1
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Fokin AA. Long but Strong C-C Single Bonds: Challenges for Theory. CHEM REC 2024; 24:e202300170. [PMID: 37358335 DOI: 10.1002/tcr.202300170] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 06/02/2023] [Indexed: 06/27/2023]
Abstract
Theoretical challenges in describing molecules with anomalously long single C-C bonds are analyzed in terms of the relative contributions of stabilizing and destabilizing intramolecular interactions. Diamondoid dimers that are stable despite the presence of C-C bonds up to 1.7 Å long, as well as other bulky molecules stabilized due to intramolecular noncovalent interactions (London dispersions) are discussed. The unexpected stability of highly crowded molecules, such as diamondoid dimers and tert-butyl-substituted hexaphenylethanes, calls for reconsideration of the "steric effect" traditionally thought to destabilize the molecule. Alternatively, "steric attraction" helps to understand bonding in sterically overloaded molecules, whose structural and energetic analysis requires a proper theoretical description of noncovalent interactions.
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Affiliation(s)
- Andrey A Fokin
- Department of Organic Chemistry, Igor Sikorsky Kyiv Polytechnic Institute, Beresteiskyi Ave 37, Kyiv, Ukraine
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2
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Wang ZS, Bennett SH, Kicin B, Jing C, Pradeilles JA, Thai K, Smith JR, Bacoş PD, Fasano V, Saunders CM, Aggarwal VK. De Novo Synthesis of Dihydrobenzofurans and Indolines and Its Application to a Modular, Asymmetric Synthesis of Beraprost. J Am Chem Soc 2023. [PMID: 37326516 DOI: 10.1021/jacs.3c04582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Dihydrobenzofurans and indolines are important constituents of pharmaceuticals. Herein, we describe a novel strategy for their construction in which the aromatic ring is created de novo through an inverse-electron demand Diels-Alder reaction and cheletropic extrusion sequence of a 2-halothiophene-1,1-dioxide with an enol ether/enamide, followed by aromatization. Unusually, the aromatization process proved to be highly challenging, but it was discovered that treatment of the halocyclohexadienes with a base effected an α-elimination-aromatization reaction. Mechanistic investigation of this step using deuterium-labeling studies indicated the intermediacy of a carbene which undergoes a 1,2-hydrogen shift and subsequent aromatization. The methodology was applied to a modular and stereoselective total synthesis of the antiplatelet drug beraprost in only 8 steps from a key enal-lactone. This lactone provided the core of beraprost to which both its sidechains could be appended through a 1,4-conjugate addition process (lower ω-sidechain), followed by de novo construction of beraprost's dihydrobenzofuran (upper α-sidechain) using our newly developed methodology. Additionally, we have demonstrated the breadth of our newly established protocol in the synthesis of functionalized indolines, which occurred with high levels of regiocontrol. According to density-functional theory (DFT) calculations, the high selectivity originates from attractive London dispersion interactions in the TS of the Diels-Alder reaction.
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Affiliation(s)
- Ze-Shu Wang
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Steven H Bennett
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Bilal Kicin
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Changcheng Jing
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Johan A Pradeilles
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Karen Thai
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - James R Smith
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - P David Bacoş
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Valerio Fasano
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Carla M Saunders
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
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3
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Kolupaeva EV, Ozeryanskii VA. Dialkylamino and trialkylammonium groups in close proximity: intra- and intermolecular ways of formation, structural consequences, and properties. A case of metal-free directed ortho alkylation. NEW J CHEM 2022. [DOI: 10.1039/d2nj02653h] [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
All principal approaches to get to quaternised 1,8-bis(dialkylamino)naphthalenes along with their unusual properties are reported for the first time.
