1
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Suzuki N, Taura D, Furuta Y, Ono Y, Miyagi S, Kameda R, Haino T. Temperature-Dependent Left- and Right-Twisted Conformational Changes in 1 : 1 Host-Guest Systems: Theoretical Modeling and Chiroptical Simulations. Angew Chem Int Ed Engl 2025; 64:e202413340. [PMID: 39183174 DOI: 10.1002/anie.202413340] [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: 07/15/2024] [Revised: 08/20/2024] [Accepted: 08/20/2024] [Indexed: 08/27/2024]
Abstract
An efficient strategy for high-performance chiral materials is to design and synthesize host molecules with left- and right- (M- and P-)twisted conformations and to control their twisted conformations. For this, a quantitative analysis is required to describe the chiroptical inversion, chiral transfer, and chiral recognition in the host-guest systems, which is generally performed using circular dichroism (CD) and/or proton nuclear magnetic resonance (1H NMR) spectroscopies. However, the mass-balance model that considers the M- and P-twisted conformations has not yet been established. In this study, we derived the novel equations based on the mass-balance model for the 1 : 1 host-guest systems. Then, we further applied them to analyze the 1 : 1 host-guest systems for the achiral calixarene-based capsule molecule, achiral dimeric zinc porphyrin tweezer molecule, and chiral pillar[5]arene with the chiral and/or achiral guest molecules by using the data obtained from the CD titration, variable temperature CD (VT-CD), and 1H NMR experiments. The thermodynamic parameters (ΔH and ΔS), equilibrium constants (K), and molar CD (Δϵ) in the 1 : 1 host-guest systems could be successfully determined by the theoretical analyses using the derived equations.
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Affiliation(s)
- Nozomu Suzuki
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe, 657-8501, Japan
- Department of Human Studies, Faculty of Arts and Humanities, Shikoku Gakuin University, 3-2-1 Bunkyo-cho, Zentsuji, Kagawa, 765-8505, Japan
| | - Daisuke Taura
- Department of Applied Chemistry, Faculty of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 468-8502, Japan
- Department of Applied Chemistry, Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 468-8502, Japan
| | - Yusuke Furuta
- Department of Applied Chemistry, Graduate School of Science and Technology, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya, 468-8502, Japan
| | - Yudai Ono
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Senri Miyagi
- Department of Chemistry, School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryota Kameda
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
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2
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Ousaka N, MacLachlan MJ, Akine S. Redox-Triggered Reversible Switching between Dynamic and Quasi-static α-Helical Peptides. Chemistry 2024; 30:e202402704. [PMID: 39023308 DOI: 10.1002/chem.202402704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2024] [Revised: 07/17/2024] [Accepted: 07/18/2024] [Indexed: 07/20/2024]
Abstract
We report the reversible transformation between a singly stapled dynamic α-helical peptide and a doubly stapled quasi-static one through redox-triggered dithiol/disulfide conversions of a stapling moiety. This process allows the rate of interconversion between the right-handed (P) and left-handed (M) α-helices to be altered by a factor of approximately 103 before and after the transformation. An as-obtained doubly stapled α-helical peptide, which is composed of an achiral peptide having an l-valine carboxylic acid residue at the C-terminus, a disulfide-based reversible staple, and a biphenyl-based fixed staple, adopts an (M)-rich form as a kinetically trapped state. The (M)-rich helix was subsequently transformed into the thermodynamically stable (P)-rich form in 1,1,2,2-tetrachloroethane with the half-life time (t1/2) of approximately 44 days at 25 °C. Reduction of the doubly stapled peptide with tri-n-butylphosphine in tetrahydrofuran/water (10/1, v/v) produced the corresponding singly stapled dynamic α-helical peptide bearing two thiol groups at the side chains, which underwent solvent-induced reversible helicity inversion. The resulting dithiol of the singly stapled peptide could be reoxidized to form the original doubly stapled form using 4,4'-dithiodipyridine. Furthermore, the P/M interconversion of a doubly stapled peptide with two flexible hydrocarbon-based staples is considerably more rapid than that with more rigid staples.
