1
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Saha R, Hembram BC, Panda S, Ghosh R, Bagh B. Iron-Catalyzed sp 3 C-H Alkylation of Fluorene with Primary and Secondary Alcohols: A Borrowing Hydrogen Approach. J Org Chem 2024. [PMID: 39175426 DOI: 10.1021/acs.joc.4c00819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
The utilization of earth-abundant, cheap, and nontoxic transition metals in important catalytic transformations is essential for sustainable development, and iron has gained significant attention as the most abundant transition metal. A mixture of FeCl2 (3 mol %), phenanthroline (6 mol %), and KOtBu (0.4 eqivalent) was used as an effective catalyst for the sp3 C-H alkylation of fluorene using alcohol as a nonhazardous alkylating partner, and eco-friendly water was formed as the only byproduct. The substrate scope includes a wide range of substituted fluorenes and substituted benzyl alcohols. The reaction is equally effective with challenging secondary alcohols and unactivated aliphatic alcohols. Selective mono-C9-alkylation of fluorenes with alcohols yielded the corresponding products in good isolated yields. Various postfunctionalizations of C-9 alkylated fluorene products were performed to establish the practical utility of this catalytic alkylation. Control experiments suggested a homogeneous reaction path involving borrowing hydrogen mechanism with the formation and subsequent reduction of 9-alkylidene fluorene intermediate.
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Affiliation(s)
- Ratnakar Saha
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, PO Bhimpur-Padanpur, Via Jatni, District Khurda, Odisha, PIN 752050, India
| | - Bhairab Chand Hembram
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, PO Bhimpur-Padanpur, Via Jatni, District Khurda, Odisha, PIN 752050, India
| | - Surajit Panda
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, PO Bhimpur-Padanpur, Via Jatni, District Khurda, Odisha, PIN 752050, India
| | - Rahul Ghosh
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, PO Bhimpur-Padanpur, Via Jatni, District Khurda, Odisha, PIN 752050, India
| | - Bidraha Bagh
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, PO Bhimpur-Padanpur, Via Jatni, District Khurda, Odisha, PIN 752050, India
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2
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Saha R, Hembram BC, Panda S, Jana NC, Bagh B. Iron- and base-catalyzed C(α)-alkylation and one-pot sequential alkylation-hydroxylation of oxindoles with secondary alcohols. Org Biomol Chem 2024; 22:6321-6330. [PMID: 39039931 DOI: 10.1039/d4ob00957f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
The utilization of economical and environmentally benign transition metals in crucial catalytic processes is pivotal for sustainable advancement in synthetic organic chemistry. Iron, as the most abundant transition metal in the Earth's crust, has gained significant attention for this purpose. A combination of FeCl2 (5 mol%) in the presence of phenanthroline (10 mol%) and NaOtBu (1.5 equivalent) proved effective for the C(α)-alkylation of oxindole, employing challenging secondary alcohol as a non-hazardous alkylating agent. The C(α)-alkylation of oxindole was optimized in green solvent or under neat conditions. The substrate scope encompasses a broad array of substituted oxindoles with various secondary alcohols. Further post-functionalization of the C(α)-alkylated oxindole products demonstrated the practical utility of this catalytic alkylation. One-pot C-H hydroxylation of alkylated oxindoles yielded 3-alkyl-3-hydroxy-2-oxindoles using air as the most sustainable oxidant. Low E-factors (3.61 to 4.19) and good Eco-scale scores (74 to 76) of these sustainable catalytic protocols for the alkylation and one-pot sequential alkylation-hydroxylation of oxindoles demonstrated minimum waste generation. Plausible catalytic paths are proposed on the basis of past reports and control experiments, which suggested that a borrowing hydrogen pathway is involved in this alkylation.
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Affiliation(s)
- Ratnakar Saha
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, PIN 752050, India.
| | - Bhairab Chand Hembram
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, PIN 752050, India.
| | - Surajit Panda
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, PIN 752050, India.
| | - Narayan Ch Jana
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, PIN 752050, India.
| | - Bidraha Bagh
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, PIN 752050, India.
