1
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Watanabe T, Oga K, Matoba H, Nagatomo M, Inoue M. Total Synthesis of Taxol Enabled by Intermolecular Radical Coupling and Pd-Catalyzed Cyclization. J Am Chem Soc 2023; 145:25894-25902. [PMID: 37972241 DOI: 10.1021/jacs.3c10658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Taxol (1) is a clinically used antineoplastic diterpenoid. The tetracyclic ring system comprises a 6/8/6-membered carbocycle (ABC-ring) and a fused oxetane ring (D-ring) embedded with a bridgehead double bond and decorated with multiple oxygen functionalities. Here, we report a convergent total synthesis of this exceedingly complex natural product. The C-ring fragment was designed to possess a bromocyclohexenone and an extra tetrahydrofuran ring to control the reactivity and selectivity, as well as to minimize functional group manipulations en route to 1. The α-alkoxyacyl telluride of the A-ring served as a radical precursor, and intermolecular radical coupling with the C-ring realized the installation of the C2- and C3-stereocenters and reductive removal of the bromide. After the C8-quaternary stereocenter was constructed by exploiting the three-dimensional shape of the intermediate, the C11-vinyl triflate of A-ring and the C8-methyl ketone of C-ring were utilized for Pd(0)-catalyzed cyclization of the central eight-membered B-ring with the bridgehead olefin. Adjustment of the oxidation level and attachment of the oxetane D-ring completed the total synthesis of 1 (28 steps, as the longest linear sequence). The fragment design principle and implementation of the powerful radical coupling reaction described in the present synthesis provide valuable information for planning and executing syntheses of diverse densely oxygenated terpenoids.
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Affiliation(s)
- Takahiro Watanabe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Kyohei Oga
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Hiroaki Matoba
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
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2
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Thery V, Barra C, Simeoni A, Pecaut J, Tomás-Mendivil E, Martin D. Bending Enamine Patterns of Stabilized Pentalenes into "Polymethine Ylides". Org Lett 2023; 25:560-564. [PMID: 36646641 DOI: 10.1021/acs.orglett.3c00037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We report the synthesis and structural study of 2-substituted 1,3-bis(dimethylamino)pentalenes. The two electrons donating substituents shift the formally anti-aromatic pattern toward more suitable polarized structures. A subtle steric trade-off can result either in planar cyclopentadienyl vinamidiniums or in distorted structures featuring a pyramidalized ylidic carbon adjacent to a stabilized π-conjugated iminium (polymethine). This latter pattern mimics a postulated activated distorted geometry for key Breslow intermediates in the active site of thiamine-dependent enzymes. It highlights how the energetic drive to avoid anti-aromaticity can be used to access models for unconventional distorted conformations of organic molecules.
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Affiliation(s)
- Valentin Thery
- Univ. Grenoble-Alpes, UMR CNRS-UGA 5250, CS 40700, 38058 Grenoble, France
| | - Cyriac Barra
- Univ. Grenoble-Alpes, UMR CNRS-UGA 5250, CS 40700, 38058 Grenoble, France
| | - Alexandra Simeoni
- Univ. Grenoble-Alpes, UMR CNRS-UGA 5250, CS 40700, 38058 Grenoble, France
| | - Jacques Pecaut
- Univ. Grenoble Alpes, CEA, CNRS, INAC-SyMMES, UMR 5819, 38000 Grenoble, France
| | | | - David Martin
- Univ. Grenoble-Alpes, UMR CNRS-UGA 5250, CS 40700, 38058 Grenoble, France
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3
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Koike T, Honda S, Iwamoto T. An Isolable 2,4-Diaminotetrasilabicyclo[1.1.0]but-1(3)-ene: Effects of Amino Groups at the Bridge Positions. CHEM LETT 2022. [DOI: 10.1246/cl.210595] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Taichi Koike
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Shunya Honda
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8578, Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Miyagi 980-8578, Japan
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4
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Wu Y, Zhang J, Xie Z. How long a C–C bond can be? An example of extraordinary long C–C single bond in 1,2-diarylamino-o-carborane. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.04.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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5
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Ohno K, Satoh H, Iwamoto T. Quantum chemical exploration of new π-electron systems: Capsule-formed dimers of polycyclic aromatic hydrocarbons. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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6
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Wu JI, Eikema Hommes NJ, Lenoir D, Bachrach SM. The quest for a triplet ground‐state alkene: Highly twisted C═C double bonds. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Judy I. Wu
- Department of Chemistry University of Houston Houston TX USA
| | - Nico J.R. Eikema Hommes
- Computer Chemistry Center, Department of Chemistry and Pharmacy Friedrich‐Alexander University Erlangen‐Nürnberg Erlangen Germany
| | - Dieter Lenoir
- Helmholtz Center München, Molecular Exposomics Neuherberg Germany
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7
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Locke GM, Bernhard SSR, Senge MO. Nonconjugated Hydrocarbons as Rigid-Linear Motifs: Isosteres for Material Sciences and Bioorganic and Medicinal Chemistry. Chemistry 2019; 25:4590-4647. [PMID: 30387906 DOI: 10.1002/chem.201804225] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Revised: 10/20/2018] [Indexed: 01/02/2023]
Abstract
Nonconjugated hydrocarbons, like bicyclo[1.1.1]pentane, bicyclo[2.2.2]octane, triptycene, and cubane are a unique class of rigid linkers. Due to their similarity in size and shape they are useful mimics of classic benzene moieties in drugs, so-called bioisosteres. Moreover, they also fulfill an important role in material sciences as linear linkers, in order to arrange various functionalities in a defined spatial manner. In this Review article, recent developments and usages of these special, rectilinear systems are discussed. Furthermore, we focus on covalently linked, nonconjugated linear arrangements and discuss the physical and chemical properties and differences of individual linkers, as well as their application in material and medicinal sciences.