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Affiliation(s)
- Naoki Ousaka
- Nano Life Science Institute (WPI-NanoLSI), Kakuma-machi, Kanazawa University, 920-1192, Kanazawa, Japan
- Research Center for Negative Emissions Technologies, Kyushu University, 819-0395, Fukuoka, Japan
| | - Mark J MacLachlan
- Nano Life Science Institute (WPI-NanoLSI), Kakuma-machi, Kanazawa University, 920-1192, Kanazawa, Japan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
- Quantum Matter Institute, University of British Columbia, 2355 East Mall, V6T 1Z4, Vancouver, BC, Canada
| | - Shigehisa Akine
- Nano Life Science Institute (WPI-NanoLSI), Kakuma-machi, Kanazawa University, 920-1192, Kanazawa, Japan
- Graduate School of Natural Science and Technology, Kanazawa University, 920-1192, Kanazawa, Japan
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3
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Chandel D, Pal C, Saha B, Asif Ikbal S, Rath SP. Induction and rationalization of supramolecular chirality in a highly flexible Zn(II)porphyrin dimer: structural, spectroscopic and theoretical investigations. Dalton Trans 2022; 51:14125-14137. [PMID: 36043507 DOI: 10.1039/d2dt01745h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly flexible pyrrole-bridged Zn(II)porphyrin dimer has been successfully utilized as an efficient host which enables an accurate determination of the absolute configuration directly for a large number of chiral amino alcohols and 1,2-diols. The addition of substrates resulted in the formation of 1 : 1 sandwich complexes which, after the addition of excess substrates, produced 1 : 2 host-guest complexes. In principle, the 1 : 2 host-guest complexes can be stabilized in three possible conformations, viz. exo-exo, exo-endo, and endo-endo based on how a substrate binds to the metal. The endo-endo conformation is stabilized by two strong interligand H-bonds [O-H⋯O(H)] between encapsulated diols which thereby interlock the stereochemistry. In the absence of such interligand H-bonding interactions, exo-endo binding is preferred as it is indeed observed for amino alcohols which show weaker CD couplets due to the free movement of substrates. The sandwich complexes with amino alcohols show a more intense CD couplet compared to the diols due to the stronger binding of the amine functionality (-NH2) towards a Zn-atom over an alcoholic moiety (-OH). The CD amplitude showed linear dependence with a binding constant for the 1 : 1 sandwich complex upon varying the substrates. Spectroscopic investigations, single crystal X-ray structure determination of four such host-guest complexes and DFT studies have enabled us to rationalize systematically the origin of optical activity unambiguously in the 1 : 1 and 1 : 2 host-guest complexes, which lead to an absolute stereochemical determination of a large number of chiral substrates. The larger vertical and horizontal flexibility of a diethyl pyrrole spacer induces stronger binding of the substrates to form the 1 : 1 complex with a much larger torsional angle along with intense CD couplets. In contrast, a rigid dibenzothiophene-bridged tweezer, due to its limited horizontal and vertical flexibility, facilitates 1 : 2 complexation more as compared to the highly flexible pyrrole-bridged host which results in stronger binding of the substrate with the intense CD couplet for the former.
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Affiliation(s)
- Dolly Chandel
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Chandrani Pal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Bapan Saha
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Sk Asif Ikbal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
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4
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Chen J, Yang Z, Zhu G, Fu E, Li P, Chen F, Yu C, Wang S, Zhang S. Heterochiral Diastereomer-Discriminative Diphanes That Form Hierarchical Superstructures with Nonlinear Optical Properties. JACS AU 2022; 2:1661-1668. [PMID: 35911451 PMCID: PMC9327085 DOI: 10.1021/jacsau.2c00225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In order to study the emergence of homochirality during complex molecular systems, most works mainly concentrated on the resolution of a pair of enantiomers. However, the preference of homochiral over heterochiral isomers has been overlooked, with very limited examples focusing only on noncovalent interactions. We herein report on diastereomeric discrimination of twin-cavity cages (denoted as diphanes) against heterochiral tris-(2-aminopropyl)amine (TRPN) bearing triple stereocenters. This diastereomeric selectivity results from distinct spatial orientation of reactive secondary amines on TRPN. Homochiral TRPNs with all reactive moieties rotating in the same way facilitate the formation of homochiral and achiral meso diphanes with low strain energy, while heterochiral TRPNs with uneven orientation of secondary amines preclude the formation of cage-like entity, since the virtual diphanes exhibit considerably high strain. Moreover, homochiral diphanes self-assemble into an acentric superstructure composed of single-handed helices, which exhibits interesting nonlinear optical behavior. Such a property is a unique occurrence for organic cages, which thus showcases their potential to spawn novel materials with interesting properties and functions.