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3
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Bera S, Kabadwal LM, Banerjee D. Harnessing alcohols as sustainable reagents for late-stage functionalisation: synthesis of drugs and bio-inspired compounds. Chem Soc Rev 2024; 53:4607-4647. [PMID: 38525675 DOI: 10.1039/d3cs00942d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
Alcohol is ubiquitous with unparalleled structural diversity and thus has wide applications as a native functional group in organic synthesis. It is highly prevalent among biomolecules and offers promising opportunities for the development of chemical libraries. Over the last decade, alcohol has been extensively used as an environmentally friendly chemical for numerous organic transformations. In this review, we collectively discuss the utilisation of alcohol from 2015 to 2023 in various organic transformations and their application toward intermediates of drugs, drug derivatives and natural product-like molecules. Notable features discussed are as follows: (i) sustainable approaches for C-X alkylation (X = C, N, or O) including O-phosphorylation of alcohols, (ii) newer strategies using methanol as a methylating reagent, (iii) allylation of alkenes and alkynes including allylic trifluoromethylations, (iv) alkenylation of N-heterocycles, ketones, sulfones, and ylides towards the synthesis of drug-like molecules, (v) cyclisation and annulation to pharmaceutically active molecules, and (vi) coupling of alcohols with aryl halides or triflates, aryl cyanide and olefins to access drug-like molecules. We summarise the synthesis of over 100 drugs via several approaches, where alcohol was used as one of the potential coupling partners. Additionally, a library of molecules consisting over 60 fatty acids or steroid motifs is documented for late-stage functionalisation including the challenges and opportunities for harnessing alcohols as renewable resources.
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Affiliation(s)
- Sourajit Bera
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Lalit Mohan Kabadwal
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
| | - Debasis Banerjee
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India.
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4
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Mondal S, Chakraborty S, Khanra S, Chakraborty S, Pal S, Brandão P, Paul ND. A Phosphine-Free Air-Stable Mn(II)-Catalyst for Sustainable Synthesis of Quinazolin-4(3 H)-ones, Quinolines, and Quinoxalines in Water. J Org Chem 2024; 89:5250-5265. [PMID: 38554095 DOI: 10.1021/acs.joc.3c02579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2024]
Abstract
The synthesis, characterization, and catalytic application of a new phosphine-free, well-defined, water-soluble, and air-stable Mn(II)-catalyst [Mn(L)(H2O)2Cl](Cl) ([1]Cl) featuring a 1,10-phenanthroline based tridentate pincer ligand, 2-(1H-pyrazol-1-yl)-1,10-phenanthroline (L), in dehydrogenative functionalization of alcohols to various N-heterocycles such as quinazolin-4(3H)-ones, quinolines, and quinoxalines are reported here. A wide array of multisubstituted quinazolin-4(3H)-ones were prepared in water under air following two pathways via the dehydrogenative coupling of alcohols with 2-aminobenzamides and 2-aminobenzonitriles, respectively. 2-Aminobenzyl alcohol and ketones bearing active methylene group were used as coupling partners for synthesizing quinoline derivatives, and various quinoxaline derivatives were prepared by coupling vicinal diols and 1,2-diamines. In all cases, the reaction proceeded smoothly using our Mn(II)-catalyst [1]Cl in water under air, affording the desired N-heterocycles in satisfactory yields starting from cheap and readily accessible precursors. Gram-scale synthesis of the compounds indicates the industrial relevance of our synthetic strategy. Control experiments were performed to understand and unveil the plausible reaction mechanism.
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Affiliation(s)
- Sucheta Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
| | - Subhajit Chakraborty
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
| | - Subhankar Khanra
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
| | - Santana Chakraborty
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
| | - Shrestha Pal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
| | - Paula Brandão
- Departamento de Química/CICECO, Instituto de Materiais de Aveiro, Universidade de Aveiro, Aveiro 3810-193, Portugal
| | - Nanda D Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Botanic Garden, Howrah, Shibpur 711103, India
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5
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Duan YT, Yang B, Wang ZX. Pincer Nickel-Catalyzed Olefination of Alcohols with Benzylphosphine Oxides. Chem Asian J 2024:e202400255. [PMID: 38600033 DOI: 10.1002/asia.202400255] [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: 03/07/2024] [Revised: 04/03/2024] [Accepted: 04/10/2024] [Indexed: 04/12/2024]
Abstract
N,N,P-Pincer nickel complexes effectively catalyze reaction of alcohols with benzylphosphine oxides to form alkenes in good yields. The protocol suits for a wide scope of substrates and generates only E-configurated alkenes. The method also shows good compatibility of functional groups. Methoxy, methylthio, trifluoromethyl, ketal, fluoro, chloro, bromo, thienyl, and furyl groups are tolerated. The mechanism studies support that the reaction proceeds through catalytic dehydrogenation of alcohols to aldehydes or ketones followed by condensation with benzyldiphenylphosphine oxides in the presence of KOtBu.
