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Masaro C, Meloni G, Baron M, Graiff C, Tubaro C, Royo B. Bis(N-Heterocyclic Carbene) Manganese(I) Complexes in Catalytic N-Formylation/N-Methylation of Amines Using Carbon Dioxide and Phenylsilane. Chemistry 2023; 29:e202302273. [PMID: 37695746 DOI: 10.1002/chem.202302273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/08/2023] [Accepted: 09/10/2023] [Indexed: 09/13/2023]
Abstract
A series of six Mn(I) complexes with general formula [MnBr(bisNHC)(CO)3 ], having a bidentate bis(N-heterocyclic carbene) ligand (bisNHC), has been developed by varying the bridging group between the NHC donors, the nitrogen wingtip substituents and the heterocyclic ring. The synthesis of the complexes has been accomplished by in situ transmetalation of the bisNHC from the corresponding silver(I) complexes. Removal of the bromide anion affords the corresponding solvento complexes [Mn(bisNHC)(CO)3 (CH3 CN)](BF4 ). The influence of the bisNHC structure on its electron donor ability has been evaluated by FTIR and 13 C NMR spectroscopy, both in the neutral and cationic complexes. Finally, the isolated Mn(I)-bisNHC complexes have been employed as homogeneous catalysts in the reductive N-formylation and N-methylation of amines with CO2 as C1 source and phenylsilane as reducing agent, showing a high selectivity for the N-methylated product. Preliminary mechanistic investigations suggest that, in the adopted reaction conditions, the formylated product can be formed via different reaction pathways, either metal-catalyzed or not, while the methylation reaction requires the use of the Mn(I) catalyst.
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Affiliation(s)
- Chiara Masaro
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131, Padova, Italy
- ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República, 2780-157, Oeiras, Portugal
| | - Giammarco Meloni
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131, Padova, Italy
- CIRCC-Consorzio Interuniversitario per le reattività chimiche e la catalisi, Unità di Padova, Università degli Studi di Padova, Padova, Italy
| | - Marco Baron
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131, Padova, Italy
- CIRCC-Consorzio Interuniversitario per le reattività chimiche e la catalisi, Unità di Padova, Università degli Studi di Padova, Padova, Italy
| | - Claudia Graiff
- Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università degli Studi di Parma, Parco Area delle Scienze 17/A, 43124, Parma, Italy
| | - Cristina Tubaro
- Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131, Padova, Italy
- CIRCC-Consorzio Interuniversitario per le reattività chimiche e la catalisi, Unità di Padova, Università degli Studi di Padova, Padova, Italy
| | - Beatriz Royo
- ITQB NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República, 2780-157, Oeiras, Portugal
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Iridium-catalyzed reductive amination of carboxylic acids. J Catal 2023. [DOI: 10.1016/j.jcat.2023.01.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Ran Z, Liu J, Mushtaq MA, Shao X, Liu H, Du X, Hou S, Ji S. Preparation of magnetic Au/MIL-101(Cr)@SiO2@Fe3O4 catalysts and N-methylation reaction mechanism of CO2 with aniline/H2. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.04.017] [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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