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Affiliation(s)
- Ekaterina V. Kolupaeva
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
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4
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Ikawa T, Yamamoto Y, Heguri A, Fukumoto Y, Murakami T, Takagi A, Masuda Y, Yahata K, Aoyama H, Shigeta Y, Tokiwa H, Akai S. Could London Dispersion Force Control Regioselective (2 + 2) Cyclodimerizations of Benzynes? YES: Application to the Synthesis of Helical Biphenylenes. J Am Chem Soc 2021; 143:10853-10859. [PMID: 34197100 DOI: 10.1021/jacs.1c05434] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In recent years, London dispersion interactions, which are the attractive component of the van der Waals potential, have been found to play an important role in controlling the regio- and/or stereoselectivity of various reactions. Particularly, the dispersion interactions between substrates and catalysts (or ligands) are dominant in various selective catalyzes. In contrast, repulsive steric interactions, rather than the attractive dispersion interactions, between bulky substituents are predominant in most of the noncatalytic reactions. Herein, we demonstrate the first example of London dispersion-controlled noncatalytic (2 + 2) cyclodimerization of substituted benzynes to selectively afford proximal biphenylenes in high yields and regioselectivities, depending on the extent of dispersion interactions in the substituents. This method can be applied for the synthesis of novel helical biphenylenes, which would be fascinating for chemists as these compounds are potential skeletons for ligands, catalysts, and medicines.
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Affiliation(s)
- Takashi Ikawa
- Laboratory of Organic Chemistry, Gifu Pharmaceutical University, Daigaku-Nishi, Gifu 501-1196, Japan
| | - Yuta Yamamoto
- Department of Chemistry, Rikkyo University, Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Akito Heguri
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yutaka Fukumoto
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Tomonari Murakami
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Akira Takagi
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yuto Masuda
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Kenzo Yahata
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Yasuteru Shigeta
- Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
| | - Hiroaki Tokiwa
- Department of Chemistry, Rikkyo University, Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Shuji Akai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
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5
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Ahmadi F, Engel M, Baradarani MM. Synthesis, biological evaluation and molecular docking studies of indeno [1, 2-c] pyrazol derivatives as inhibitors of mitochondrial malate dehydrogenase 2 (MDH2). Bioorg Chem 2021; 110:104779. [PMID: 33689977 DOI: 10.1016/j.bioorg.2021.104779] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 02/05/2021] [Accepted: 02/21/2021] [Indexed: 12/28/2022]
Abstract
Hypoxia inducible factor-1 (HIF-1) is a pivotal transcription factor, which is strongly correlated with the induction of angiogenesis, tumor survival, metastasis, and cell proliferation, making it a pivotal therapeutic target for solid tumor therapeutic agents. Herein, a new series of multi-functional chemical probes were designed including principal groups, viz. adamantyl and indene, at various locations of the parent compound LW6. Molecular docking studies were performed on the designed compounds and their relationship with HIF-1α and malate dehydrogenase 2 (MDH2). Inhibition of MDH2 by our compounds was expected to decrease the NADH level. Indeed, treatment of the breast cancer cell line 4T1 led to a strong reduction of the NADH concentration. The greatest reduction in NADH production in mitochondria was observed with (E)-3-(4-((3r, 5r, 7r)-adamantan-1-yl) phenoxy)-N-(5-(piperidine-1-carbonyl)-1, 4-dihydroindeno [1, 2-c] pyrazol-3-yl) acrylamide (18: IC50 = 59 nM), and has the best inhibitory potential under hypoxic conditions (MCF-7: IC50 = 57 nM). This compound also gave one of the highest docking "higher than the score obtained with LW6 in parallel (-31.63 kcal/mol) in the initial docking runs (PDB Code: 4WLO). Other related compounds with good yields were also synthesized from docking results, and all the synthesized compounds (14, 18, 22, 26, 29, 30) were evaluated in vitro on human adenocarcinoma cell lines.