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Affiliation(s)
- Yu-Tong Duan
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026
| | - Bo Yang
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026
- Frontiers Science Center for Transformative Molecules (FSCTM), Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, P. R. China
| | - Zhong-Xia Wang
- CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026
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6
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Liang Q, Cai Y, Jiang W, Pang M, Fan L, Zhang G. Palladium-catalyzed allylation and carbonylation: access to allylhydrazones and allyl acylhydrazones. Chem Commun (Camb) 2024; 60:1638-1641. [PMID: 38235749 DOI: 10.1039/d3cc05531k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2024]
Abstract
A palladium-catalyzed allylation of hydrazines with allyl alcohols and aldehydes was developed, enabling the syntheses of a series of allylhydrazones in good to excellent yields with high regioselectivity. Furthermore, the four-component tandem allylation carbonylation of hydrazines with allyl alcohols and aldehydes was established using the catalytic system, producing various allyl acylhydrazones. Additionally, the functionalized allyl acylhydrazones could be smoothly constructed with the catalytic system employing allylhydrazones as a partner. The catalytic system exhibited good functional tolerance with excellent regioselectivities and scaled-up capability, overcoming the limitations of chemoselectivity of the multicomponent transformation and poor conversion of the weak nucleophile.
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Affiliation(s)
- Qianqian Liang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Yan Cai
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Wenjun Jiang
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Mengdi Pang
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Liming Fan
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan 030001, China
| | - Guoying Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, Shanxi, 030001, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, China.
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7
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Cui H, Zhang C, Ji Y, Zhang G. A sustainable metal-free and additive-free olefination route to N-heteroazaarenes from methyl-substituted heterocycles and amines. RSC Adv 2024; 14:4339-4344. [PMID: 38304557 PMCID: PMC10828934 DOI: 10.1039/d4ra00189c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 01/22/2024] [Indexed: 02/03/2024] Open
Abstract
A green and sustainable metal-free, additive-free olefination approach is proposed for the facile synthesis of various unsaturated N-heteroazaarenes from simple methyl-substituted heteroarenes and amines. The developed protocol employs only air as the sole oxidant and provides a useful strategy for obtaining various E-selective conjugated heterocyclic olefins. This provides a useful strategy for application in generating grams of a variety of unsaturated N-heteroazaarenes (up to 20.33 grams) and the synthetic imaging agents of STB-8 (2.40 gram) with high regioselectivity in one pot.