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Affiliation(s)
- Jiaolong Chen
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zhenyu Yang
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Gucheng Zhu
- Key
Laboratory of Artificial Structures and Quantum Control (Ministry
of Education), Shenyang National Laboratory for Materials Science,
School of Physics and Astronomy, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Enguang Fu
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Pan Li
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Fangyi Chen
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Chunyang Yu
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Shiyong Wang
- Key
Laboratory of Artificial Structures and Quantum Control (Ministry
of Education), Shenyang National Laboratory for Materials Science,
School of Physics and Astronomy, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Shaodong Zhang
- School
of Chemistry and Chemical Engineering, Shanghai
Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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5
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Maruyama J, Maruyama S, Kashiwagi Y, Watanabe M, Shinagawa T, Nagaoka T, Tamai T, Ryu N, Matsuo K, Ohwada M, Chida K, Yoshii T, Nishihara H, Tani F, Uyama H. Helically aligned fused carbon hollow nanospheres with chiral discrimination ability. NANOSCALE 2022; 14:3748-3757. [PMID: 35167641 DOI: 10.1039/d1nr07971a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
While the functions of carbon materials with precisely controlled nanostructures have been reported in many studies, their chiral discriminating abilities have not been reported yet. Herein, chiral discrimination is achieved using helical carbon materials devoid of chiral attachments. A Fe3O4 nanoparticle template with ethyl cellulose (carbon source) is self-assembled on dispersed multiwalled carbon nanotubes (MWCNTs) fixed in a lamellar structure, with helical nanoparticle alignment induced by the addition of a binaphthyl derivative. Carbonization followed by template removal produces helically aligned fused carbon hollow nanospheres (CHNSs) with no chiral molecules left. Helicity is confirmed using vacuum-ultraviolet circular dichroism spectroscopy. Chiral discrimination, as revealed by the electrochemical reactions of binaphthol and a chiral ferrocene derivative in aqueous and nonaqueous electrolytes, respectively, is attributable to the chiral space formed between the CHNS and MWCNT surfaces.
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Affiliation(s)
- Jun Maruyama
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Shohei Maruyama
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Yukiyasu Kashiwagi
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Mitsuru Watanabe
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Tsutomu Shinagawa
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Toru Nagaoka
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Toshiyuki Tamai
- Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan.
| | - Naoya Ryu
- Kumamoto Industrial Research Institute, 3-11-38, Higashimachi, Higashi-ku, Kumamoto 862-0901, Japan
| | - Koichi Matsuo
- Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima 739-0046, Japan
| | - Mao Ohwada
- Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Koki Chida
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Takeharu Yoshii
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Hirotomo Nishihara
- Advanced Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Fumito Tani
- Institute for Materials Chemistry and Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hiroshi Uyama
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita 565-0871, Japan
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6
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Hisano N, Haino T. Host-Guest Complexation of Bisporphyrin Cleft and Electron-Deficient Aromatic Guests. J Org Chem 2022; 87:4001-4009. [PMID: 35085436 DOI: 10.1021/acs.joc.1c02742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The host-guest complexation of a bisporphyrin cleft with various electron-deficient guest molecules was studied in solution and in the solid-state. X-ray crystal structures of a bisporphyrin cleft with naphthalene dianhydride and 2,4,7-trinitrofluorenone reveal that these guest molecules were located within the bisporphyrin cleft and formed ideal π-π stacking interactions in a host-guest ratio of 1:1. Isothermal titration calorimetry determined the binding constants and thermodynamic parameters for the 1:1 host-guest complexations in 1,2-dichloroethane and toluene. Two types of enthalpy-entropy compensation effects were found: (1) The tightly stacked host-guest structures restrict guest movement within the cleft, which results in significant desolvation with large intrinsic entropies. (2) The loosely bound guests maintain their molecular freedom within the bisporphyrin cleft, which leads to less desolvation with small intrinsic entropies. Chiral guest encapsulation directed the clockwise and anticlockwise twisted conformations of the bisporphyrin units, which induced bisignate CDs.
