1
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The effect of diphenylethane side-chain substituents on dibenzocyclohexadiene formation and their inhibition of α-synuclein aggregation in vitro. Bioorg Med Chem 2023; 78:117147. [PMID: 36587551 DOI: 10.1016/j.bmc.2022.117147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/13/2022] [Accepted: 12/22/2022] [Indexed: 12/27/2022]
Abstract
The naturally-occurring di-catechol lignan nordihydroguaiaretic acid (NDGA) and an analog without methyl groups on the butyl linker both undergo intramolecular cyclization at pH 7.4 to form dibenzocyclooctadienes. Both NDGA and these dibenzocyclooctadienes have been shown to prevent in vitro aggregation of α-synuclein, an intrinsically disordered protein associated with Parkinson's disease. NDGA possesses two vicinal methyl groups on the butyl linker and the presence of these methyl groups attenuates the rate of intramolecular cyclization versus the unsubstituted analog, in opposition to the anticipated Thorpe-Ingold effect, likely due to steric repulsions during cyclization. Numerous 1,2-bis-ethane di-catechols are known to inhibit α-synuclein aggregation in vitro and we hypothesize that these compounds undergo a similar intramolecular cyclization and the cyclized products may be responsible for the activity. To test this hypothesis we prepared a series of 1,2-bis-ethane di-catechols with 0, 2 and 4 methyl substituents on the linker. We have confirmed that these compounds undergo intramolecular cyclization to form dibenzocyclohexadienes and that steric interactions between the methyl substituents leads to an increase in the rate of intramolecular cyclization, which is in contrast to what was observed for lignan di-catechols. The rate of cyclization to form six-membered rings is 10-30 times more rapid than formation of eight membered rings and the dibenzocyclohexadienes also prevent in vitro aggregation of α-synuclein.
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2
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Malakhova M, Gorbunov A, Ozerov N, Korniltsev I, Ermolov K, Bezzubov S, Kovalev V, Vatsouro I. Triazolated calix[4]semitubes: assembling strategies towards long multicalixarene architectures. Org Chem Front 2022. [DOI: 10.1039/d2qo00432a] [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
Cone and 1,3-alternate calix[4]arenes bearing pairs of 2-azidoethyl or propargyl groups, and 1,3-alternate calix[4]arenes having four 2-azidoethyl, four propargyl groups or pairs of 2-azidoethyl and silylated propargyl groups were explored...
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3
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Krzyżanowski M, Nowicka AM, Kazimierczuk K, Durka K, Lulinski S, Kasprzak A. Design of a D3h-symmetry prismatic tris-(ferrocene-1,1ʹ-diyl) molecular cage bearing boronate ester linkages. Dalton Trans 2022; 51:10601-10611. [DOI: 10.1039/d2dt01306a] [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
This paper presents a simple, highly selective, and efficient (isolated yield 68%) synthesis of a novel D3h-symmetry prismatic tris-(ferrocene-1,1ʹ-diyl) organic cage (FcB-cage) by incorporating the boronate ester as a linkage...
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4
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Giraldi E, Scopelliti R, Fadaei-Tirani F, Severin K. Metal-Stabilized Boronate Ester Cages. Inorg Chem 2021; 60:10873-10879. [PMID: 34291934 DOI: 10.1021/acs.inorgchem.1c01719] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular cages with arylboronate ester caps at the vertices are described. The cages were obtained by metal-templated polycondensation reactions of a tris(2-formylpyridine oxime) ligand with arylboronic acids. Suited templates are triflate or triflimide salts of ZnII, FeII, CoII, or MnII. In the products, the metal ions are coordinated internally to the pyridyl and oximato N atoms adjacent to the boronate ester, resulting in an improved hydrolytic stability of the latter. It is possible to decorate the cages with cyano or aldehyde groups using functionalized arylboronic acids. The aldehyde groups allow for a postsynthetic modification of the cages via an imine bond formation.
