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Sun X, Bai JK, Yang YD, Zhu KL, Liang JQ, Wang XY, Xiang JF, Hao X, Liang TL, Guan AJ, Wu NN, Gong HY. Controlled interconversion of macrocyclic atropisomers via defined intermediates. Nat Commun 2024; 15:6559. [PMID: 39095340 PMCID: PMC11297318 DOI: 10.1038/s41467-024-50739-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 07/18/2024] [Indexed: 08/04/2024] Open
Abstract
Macrocyclic conformations play a crucial role in regulating their properties. Our understanding of the determinants to control macrocyclic conformation interconversion is still in its infancy. Here we present a macrocycle, octamethyl cyclo[4](1,3-(4,6)-dimethylbenzene)[4]((4,6-benzene)(1,3-dicarboxylate) (OC-4), that can exist at 298 K as two stable atropisomers with C2v and C4v symmetry denoted as C2v-OC-4 and C4v-OC-4, respectively. Heating induces the efficient stepwise conversion of C2v- to C4v-OC-4 via a Cs-symmetric intermediate (Cs-OC-4). It differs from the typical transition state-mediated processes of simple C-C single bond rotations. Hydrolysis and further esterification with a countercation dependence promote the generation of C2v- and Cs-OC-4 from C4v-OC-4. In contrast to C2v-OC-4, C4v-OC-4 can bind linear guests to form pseudo-rotaxans, or bind C60 or C70 efficiently. The present study highlights the differences in recognition behavior that can result from conformational interconversion, as well as providing insights into the basic parameters that govern coupled molecular rotations.
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Affiliation(s)
- Xin Sun
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Jin-Ku Bai
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Yu-Dong Yang
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Ke-Lin Zhu
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Jia-Qi Liang
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Xin-Yue Wang
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China
| | - Jun-Feng Xiang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Xiang Hao
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Tong-Ling Liang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Ai-Jiao Guan
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Ning-Ning Wu
- Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China
- University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Han-Yuan Gong
- College of Chemistry, Beijing Normal University, Beijing, 100875, PR China.
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Yoshimura T, Onda KI, Matsuo JI. Asymmetric Cycloaddition Reactions of Aryne Intermediates with a Chiral Carbon-Carbon Axis: Syntheses of Axially Chiral Biaryl Compounds. Org Lett 2023. [PMID: 38055630 DOI: 10.1021/acs.orglett.3c03983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
An asymmetric synthesis via an axially chiral arylaryne intermediate was developed. A cycloaddition reaction with various arynophiles was used to obtain chiral biaryl compounds while preserving the enantiomeric excess (ee) of a precursor even though the reaction proceeds through an arylaryne intermediate, whose chirality decreases on a time-dependent basis. High chiral transfer from a precursor to a product was observed not only at low temperature (-78 °C) but also at room temperature.
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Affiliation(s)
- Tomoyuki Yoshimura
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Ken-Ichi Onda
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Jun-Ichi Matsuo
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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