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Affiliation(s)
- Naoyuki Hisano
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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7
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Li P, Sun Z, Chen J, Zuo Y, Yu C, Liu X, Yang Z, Chen L, Fu E, Wang W, Zhang J, Liu Z, Hu J, Zhang S. Spontaneous Resolution of Racemic Cage-Catenanes via Diastereomeric Enrichment at the Molecular Level and Subsequent Narcissistic Self-Sorting at the Supramolecular Level. J Am Chem Soc 2022; 144:1342-1350. [PMID: 35029983 DOI: 10.1021/jacs.1c11452] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The spontaneous resolution of racemates, from natural compounds to artificial structures, has long been pursued to shed light on the origin of homochirality in life. Even though diverse synthetic systems have been elegantly devised to elaborate the underlying principles of spontaneous symmetry breaking, their complexity is still unparalleled to the natural masterpieces including DNA helix and proteins, which convey remarkable coalescence at both molecular and supramolecular levels. Here, we report on the spontaneous resolution of a pair of homochiral entities from a racemic mixture of a triply interlocked cage-catenane comprising 720 possible stereoisomers. This cage-catenane comprises six methyldithiane ring-containing linkers (denoted rac-2). As each methyldithiane ring has two chiral centers, it exhibits four possible diastereomers. These otherwise equimolar diastereomers are preferentially differentiated with the equatorial conformers over their axial analogues, leading to the dominant formation of (S, R)-2 and (R, S)-2, i.e., diastereomeric enrichment at the molecular level. This diastereomeric enrichment is unbiasedly transferred from precursor rac-2 to cage-catenane rac-4, from which a pair of homochirals (S, R)6-4 and (R, S)6-4 is narcissistically self-sorted upon crystallization. This powerful symmetry breaking is attributed to a supramolecular synergy of directional π-π stacking with the multivalency of erstwhile weak S···S contacts (with an unusual distance of 3.09 Å) that are cooperatively arranged in a helical fashion. This work highlights the attainability of complex homochiral entities by resorting to coalesced covalent and noncovalent contributions and therefore provides additional clues to the symmetry breaking of sophisticated yet well-defined architectures.
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Affiliation(s)
- Pan Li
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zhongwei Sun
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Jiaolong Chen
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Yong Zuo
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Chunyang Yu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Xiaoning Liu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zhenyu Yang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Lihua Chen
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Enguang Fu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Weihao Wang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Jiacheng Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Zhiqiang Liu
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jinming Hu
- CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shaodong Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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8
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Saha B, Chandel D, Rath SP. Hydrogen-Bonding Interactions Trigger Induction of Chirality via Formation of a Cyclic Dimer. Inorg Chem 2022; 61:2154-2166. [PMID: 35040641 DOI: 10.1021/acs.inorgchem.1c03362] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A rationalization for the chirality transfer mechanism in the supramolecular host-guest assemblies of an achiral Zn(II) porphyrin dimer (host) and a series of chiral diamines and diamino esters (substrates) via cyclic dimer formation has been reported for the first time. Stepwise formations of 2:2 host-guest cyclic dimers and 1:2 host-guest monomeric complexes have been observed via intermolecular assembling and disassembling processes. A large bisignate CD couplet was observed for the cyclic dimer, whereas the monomeric complexes exhibited negligible CD intensity. Crystallographic characterizations demonstrate that the strong intermolecular H bonding in cyclic dimers is responsible for their stability over the linear chain, which thereby display high-intensity bisignate CD couplets. In order to minimize the steric crowding within the host-guest assembly, the cyclic dimer switches its helicity toward the conformer having less steric hindrance. The cyclic scaffold is oriented according to the pre-existing chirality of the substrate in both the solid and solution phases: the substrates having R chirality display a negative CD couplet, whereas the substrates with S chirality display a positive couplet. Opposite signs for the CD couplets between R and S substrates suggest that the stereographic projection at the chiral centers solely dictates the overall helicity of the cyclic dimer. DFT studies further support the experimental observations.