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Affiliation(s)
- Farzaneh Ahmadi
- Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Iran
| | - Matthias Engel
- Department of Chemistry, Faculty of Science, Saarland University, Germany
| | - Mehdi M Baradarani
- Department of Organic Chemistry, Faculty of Chemistry, Urmia University, Iran
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6
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Iwai K, Yokoyama S, Asahara H, Nishiwaki N. Non-Electronic Aromatic Ring Activation by Simple Steric Repulsion between Substituents in 1-Methylquinolinium Salt Systems. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20190263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Kento Iwai
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
| | - Soichi Yokoyama
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- Research Center for Material Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
| | - Haruyasu Asahara
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- Research Center for Material Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Nagatoshi Nishiwaki
- School of Environmental Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
- Research Center for Material Science and Engineering, Kochi University of Technology, Tosayamada, Kami, Kochi 782-8502, Japan
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7
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Geiger T, Haupt A, Maichle-Mössmer C, Schrenk C, Schnepf A, Bettinger HF. Synthesis and Photodimerization of 2- and 2,3-Disubstituted Anthracenes: Influence of Steric Interactions and London Dispersion on Diastereoselectivity. J Org Chem 2019; 84:10120-10135. [PMID: 31390211 DOI: 10.1021/acs.joc.9b01317] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
There is increased evidence that the effect of bulky groups in organic, organometallic, and inorganic chemistry is not only repulsive but can be attractive because of London dispersion interactions. The influence of the size of primary alkyl substituents in 2- and 2,3-positions of anthracenes on the diastereoselectivity (anti vs syn dimer) of the [π4s + π4s] photoinduced dimerization is investigated. The synthesis of the anthracene derivatives was achieved by Suzuki-Miyaura reaction of 2,3-dibromoanthracene with alkylboronic acids as well as by reduction of anthraquinones that were obtained from 2,3-disubstituted 1,3-butadienes and naphthoquinone followed by dehydrogenation. The mixtures of dianthracene isomers were analyzed with respect to the anti/syn-ratio of the products by X-ray crystallography and nuclear Overhauser effect spectroscopy. While for the 2,3-dimethylanthracene the anti and syn isomers were formed in equal amounts, the anti dimers are the major products in all other cases. A linear correlation (R2 = 0.98) between the steric size (Charton parameter) and the isomeric ratio suggests that the selectivity is dominated by classical repulsive steric effects. An exception is the iso-butyl substituent that produces an increased amount of the syn isomer. It is suggested that this is due to an exalted effect of London dispersion interactions.
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8
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Detmar E, Müller V, Zell D, Ackermann L, Breugst M. Cobalt-catalyzed C-H cyanations: Insights into the reaction mechanism and the role of London dispersion. Beilstein J Org Chem 2018; 14:1537-1545. [PMID: 30013680 PMCID: PMC6036974 DOI: 10.3762/bjoc.14.130] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 06/02/2018] [Indexed: 12/20/2022] Open
Abstract
Carboxylate-assisted cobalt(III)-catalyzed C–H cyanations are highly efficient processes for the synthesis of (hetero)aromatic nitriles. We have now analyzed the cyanation of differently substituted 2-phenylpyridines in detail computationally by density functional theory and also experimentally. Based on our investigations, we propose a plausible reaction mechanism for this transformation that is in line with the experimental observations. Additional calculations, including NCIPLOT, dispersion interaction densities, and local energy decomposition analysis, for the model cyanation of 2-phenylpyridine furthermore highlight that London dispersion is an important factor that enables this challenging C–H transformation. Nonbonding interactions between the Cp* ligand and aromatic and C–H-rich fragments of other ligands at the cobalt center significantly contribute to a stabilization of cobalt intermediates and transition states.
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Affiliation(s)
- Eric Detmar
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany
| | - Valentin Müller
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstraße 2, 37077 Göttingen, Germany
| | - Daniel Zell
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstraße 2, 37077 Göttingen, Germany
| | - Lutz Ackermann
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstraße 2, 37077 Göttingen, Germany
| | - Martin Breugst
- Department für Chemie, Universität zu Köln, Greinstraße 4, 50939 Köln, Germany
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9
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Peterson IV, Svirskaya NM, Kondrasenko AA, Rubaylo AI. 1 H and 13 C NMR spectral assignments of novel adamantyl and di-adamantyl derivatives of 1,2-dihydroxynaphthalenes, 1,8-dihydroxynaphthalenes, 2,3-dihydroxynaphthalenes, 2,6-dihydroxynaphthalenes and 2,7-dihydroxynaphthalenes. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:912-915. [PMID: 27371934 DOI: 10.1002/mrc.4477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 06/20/2016] [Accepted: 06/27/2016] [Indexed: 06/06/2023]
Affiliation(s)
- Ivan V Peterson
- Laboratory of Molecular Spectroscopy and Analysis, Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation.
