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  4. Enantiospecific Synthesis of Planar Chiral Rhodium and Iridium Cyclopentadienyl Complexes: Enabling Streamlined and Computer-Guided Access to Highly Selective Catalysts for Asymmetric C-H Functionalizations
 
research article

Enantiospecific Synthesis of Planar Chiral Rhodium and Iridium Cyclopentadienyl Complexes: Enabling Streamlined and Computer-Guided Access to Highly Selective Catalysts for Asymmetric C-H Functionalizations

Ye, Young Sebastian
•
Laverny, Aragorn  
•
Wodrich, Matthew D.  
Show more
December 18, 2024
Journal of the American Chemical Society

Chiral cyclopentadienyl (CpX) metal complexes are frequently used in asymmetric catalysis by virtue of their high reactivity and selectivity. Planar-chiral-only rhodium and iridium cyclopentadienyl complexes are particularly promising due to unrestricted chemical space for CpX ligand design while retaining structural simplicity. However, they are currently still niche because of a lack of efficient synthetic strategies that avoid lengthy chiral auxiliary routes or chiral preparatory HPLC resolution of the complexes. To streamline access to such planar-chiral-only CpX-metal complexes, we designed a straightforward, highly enantiospecific, point-to-planar chirality transfer complexation via facially selective concerted-metalation-deprotonation between metal-carboxylate precursor [M(olefin)2OAc]2 and a chiral cyclopentadiene. This entirely avoids the typical stereoablative complexation of an achiral cyclopentadienyl anion that detrimentally yields a racemate. Exploiting the described enantiospecific complexation protocol and a simple divergent synthetic route to suitable chiral cyclopentadienes, we generated a structurally diverse library of new planar chiral Cp-Rh(I), Cp-Ir(I), Cp-Rh(III), and Cp-Ir(III) complexes. Moreover, the enantiospecific complexation step can be concatenated with a preceding Au-catalyzed cyclization in an efficient one-pot process that likely involves an elaborate point-to-axial-to-point-to-planar chirality transfer. Guided by computational selectivity predictions, the structure of a CpX-Rh complex in our library was tuned to optimize reactivity and selectivity in the asymmetric C-H functionalization of a benzamide with various challenging alkenes. With an optimized CpX-Rh complex in hand, we showcased its excellent catalytic performance and high selectivity for refractory alkene substrates that reacted in poor selectivity with previous CpX-Rh catalysts.

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Type
research article
DOI
10.1021/jacs.4c13279
Scopus ID

2-s2.0-85211027716

PubMed ID

39642345

Author(s)
Ye, Young Sebastian

École Polytechnique Fédérale de Lausanne

Laverny, Aragorn  

École Polytechnique Fédérale de Lausanne

Wodrich, Matthew D.  

École Polytechnique Fédérale de Lausanne

Laplaza, Ruben  

École Polytechnique Fédérale de Lausanne

Fadaei-Tirani, Farzaneh  

École Polytechnique Fédérale de Lausanne

Scopelliti, Rosario  

École Polytechnique Fédérale de Lausanne

Corminboeuf, Clemence  

École Polytechnique Fédérale de Lausanne

Cramer, Nicolai  

École Polytechnique Fédérale de Lausanne

Date Issued

2024-12-18

Published in
Journal of the American Chemical Society
Volume

146

Issue

50

Start page

34786

End page

34795

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCMD  
ISIC-XRDSAP  
LCSA  
FunderFunding(s)Grant NumberGrant URL

EPFL

Swiss National Science Foundation

NCCR

180544

Available on Infoscience
January 25, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/244269
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