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Affiliation(s)
- Bapan Saha
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Dolly Chandel
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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9
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Wu MY, Xu JX, Chen YH, Lu IC, Han JL, Lin PH. Self-assembled lanthanide-based helixes: synthetic control of the helical handedness by chirality of the ligand. Dalton Trans 2021; 51:69-73. [PMID: 34897306 DOI: 10.1039/d1dt03833h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The control of the self-assembly of lanthanide helical chain and their helical handedness have been investigated for the first time. Δ- and Λ-form lanthanide chain complexes were obtained by introducing thiazolidine ligands that were synthesised from L- and D-cysteine, respectively, and shared the same formula: [Ln2(L)3(H2O)5]∞·3H2O (Ln: Sm and Eu) (L: 2-(2-hydroxy-3,5-dinitrophenyl)thiazolidine-4-carboxylic acid). The crystallographic, circular dichroism, and luminescence properties of these novel lanthanide chain complexes were studied.
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Affiliation(s)
- Min-Yu Wu
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
| | - Jing-Xiang Xu
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
| | - Yi-Hsin Chen
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
| | - I-Chung Lu
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
| | - Jeng-Liang Han
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
| | - Po-Heng Lin
- Department of Chemistry, National Chung Hsing University, 250 Kuo Kuang Rd., Taichung 402, Taiwan.
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10
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Ousaka N, Yamamoto S, Iida H, Iwata T, Ito S, Souza R, Hijikata Y, Irle S, Yashima E. Encapsulation of Aromatic Guests in the Bisporphyrin Cavity of a Double-Stranded Spiroborate Helicate: Thermodynamic and Kinetic Studies and the Encapsulation Mechanism. J Org Chem 2021; 86:10501-10516. [PMID: 34282918 DOI: 10.1021/acs.joc.1c01155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A double-stranded spiroborate helicate bearing a bisporphyrin unit in the middle forms an inclusion complex with electron-deficient aromatic guests that are sandwiched between the porphyrins. In the present study, we systematically investigated the effects of size, electron density, and substituents of a series of aromatic guests on inclusion complex formations within the bisporphyrin. The thermodynamic and kinetic behaviors during the guest-encapsulation process were also investigated in detail. The guest-encapsulation abilities in the helicate increased with the increasing core sizes of the electron-deficient aromatic guests and decreased with the increasing bulkiness and number of substituents of the guests. Among the naphthalenediimide derivatives, those with bulky N-substituents at both ends hardly formed an inclusion complex. Instead, they formed a [2]rotaxane-like inclusion complex through the water-mediated dynamic B-O bond cleavage/reformation of the spiroborate groups of the helicate, which enhanced the conformational flexibility of the helicate to enlarge the bisporphyrin cavity and form an inclusion complex. Based on the X-ray crystal structure of a unique pacman-like 1:1 inclusion complex between the helicate and an ammonium cation as well as the molecular dynamics simulation results, a plausible mechanism for the inclusion of a planar aromatic guest within the helicate is also proposed.
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Affiliation(s)
- Naoki Ousaka
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.,Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Shinya Yamamoto
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Hiroki Iida
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Takuya Iwata
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Shingo Ito
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Rafael Souza
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Yuh Hijikata
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Nagoya 464-8601, Japan
| | - Stephan Irle
- Department of Chemistry, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Nagoya 464-8601, Japan
| | - Eiji Yashima
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.,Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
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11
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Recognition and Sensing of Chiral Organic Molecules by Chiral Porphyrinoids: A Review. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9080204] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Porphyrinoids are extremely attractive for their electronic, optical, and coordination properties as well as for their versatile substitution at meso/β-positions. All these features allow porphyrinoids to behave as chiroptical hosts for chiral recognition by means of non-covalent interactions towards chiral guests. Over the years, chiral discrimination of chiral molecules such as amino acids, alcohols, amines, hydroxy-carboxylic acids, etc. has aroused the interest of the scientific community. Hence, this review aims to report on the progress to date by illustrating some relevant research regarding the chiral recognition of a multitude of chiral organic guests through several chiral mono- and bis-porphyrins via different spectroscopic techniques.