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Affiliation(s)
- Gemma M Locke
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Stefan S R Bernhard
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
| | - Mathias O Senge
- School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity Biomedical Sciences Institute, Trinity College Dublin, The University of Dublin, 152-160 Pearse Street, Dublin, 2, Ireland
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8
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Nukazawa T, Kosai T, Honda S, Ishida S, Iwamoto T. Reactions of a tetrasilabicyclo[1.1.0]but-1(3)-ene with carbon tetrachloride and methanol. Dalton Trans 2019; 48:10874-10880. [DOI: 10.1039/c9dt01627a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A tetrasilabicyclo[1.1.0]but-1(3)-ene was synthesized as orange crystals and its reactions were investigated.
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Affiliation(s)
- Takumi Nukazawa
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Aoba-ku
- Sendai 980-8578
| | - Tomoyuki Kosai
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Aoba-ku
- Sendai 980-8578
| | - Shunya Honda
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Aoba-ku
- Sendai 980-8578
| | - Shintaro Ishida
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Aoba-ku
- Sendai 980-8578
| | - Takeaki Iwamoto
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Aoba-ku
- Sendai 980-8578
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9
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Camps P, Lozano D, Barbaraci C, Font-Bardia M, Luque FJ, Estarellas C. Generation and Reactions of an Octacyclic Hindered Pyramidalized Alkene. J Org Chem 2018; 83:5420-5430. [PMID: 29652147 DOI: 10.1021/acs.joc.8b00212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Octacyclo[10.6.1.01,10.03,7.04,9.08,19.011,16.013,17]nonadeca-5,8,14-triene (27), a hindered pyramidalized alkene, has been generated from a diiodide precursor. Contrary to the usual behavior of known pyramidalized alkenes, no Diels-Alder adducts were obtained from the present alkene when it was generated by different standard procedures in the presence of different dienes. However, products derived from the reduction, t-BuLi addition, condensation with the solvent, or dimerization were isolated from these reactions, depending on the conditions used to generate it. No [2 + 2] cross product among this pyramidalized alkene and tricyclo[3.3.1.03,7]non-3(7)-ene was formed when a mixture of the corresponding precursor diiodides was reacted with sodium amalgam. The analysis of selected geometrical and orbital parameters determined from quantum mechanical calculations indicates that the degree of pyramidalization of this alkene and its higher steric hindrance compared with other polycyclic pyramidalized alkenes may explain its peculiar reactivity.
