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Affiliation(s)
- Rodrigo García-Loma
- IU CINQUIMA/Química Inorgánica; Universidad de Valladolid; 47011 Valladolid Spain
| | - Ana C. Albéniz
- IU CINQUIMA/Química Inorgánica; Universidad de Valladolid; 47011 Valladolid Spain
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2
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Molina de la Torre JA, Pérez-Ortega I, Beltrán Á, Rodríguez MR, Díaz-Requejo MM, Pérez PJ, Albéniz AC. Trispyrazolylborate Ligands Supported on Vinyl Addition Polynorbornenes and Their Copper Derivatives as Recyclable Catalysts. Chemistry 2019; 25:556-563. [PMID: 30194871 DOI: 10.1002/chem.201803852] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Indexed: 11/05/2022]
Abstract
Polynorbornenes prepared by vinyl addition polymerization and bearing pendant alkenyl groups serve as skeletons to support trispyrazolylborate ligands (Tpx ) built at those alkenyl sites. Reaction with CuI in acetonitrile led to VA-PNB-Tpx Cu(NCMe) (VA-PBN=vinyl addition polynorbornene) with a 0.8-1.4 mmol incorporation of Cu per gram of polymer. The presence of tetracoordinated copper(I) ions was been assessed by FTIR studies on the corresponding VA-PNB-Tpx Cu(CO) adducts, in agreement with those on discrete Tpx Cu(CO). The new materials were employed as heterogeneous catalysts in several carbene- and nitrene-transfer reactions, showing a behavior similar to that of the homogeneous counterparts but also being recycled several times maintaining a high degree of activity and selectivity. This is the first example of supported Tpx ligands onto polymeric supports with catalytic applications.
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Affiliation(s)
| | - Ignacio Pérez-Ortega
- IU CINQUIMA/Química Inorgánica, Universidad de Valladolid, 47071, Valladolid, Spain
| | - Álvaro Beltrán
- Laboratorio de Catálisis Homogénea, Unidad Asociada al, CSIC CIQSO-Centro de Investigación en Química Sostenible, Departamento de Química, Universidad de Huelva, 21007-, Huelva, Spain
| | - Manuel R Rodríguez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al, CSIC CIQSO-Centro de Investigación en Química Sostenible, Departamento de Química, Universidad de Huelva, 21007-, Huelva, Spain
| | - M Mar Díaz-Requejo
- Laboratorio de Catálisis Homogénea, Unidad Asociada al, CSIC CIQSO-Centro de Investigación en Química Sostenible, Departamento de Química, Universidad de Huelva, 21007-, Huelva, Spain
| | - Pedro J Pérez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al, CSIC CIQSO-Centro de Investigación en Química Sostenible, Departamento de Química, Universidad de Huelva, 21007-, Huelva, Spain
| | - Ana C Albéniz
- IU CINQUIMA/Química Inorgánica, Universidad de Valladolid, 47071, Valladolid, Spain
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3
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Coussanes G, Jakobi H, Lindell S, Bonjoch J. Synthesis of α-Chlorolactams by Cyanoborohydride-Mediated Radical Cyclization of Trichloroacetamides. Chemistry 2018; 24:8151-8156. [PMID: 29603478 DOI: 10.1002/chem.201800210] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Indexed: 12/30/2022]
Abstract
A cyanoborohydride-promoted radical cyclization methodology has been developed to access α-chlorolactams in a simple and efficient way using NaBH3 CN and trichloroacetamides easily available from allylic and homoallylic secondary amines. This methodology allowed the synthesis of a library of α-chlorolactams (mono- and bicyclic), which were tested for herbicidal activity, trans-3-chloro-4-methyl-1-(3-trifluoromethyl)phenyl-2-pyrrolidinone being the most active.
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Affiliation(s)
- Guilhem Coussanes
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona, Av. Joan XXIII s/n, 08028, Barcelona, Spain
| | - Harald Jakobi
- Bayer AG, Crop Science Division, Industriepark Höchst G836, 65926, Frankfurt am Main, Germany
| | - Stephen Lindell
- Bayer AG, Crop Science Division, Industriepark Höchst G836, 65926, Frankfurt am Main, Germany
| | - Josep Bonjoch
- Laboratori de Química Orgànica, Facultat de Farmàcia, IBUB, Universitat de Barcelona, Av. Joan XXIII s/n, 08028, Barcelona, Spain
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