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12
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Weh M, Rühe J, Herbert B, Krause AM, Würthner F. Deracemization of Carbohelicenes by a Chiral Perylene Bisimide Cyclophane Template Catalyst. Angew Chem Int Ed Engl 2021; 60:15323-15327. [PMID: 33909943 PMCID: PMC8362091 DOI: 10.1002/anie.202104591] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Indexed: 12/16/2022]
Abstract
Deracemization describes the conversion of a racemic mixture of a chiral molecule into an enantioenriched mixture or an enantiopure compound without structural modifications. Herein, we report an inherently chiral perylene bisimide (PBI) cyclophane whose chiral pocket is capable of transforming a racemic mixture of [5]-helicene into an enantioenriched mixture with an enantiomeric excess of 66 %. UV/Vis and fluorescence titration studies reveal this cyclophane host composed of two helically twisted PBI dyes has high binding affinities for the respective homochiral carbohelicene guests, with outstanding binding constants of up to 3.9×1010 m-1 for [4]-helicene. 2D NMR studies and single-crystal X-ray analysis demonstrate that the observed strong and enantioselective binding of homochiral carbohelicenes and the successful template-catalyzed deracemization of [5]-helicene can be explained by the enzyme-like perfect shape complementarity of the macrocyclic supramolecular host.
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Affiliation(s)
- Manuel Weh
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Jessica Rühe
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Benedikt Herbert
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Ana-Maria Krause
- Center for Nanosystems Chemistry (CNC), Universität Würzburg, Theodor-Boveri-Weg, 97074, Würzburg, Germany
| | - Frank Würthner
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Center for Nanosystems Chemistry (CNC), Universität Würzburg, Theodor-Boveri-Weg, 97074, Würzburg, Germany
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13
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Weh M, Rühe J, Herbert B, Krause A, Würthner F. Deracemization of Carbohelicenes by a Chiral Perylene Bisimide Cyclophane Template Catalyst. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104591] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Manuel Weh
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Jessica Rühe
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Benedikt Herbert
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Ana‐Maria Krause
- Center for Nanosystems Chemistry (CNC) Universität Würzburg Theodor-Boveri-Weg 97074 Würzburg Germany
| | - Frank Würthner
- Institut für Organische Chemie Universität Würzburg Am Hubland 97074 Würzburg Germany
- Center for Nanosystems Chemistry (CNC) Universität Würzburg Theodor-Boveri-Weg 97074 Würzburg Germany
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14
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Zhang Z, Zhou Y, Gao T, Yan P, Zou X, Li H. Diastereoselective self-assembly of a triple-stranded europium helicate with light modulated chiroptical properties. Dalton Trans 2021; 50:4604-4612. [PMID: 33710241 DOI: 10.1039/d1dt00251a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Chiroptical photoswitches are of increasing interest for their potential in advanced information technologies. Herein, an achiral bis-β-diketonate ligand (o-L) with a photoresponsive diarylethene moiety as a linker was designed, which co-assembled with Eu3+ ions and R- and S-bis(diphenylphosphoryl)-1,10-binaphthyl (R/S-BINAPO) as chiral ancillaries to form dinuclear triple-stranded helicates, [Eu2(o-L)3(R/S-BINAPO)2]. The helicates in the enantiopure form were confirmed by 1H, 19F, 31P NMR and DOSY NMR analyses. Furthermore, the mirror-image CD and CPL spectra also demonstrate the existence of stable ground- and excited-state chiralities in solution. When exposed to alternate ultraviolet and visible light, the helicates showed reversible color variations from colorless to purple, followed by the presence of light-triggered quadruple optical and chiroptical outputs, named CD, PL, CPL and glum switches. With these light-modulated optical outputs, the possibility for the fabrication of IMPLICATION and INHIBIT logic gates was discussed.
