. Ushakov,Nadezhda V. Zorina,Elena V. Skital'tseva,Nadezhda I. Protsuk,Al'bina I. Mikhaleva +6 more
TL;DR: Alkylaryl- and alkylheteroarylketones, including those with condensed aromatic moieties, are readily vinylated with arylacetylenes to give regio- and stereoselectively the (E)-beta-gamma-ethylenic ketones ((E)-3-buten-1-ones) in 61-84% yields and with approximately 100% stereoselectedivity.
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Selective, Metal-Free Approach to 3- or 5-CF3-Pyrazoles: Solvent Switchable Reaction of CF3-Ynones with Hydrazines
Vasiliy M. Muzalevskiy,Alexander Yu. Rulev,Alexey R. Romanov,Evgeniy V. Kondrashov,Igor A. Ushakov,Vyacheslav A. Chertkov,Valentine G. Nenajdenko +6 more
TL;DR: A detailed study of the reaction of trifluoroacetylated acetylenes and aryl (alkyl) hydrazines was performed, aimed to the regioselective synthesis of 3- or 5-trifluoromethylated pyrazoles, and it was found that the reguoselectivity of reaction depends dramatically on the solvent nature.