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Affiliation(s)
- Hongyi Cui
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences Taiyuan 030001 P. R. China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Chunyan Zhang
- Taiyuan University of Technology Taiyuan 030001 P. R. China
| | - Yuqi Ji
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences Taiyuan 030001 P. R. China
| | - Guoying Zhang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences Taiyuan 030001 P. R. China
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8
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Mondal A, Phukan HJ, Pal D, Kumar S, Roy M, Srimani D. Well-Defined Mn(II)-complex Catalyzed Switchable De(hydrogenative) Csp 3 -H Functionalization of Methyl Heteroarenes: A Sustainable Approach for Diversification of Heterocyclic Motifs. Chemistry 2024; 30:e202303315. [PMID: 37933814 DOI: 10.1002/chem.202303315] [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: 10/09/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 11/08/2023]
Abstract
Catalytic activities of Mn(I) complexes derived from expensive MnBr(CO)5 salt have been explored in various dehydrogenative transformations. However, the reactivity and selectivity of inexpensive high spin Mn(II) complexes are uncommon. Herein, we have synthesized four new Mn(II) complexes and explored switchable alkenylation and alkylation of methyl heteroarenes employing a single Mn(II)catalyst. The developed protocol selectively furnishes a series of functionalized E-heteroarenes and C-alkylated heteroarenes with good to excellent yields. Various medicinally and synthetically useful compounds are successfully synthesized using our developed protocol. Various controls and kinetics experiments were executed to shed light on the mechaism,which reveals that α-C-H bond breaking of alcohol is the slowest step.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Hirak Jyoti Phukan
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Saurabh Kumar
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Mithu Roy
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
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9
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De S, Ranjan P, Chaurasia V, Pal S, Pal S, Pandey P, Bera JK. Synchronous Proton-Hydride Transfer by a Pyrazole-Functionalized Protic Mn(I) Complex in Catalytic Alcohol Dehydrogenative Coupling. Chemistry 2023; 29:e202301758. [PMID: 37490592 DOI: 10.1002/chem.202301758] [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: 06/01/2023] [Revised: 07/23/2023] [Accepted: 07/25/2023] [Indexed: 07/27/2023]
Abstract
A series of Mn(I) complexes Mn(L1 )(CO)3 Br, Mn(L2 )(CO)3 Br, Mn(L1 )(CO)3 (OAc) and Mn(L3 )(CO)3 Br [L1 =2-(5-tert-butyl-1H-pyrazol-3-yl)-1,8-naphthyridine, L2 =2-(5-tert-butyl-1H-pyrazol-3-yl)pyridine, L3 =2-(5-tert-butyl-1-methyl-1H-pyrazol-3-yl)-1,8-naphthyridine] were synthesized and fully characterized. The acid-base equilibrium between the pyrazole and the pyrazolato forms of Mn(L1 )(CO)3 Br was studied by 1 H NMR and UV-vis spectra. These complexes are screened as catalysts for acceptorless dehydrogenative coupling (ADC) of primary alcohols and aromatic diamines for the synthesis of benzimidazole and quinoline derivatives with the release of H2 and H2 O as byproducts. The protic complex Mn(L1 )(CO)3 Br shows the highest catalytic activity for the synthesis of 2-substituted benzimidazole derivatives with broad substrate scope, whereas a related complex [Mn(L3 )(CO)3 Br], which is devoid of the proton responsive β-NH unit, shows significantly reduced catalytic efficiency validating the crucial role of the β-NH functionality for the alcohol dehydrogenation reactions. Control experiments, kinetic and deuterated studies, and density functional theory (DFT) calculations reveal a synchronous hydride-proton transfer by the metal-ligand construct in the alcohol dehydrogenation step.
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Affiliation(s)
- Subhabrata De
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Prabodh Ranjan
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Vishal Chaurasia
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sourav Pal
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Saikat Pal
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Pragati Pandey
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Jitendra K Bera
- Department of Chemistry and, Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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10
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Almutairi N, Vijjamarri S, Du G. Manganese Salan Complexes as Catalysts for Hydrosilylation of Aldehydes and Ketones. Catalysts 2023. [DOI: 10.3390/catal13040665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
Abstract
Manganese has attracted significant recent attention due to its abundance, low toxicity, and versatility in catalysis. In the present study, a series of manganese (III) complexes supported by salan ligands have been synthesized and characterized, and their activity as catalysts in the hydrosilylation of carbonyl compounds was examined. While manganese (III) chloride complexes exhibited minimal catalytic efficacy without activation of silver perchlorate, manganese (III) azide complexes showed good activity in the hydrosilylation of carbonyl compounds. Under optimized reaction conditions, several types of aldehydes and ketones could be reduced with good yields and tolerance to a variety of functional groups. The possible mechanisms of silane activation and hydrosilylation were discussed in light of relevant experimental observations.