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Affiliation(s)
- Zhihui Zhang
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education; School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China.
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15
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Ousaka N, Itakura M, Nagasaka A, Ito M, Hattori T, Taura D, Ikai T, Yashima E. Water-Mediated Reversible Control of Three-State Double-Stranded Titanium(IV) Helicates. J Am Chem Soc 2021; 143:4346-4358. [PMID: 33688731 DOI: 10.1021/jacs.0c13351] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A stimuli-responsible reversible structural transformation is of key importance in biological systems. We now report a unique water-mediated reversible transformation among three discrete double-stranded dinuclear titanium(IV) achiral meso- and chiral rac-helicates linked by a mono(μ-oxo) or a bis(μ-hydroxo) bridge between the titanium ions through hydration/dehydration or its combination with a water-mediated dynamic cleavage/re-formation of the titanium-phenoxide (Ti-OPh) bonds. The bis(μ-hydroxo) bridged titanium(IV) meso-helicate prepared from two tetraphenol strands with titanium(IV) oxide was readily dehydrated in CD3CN containing a small amount of water upon heating, accompanied by Ti-OPh bond cleavage/re-formation catalyzed by water, resulting in the formation of the mono(μ-oxo)-bridged rac-helicate, which reverted back to the original bis(μ-hydroxo)-bridged meso-helicate upon hydration in aqueous CD3CN. These reversible transformations between the meso- and rac-helicates were also promoted in the presence of a catalytic amount of an acid, which remarkably accelerated the reactions at lower temperature. Interestingly, in anhydrous CD3CN, the bis(μ-hydroxo)-bridged meso-helicate was further slowly converted to a different helicate, while its meso-helicate framework was maintained, namely the mono(μ-oxo)-bridged meso-helicate, through dehydration upon heating and its meso to meso transformation was significantly accelerated in the presence of cryptand[2.2.1], which contributes to removing Na+ ions coordinated to the helicate. Upon cooling, the backward meso to meso transformation took place via hydration. Hence, three different, discrete double-stranded chiral rac- and achiral meso-titanium(IV) helicates linked by a mono(μ-oxo) or a bis(μ-hydroxo) bridge were successfully generated in a controllable manner by a change in the water content of the reaction media.
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Affiliation(s)
- Naoki Ousaka
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.,Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Manabu Itakura
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Akira Nagasaka
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Masaki Ito
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Tomonari Hattori
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Daisuke Taura
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.,Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Tomoyuki Ikai
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.,Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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16
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Ousaka N, Yashima E. Stimuli-responsive Molecular Springs Based on Single- and Multi-stranded Helical Structures. CHEM LETT 2021. [DOI: 10.1246/cl.200737] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Naoki Ousaka
- Molecular Engineering Institute, Kyushu Institute of Technology, Tobata-ku, Kitakyushu, Fukuoka 804-8550, Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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17
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Taura D, Wang X, Ito M, Yashima E. Selective formation of spiroborate-based double-stranded hetero-helicates assisted by donor–acceptor interactions. Org Chem Front 2021. [DOI: 10.1039/d1qo00286d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel spiroborate-based double-stranded hetero-helicate is selectively formed through donor–acceptor interactions between the central electron-rich porphyrin and electron-deficient naphthalene diimide units.
