Issue 4, 2022

Bio-inspired asymmetric aldehyde arylations catalyzed by rhodium-cyclodextrin self-inclusion complexes

Abstract

Transition-metal catalysts are powerful tools for carbon–carbon bond-forming reactions that are difficult to achieve using native enzymes. Enzymes that exhibit inherent selectivities and reactivities through host–guest interactions have inspired widespread interest in incorporating enzymatic behavior into transition-metal catalytic systems that highly efficiently produce enantiopure compounds. Nevertheless, bio-inspired transition-metal catalysts that are highly enantioselective and reactive have rarely been reported. In this study, we applied γ-cyclodextrin-imidazolium salts to the rhodium-catalyzed asymmetric arylations of aldehydes. The method exhibits wide substrate scope and the corresponding arylcarbinols are obtained in excellent yields under optimized conditions, with enantiomeric excesses of up to 96% observed. Kinetic and competition experiments revealed that self-inclusion of the Rh complex contributes to the high enantioselectivity and reactivity achieved by this catalytic system. Thus, this bio-inspired self-inclusion strategy is promising for the development of highly enantioselective and reactive transition-metal catalysts for asymmetric carbon–carbon bond formation.

Graphical abstract: Bio-inspired asymmetric aldehyde arylations catalyzed by rhodium-cyclodextrin self-inclusion complexes

Supplementary files

Article information

Article type
Paper
Submitted
14 Okt. 2021
Accepted
15 Nov. 2021
First published
19 Nov. 2021

Org. Biomol. Chem., 2022,20, 801-807

Bio-inspired asymmetric aldehyde arylations catalyzed by rhodium-cyclodextrin self-inclusion complexes

S. Tsuda, K. Asahi, R. Takahashi, H. Yamauchi, R. Ueda, T. Iwasaki, S. Fujiwara and N. Kambe, Org. Biomol. Chem., 2022, 20, 801 DOI: 10.1039/D1OB02014E

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