| | - Nadezhda M Svirskaya
- Laboratory of Molecular Spectroscopy and Analysis, Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
| | - Alexander A Kondrasenko
- Laboratory of Molecular Spectroscopy and Analysis, Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
| | - Anatoliy I Rubaylo
- Laboratory of Molecular Spectroscopy and Analysis, Institute of Chemistry and Chemical Technology of Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
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10
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Sharma C, Joy J, Nethaji M, Jemmis ED, Awasthi SK. Synthetic, Crystallographic, and Computational Studies of Extensively Hydrogen Bonded Bilayers in Thermally Stable Adamantane Hydroperoxides. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600330] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Chiranjeev Sharma
- Chemical Biology Laboratory; Department of Chemistry; University of Delhi; Delhi 110007 India
| | - Jyothish Joy
- Department of Chemistry; Indian Institute of Science Education and Research; Thiruvananthapuram 695016 Kerala India
| | - Munirathinam Nethaji
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Eluvathingal D. Jemmis
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Satish Kumar Awasthi
- Chemical Biology Laboratory; Department of Chemistry; University of Delhi; Delhi 110007 India
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11
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Karunakaran J, Nandakumar M, Senthil Kumar N, Mohanakrishnan AK. Synthetic transformation of 1,3-diarylisobenzofuran-DMAD adducts: a facile preparation of tri-substituted α-naphthols. Org Biomol Chem 2016; 14:4247-59. [DOI: 10.1039/c6ob00628k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
1,3-Diarylisobenzofuran-DMAD adducts upon reaction with BF3·OEt2 in DCM at room temperature underwent a regiospecific 1,2-aryl migration followed by the Krapcho decarboxylation to give tri-substituted α-naphthols in good yields.
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Affiliation(s)
- Jayachandran Karunakaran
- Department of Organic Chemistry
- School of Chemical Sciences University of Madras
- Chennai - 600 025
- India
| | - Meganathan Nandakumar
- Department of Organic Chemistry
- School of Chemical Sciences University of Madras
- Chennai - 600 025
- India
| | - Natarajan Senthil Kumar
- Department of Organic Chemistry
- School of Chemical Sciences University of Madras
- Chennai - 600 025
- India
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12
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Wagner JP, Schreiner PR. London’sche Dispersionswechselwirkungen in der Molekülchemie - eine Neubetrachtung sterischer Effekte. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503476] [Citation(s) in RCA: 190] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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13
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Wagner JP, Schreiner PR. London dispersion in molecular chemistry--reconsidering steric effects. Angew Chem Int Ed Engl 2015; 54:12274-96. [PMID: 26262562 DOI: 10.1002/anie.201503476] [Citation(s) in RCA: 638] [Impact Index Per Article: 70.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Indexed: 12/15/2022]
Abstract
London dispersion, which constitutes the attractive part of the famous van der Waals potential, has long been underappreciated in molecular chemistry as an important element of structural stability, and thus affects chemical reactivity and catalysis. This negligence is due to the common notion that dispersion is weak, which is only true for one pair of interacting atoms. For increasingly larger structures, the overall dispersion contribution grows rapidly and can amount to tens of kcal mol(-1) . This Review collects and emphasizes the importance of inter- and intramolecular dispersion for molecules consisting mostly of first row atoms. The synergy of experiment and theory has now reached a stage where dispersion effects can be examined in fine detail. This forces us to reconsider our perception of steric hindrance and stereoelectronic effects. The quantitation of dispersion energy donors will improve our ability to design sophisticated molecular structures and much better catalysts.
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Affiliation(s)
- J Philipp Wagner
- Institute of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, 35392 Giessen (Germany)
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus-Liebig University, Heinrich-Buff-Ring 58, 35392 Giessen (Germany).
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14
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Hupf E, Lork E, Mebs S, Beckmann J. Sterically Congested 5-Diphenylphosphinoacenaphth-6-yl-silanes and -silanols. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00489] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Emanuel Hupf
- Institut
für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
| | - Enno Lork
- Institut
für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
| | - Stefan Mebs
- Institut
für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Jens Beckmann
- Institut
für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße, 28359 Bremen, Germany
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15
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Talele HR, Hussain F, Bedekar AV. Synthesis and Characterization of New Helical Coumarins. J Heterocycl Chem 2015. [DOI: 10.1002/jhet.2193] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Harish R. Talele
- Department of Chemistry, Faculty of Science; M. S. University of Baroda; Vadodara 390 002 India
| | - Firasat Hussain
- Department of Chemistry, North Campus; University of Delhi; Delhi 110 007 India
| | - Ashutosh V. Bedekar
- Department of Chemistry, Faculty of Science; M. S. University of Baroda; Vadodara 390 002 India
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16
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Amar M, Bar S, Iron MA, Toledo H, Tumanskii B, Shimon LJ, Botoshansky M, Fridman N, Szpilman AM. Design concept for α-hydrogen-substituted nitroxides. Nat Commun 2015; 6:6070. [DOI: 10.1038/ncomms7070] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 12/09/2014] [Indexed: 12/12/2022] Open
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17
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Cai Q, Yang Y, Li DK, Jia FC, Xu C, Wu AX. CuO/I2-mediated intramolecular annulation for the synthesis of 2-aroyl-3-hydroxy-4-iodonaphthalenes. RSC Adv 2015. [DOI: 10.1039/c5ra17651d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
A novel method for the direct synthesis of 2-aroyl-3-hydroxy-4-iodonaphthalenes has been developed via CuO/I2-mediated domino reactions.