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Affiliation(s)
- Erica Giraldi
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Farzaneh Fadaei-Tirani
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Kay Severin
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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5
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Nakamura M, Tsukamoto Y, Ueta T, Sei Y, Fukushima T, Yoza K, Kobayashi K. Cavitand-Based Pd-Pyridyl Coordination Capsules: Guest-Induced Homo- or Heterocapsule Selection and Applications of Homocapsules to the Protection of a Photosensitive Guest and Chiral Capsule Formation. Chem Asian J 2020; 15:2218-2230. [PMID: 32495490 DOI: 10.1002/asia.202000603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Indexed: 11/08/2022]
Abstract
A 2 : 4 mixture of tetrakis[4-(4-pyridyl)phenyl]cavitand (1) or tetrakis[4-(4-pyridyl)phenylethynyl]cavitand (2) and Pd(dppp)(OTf)2 self-assembles into a homocapsule {12 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C1) or {22 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C2), respectively, through Pd-Npy coordination bonds. A 1 : 1 : 4 mixture of 1, 2, and Pd(dppp)(OTf)2 produced a mixture of homocapsules C1, C2, and a heterocapsule {1 ⋅ 2 ⋅ [Pd(dppp)]4 }8+ ⋅ (TfO- )8 (C3) in a 1 : 1 : 0.98 mole ratio. Selective formation (self-sorting) of homocapsules C1 and C2 or heterocapsule C3 was controlled by guest-induced encapsulation under thermodynamic control. Applications of Pd-Npy coordination capsules with the use of 1 were demonstrated. Capsule C1 serves as a guard nanocontainer for trans-4,4'-diacetoxyazobenzene to protect against the trans-to-cis photoisomerization by encapsulation. A chiral capsule {12 ⋅ [Pd((R)-BINAP)]4 }8+ ⋅ (TfO- )8 (C5) was also constructed. Capsule C5 induces supramolecular chirality with respect to prochiral 2,2'-bis(alkoxycarbonyl)-4,4'-bis(1-propynyl)biphenyls by diastereomeric encapsulation through the asymmetric suppression of rotation around the axis of the prochiral biphenyl moiety.
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Affiliation(s)
- Munechika Nakamura
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Yoshimi Tsukamoto
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Takuro Ueta
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Yoshihisa Sei
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Kenji Yoza
- Bruker axs, 3-9-B Moriya, Kanagawa-ku, Yokohama, 221-0022, Japan
| | - Kenji Kobayashi
- Department of Chemistry Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan.,Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
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6
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Harada K, Sekiya R, Haino T. A Regulable Internal Cavity inside a Resorcinarene-Based Hemicarcerand. Chemistry 2020; 26:5810-5817. [PMID: 32011768 DOI: 10.1002/chem.201905805] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Indexed: 01/29/2023]
Abstract
Covalent organic capsules, such as carcerands and hemicarcerands, are an interesting class of molecular hosts. These container molecules have confined spaces capable of hosting small molecules, although the fact that the size of the inner cavities cannot be changed substantially limits the scope of their applications. The title covalently linked container was produced by metal-directed dimerization of a resorcinarene-based cavitand having four 2,2'-bipyridyl arms on the wide rim followed by olefin metathesis at the vertices of the resulting capsule with a second-generation Grubbs catalyst. The covalently linked bipyridyl arms permit expansion of the inner cavity by demetalation. This structural change influences the molecular recognition properties; the metal-coordinated capsule recognizes only 4,4'-diacetoxybiphenyl, whereas the metal-free counterpart can encapsulate not only 4,4'-diacetoxybiphenyl, but also 2,5-disubstituted-1,4-bis(4-acetoxyphenylethynyl)benzene, which is 9.4 Å longer than the former guest. Molecular mechanics calculations predict that the capsule expands the internal cavity to encapsulate the long guest by unfolding the folded conformation of the alkyl chains, which demonstrates the flexible and regulable nature of the cavity. Guest competition experiments show that the preferred guest can be switched by metalation and demetalation. This external-stimuli-responsive guest exchange can be utilized for the development of functional supramolecular systems controlling the uptake, transport, and release of chemicals.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
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7
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Lauer JC, Pang Z, Janßen P, Rominger F, Kirschbaum T, Elstner M, Mastalerz M. Host-Guest Chemistry of Truncated Tetrahedral Imine Cages with Ammonium Ions. ChemistryOpen 2020; 9:183-190. [PMID: 32025463 PMCID: PMC6996569 DOI: 10.1002/open.201900357] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/10/2020] [Indexed: 01/29/2023] Open
Abstract
Three shape-persistent [4+4] imine cages with truncated tetrahedral geometry with different window sizes were studied as hosts for the encapsulation of tetra-n-alkylammonium salts of various bulkiness. In various solvents the cages behave differently. For instance, in dichloromethane the cage with smallest window size takes up NEt4+ but not NMe4+, which is in contrast to the two cages with larger windows hosting both ions. To find out the reason for this, kinetic experiments were carried out to determine the velocity of uptake but also to deduce the activation barriers for these processes. To support the experimental results, calculations for the guest uptakes have been performed by molecular mechanics' simulations. Finally, the complexation of pharmaceutical interested compounds, such as acetylcholine, muscarine or denatonium have been determined by NMR experiments.
