1
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Kim J, Egger DT, Frye CW, Beaumier EP, Tonks IA. Cp 2Ti(II) Mediated Rearrangement of Cyclopropyl Imines. Organometallics 2023; 42:1331-1338. [PMID: 37915831 PMCID: PMC10619969 DOI: 10.1021/acs.organomet.3c00032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
Ti-catalyzed oxidative alkyne carboamination with alkenes and azo compounds can yield either α,β-unsaturated imines or cyclopropyl imines through a common azatitanacyclohexene intermediate. Herein, we report the synthesis of a model azatitanacyclohexene complex (3) through the ring-opening of a cyclopropyl imine with Cp2Ti(BTMSA) (BTMSA = bis(trimethylsilyl)acetylene). 3 readily undergoes thermal or reductant-catalyzed ring contraction to an azatitanacyclopentene (4), analogous to the proposed mechanism for forming α,β-unsaturated imines in the catalytic reaction. A cyclopropyl imine or an α,β-unsaturated imine could be liberated via the oxidation of 3 or 4 with azobenzene, respectively, further implicating the role of these metallacycles in the Ti-catalyzed carboamination reaction.
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Affiliation(s)
- Jaekwan Kim
- Department of Chemistry, University of Minnesota–Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Dominic T. Egger
- Department of Chemistry, University of Minnesota–Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Connor W. Frye
- Department of Chemistry, University of Minnesota–Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Evan P. Beaumier
- Department of Chemistry, University of Minnesota–Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Ian A. Tonks
- Department of Chemistry, University of Minnesota–Twin Cities, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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2
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Fischer M, Manßen M, Schmidtmann M, Klüner T, Beckhaus R. Selective propargylic C(sp 3)-H activation of methyl-substituted alkynes versus [2 + 2] cycloaddition at a titanium imido template. Chem Sci 2021; 12:13711-13718. [PMID: 34760155 PMCID: PMC8549805 DOI: 10.1039/d1sc04334j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 09/27/2021] [Indexed: 11/29/2022] Open
Abstract
The reaction of the titanium imido complex 1b with 2-butyne leads to the formation of the titanium azadiene complex 2a at ambient temperature instead of yielding the archetypical [2 + 2] cycloaddition product (titanaazacyclobutene) which is usually obtained by combining titanium imido complexes and internal alkynes. The formation of 2a is presumably caused by an initial propargylic C(sp3)–H activation step and quantum chemical calculations suggest that the outcome of this unexpected reactivity is thermodynamically favored. The previously reported titanaazacyclobutene I (which is obtained by reacting 1b with 1-phenyl-1-propyne) undergoes a rearrangement reaction at elevated temperature to give the corresponding five-membered titanium azadiene complex 2b. An unexpected reactivity between a titanium imido complex and internal alkynes was unveiled yielding titanaazacyclobutenes instead of the expected [2 + 2] cycloaddition products.![]()
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Affiliation(s)
- Malte Fischer
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road Oxford OX1 3QR UK .,Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Manfred Manßen
- Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 D-72076 Tübingen Germany .,Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Thorsten Klüner
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
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3
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Carbó JJ, Gómez-Pantoja M, Martín A, Mena M, Ricart JM, Salom-Català A, Santamaría C. A Bridging bis-Allyl Titanium Complex: Mechanistic Insights into the Electronic Structure and Reactivity. Inorg Chem 2019; 58:12157-12166. [DOI: 10.1021/acs.inorgchem.9b01505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jorge J. Carbó
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Campus Sescelades, C/Marcel.lí Domingo, s/n, 43007 Tarragona, Spain
| | - María Gómez-Pantoja
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, E-28805 Alcalá de Henares, Madrid, Spain
| | - Avelino Martín
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, E-28805 Alcalá de Henares, Madrid, Spain
| | - Miguel Mena
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, E-28805 Alcalá de Henares, Madrid, Spain
| | - Josep M. Ricart
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Campus Sescelades, C/Marcel.lí Domingo, s/n, 43007 Tarragona, Spain
| | - Antoni Salom-Català
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Campus Sescelades, C/Marcel.lí Domingo, s/n, 43007 Tarragona, Spain
| | - Cristina Santamaría
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, Campus Universitario, E-28805 Alcalá de Henares, Madrid, Spain
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4
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Manßen M, de Graaff S, Meyer MF, Schmidtmann M, Beckhaus R. Direct Access to Titanocene Imides via Bis(η5:η1-penta-fulvene)titanium Complexes and Primary Amines. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00264] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Manfred Manßen
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Simon de Graaff
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - May-Franzis Meyer
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Marc Schmidtmann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
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5
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Manßen M, Weimer I, Adler C, Fischer M, Schmidtmann M, Beckhaus R. From Organic Azides through Titanium Triazenido Complexes to Titanium Imides. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701273] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Manfred Manßen
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
| | - Irina Weimer
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
| | - Christian Adler
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
| | - Malte Fischer
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
| | - Rüdiger Beckhaus
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; Postfach 2503 26111 Oldenburg Germany
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6
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Carbó JJ, García-López D, Gómez-Pantoja M, González-Pérez JI, Martín A, Mena M, Santamaría C. Intermetallic Cooperation in C–H Activation Involving Transient Titanium-Alkylidene Species: A Synthetic and Mechanistic Study. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00416] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jorge J. Carbó
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, Campus Sescelades, C/Marcel.lí Domingo, s/n, 43007 Tarragona, Spain
| | - Diego García-López
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, Campus Sescelades, C/Marcel.lí Domingo, s/n, 43007 Tarragona, Spain
| | - María Gómez-Pantoja
- Departamento
de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, Alcalá
de Henares, Madrid 28805, Spain
| | - Juan I. González-Pérez
- Departamento
de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, Alcalá
de Henares, Madrid 28805, Spain
| | - Avelino Martín
- Departamento
de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, Alcalá
de Henares, Madrid 28805, Spain
| | - Miguel Mena
- Departamento
de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, Alcalá
de Henares, Madrid 28805, Spain
| | - Cristina Santamaría
- Departamento
de Química Orgánica y Química Inorgánica, Universidad de Alcalá, Campus Universitario, Alcalá
de Henares, Madrid 28805, Spain
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