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11
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Zhao Y, Zhang L, Tang Y, Pu M, Lei M. A theoretical study of asymmetric ketone hydrogenation catalyzed by Mn complexes: from the catalytic mechanism to the catalyst design. Phys Chem Chem Phys 2022; 24:13365-13375. [PMID: 35608221 DOI: 10.1039/d2cp00818a] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, a density functional theory (DFT) study was performed to investigate asymmetric ketone hydrogenation (AKH) catalyzed by Mn complexes, from the catalytic mechanism to the catalyst design. The calculated results indicated that the Mn(CO)2-PSiNSiP (A1, PSiNSiP = P(Ph)2Si(CH3)2NSi(CH3)2P(Ph)2) pincer complex has potential high catalytic activity for ketone hydrogenation. The Mn(CO)-LYB (B, LYB = P(Ph)2Si(CH3)2NSi(CH3)2P(Me)2) pincer complex was then designed to catalyze AKH with good stereoselectivity. The hydrogen transfer (HT) step is the chirality-determining step. To avoid the enantiomer of Mn(CO)2-LYB, which could eliminate the high stereoselectivity during AKH, novel Mn complexes with quadridentate ligands, such as Mn(CO)-LYC (C, LYC = P(CH3)2CH2Si(CH3)NSi(CH3)(Si(CH3)CH2P(CH3)2)CH2P(Ph)2) and Mn(CO)-LYD (D, LYD = P(CH3)2CH2Si(CH3)NSi(CH3)(Si(CH3)CH2P(CH3)2)CH2P(Cy)2), were designed to drive AKH with medium stereoselectivity. In order to increase the stereoselectivity of AKH, Mn(CO)-LYE (E, LYE = PH2CH2Si(CH3)NSi(CH3)(Si(CH3)CH2P(CH3)2)CH2P(Ph)2) and Mn(CO)-LYF (F, LYF = PH2CH2Si(CH3)NSi(CH3)(Si(CH3)CH2P(CH3)2)CH2P(Cy)2) were further designed and showed very good stereoselectivity, which is due to the lower deformation energy and stronger interactions between the ketone substrates and catalysts. This work may shed light on the design of cheap metal catalysts with a new ligand framework for the asymmetric hydrogenation (AH) of CX bonds (X = O, N).
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Affiliation(s)
- Yaqi Zhao
- State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
| | - Lin Zhang
- State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
| | - Yanhui Tang
- State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China. .,School of Materials Design and Engineering, Beijing Institute of Fashion Technology, Beijing, 100029, P. R. China
| | - Min Pu
- State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
| | - Ming Lei
- State Key Laboratory of Chemical Resource Engineering, Institute of Computational Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, China.
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12
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Das K, Waiba S, Jana A, Maji B. Manganese-catalyzed hydrogenation, dehydrogenation, and hydroelementation reactions. Chem Soc Rev 2022; 51:4386-4464. [PMID: 35583150 DOI: 10.1039/d2cs00093h] [Citation(s) in RCA: 57] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The emerging field of organometallic catalysis has shifted towards research on Earth-abundant transition metals due to their ready availability, economic advantage, and novel properties. In this case, manganese, the third most abundant transition-metal in the Earth's crust, has emerged as one of the leading competitors. Accordingly, a large number of molecularly-defined Mn-complexes has been synthesized and employed for hydrogenation, dehydrogenation, and hydroelementation reactions. In this regard, catalyst design is based on three pillars, namely, metal-ligand bifunctionality, ligand hemilability, and redox activity. Indeed, the developed catalysts not only differ in the number of chelating atoms they possess but also their working principles, thereby leading to different turnover numbers for product molecules. Hence, the critical assessment of molecularly defined manganese catalysts in terms of chelating atoms, reaction conditions, mechanistic pathway, and product turnover number is significant. Herein, we analyze manganese complexes for their catalytic activity, versatility to allow multiple transformations and their routes to convert substrates to target molecules. This article will also be helpful to get significant insight into ligand design, thereby aiding catalysis design.
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Affiliation(s)
- Kuhali Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India.
| | - Satyadeep Waiba
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India.
| | - Akash Jana
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India.
| | - Biplab Maji
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India.