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Affiliation(s)
- Daisuke Taura
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Xiang Wang
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Masaki Ito
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
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18
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Fontana LA, Almeida MP, Alcântara AFP, Rigolin VH, Ribeiro MA, Barros WP, Megiatto JD. Ru(II)Porphyrinate-based molecular nanoreactor for carbene insertion reactions and quantitative formation of rotaxanes by active-metal-template syntheses. Nat Commun 2020; 11:6370. [PMID: 33311502 PMCID: PMC7733472 DOI: 10.1038/s41467-020-20046-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 10/29/2020] [Indexed: 12/28/2022] Open
Abstract
Selectivity in N–H and S–H carbene insertion reactions promoted by Ru(II)porphyrinates currently requires slow addition of the diazo precursor and large excess of the primary amine and thiol substrates in the reaction medium. Such conditions are necessary to avoid the undesirable carbene coupling and/or multiple carbene insertions. Here, the authors demonstrate that the synergy between the steric shielding provided by a Ru(II)porphyrinate-based macrocycle with a relatively small central cavity and the kinetic stabilization of otherwise labile coordinative bonds, warranted by formation of the mechanical bond, enables single carbene insertions to occur with quantitative efficiency and perfect selectivity even in the presence of a large excess of the diazo precursor and stoichiometric amounts of the primary amine and thiol substrates. As the Ru(II)porphyrinate-based macrocycle bears a confining nanospace and alters the product distribution of the carbene insertion reactions when compared to that of its acyclic version, the former therefore functions as a nanoreactor. Selectivity in carbene insertion reactions promoted by Ru(II)porphyrinates is achieved only upon careful control of substrate stoichiometry. Here, the authors demonstrate that endotopic catalysis and formation of mechanical bonds enables carbene insertions to occur selectively and in quantitative yield regardless of substrate stoichiometry.
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Affiliation(s)
- Liniquer A Fontana
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil
| | - Marlon P Almeida
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil
| | - Arthur F P Alcântara
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil.,Instituto Federal do Sertão Pernambucano, Estrada do Tamboril, 56200-000, Ouricuri, Brazil
| | - Vitor H Rigolin
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil
| | - Marcos A Ribeiro
- Departamento de Química, Universidade Federal do Espírito Santo, Av. Fernando Ferrari, 514, 29075-910, Vitória, Brazil
| | - Wdeson P Barros
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil
| | - Jackson D Megiatto
- Institute of Chemistry, University of Campinas (UNICAMP), POBox 6154, 13083-970, Campinas, Brazil.
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19
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Ito M, Ikai T, Yamamoto S, Taura D, Ousaka N, Yashima E. Chiral Guest-induced Catalytic Deracemization of a Spiroborate-based Double-stranded Helicate Bearing a Bisporphyrin Unit with Acids. CHEM LETT 2020. [DOI: 10.1246/cl.200352] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Masaki Ito
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Tomoyuki Ikai
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Shinya Yamamoto
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Daisuke Taura
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Naoki Ousaka
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
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20
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Saha B, Ikbal SA, Rath SP. Complexation of Chiral Zinc(II)Porphyrin Tweezer with Chiral Guests: Control, Discrimination and Rationalization of Supramolecular Chirality. Inorg Chem 2020; 59:7795-7809. [DOI: 10.1021/acs.inorgchem.0c00877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Bapan Saha
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Sk Asif Ikbal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
| | - Sankar Prasad Rath
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
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21
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Taura D, Shimizu K, Yokota C, Ikeda R, Suzuki Y, Iida H, Ousaka N, Yashima E. Fluorescent molecular spring that visualizes the extension and contraction motions of a double-stranded helicate bearing terminal pyrene units triggered by release and binding of alkali metal ions. Chem Commun (Camb) 2019; 55:12084-12087. [DOI: 10.1039/c9cc06126f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A unique springlike motion of a fluorescent pyrene-terminated double-stranded helicate is visualized by the catch and release of alkali metal ions.
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Affiliation(s)
- Daisuke Taura
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
- Department of Molecular Design and Engineering
| | - Kaori Shimizu
- Department of Molecular Design and Engineering
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Chiaki Yokota
- Department of Molecular Design and Engineering
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Riho Ikeda
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
| | - Yoshimasa Suzuki
- Department of Molecular Design and Engineering
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Hiroki Iida
- Department of Molecular Design and Engineering
- Graduate School of Engineering
- Nagoya University
- Nagoya 464-8603
- Japan
| | - Naoki Ousaka
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
- Department of Molecular Design and Engineering
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry
- Graduate School of Engineering
- Nagoya University
- Japan
- Department of Molecular Design and Engineering
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