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Affiliation(s)
- Pelayo Camps
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia i Ciències de l'Alimentació , Institut de Biomedicina (IBUB), Universitat de Barcelona , Av. Joan XXIII 27-31 , 08028 Barcelona , Spain
| | - David Lozano
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia i Ciències de l'Alimentació , Institut de Biomedicina (IBUB), Universitat de Barcelona , Av. Joan XXIII 27-31 , 08028 Barcelona , Spain
| | - Carla Barbaraci
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia i Ciències de l'Alimentació , Institut de Biomedicina (IBUB), Universitat de Barcelona , Av. Joan XXIII 27-31 , 08028 Barcelona , Spain
| | - Merce Font-Bardia
- Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals , Universitat de Barcelona , Martí Franquès s/n , 08028 Barcelona , Spain.,Unitat de Difracció de RX, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB) , Solé i Sabarís 1-3 , 08028 Barcelona , Spain
| | - F Javier Luque
- Departament de Nutrició, Ciències de l'Alimentació i Gastronomia, Facultat de Farmàcia i Ciències de l'Alimentació , Universitat de Barcelona , Av. Prat de la Riba 171 , 08921 Santa Coloma de Gramenet , Spain.,Institut de Biomedicina (IBUB) and Institut de Química Teòrica i Computacional (IQTCUB) , Universitat de Barcelona , Av. Joan XXIII 27-31 , 08028 Barcelona , Spain
| | - Carolina Estarellas
- Departament de Nutrició, Ciències de l'Alimentació i Gastronomia, Facultat de Farmàcia i Ciències de l'Alimentació , Universitat de Barcelona , Av. Prat de la Riba 171 , 08921 Santa Coloma de Gramenet , Spain.,Institut de Biomedicina (IBUB) and Institut de Química Teòrica i Computacional (IQTCUB) , Universitat de Barcelona , Av. Joan XXIII 27-31 , 08028 Barcelona , Spain
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10
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Alonso JM, Quiroga S, Codony S, Turcu AL, Barniol-Xicota M, Pérez D, Guitián E, Vázquez S, Peña D. Palladium-catalyzed cocyclotrimerization of arynes with a pyramidalized alkene. Chem Commun (Camb) 2018; 54:5996-5999. [DOI: 10.1039/c8cc03188f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A pyramidalized alkene and diverse arynes are generated in the presence of a Pd-catalyst to afford [2+2+2] cocycloaddition products.
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Affiliation(s)
- José M. Alonso
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS)
- Departamento de Química Orgánica
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - Sabela Quiroga
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS)
- Departamento de Química Orgánica
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - Sandra Codony
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC)
- Facultat de Farmàcia i Ciències de l’Alimentació, and Institute of Biomedicine (IBUB)
- Universitat de Barcelona. Av. Joan XXIII, 27-31
- 08028 Barcelona
- Spain
| | - Andreea L. Turcu
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC)
- Facultat de Farmàcia i Ciències de l’Alimentació, and Institute of Biomedicine (IBUB)
- Universitat de Barcelona. Av. Joan XXIII, 27-31
- 08028 Barcelona
- Spain
| | - Marta Barniol-Xicota
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC)
- Facultat de Farmàcia i Ciències de l’Alimentació, and Institute of Biomedicine (IBUB)
- Universitat de Barcelona. Av. Joan XXIII, 27-31
- 08028 Barcelona
- Spain
| | - Dolores Pérez
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS)
- Departamento de Química Orgánica
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - Enrique Guitián
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS)
- Departamento de Química Orgánica
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
| | - Santiago Vázquez
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC)
- Facultat de Farmàcia i Ciències de l’Alimentació, and Institute of Biomedicine (IBUB)
- Universitat de Barcelona. Av. Joan XXIII, 27-31
- 08028 Barcelona
- Spain
| | - Diego Peña
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS)
- Departamento de Química Orgánica
- Universidade de Santiago de Compostela
- 15782 Santiago de Compostela
- Spain
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11
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Ishida S, Tamura T, Iwamoto T. Dearomative cycloadditions of a silylene with pyrazine and quinoxaline. Dalton Trans 2018; 47:11317-11321. [DOI: 10.1039/c8dt02802h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The dearomative cycloaddition of a dialkylsilylene with pyrazine affords an eight-membered heterocyclic compound with a trans-cycloalkene moiety.
