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Verspeek D, Ahrens S, Wen X, Yang Y, Li YW, Junge K, Beller M. A manganese-based catalyst system for general oxidation of unactivated olefins, alkanes, and alcohols. Org Biomol Chem 2024; 22:2630-2642. [PMID: 38456330 DOI: 10.1039/d4ob00155a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2024]
Abstract
Non-noble metal-based catalyst systems consisting of inexpensive manganese salts, picolinic acid and various heterocycles enable epoxidation of the challenging (terminal) unactivated olefins, selective C-H oxidation of unactivated alkanes, and O-H oxidation of secondary alcohols with aqueous hydrogen peroxide. In the presence of the in situ generated optimal manganese catalyst, epoxides are generated with up to 81% yield from alkenes and ketone products with up to 51% yield from unactivated alkanes. This convenient protocol allows the formation of the desired products under ambient conditions (room temperature, 1 bar) by employing only a slight excess of hydrogen peroxide with 2,3-butadione as a sub-stoichiometric additive.
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Affiliation(s)
- Dennis Verspeek
- Leibniz-Institute für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Sebastian Ahrens
- Leibniz-Institute für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Xiandong Wen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd, Huairou District, Beijing, 101400, China
| | - Yong Yang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd, Huairou District, Beijing, 101400, China
| | - Yong-Wang Li
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China
- National Energy Center for Coal to Liquids, Synfuels China Co., Ltd, Huairou District, Beijing, 101400, China
| | - Kathrin Junge
- Leibniz-Institute für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Matthias Beller
- Leibniz-Institute für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
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Verspeek D, Ahrens S, Spannenberg A, Wen X, Yang Y, Li Y, Junge K, Beller M. Manganese N,N,N-Pincer Complex-catalyzed Epoxidation of Unactivated Aliphatic Olefins. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01472f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical in situ generated manganese(II) catalyst system with the commercially available bis(2-picolyl) amine ligand enables epoxidation of terminal aliphatic olefins in good yields with tert-butyl hydroperoxide as oxidant. Crystallization...
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Abstract
The photolysis of diazoalkanes is a timely strategy to conduct carbene-transfer reactions under mild and metal-free reaction conditions, and has developed as an important alternative to conventional metal-catalyzed carbene-transfer reactions. One of the major limitations lies within the rapidly occurring side reaction of the carbene intermediate with remaining diazoalkane molecules that result in the use of an excess of the reaction partner and thus impacts on the reaction efficiency. Herein, we describe a protocol that takes advantage of the in situ generation of donor-acceptor diazoalkanes by Bamford-Stevens reaction. Following this strategy, the concentration of the diazoalkane reaction partner can be minimized to reduce unwanted side reactions and to now conduct photochemical carbene transfer reactions under stoichiometric reaction conditions. We have explored this approach in the C-H and N-H functionalization and cyclopropanation reaction of N-heterocycles and could demonstrate the applicability of this method in 51 examples.
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Affiliation(s)
- Sripati Jana
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
| | - Fang Li
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
| | - Claire Empel
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
| | - Dennis Verspeek
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
| | - Polina Aseeva
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
| | - Rene M. Koenigs
- RWTH Aachen UniversityInstitute of Organic ChemistryLandoltweg 152074AachenGermany
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