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Affiliation(s)
- Jochen C. Lauer
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Ziwei Pang
- Institut für Physikalische Chemie Theoretische Chemische BiologieUniversität Karlsruhe Geb. 30.44Kaiserstr. 1276131KarlsruheGermany
| | - Paul Janßen
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Frank Rominger
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Tobias Kirschbaum
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Marcus Elstner
- Institut für Physikalische Chemie Theoretische Chemische BiologieUniversität Karlsruhe Geb. 30.44Kaiserstr. 1276131KarlsruheGermany
| | - Michael Mastalerz
- Organisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
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8
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Esteve F, Altava B, Bolte M, Burguete MI, García-Verdugo E, Luis SV. Highly Selective Anion Template Effect in the Synthesis of Constrained Pseudopeptidic Macrocyclic Cyclophanes. J Org Chem 2020; 85:1138-1145. [PMID: 31858803 DOI: 10.1021/acs.joc.9b03048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report the synthesis of a novel family of constrained pseudopeptidic macrocyclic compounds containing the hexahydropyrrolo[3,4-f]isoindolocyclophane scaffold and involving four coupled substitution reactions in the macrocyclization process. Although the increase in the number of steps involved in the macrocyclization could lead to a larger number of possible side products, the optimization of the methodology and the study of the driving forces have made it possible to obtain the desired macrocycles in excellent yields. A thorough computational study has been carried out to understand the macrocyclization process, and the results obtained nicely agree with experimental data. Moreover, the bromide anion had a clear catalytic template effect in the macrocyclization reaction, and surprisingly, the chloride anion had a negative template effect in opposition to the results obtained for analogous macrocycles. The parameters responsible for the specific kinetic template effect observed have been studied in detail.
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Affiliation(s)
- Ferran Esteve
- Departamento de Química Inorgánica y Orgánica , Universitat JaumeI , Av. Sos Baynat s/n , 12071 Castellón , Spain
| | - Belen Altava
- Departamento de Química Inorgánica y Orgánica , Universitat JaumeI , Av. Sos Baynat s/n , 12071 Castellón , Spain
| | - Michael Bolte
- Institut fur Anorganische Chemie , J. W. Goethe-Universitat Frankfurt , 60438 Frankfurt/Main , Germany
| | - M Isabel Burguete
- Departamento de Química Inorgánica y Orgánica , Universitat JaumeI , Av. Sos Baynat s/n , 12071 Castellón , Spain
| | - Eduardo García-Verdugo
- Departamento de Química Inorgánica y Orgánica , Universitat JaumeI , Av. Sos Baynat s/n , 12071 Castellón , Spain
| | - Santiago V Luis
- Departamento de Química Inorgánica y Orgánica , Universitat JaumeI , Av. Sos Baynat s/n , 12071 Castellón , Spain
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9
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Park YS, Kim Y, Paek K. Specific Encapsulation of Acetylcholine Chloride by a Self-Assembled Molecular Capsule with Sulfonamido Moiety. Org Lett 2019; 21:8300-8303. [PMID: 31560557 DOI: 10.1021/acs.orglett.9b03013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
New molecular capsule 12, which encapsulates only acetylcholine chloride in the ion-pair form, has been developed. Cavitand 1 with four sulfonamido moieties on the upper rim of tetraimino-cavitand self-assembled to form a stable molecular capsule in the presence of an acetylcholine chloride guest through eight intermolecular -NH···O═S hydrogen bonds, two from each of the four paired sulfonamide units.