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Affiliation(s)
- Shintaro Ishida
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Tomofumi Tamura
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Takeaki Iwamoto
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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12
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Masuda K, Tanigawa M, Nagatomo M, Urabe D, Inoue M. Construction of carbocycles initiated by Cu-catalyzed radical reaction of Cl2C(CN)2. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Camps P, Lozano D, Guitián E, Peña D, Pérez D, Font-Bardia M, Llamas-Saíz AL. Straightforward Synthesis of a Vicinal Double-Bridgehead Iodo Trimethylsilyl Octacycle: Unprecedented Lack of Reactivity of the Silyl Group in the Presence of Fluoride Anions. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601618] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Pelayo Camps
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC); Facultat de Farmàcia i Ciències de la Alimentació and Institut de Biomedicina (IBUB); Universitat de Barcelona; Av. Joan XXIII 27-31 08028 Barcelona Spain
| | - David Lozano
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC); Facultat de Farmàcia i Ciències de la Alimentació and Institut de Biomedicina (IBUB); Universitat de Barcelona; Av. Joan XXIII 27-31 08028 Barcelona Spain
| | - Enrique Guitián
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Diego Peña
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Dolores Pérez
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS) and Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Mercè Font-Bardia
- Departament de Cristal·lografia; Mineralogia I Dipòsits Minerals; Universitat de Barcelona; Martí Franquès s/n 08028 Barcelona Spain
- Unitat de Difracció de RX; Centres Científics I Tecnològics de la Universitat de Barcelona (CCiTUB); Solé i Sabarís 1-3 08028 Barcelona Spain
| | - Antonio L. Llamas-Saíz
- Unidade de Raios X. RIAIDT; Edificio CACTUS; Universidade de Santiago de Compostela; Campus Vida 15782 Santiago de Compostela Spain
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14
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Wang SC, Tantillo DJ. Viability of dodecahedrane-forming radical polycyclizations. Org Biomol Chem 2017; 15:1976-1979. [PMID: 27905615 DOI: 10.1039/c6ob02300b] [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
The results of density functional theory calculations on thiyl radical-promoted polycyclization to form dodecahedrane are described. On the basis of these results, the proposed polycyclization is predicted to be both highly exergonic and fast. These results showcase the potential power of radical polycyclization reactions in constructing complex molecular architectures.
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Affiliation(s)
- Selina C Wang
- University of California-Davis Olive Center, Davis, CA 95616, USA
| | - Dean J Tantillo
- Department of Chemistry, University of California-Davis, Davis, CA 95616, USA.
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15
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Bogdanov VP, Semivrazhskaya OO, Belov NM, Troyanov SI, Markov VY, Ioffe IN, Kemnitz E, Goryunkov AA. Stepwise Regioselective Hydrogenation ofcis-2-C60(CF2)2Homofullerene with [6,6]-Open/Closed Valence Tautomerism. Chemistry 2016; 22:15485-15490. [DOI: 10.1002/chem.201602351] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Viktor P. Bogdanov
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Olesya O. Semivrazhskaya
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Nikita M. Belov
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Sergey I. Troyanov
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Vitaliy Yu. Markov
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Ilya N. Ioffe
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Erhard Kemnitz
- Institute of Chemistry; Humboldt University Berlin; Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Alexey A. Goryunkov
- Chemistry Department; M. V. Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
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16
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Fujita Y, Abe M, Shiota Y, Suzuki T, Yoshizawa K. Computational Study of Cyclobutane-1,3-diylidene Dicarbenes: Ground-State Spin Multiplicity and New Strategy toward the Synthesis of Bicyclo[1.1.0]but-1(3)-enes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20160051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Santucci J, Sanzone JR, Woerpel KA. [4+2] Cycloadditions of Seven‐Membered‐Ring trans‐Alkenes: Decreasing Reactivity with Increasing Substitution of the Seven‐Membered Ring. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600329] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- John Santucci
- Department of ChemistryNew York University100 Washington Square East10003New YorkNYUSA
| | - Jillian R. Sanzone
- Department of ChemistryNew York University100 Washington Square East10003New YorkNYUSA
| | - K. A. Woerpel
- Department of ChemistryNew York University100 Washington Square East10003New YorkNYUSA
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18
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Camps P, Gómez T, Otermin A, Font-Bardia M, Estarellas C, Luque FJ. Short Access to Belt Compounds with Spatially Close C=C Bonds and Their Transannular Reactions. Chemistry 2015; 21:14036-46. [PMID: 26376331 DOI: 10.1002/chem.201502351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Indexed: 11/09/2022]
Abstract
Two domino Diels-Alder adducts were obtained from 3,7-bis(cyclopenta-2,4-dien-1-ylidene)-cis-bicyclo[3.3.0]octane and dimethyl acetylenedicarboxylate or N-methylmaleimide under microwave irradiation. From the first adduct, a C20H24 diene with C2v symmetry was obtained by Zn/AcOH reduction, hydrolysis, oxidative decarboxylation, and selective hydrogenation. Photochemical [2+2] cycloaddition of this diene gave a thermally unstable cyclobutane derivative, which reverts to the diene. However, both the diene and the cyclobutane derivatives could be identified by X-ray diffraction analysis upon irradiation of the diene crystal. New six-membered rings are formed upon the transannular addition of bromine or iodine to the diene. The N-type selectivity of the addition was examined by theoretical calculations, which revealed the distinct susceptibility of the doubly bonded carbon atoms to the bromine attack.
