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Ríos P, Fouilloux H, Díez J, Vidossich P, Lledós A, Conejero S. σ-Silane Platinum(II) Complexes as Intermediates in C-Si Bond-Coupling Processes. Chemistry 2019; 25:11346-11355. [PMID: 31246316 DOI: 10.1002/chem.201902226] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 06/26/2019] [Indexed: 12/15/2022]
Abstract
Platinum complexes [Pt(NHC')(NHC)][BArF ] (in which NHC' denotes a cyclometalated N-heterocyclic carbene ligand, NHC) react with primary silanes RSiH3 to afford the cyclometalated platinum(II) silyl complexes [Pt(NHC-SiHR')(NHC)][BArF ] through a process that involves the formation of C-Si and Pt-Si bonds with concomitant extrusion of H2 . Low-temperature NMR studies indicate that the process proceeds through initial formation of the σ-SiH complexes [Pt(NHC')(NHC)(HSiH2 R)][BArF ], which are stable at temperatures below -10 °C. At higher temperatures, activation of one Si-H bond followed by a C-Si coupling reaction generates an agostic SiH platinum hydride derivative [Pt(H)(NHC'-SiH2 R)(NHC)][BArF ], which undergoes a second Si-H bond activation to afford the final products. Computational modeling of the reaction mechanism indicates that the stereochemistry of the silyl/hydride ligands after the first Si-H bond cleavage dictates the nature of the products, favoring the formation of a C-Si bond over a C-H bond, in contrast to previous results obtained for tertiary silanes. Furthermore, the process involves a trans-to-cis isomerization of the NHC ligand before the second Si-H bond cleavage.
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Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química, Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINCA), CSIC and Universidad de Sevilla, C/ Américo Vespucio 49, 41092, Sevilla, Spain
| | - Hugo Fouilloux
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química, Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINCA), CSIC and Universidad de Sevilla, C/ Américo Vespucio 49, 41092, Sevilla, Spain
| | - Josefina Díez
- Laboratorio de Compuestos Organometálicos y Catálisis (Unidad asociada al CSIC), Departamento de Química Orgánica e Inorgánica, Universidad de Oviedo, C/ Julián Clavería 8, 33008, Oviedo, Spain
| | - Pietro Vidossich
- Departament de Química, Centro de Innovación en Química Avanzada (ORFEO-CINCA), Universitat Autònoma de Barcelona, Campus UAB, 08193, Cerdanyola del Vallès, Spain.,COBO Computational Bio-Organic Chemistry Bogotá, Department of Chemistry, Universidad de los Andes, Carrera 1 #18A-12, 111711, Bogotá, Colombia
| | - Agustí Lledós
- Departament de Química, Centro de Innovación en Química Avanzada (ORFEO-CINCA), Universitat Autònoma de Barcelona, Campus UAB, 08193, Cerdanyola del Vallès, Spain
| | - Salvador Conejero
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química, Inorgánica, Centro de Innovación en Química Avanzada (ORFEO-CINCA), CSIC and Universidad de Sevilla, C/ Américo Vespucio 49, 41092, Sevilla, Spain
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Hao W, Geng W, Zhang WX, Xi Z. Palladium-Catalyzed One-Pot Three- or Four-Component Coupling of Aryl Iodides, Alkynes, and Amines through CN Bond Cleavage: Efficient Synthesis of Indole Derivatives. Chemistry 2014; 20:2605-12. [DOI: 10.1002/chem.201304215] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Indexed: 01/01/2023]
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Mo Z, Liu Y, Deng L. Anchoring of silyl donors on a N-heterocyclic carbene through the cobalt-mediated silylation of benzylic C-H bonds. Angew Chem Int Ed Engl 2013; 52:10845-9. [PMID: 23959570 DOI: 10.1002/anie.201304596] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 07/21/2013] [Indexed: 01/22/2023]
Affiliation(s)
- Zhenbo Mo
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032 (P. R. China) http://dengliang.sioc.ac.cn/
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Mo Z, Liu Y, Deng L. Anchoring of Silyl Donors on a N-Heterocyclic Carbene through the Cobalt-Mediated Silylation of Benzylic CH Bonds. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304596] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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