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13
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Zeng M, Yuan ZX, Wen LF, Jiang D, Lu H, Liu W, Dai J, Zeng SX. The copper-catalyzed oxidation of arylmethyl triazines with H 2O toward the oxidant-free synthesis of aroyl triazines. Org Biomol Chem 2022; 20:5406-5411. [PMID: 35521790 DOI: 10.1039/d2ob00582d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We report an efficient copper-catalyzed dehydrogenation method for the synthesis of aroyl triazines from arylmethyl triazines with water in the absence of additional oxidants or hydrogen acceptors. The use of substrates with both electron-donating and electron-withdrawing groups resulted in moderate to good yields. Using liquid chromatography-mass spectrometry, 18O-labeled-water reactions and hydrogen capture experiments confirmed that water was the only oxygen donor and hydrogen was the by-product. This oxidation strategy provides a new approach for the synthesis of aroyl triazines with a broad substrate scope.
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Affiliation(s)
- Ming Zeng
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Zi-Xin Yuan
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Lin-Fei Wen
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Dengzhao Jiang
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Hui Lu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, China
| | - Wenbo Liu
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Jun Dai
- School of Pharmacy and Life Science, Jiujiang University, Jiujiang 332005, China.
| | - Shen-Xin Zeng
- School of Pharmacy, Hangzhou Medical College, Hangzhou, 311399, China.
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14
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Marques MMB, Royo B, Raydan D, Friães S, Viduedo N, Santos AS, Gomes C. Manganese-catalyzed Synthesis of Imines from Primary Alcohols and Aromatic Amines. Synlett 2022. [DOI: 10.1055/a-1828-1678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Herein, we describe the synthesis of a wide variety of imines through oxidative coupling of alcohols and (hetero)aromatic amines catalyzed by Mn complexes bearing N^N triazole ligands. A wide variety of imines in excellent yields (up to 99%) have been prepared. Mn-based catalysts proved to be highly efficient and versatile, allowing for the first time, the preparation of several imines containing N-based heterocycles.
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Affiliation(s)
- Maria M B Marques
- Chemistry, Universidade Nova de Lisboa Faculdade de Ciencias e Tecnologia, Caparica, Portugal
| | | | | | | | | | - Ana Sofia Santos
- Chemistry, Universidade Nova de Lisboa Faculdade de Ciencias e Tecnologia, Caparica, Portugal
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15
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Cicolella A, C. D'Alterio M, Duran J, Simon S, Talarico G, Poater A. Combining Both Acceptorless Dehydrogenation and Borrowing Hydrogen Mechanisms in One System as Described by DFT Calculations. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alessandra Cicolella
- Institut de Química Computacional i Catàlisi and Departament de Química Universitat de Girona C/ Maria Aurèlia Capmany, 69, Girona Catalonia 17003 Spain
- Dipartimento di Scienze Chimiche Università di Napoli Federico II Via Cintia Napoli I‐80126 Italy
| | - Massimo C. D'Alterio
- Institut de Química Computacional i Catàlisi and Departament de Química Universitat de Girona C/ Maria Aurèlia Capmany, 69, Girona Catalonia 17003 Spain
- Dipartimento di Chimica e Biologia "A. Zambelli" Università di Salerno Via Giovanni Paolo II 132 Fisciano Salerno 84084 Italy
| | - Josep Duran
- Institut de Química Computacional i Catàlisi and Departament de Química Universitat de Girona C/ Maria Aurèlia Capmany, 69, Girona Catalonia 17003 Spain
| | - Sílvia Simon
- Institut de Química Computacional i Catàlisi and Departament de Química Universitat de Girona C/ Maria Aurèlia Capmany, 69, Girona Catalonia 17003 Spain
| | - Giovanni Talarico
- Dipartimento di Scienze Chimiche Università di Napoli Federico II Via Cintia Napoli I‐80126 Italy
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química Universitat de Girona C/ Maria Aurèlia Capmany, 69, Girona Catalonia 17003 Spain
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16
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Waiba S, Maiti M, Maji B. Manganese-Catalyzed Reformation of Vicinal Glycols to α-Hydroxy Carboxylic Acids with the Liberation of Hydrogen Gas. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Satyadeep Waiba
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Mamata Maiti
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Biplab Maji
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
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17
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Su F, Lai M, Zhao M, Song M, Hu X, Zhang J. t
‐BuOK‐Mediated Transition‐Metal‐Free Direct Olefination and Alkylation of Methyl
N
‐Heteroarenes with Primary Alcohols under Control of Temperature. ChemistrySelect 2022. [DOI: 10.1002/slct.202104454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Fangyao Su
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
