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Nazarov cyclisations initiated by DDQ-oxidised pentadienyl ether: a mechanistic investigation from the DFT perspective
Citation
Gouranourimi, A and Chipman, A and Babaahmadi, R and Olding, A and Yates, BF and Ariafard, A, Nazarov cyclisations initiated by DDQ-oxidised pentadienyl ether: a mechanistic investigation from the DFT perspective, Organic & Biomolecular Chemistry, 16, (46) pp. 9021-9029. ISSN 1477-0520 (2018) [Refereed Article]
Copyright Statement
© The Royal Society of Chemistry 2018
Abstract
The Nazarov cyclisation is an important and reliable reaction for the synthesis of cyclopentenones. Density functional theory (DFT) has been utilised to study the mechanism of Nazarov cyclisations initiated by oxidation of pentadienyl ethers by a benzoquinone derivative (DDQ), as recently reported by West et al. (Angew. Chem., Int. Ed., 2017, 56, 6335). We determined that the reaction is most likely initiated by a hydride transfer from the pentadienyl ether to an oxygen of DDQ through a concerted pathway and not a single electron transfer mechanism. This oxidation by hydride abstraction leads to the formation of a pentadienyl cation from which the 4π electrocyclisation occurs, giving an alkoxycyclopentenyl cation. The ensuing cation is subsequently deprotonated by the reduced DDQ to afford an enol ether product. Consistent with experimental results, the hydride transfer is calculated to be the rate determining step and it can be accelerated by using electron donating substituents on the pentadienyl ether substrate. Indeed, the electron donating substituents increase the HOMO energy of the ether, making it more reactive toward oxidation. It is predicted that an unsubstituted benzoquinone, due to having a higher lying LUMO, shows much less reactivity than DDQ. Interestingly, we found an excellent correlation between the hydride transfer activation energy and the gap between the ether HOMO and the benzoquinone LUMO. From this correlation, we propose a predictive formula for reactivity of different types of substrates in the corresponding reaction.
Item Details
Item Type: | Refereed Article |
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Keywords: | density functional theory, activation energy,, hydride abstraction, single electron transfer |
Research Division: | Chemical Sciences |
Research Group: | Organic chemistry |
Research Field: | Physical organic chemistry |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the chemical sciences |
UTAS Author: | Gouranourimi, A (Mr Ali Gouranourimi) |
UTAS Author: | Chipman, A (Mr Antony Chipman) |
UTAS Author: | Babaahmadi, R (Mr Rasool Babaahmadi) |
UTAS Author: | Olding, A (Mr Angus Olding) |
UTAS Author: | Yates, BF (Professor Brian Yates) |
UTAS Author: | Ariafard, A (Associate Professor Alireza Ariafard) |
ID Code: | 134441 |
Year Published: | 2018 |
Funding Support: | Australian Research Council (DP180100904) |
Web of Science® Times Cited: | 4 |
Deposited By: | Chemistry |
Deposited On: | 2019-08-13 |
Last Modified: | 2019-09-20 |
Downloads: | 0 |
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