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Affiliation(s)
- Qun Cai
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - Yan Yang
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - Deng-Kui Li
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - Feng-Cheng Jia
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - Cheng Xu
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
| | - An-Xin Wu
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan 430079
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18
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Yamaguchi M, Shigeno M, Saito N, Yamamoto K. Synthesis, Double-Helix Formation, and Higher-Assembly Formation of Chiral Polycyclic Aromatic Compounds: Conceptual Development of Polyketide Aldol Synthesis. CHEM REC 2013; 14:15-27. [DOI: 10.1002/tcr.201300014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Indexed: 01/23/2023]
Affiliation(s)
- Masahiko Yamaguchi
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba Sendai 980-8578 Japan
| | - Masanori Shigeno
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba Sendai 980-8578 Japan
| | - Nozomi Saito
- International Advanced Research and Education Organization; Tohoku University; Sendai 980-8578 Japan
| | - Koji Yamamoto
- Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba Sendai 980-8578 Japan
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19
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Yamamoto K, Oyamada N, Xia S, Kobayashi Y, Yamaguchi M, Maeda H, Nishihara H, Uchimaru T, Kwon E. Equatorenes: Synthesis and Properties of Chiral Naphthalene, Phenanthrene, Chrysene, and Pyrene Possessing Bis(1-adamantyl) Groups at the Peri-position. J Am Chem Soc 2013; 135:16526-32. [DOI: 10.1021/ja407800e] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | | | | | | | | | - Hiroaki Maeda
- Department
of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, Japan
| | - Hiroshi Nishihara
- Department
of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, Japan
| | - Tadafumi Uchimaru
- Nanosystem
Research Institute, AIST, Tsukuba, Ibaraki, 305-8568, Japan
| | - Eunsang Kwon
- Research
and Analytical Center for Giant Molecules, Tohoku University, Japan
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20
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Talele HR, Bedekar AV. Synthesis of chiral bis-oxazines: a preliminary assessment of helical conformational framework. Org Biomol Chem 2012; 10:8579-82. [PMID: 23042208 DOI: 10.1039/c2ob26669e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of novel naphthalene attached bis-oxazines were synthesized and characterized. The bis-oxazines were studied by VT-NMR analysis to assess the possibility of conformational twist. The bis-oxazine prepared from (l)-methylvalinate show a helical conformational twist in the single crystal X-ray analysis. Three isomers of bis-oxazines were prepared from chiral α-methylbenzyl amines, the meso isomer showed small optical rotation probably indicating the helical conformational twist in the molecule.
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Affiliation(s)
- Harish R Talele
- Department of Chemistry, Faculty of Science, M.S. University of Baroda, Vadodara 390 002, India
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21
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Takeda T, Tobe Y. Synthesis and structure of 1,4,5,8-tetraethynylnaphthalene derivatives. Chem Commun (Camb) 2012; 48:7841-3. [PMID: 22751092 DOI: 10.1039/c2cc33740a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Takashi Takeda
- Division of Frontier Materials Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan
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22
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Ikawa T, Tokiwa H, Akai S. Experimental and Theoretical Studies on Regiocontrol of Benzyne Reactions Using Silyl and Boryl Directing Groups. J SYN ORG CHEM JPN 2012. [DOI: 10.5059/yukigoseikyokaishi.70.1123] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Delley RJ, Bandyopadhyay S, Fox MA, Schliehe C, Hodgson DRW, Hollfelder F, Kirby AJ, O'Donoghue AC. peri-Dimethylamino substituent effects on proton transfer at carbon in α-naphthylacetateesters: a model for mandelate racemase. Org Biomol Chem 2012; 10:590-6. [DOI: 10.1039/c1ob06525d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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