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Affiliation(s)
- Pelayo Camps
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia and Institut de Biomedicina (IBUB), Universitat de Barcelona, Av. Joan XXIII 27-31, 08028 Barcelona (Spain).
| | - Tània Gómez
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia and Institut de Biomedicina (IBUB), Universitat de Barcelona, Av. Joan XXIII 27-31, 08028 Barcelona (Spain)
| | - Ane Otermin
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia and Institut de Biomedicina (IBUB), Universitat de Barcelona, Av. Joan XXIII 27-31, 08028 Barcelona (Spain)
| | - Mercè Font-Bardia
- Departament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martí Franquès s/n. 08028 Barcelona (Spain) and Unitat de Difracció de RX, Centres Científics i Tecnològics de la Universitat de Barcelona (CCiTUB), Solé i Sabarís 1-3, 08028 Barcelona (Spain)
| | - Carolina Estarellas
- Departament de Fisicoquímica, Facultat de Farmàcia and Institut de Biomedicina (IBUB), Universitat de Barcelona, Prat de la Riba 171, 08921 Santa Coloma de Gramenet (Spain)
| | - Francisco Javier Luque
- Departament de Fisicoquímica, Facultat de Farmàcia and Institut de Biomedicina (IBUB), Universitat de Barcelona, Prat de la Riba 171, 08921 Santa Coloma de Gramenet (Spain)
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19
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Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Kekišev O, Kaljurand I, Toom L, Lenoir D, Burk P, Järv J. Effect of strain on gas-phase basicity of (E
)-1-methyl-2-(1-methyl-2-adamantylidene)adamantane. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3435] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Ott Kekišev
- Institute of Chemistry; University of Tartu; Ravila 14a 50411 Tartu Estonia
| | - Ivari Kaljurand
- Institute of Chemistry; University of Tartu; Ravila 14a 50411 Tartu Estonia
| | - Lauri Toom
- Institute of Technology; University of Tartu; Nooruse 1 50411 Tartu Estonia
| | - Dieter Lenoir
- Molecular Exposomics; Helmholtz Zentrum München; Ingolstädter Landstr. 1 85764 Neuherberg Germany
| | - Peeter Burk
- Institute of Chemistry; University of Tartu; Ravila 14a 50411 Tartu Estonia
| | - Jaak Järv
- Institute of Chemistry; University of Tartu; Ravila 14a 50411 Tartu Estonia
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21
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Kubli-Garfias C, Vázquez-Ramírez R, Cabrera-Vivas BM, Gómez-Reyes B, Ramírez JC. Atomic and molecular analysis highlights the biophysics of unprotonated and protonated retinal in UV and scotopic vision. Photochem Photobiol Sci 2015; 14:1660-72. [DOI: 10.1039/c5pp00091b] [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
Unprotonated (UR) and protonated (PR) retinal have marked atomic and molecular differences in cis and trans configurations. In conclusion, UR and PR uphold UV and light vision through their different biophysical properties.
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Affiliation(s)
- Carlos Kubli-Garfias
- Instituto de Investigaciones Biomédicas
- Universidad Nacional Autónoma de México
- México
- Mexico
| | | | | | | | - Juan Carlos Ramírez
- Facultad de Ciencias Químicas
- Benemérita Universidad Autónoma de Puebla
- Puebla 72530
- Mexico
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22
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Tsurusaki A, Kamiyama J, Kyushin S. Tetrasilane-Bridged Bicyclo[4.1.0]heptasil-1(6)-ene. J Am Chem Soc 2014; 136:12896-8. [DOI: 10.1021/ja507279z] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Akihiro Tsurusaki
- Division
of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
- Human
Resources Cultivation Center, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Jun Kamiyama
- Division
of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Soichiro Kyushin
- Division
of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
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23
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Agopcan Cinar S, Ercan S, Erol Gunal S, Dogan I, Aviyente V. The origin of exo-stereoselectivity of norbornene in hetero Diels–Alder reactions. Org Biomol Chem 2014; 12:8079-86. [DOI: 10.1039/c4ob01217h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Rey-Carrizo M, Barniol-Xicota M, Font-Bardia M, Vázquez S. Dimerization of Pyramidalized 3,4,8,9-Tetramethyltetracyclo [4.4.0.03,9.04,8]dec-1(6)-ene to a Hydrocarbon Featuring Four Cyclohexane Rings in Boat Conformations. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403985] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Rey-Carrizo M, Barniol-Xicota M, Font-Bardia M, Vázquez S. Dimerization of Pyramidalized 3,4,8,9-Tetramethyltetracyclo [4.4.0.03,9.04,8]dec-1(6)-ene to a Hydrocarbon Featuring Four Cyclohexane Rings in Boat Conformations. Angew Chem Int Ed Engl 2014; 53:8195-9. [DOI: 10.1002/anie.201403985] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Indexed: 11/10/2022]
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26
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Bos PH, Antalek MT, Porco JA, Stephenson CRJ. Tandem dienone photorearrangement-cycloaddition for the rapid generation of molecular complexity. J Am Chem Soc 2013; 135:17978-82. [PMID: 24161069 PMCID: PMC3964885 DOI: 10.1021/ja409992m] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
A tandem dienone photorearrangement-cycloaddition (DPC) reaction of novel cyclohexadienone substrates tethered with various 2π and 4π reaction partners resulted in the formation of polycyclic, bridged frameworks. In particular, use of alkynyl ether-tethered substrates led to (3 + 2) cycloaddition to afford strained alkenes which could be further elaborated by intra- and intermolecular cycloaddition chemistry to produce complex, polycyclic chemotypes.
