REAL

Mukaiyama-michael reactions with trans-2,5-diarylpyrrolidine catalysts: Enantioselectivity arises from attractive noncovalent interactions, not from steric hindrance

Kemppainen, Eeva K. and Sahoo, Gokarneswar and Piisola, Anttii and Hamza, Andrea and Kótai, Bianka and Pápai, Imre (2014) Mukaiyama-michael reactions with trans-2,5-diarylpyrrolidine catalysts: Enantioselectivity arises from attractive noncovalent interactions, not from steric hindrance. CHEMISTRY-A EUROPEAN JOURNAL, 20. pp. 5983-5993. ISSN 0947-6539

[img] Text
MM_paper_20131022_final.pdf
Restricted to Registered users only

Download (1MB) | Request a copy

Abstract

The scope of the enantioselective Mukaiyama-Michael reactions catalyzed by trans-2,5-diphenylpyrrolidine has been expanded to include both α- and β-substituted enals. However, the rationalization of the observed enantioselectivity is far from obvious since the catalyst is not very sterically hindered. DFT calculations were carried out to rationalize the observed stereoselectivities. Transition states of the C-C bond formation between iminium intermediates and silyloxyfurans were located and their relative energies were used to estimate the stereoselectivity data. We find excellent agreement between the predicted and observed stereoselectivities. The analysis of intermolecular forces reveals that the enantioselectivity is mostly due to stabilizing noncovalent interactions between the reacting partners, not due to steric hindrance. The role of attractive noncovalent interactions in enantioselective catalysis may be underappreciated. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Item Type: Article
Uncontrolled Keywords: transition states; organocatalysis; noncovalent interactions; ENANTIOSELECTIVITY; DFT calculations
Subjects: Q Science / természettudomány > QD Chemistry / kémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 14 Oct 2014 09:35
Last Modified: 14 Oct 2014 09:35
URI: http://real.mtak.hu/id/eprint/17694

Actions (login required)

Edit Item Edit Item