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Affiliation(s)
- Yeon Sil Park
- Department of Chemistry , Soongsil University , Seoul 06978 , Korea
| | - Yangryeong Kim
- Department of Chemistry , Soongsil University , Seoul 06978 , Korea
| | - Kyungsoo Paek
- Department of Chemistry , Soongsil University , Seoul 06978 , Korea
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10
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Abstract
The combination of supramolecular aggregation of collagen model peptides with reversible covalent end‐capping of the formed triple helix in a single experimental set‐up yielded minicollagens, which were characterized by a single melting temperature. In spite of the numerous possible reaction intermediates, a specific synthetic collagen with a leading, middle and trailing strand is formed in a highly cooperative self‐assembly process.
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Affiliation(s)
- Christoph Priem
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032, Marburg, Germany
| | - Armin Geyer
- Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032, Marburg, Germany
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11
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Mondal P, Banerjee S, Rath SP. Controlling the Photophysics of Aromatic Guests Using a Cyclic Porphyrin Dimer: Synthesis, Structure, and Encapsulation‐Mediated “ON‐OFF” Switch. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900639] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Pritam Mondal
- Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Sayantani Banerjee
- Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
| | - Sankar Prasad Rath
- Department of Chemistry Indian Institute of Technology Kanpur 208016 Kanpur India
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12
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Harada K, Sekiya R, Maehara T, Haino T. Substituent-controlled racemization of dissymmetric coordination capsules. Org Biomol Chem 2019; 17:4729-4735. [PMID: 30946423 DOI: 10.1039/c9ob00388f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the effect of substituents (methyl, isopropyl, methoxy, and methoxyphenyl) at the 6'-position of the 2,2'-bipyridyl arms on the racemization of dissymmetric coordination capsules 1a-d. When the capsules included (R)-4,4'-diacetoxy-2,2'-benzyloxycarboxyl-biphenyl ((R)-3), the (M)-helical conformer was enriched with a diastereomeric excess (de%) of >98% for 1a, 31% for 1b, 81% for 1c and 75% for 1d. The entrapped guests in 1a, 1c and 1d can be removed by washing the solid containing the host-guest complexes with diethyl ether. The rate of racemization in THF follows the order of 1c > 1d ≫ 1a. X-ray crystal structural analysis and density functional theory calculation of model complex 4c indicate a distorted tetrahedral coordination of the Cu(i) center, and UV-vis absorption spectroscopy indicates similar coordination environments in 1c and 4c. A series of experiments demonstrates that the racemization rate depends on the dihedral angles of the bipyridyl arms, and the angles are regulated by the substituents. The methoxy and methoxyphenyl substituents in 1c and 1d enlarge the dihedral angles of the bipyridyl arms. This facilitates the access of solvent molecules to the Cu(i) centers and promotes racemization. The slower racemization of 1d can be ascribed to the steric protection of the Cu(i) centers from incoming solvent molecules by the p-methoxyphenyl group.