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Affiliation(s)
- Pieter H. Bos
- Department of Chemistry, Center for Chemical Methodology and Library Development (CMLD-BU) Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Mitchell T. Antalek
- Department of Chemistry, Center for Chemical Methodology and Library Development (CMLD-BU) Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - John A. Porco
- Department of Chemistry, Center for Chemical Methodology and Library Development (CMLD-BU) Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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27
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Camps P, Gómez T, Budén ME, Otermin A, Calvet T, Font-Bardia M. Cross metathesis of several methylenecyclopentane derivatives. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.06.092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2013. [DOI: 10.1016/s0040-4020(13)01252-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Ioannou S, Krassos H, Nicolaides AV. Synthesis of a novel diene from a cyclobutane precursor: an entry to 2,9-disubstituted [2]diadamantanes. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.06.102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Ioannou S, Moushi E. Tri-cyclo-[3.3.1.0(3,7)]nonane-3,7-diyl bis-(4-methyl-benzene-sulfonate). Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1464-5. [PMID: 24427087 PMCID: PMC3884498 DOI: 10.1107/s1600536813023234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2013] [Accepted: 08/19/2013] [Indexed: 11/10/2022]
Abstract
The title compound, C23H26O6S2 was synthesized by esterification of tri-cyclo-[3.3.1.0(3,7)]nonane-3,7-diol with p-toluene-sulfonyl chloride. The mol-ecule has symmetry 2 and is situated on site 4e. The C-C bond length between the quartenary C atoms is 1.598 (2) Å, which is considerably longer than other C-C bonds in the mol-ecule. There are C-H⋯O inter-actions present in the structure. As a consequence, the packing of the molecule (viewed along [100]) appears as chains where the molecules run parallel, but each chain has the opposite direction to the neighboring ones.
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Affiliation(s)
- Savvas Ioannou
- Chemistry Department, University of Cyprus, Nicosia, 1678, Cyprus,Correspondence e-mail:
| | - Eleni Moushi
- Chemistry Department, University of Cyprus, Nicosia, 1678, Cyprus
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31
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Affiliation(s)
- Michal Szostak
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
| | - Jeffrey Aubé
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
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32
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Firme CL, da Costa TF, da Penha ET, Esteves PM. Electronic structures of bisnoradamantenyl and bisnoradamantanyl dications and related species. J Mol Model 2013; 19:2485-97. [DOI: 10.1007/s00894-013-1785-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Accepted: 01/28/2013] [Indexed: 10/27/2022]
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33
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Lopez SA, Munk ME, Houk KN. Mechanisms and transition states of 1,3-dipolar cycloadditions of phenyl azide with enamines: a computational analysis. J Org Chem 2013; 78:1576-82. [PMID: 23347077 DOI: 10.1021/jo302695n] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The transition structures for the 1,3-dipolar cycloadditions of phenyl azide to enamines derived from acetophenone or phenylacetaldehyde and piperidine, morpholine, or pyrrolidine were located using quantum mechanical methods. These cycloadditions were studied experimentally in 1975 by Meilahn, Cox, and Munk (J. Org. Chem. 1975, 40, 819-823). Calculations were carried out with M06-2X/6-311+G(d,p), SCS-MP2/6-311+G(d,p)//M06-2X/6-311+G(d,p), and B97D/6-311+G(d,p) methods with the IEF-PCM solvation model for chloroform and ethanol. The distortion/interaction model was utilized to understand mechanisms, reactivities, and selectivities.
