Alkenyl Arenes as Dipolarophiles in Catalytic Asymmetric 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides
The use of alkenyl arenes as dipolarophiles in the catalytic asymmetric 1,3‐dipolar cycloaddition of azomethine ylides is reported. Under appropriate reaction conditions with a CuI or AgI catalyst either the exo or the endo adduct was obtained with high stereoselectivity. This process provides effic...
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Published in | Angewandte Chemie (International ed.) Vol. 55; no. 49; pp. 15334 - 15338 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Blackwell Publishing Ltd
05.12.2016
Wiley Wiley Subscription Services, Inc |
Edition | International ed. in English |
Subjects | |
Online Access | Get full text |
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Summary: | The use of alkenyl arenes as dipolarophiles in the catalytic asymmetric 1,3‐dipolar cycloaddition of azomethine ylides is reported. Under appropriate reaction conditions with a CuI or AgI catalyst either the exo or the endo adduct was obtained with high stereoselectivity. This process provides efficient access to highly enantiomerically enriched 4‐aryl proline derivatives. The observed results are compatible with the blockage of one prochiral face of the 1,3‐dipole, as well as with the efficient transmission of electrophilicity towards the terminal carbon atom of the dipolarophile. This polarization results in a change from a concerted to a stepwise mechanism.
One is enough: A single electron‐withdrawing group on the aryl moiety was sufficient for the efficient metal‐catalyzed title reaction. Depending on the catalytic system used, either the exo or the endo 4‐aryl pyrrolidine product was formed preferentially (see scheme). DFT calculations revealed that electronic effects in the styrene substrate play a key role in the reaction mechanism. |
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Bibliography: | istex:D8C8263F805572AA5FD38CDCF878652CBD9B08D7 ArticleID:ANIE201609187 ark:/67375/WNG-VNX8HTVR-W ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1433-7851 1521-3773 |
DOI: | 10.1002/anie.201609187 |