Тип публикации: статья из журнала
Год издания: 2012
Идентификатор DOI: 10.1002/poc.2985
Ключевые слова: activation energy, aldol mimetics, DFT, potential energy surface, prolinamide, reaction mechanism, Activation energy, Aldol mimetics, DFT, Potential energy surface, Prolinamide, Reaction mechanism, DFT, Direct aldol reaction, Geometry optimization, Mimetics, Prolinamide, Quantum chemical studies, Reaction mechanism, Van Der Waals interactions, Acetone, Activation energy, Catalysis, Chemical bonds, Condensation reactions, Potential energy surfaces, Quantum chemistry, Stereochemistry, Van der Waals forces, Enantioselectivity
Аннотация: The direct aldol reaction between acetone and 4-nitrobenzaldehyde catalyzed by sterically hindered L-prolinamide derivative (64 atoms) of the (11S,12S)-9,10-dihydro-9,10-ethanoanthracene-11,12-diamine molecule has been investigated using density functional theory at the B3LYP/6-31G(d) level of theory. The reliability of the B3LYP/6-31G(d) calculations to elucidate the reaction mechanism and estimate activation and reaction energies was confirmed by energy calculation of the net reaction with full geometry optimizations of the reactants and product at the B3LYP/6-311++G(2d,2p) as well as B2PLYP/def2-TZVPP levels with correction to Van der Waals interaction. The calculations reveal that the L-prolinamide derivative catalyzes the reaction according to a multistep enamine mechanism with highly activated C-C bond and/or enamine formation in the proposed mechanism. The final elementary reaction - the C-N bond cleavage in the chiral diol adduct - is accompanied by a very large barrier, which may inhibit further progression of the reaction. The origin of the enantioselectivity and the corresponding reaction paths to a chiral product were unambiguously identified. Copyright (C) 2012 John Wiley & Sons, Ltd.
Журнал: JOURNAL OF PHYSICAL ORGANIC CHEMISTRY
Выпуск журнала: Vol. 25, Is. 11
Номера страниц: 971-978
ISSN журнала: 08943230
Место издания: HOBOKEN
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