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Affiliation(s)
- Steven A Lopez
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, USA
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34
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Ioannou S, Moushi E. 2,9-Diiodo-hexa-cyclo-[9.3.1.1(2,6).1(4,8).1(9,13).0(1,8)]octa-deca-ne. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o2340-1. [PMID: 22904809 PMCID: PMC3414276 DOI: 10.1107/s1600536812026797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2012] [Accepted: 06/13/2012] [Indexed: 11/10/2022]
Abstract
The title compound, C18H24I2, has an adamantanoid structure with tetrahedral cages having four C atoms lying on the same plane [(I—)C—C—C—C(—I) torsion angle = 0°]. The plane is extended by the two I atoms, each having a deviation of 1.0 (6) Å [C—C—C—I torsion angle = 178.9 (4)°]. The central C—C bond connecting the two quaternary carbons seems enlarged [1.593 (9) Å] in comparison to the corresponding bond in [2]diadamantane [1.554 (3) Å]. This is attributed to the presence of the electronegative I atoms, which affect inductively the C atoms of the four-C-atom plane, making the central C—C bond weaker.
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Affiliation(s)
- Savvas Ioannou
- Chemistry Department, University of Cyprus, Nicosia 1678, Cyprus
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35
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Lopez SA, Houk KN. Alkene Distortion Energies and Torsional Effects Control Reactivities, and Stereoselectivities of Azide Cycloadditions to Norbornene and Substituted Norbornenes. J Org Chem 2012; 78:1778-83. [DOI: 10.1021/jo301267b] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Steven A. Lopez
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569,
United States
| | - K. N. Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569,
United States
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36
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Gavrish SP. Approximate expressions and the relationship between pyramidalization (out-of-plane deformation) characteristics of trigonal centers. J Comput Chem 2012; 33:2173-9. [DOI: 10.1002/jcc.23053] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 04/28/2012] [Accepted: 05/30/2012] [Indexed: 11/06/2022]
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37
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Unexpected tautomeric equilibria of the carbanion-enamine intermediate in pyruvate oxidase highlight unrecognized chemical versatility of thiamin. Proc Natl Acad Sci U S A 2012; 109:10867-72. [PMID: 22730460 DOI: 10.1073/pnas.1201280109] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Thiamin diphosphate, the vitamin B1 coenzyme, plays critical roles in fundamental metabolic pathways that require acyl carbanion equivalents. Studies on chemical models and enzymes had suggested that these carbanions are resonance-stabilized as enamines. A crystal structure of this intermediate in pyruvate oxidase at 1.1 Å resolution now challenges this paradigm by revealing that the enamine does not accumulate. Instead, the intermediate samples between the ketone and the carbanion both interlocked in a tautomeric equilibrium. Formation of the keto tautomer is associated with a loss of aromaticity of the cofactor. The alternate confinement of electrons to neighboring atoms rather than π-conjugation seems to be of importance for the enzyme-catalyzed, redox-coupled acyl transfer to phosphate, which requires a dramatic inversion of polarity of the reacting substrate carbon in two subsequent catalytic steps. The ability to oscillate between a nucleophilic (carbanion) and an electrophilic (ketone) substrate center highlights a hitherto unrecognized versatility of the thiamin cofactor. It remains to be studied whether formation of the keto tautomer is a general feature of all thiamin enzymes, as it could provide for stable storage of the carbanion state, or whether this feature represents a specific trait of thiamin oxidases. In addition, the protonation state of the two-electron reduced flavin cofactor can be fully assigned, demonstrating the power of high-resolution cryocrystallography for elucidation of enzymatic mechanisms.
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38
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2011. [DOI: 10.1016/s0040-4020(11)00770-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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39
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Stoltz B, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2010. [DOI: 10.1016/s0040-4020(10)01735-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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Navickas V, Ushakov DB, Maier ME, Ströbele M, Meyer HJ. Synthesis of the Guaianolide Ring System via Cycloaddition of a Bicyclic Carbonyl Ylide with Allyl Propiolate. Org Lett 2010; 12:3418-21. [DOI: 10.1021/ol1012185] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vaidotas Navickas
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, and Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen
| | - Dmitry B. Ushakov
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, and Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen
| | - Martin E. Maier
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, and Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen
| | - Markus Ströbele
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, and Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen
| | - H.-Jürgen Meyer
- Institut für Organische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, and Abteilung für Festkörperchemie und Theoretische Anorganische Chemie, Institut für Anorganische Chemie, Universität Tübingen, Ob dem Himmelreich 7, 72074 Tübingen
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Kolakowski RV, Williams LJ. Stereoinduction by distortional asymmetry. Nat Chem 2010; 2:303-7. [PMID: 21124512 DOI: 10.1038/nchem.577] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2009] [Accepted: 01/19/2010] [Indexed: 11/09/2022]
Abstract
Stereoselective chemical synthesis requires the two faces of a π bond to be differentiated. Theoretically sound qualitative models for understanding stereoinduction seem to break down in sterically unbiased cyclic systems. Presented here as the distortional asymmetry model is new insight that identifies circumstances where distortional ground state contributions are highly asymmetric and thereby contribute significantly to face selectivity. Out-of-plane distortional potential calculations, transition state calculations and molecular orbital analysis agree with experimental data that cannot otherwise be attributed to steric, torsion, polar or emergent transition state stabilizing effects. The model is readily understood in terms of reaction theory. The explanatory power of the model is also discussed.