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Affiliation(s)
- Kentaro Harada
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
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13
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Togari Y, Hirota S, Kitagawa H, Tsukamoto Y, Kobayashi K. Hydrogen-bonded six-component assembly for capsule formation based on tetra(4-pyridyl)cavitand and isophthalic acid linker and its application to photoresponsive capsule. Org Biomol Chem 2018; 16:7626-7635. [PMID: 30283949 DOI: 10.1039/c8ob02115e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two molecules of tetra(4-pyridyl)cavitand 1 and four molecules of isophthalic acid linker 2a with a triethylene glycol monomethyl ether (TEG) group self-assembled into a six-component capsule 12·2a4 through eight pyNHO2C hydrogen bonds, which encapsulates one molecule of guest G such as bis(4-acetoxyphenyl)acetylene and hexakis(4-iodophenyl)benzene to form G@(12·2a4). Guest-encapsulation ability and selectivity of 12·2a4 were revealed. trans-5-(p-Substituted-phenylazo)isophthalic acid with two dichotomous branching TEG groups trans-2b serves as a photoresponsive linker to form 12·(trans-2b)4, which moderately reduced guest-encapsulation ability upon photoisomerization (at the photostationary state, 10% guest release upon subunit-trans-2b/subunit-cis-2b = 18 : 82).
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Affiliation(s)
- Yuka Togari
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
| | - Shiori Hirota
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
| | - Hitomi Kitagawa
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
| | - Yoshimi Tsukamoto
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
| | - Kenji Kobayashi
- Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan.
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14
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Wagner P, Rominger F, Mastalerz M. Switching the Statistical C
3
/C
1
Ratio in the Threefold Aromatic Substitution of Tribenzotriquinacenes towards the C
3
Isomer. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806332] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Philippe Wagner
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Frank Rominger
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Michael Mastalerz
- Organisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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15
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Wagner P, Rominger F, Mastalerz M. Switching the Statistical C 3 /C 1 Ratio in the Threefold Aromatic Substitution of Tribenzotriquinacenes towards the C 3 Isomer. Angew Chem Int Ed Engl 2018; 57:11321-11324. [PMID: 29938890 DOI: 10.1002/anie.201806332] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Indexed: 12/21/2022]
Abstract
Tribenzotriquinacene (TBTQ) is a bowl-shaped molecule that has been widely used as a molecular building block in supramolecular and materials chemistry. Especially C3 -symmetric threefold-substituted TBTQs are interesting for these purposes. Until now a general and selective synthetic approach to those C3 -symmetric products was lacking, mainly because the typically used electrophilic aromatic substitution reactions of the parent TBTQ hydrocarbons produce predominantly the C1 isomer over the C3 isomer (3:1 statistical ratio). Herein we introduce a threefold borylation of TBTQ with the C3 isomer as the main product (2.6:1 C3 /C1 ratio). The borylated TBTQ can be converted in good yields into other C3 -symmetric TBTQs, thus allowing straightforward synthetic access to new building blocks for supramolecular and materials chemistry.
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Affiliation(s)
- Philippe Wagner
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Michael Mastalerz
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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16
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Shape-Persistent Tetrahedral [4+6] Boronic Ester Cages with Different Degrees of Fluoride Substitution. Chemistry 2018; 24:11438-11443. [DOI: 10.1002/chem.201802123] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 06/12/2018] [Indexed: 12/18/2022]
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17
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Nakada K, Kondo S, Matsumoto Y, Yamanaka M. Synthesis of a C3-symmetric tris-imine via dynamic covalent bond formation between a trialdehyde and a triamine. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.10.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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18
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Ono K, Tohyama Y, Uchikura T, Kikuchi Y, Fujii K, Uekusa H, Iwasawa N. Control of the reversibility during boronic ester formation: application to the construction of ferrocene dimers and trimers. Dalton Trans 2017; 46:2370-2376. [DOI: 10.1039/c6dt04845e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Equilibration of boronic esters during boronic ester formation was controlled using protic or aprotic solvents under neutral conditions.
