1
|
Dey K, de Ruiter G. Chemoselective Hydrogenation of α,β-Unsaturated Ketones Catalyzed by a Manganese(I) Hydride Complex. Org Lett 2024; 26:4173-4177. [PMID: 38738936 PMCID: PMC11129310 DOI: 10.1021/acs.orglett.4c00277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2024] [Revised: 04/21/2024] [Accepted: 05/07/2024] [Indexed: 05/14/2024]
Abstract
Here, we report the chemoselective hydrogenation of α,β-unsaturated ketones catalyzed by a well-defined Mn(I) PCNHCP pincer complex [(PCNHCP)Mn(CO)2H] (1). The reaction is compatible with a wide variety of functional groups that include halides, esters, amides, nitriles, nitro, alkynes, and alkenes, and for most substrates occurs readily at ambient hydrogen pressure (1-2 bar). Mechanistic studies and deuterium labeling experiments reveal a non-cooperative mechanism, which is further discussed in this report.
Collapse
Affiliation(s)
- Kartick Dey
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
| | - Graham de Ruiter
- Schulich
Faculty of Chemistry, Technion −
Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
| |
Collapse
|
2
|
Beaufils A, Melle P, Lentz N, Albrecht M. Air-Stable Coordinatively Unsaturated Ruthenium(II) Complex for Ligand Binding and Catalytic Transfer Hydrogenation of Ketones from Ethanol. Inorg Chem 2024; 63:2072-2081. [PMID: 38230574 DOI: 10.1021/acs.inorgchem.3c03859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Coordinatively unsaturated complexes are interesting from a fundamental level for their formally empty coordination site and, in particular, from a catalytic perspective as they provide opportunities for substrate binding and transformation. Here, we describe the synthesis of a novel underligated ruthenium complex [Ru(cym)(N,N')]+, 3, featuring an amide-functionalized pyridylidene amide (PYA) as the N,N'-bidentate coordinating ligand. In contrast to previously investigated underligated complexes, complex 3 offers potential for dynamic modifications, thanks to the flexible donor properties of the PYA ligand. Specifically, they allow both for stabilizing the formally underligated metal center in complex 3 through nitrogen π-donation and for facilitating through π-acidic bonding properties the coordination of a further ligand L to the ruthenium center to yield the formal 18 e- complexes [Ru(cym)(N,N')(L)]+ (4: L = P(OMe)3; 5: L = PPh3; 6: L = N-methylimidazole; 7: L = pyridine) and neutral complex [RuCl(cym)(N,N')] 8. Analysis by 1H NMR and UV-vis spectroscopies reveals an increasing Ru-L bond strength along the sequence pyridine <1-methylimidazole < PPh3 < P(OMe)3 with binding constants varying over 3 orders of magnitude with log(Keq) values between 2.8 and 5.7. The flexibility of the Ru(PYA) unit and the ensuing accessibility of saturated and unsaturated species with one and the same ligand are attractive from a fundamental point of view and also for catalytic applications, as catalytic transformations rely on the availability of transiently vacant coordination sites. Thus, while complex 3 does not form stable adducts with O-donors such as ketones or alcohols, it transiently binds these species, as evidenced by the considerable catalytic activity in the transfer hydrogenation of ketones. Notably, and as one of only a few catalysts, complex 3 is compatible with EtOH as a hydrogen source. Complex 3 shows excellent performance in the transfer hydrogenation of pyridyl-containing substrates, in agreement with the poor coordination strength of this functional group to the ruthenium center in 3.
Collapse
Affiliation(s)
- Alicia Beaufils
- Department of Chemistry, Biochemistry, and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
| | - Philipp Melle
- Department of Chemistry, Biochemistry, and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
| | - Nicolas Lentz
- Department of Chemistry, Biochemistry, and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
| | - Martin Albrecht
- Department of Chemistry, Biochemistry, and Pharmaceutical Sciences, University of Bern, Freiestrasse 3, Bern 3012, Switzerland
| |
Collapse
|
3
|
Mandal A, Ganguli K, Pradhan M, Gorai A, Kundu S. Selective Transfer Hydrogenation of C=O and Conjugated C=C Bonds Using An NHC-Based Pincer (CNC)Mn I Complex in Methanol. CHEMSUSCHEM 2023; 16:e202300683. [PMID: 37287441 DOI: 10.1002/cssc.202300683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/06/2023] [Accepted: 06/06/2023] [Indexed: 06/09/2023]
Abstract
Base metal catalyzed transfer hydrogenation reactions using methanol is highly challenging. Employing a single N-heterocyclic carbene (NHC)-based pincer (CNC)MnI complex, chemoselective single and double transfer hydrogenation of α, β-unsaturated ketones to saturated ketones or alcohols by utilizing methanol as the hydrogen source is disclosed. The protocol was tolerant towards the selective transfer hydrogenation of C=C or C=O bonds in the presence of several other reducible functional groups and led to the synthesis of several biologically relevant molecules and natural products. Notably, this is the first report of a Mn-catalyzed transfer hydrogenation of carbonyl groups with methanol. Several control experiments, kinetic studies, Hammett studies, and density functional theory (DFT) calculations were carried out to understand the mechanistic details of this catalytic process.