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Affiliation(s)
- Robert V Kolakowski
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08903, USA
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42
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Ioannou S, Nicolaides AV, Manos MJ. Tricyclo[3.3.1.0 3,7]nonane-3,7-diyl bis(methanesulfonate). Acta Crystallogr Sect E Struct Rep Online 2010; 66:o409. [PMID: 21579828 PMCID: PMC2979816 DOI: 10.1107/s1600536810001261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Accepted: 01/11/2010] [Indexed: 11/30/2022]
Abstract
The crystal structure of the title compound, C11H18O6S2, was determined to investigate the effect of the eclipsed mesyl groups on the bond length of the vicinal quaternary C atoms. The two quaternary C atoms of the noradamantane skeleton and the two O atoms to which they are connected all located essentially in the same plane [maximum deviation 0.01 Å], resulting in an eclipsing conformation of the C—O bonds. The C—C bond of the quaternary C atoms is 1.597 (3) Å is considerably longer than the other C—C bonds of the molecule.
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43
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DFT and MP2 study on the electrophilic addition reaction of bromine to exo-tricyclo[3.2.1.0(2.4)]oct-6-ene. J Mol Model 2009; 16:781-8. [PMID: 19904565 DOI: 10.1007/s00894-009-0608-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 09/28/2009] [Indexed: 10/20/2022]
Abstract
The geometry and electronic structure of exo-tricyclo[3.2.1.0(2,4)]oct-6-ene (exo-TCO) was investigated using DFT methods. The two faces of the endo-pyramidalised double bond of the molecule are not equivalent. The exo face of the double bond has regions with high electron density (q (i,HOMO)) and greater negative potential. Molecular complexes of exo-TCO with bromine were investigated using the B3LYP/6-311++G(d,p) method; the exo-TCO . . . Br(2)(exo) molecular complex was found to be relatively more stable than the exo-TCO . . . Br(2)(endo) complex. The cationic intermediates of the reaction were studied by DFT and MP2 methods. The solvent effect was evaluated using the self-consistent isodensity polarised continuum model (SCI-PCM). The exo-bromonium cation was found to be more stable than the endo-bromonium cation. Exo-facial selectivity due to electronic and steric factors was observed upon addition of bromine to exo-TCO. The multicentre nonclassical delocalised bromocarbonium cation IV and the exo-bridged-bromonium cation I are more stable than the rearrangement cation V. The reaction products are formed via exo-bridged-bromonium I and nonclassical IV cations, which are the most stable intermediates and whose stabilities barely differ. The mechanism of the addition reaction is also discussed.
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45
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Pillekamp M, Alachraf W, Oppel IM, Dyker G. Cage Hydrocarbons Derived from Dibenzosuberenone. J Org Chem 2009; 74:8355-8. [DOI: 10.1021/jo9018057] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcus Pillekamp
- Faculty for Chemistry & Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - Wasim Alachraf
- Faculty for Chemistry & Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - Iris M. Oppel
- Faculty for Chemistry & Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
| | - Gerald Dyker
- Faculty for Chemistry & Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, D-44780 Bochum, Germany
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46
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Glasovac Z, Antol I, Vazdar M, Margetić D. Zwitterionic structures of strained cis-pyramidalized disilenes: fact or artifact. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0633-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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47
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Camps P, Fernández JA, Rull J, Vázquez S. Double Methylenecyclopentane Annulation of Succinimides: Easy Access to 3,7-Dioxobicyclo[3.3.0]octane-1,5-dicarboximides. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900273] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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48
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Miluykov V, Bezkishko I, Zagidullin A, Sinyashin O, Lönnecke P, Hey-Hawkins E. Cycloaddition Reactions of 1-Alkyl-3,4,5-triphenyl-1,2-diphosphacyclopenta-2,4-dienes. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801181] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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49
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50
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Electron affinities of a homologous series of tertiary alkyl radicals and their C–H bond dissociation energies (BDEs). Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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