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Affiliation(s)
- Kosuke Ono
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Yohei Tohyama
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | | | - Yuji Kikuchi
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Kotaro Fujii
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Hidehiro Uekusa
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
| | - Nobuharu Iwasawa
- Department of Chemistry
- Tokyo Institute of Technology
- Tokyo 152-8551
- Japan
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Mitsui M, Higashi K, Hirumi Y, Kobayashi K. Effects of Supramolecular Encapsulation on Photophysics and Photostability of a 9,10-Bis(arylethynyl)anthracene-Based Chromophore Revealed by Single-Molecule Fluorescence Spectroscopy. J Phys Chem A 2016; 120:8317-8325. [PMID: 27754670 DOI: 10.1021/acs.jpca.6b08734] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The effects of supramolecular encapsulation on the photophysics and photostability of a highly fluorescent dimeric derivative of 2,6-diacetoxy-9,10-bis(arylethynyl)anthracene (G2) were investigated by single-molecule fluorescence spectroscopy (SMFS). The fluorescence properties of free-G2 and its self-assembled boronic ester encapsulation complex, G2@(Cap)2, were compared in solution and a glassy polymer film. The fluorescence spectral characteristics and theoretical calculations suggest that the environment affects the excited-state conformation and subsequent fluorescence emission of G2@(Cap)2. In particular, in the liquid and polymer environments, G2@(Cap)2 emits a fluorescence photon in the planar and twist conformation, respectively, whereas the fluorescence-emitting conformation of free-G2 is planar in both environments. The luminous conformation differences between free-G2 and G2@(Cap)2 in polymer are reflected in the intersystem crossing (ISC) parameters (the ISC quantum yield and triplet lifetime), as determined by fluorescence autocorrelation analysis. The photobleaching yield revealed a 3-fold enhancement in the photostability of encapsulated G2 (relative to free-G2). Under the SMFS measurement conditions, the photostability of the encapsulation complex was independent of the guest's photostability and appeared to be dominated by the thermal stability of the Cap host molecule.
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Affiliation(s)
- Masaaki Mitsui
- Department of Chemistry, College of Science, Rikkyo University , 3-34-1, Nishiikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Koji Higashi
- Department of Chemistry, Faculty of Science, Shizuoka University , 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Yohei Hirumi
- Department of Chemistry, Faculty of Science, Shizuoka University , 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - Kenji Kobayashi
- Department of Chemistry, Faculty of Science, Shizuoka University , 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
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Zhang L, Jin Q, Liu M. Enantioselective Recognition by Chiral Supramolecular Gels. Chem Asian J 2016; 11:2642-2649. [DOI: 10.1002/asia.201600441] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 05/15/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Li Zhang
- Beijing National Laboratory for Molecular Science (BNLMS); CAS Key Laboratory of Colloid, Interface; and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
| | - Qingxian Jin
- Henan Provincial Key Laboratory of Surface and Interface Science; Zhengzhou University of Light Industry; Zhengzhou Henan 450002 P.R. China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Science (BNLMS); CAS Key Laboratory of Colloid, Interface; and Chemical Thermodynamics; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P.R. China
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21
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Imamura T, Maehara T, Sekiya R, Haino T. Frozen Dissymmetric Cavities in Resorcinarene-Based Coordination Capsules. Chemistry 2016; 22:3250-3254. [DOI: 10.1002/chem.201505183] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Taisuke Imamura
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Takeshi Maehara
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Ryo Sekiya
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan
| | - Takeharu Haino
- Department of Chemistry; Graduate School of Science; Hiroshima University; 1-3-1 Kagamiyama Higashi-Hiroshima Hiroshima 739-8526 Japan
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22
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Wuttke A, Fischer SN, Nebel A, Marsch M, Geyer A. Improved δ-valerolactam templates for the assembly of Aβ-miniamyloids by boronic ester formation. Org Biomol Chem 2016; 14:5032-48. [DOI: 10.1039/c6ob00565a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Numerically defined oligomers of amyloidogenic peptides were obtained by boronic ester formation with synthetic polyol templates.
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Affiliation(s)
- André Wuttke
- Institute of Chemistry
- Philipps-University Marburg
- 35032 Marburg
- Germany
| | | | - Annika Nebel
- Institute of Chemistry
- Philipps-University Marburg
- 35032 Marburg
- Germany
| | - Michael Marsch
- Institute of Chemistry
- Philipps-University Marburg
- 35032 Marburg
- Germany
| | - Armin Geyer
- Institute of Chemistry
- Philipps-University Marburg
- 35032 Marburg
- Germany
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