Collapse
Affiliation(s)
- Adarsha Mandal
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, Kanpur, India
| | - Kasturi Ganguli
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, Kanpur, India
| | - Manoj Pradhan
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, Kanpur, India
| | - Akhanda Gorai
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, Kanpur, India
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology Kanpur, 208016, Kanpur, India
| |
Collapse
|
4
|
Zhang Z, Zhou Y, Zhao H, Wu Y, Sun L. Switching the chemoselectivity of perakine reductase for selective reduction of α,β-unsaturated ketones by Arg127 mutation. Chem Commun (Camb) 2023. [PMID: 37248749 DOI: 10.1039/d3cc00850a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The chemoselectivity of perakine reductase (PR) was engineered through rational design. We identified Arg127 as a control site of chemoselectivity. Mutation of Arg127 switched the chemoselectivity of PR between CO and CC or led to non-selectivity towards α,β-unsaturated ketones, leading to the production of allylic alcohols, saturated ketones, or a mixture of both. This study provides an example for developing novel reductases for α,β-unsaturated ketones.
Collapse
Affiliation(s)
- Zehao Zhang
- Department of Pharmacy, Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China.
- Institute of Drug Metabolism and Pharmaceutical Analysis, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Yun Zhou
- Institute of Drug Metabolism and Pharmaceutical Analysis, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Hong Zhao
- Institute of Drug Metabolism and Pharmaceutical Analysis, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Yihang Wu
- Department of Pharmacy, Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Hangzhou 310018, China.
| | - Lianli Sun
- Institute of Drug Metabolism and Pharmaceutical Analysis, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China.
- Jinhua Institute of Zhejiang University, Jinhua 321299, China
| |
Collapse
|
5
|
Goyal V, Bhatt T, Dewangan C, Narani A, Naik G, Balaraman E, Natte K, Jagadeesh RV. Methanol as a Potential Hydrogen Source for Reduction Reactions Enabled by a Commercial Pt/C Catalyst. J Org Chem 2023; 88:2245-2259. [PMID: 36753730 DOI: 10.1021/acs.joc.2c02657] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Catalytic reduction reactions using methanol as a transfer hydrogenating agent is gaining significant attention because this simple alcohol is inexpensive and produced on a bulk scale. Herein, we report the catalytic utilization of methanol as a hydrogen source for the reduction of different functional organic compounds such as nitroarenes, olefins, and carbonyl compounds. The key to the success of this transformation is the use of a commercially available Pt/C catalyst, which enabled the transfer hydrogenation of a series of simple and functionalized nitroarenes-to-anilines, alkenes-to-alkanes, and aldehydes-to-alcohols using methanol as both the solvent and hydrogen donor. The practicability of this Pt-based protocol is showcased by demonstrating catalyst recycling and reusability as well as reaction upscaling. In addition, the Pt/C catalytic system was also adaptable for the N-methylation and N-alkylation of anilines via the borrowing hydrogen process. This work provides a simple and flexible approach to prepare a variety of value-added products from readily available methanol, Pt/C, and other starting materials.
Collapse
Affiliation(s)
- Vishakha Goyal
- Chemical and Material Sciences Division, CSIR─Indian Institute of Petroleum, Mohkampur, Dehradun 248005, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Joggers Road, Kamla Nehru Nagar, Ghaziabad 201 002, Uttar Pradesh, India
| | - Tarun Bhatt
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502 285, Telangana, India
| | - Chitrarekha Dewangan
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502 285, Telangana, India
| | - Anand Narani
- Chemical and Material Sciences Division, CSIR─Indian Institute of Petroleum, Mohkampur, Dehradun 248005, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Joggers Road, Kamla Nehru Nagar, Ghaziabad 201 002, Uttar Pradesh, India
| | - Ganesh Naik
- Chemical and Material Sciences Division, CSIR─Indian Institute of Petroleum, Mohkampur, Dehradun 248005, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-HRDC Campus, Joggers Road, Kamla Nehru Nagar, Ghaziabad 201 002, Uttar Pradesh, India
| | - Ekambaram Balaraman
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati, 517507, India
| | - Kishore Natte
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502 285, Telangana, India
| | | |
Collapse
|