| | - Miao Lai
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
| | - Mingqin Zhao
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
| | - Mingzhou Song
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
| | - Xin Hu
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
| | - Junqin Zhang
- Flavors and Fragrance Engineering & Technology Research Center of Henan Province, College of Tobacco Science Henan Agricultural University 95 Wenhua Road Zhengzhou 450002 P. R. China
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18
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Shi J, Zeng Z, Xu S, Cai Z, Luo Y, Fan Y, Zhu Z, Wen T, Chen X. Cross-coupling of 2-methylquinolines and in-situ activated isoquinolines: Construction of 1,2-disubstituted isoquinolinones. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.02.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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19
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Gao PP, Xiao WJ, Chen JR. Recent Progresses in Visible-Light-Driven Alkene Synthesis. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202208044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Bhattacharyya D, Adhikari P, Deori K, Das A. Ruthenium pincer complex catalyzed efficient synthesis of quinoline, 2-styrylquinoline and quinazoline derivatives via acceptorless dehydrogenative coupling reactions. Catal Sci Technol 2022. [DOI: 10.1039/d2cy01030e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of N-heterocycles has been considered an emerging area of chemical research due to their extensive utilization in pharmaceuticals, materials science, and natural product synthesis.
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Affiliation(s)
- Dipanjan Bhattacharyya
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Priyanka Adhikari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Kritartha Deori
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Animesh Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
- Centre for Sustainable Polymers, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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21
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Liu X, Guo Z, Liu Y, Chen X, Li J, Zou D, Wu Y, Wu Y. Metal-Free Alkylation of Quinoxalinones with Aryl Alkyl ketones. Org Biomol Chem 2022; 20:1391-1395. [DOI: 10.1039/d1ob02260a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first metal-free method for alkylation of quinoxalinones using cheap and stable aryl alkyl ketones as nucleophilic alkylation reagents is reported. This strategy greatly broadens the application channels of aryl...
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22
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Bera A, Kabadwal LM, Bera S, Banerjee D. Recent advances on non-precious metal-catalyzed C-H functionalization of N-heteroarenes. Chem Commun (Camb) 2021; 58:10-28. [PMID: 34874036 DOI: 10.1039/d1cc05899a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
N-Heteroarenes are widely used for numerous medicinal applications, lifesaving drugs and show utmost importance as intermediates in chemical synthesis. This feature article highlights the recent advances, from 2015 to August 2021, on sp2 and sp3 C-H bond functionalization reactions of various N-heteroarenes catalyzed by non-precious transition metals (Mn, Co, Fe, Ni, etc.). The salient features of the report are: (i) the development of newer catalysis for Csp2-H activation of N-heteroarenes and categorized into alkylation, alkenylation, borylation, cyanation, and annulation reactions, (ii) recent advances on Csp3-H bond functionalization of N-heteroarenes considering newer approaches for alkylation as well as alkenylation processes, and (iii) synthetic applications and practical utility of the catalytic protocols utilized for late-stage drug development; (iv) scope for the development of newer catalytic protocols along with mechanistic studies and detail mechanistic findings of various important processes.
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Affiliation(s)
- Atanu Bera
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Lalit Mohan Kabadwal
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Sourajit Bera
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
| | - Debasis Banerjee
- Department of Chemistry, Laboratory of Catalysis and Organic Synthesis, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
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23
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Pandia BK, Pattanaik S, Gunanathan C. Manganese(I) Catalyzed Alkenylation of Phosphine Oxides Using Alcohols with Liberation of Hydrogen and Water. J Org Chem 2021; 86:17848-17855. [PMID: 34818022 DOI: 10.1021/acs.joc.1c02132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Herein, a catalytic cross-coupling of methyldiphenylphosphine oxide with arylmethyl alcohols leading to the alkenylphosphine oxides is reported. A manganese pincer catalyst catalyzes the reactions, which provides exclusive formation of trans-alkenylphosphine oxides. Mechanistic studies indicate that reactions proceed via aldehyde intermediacy and the catalyst promotes the C═C bond formation. Reactions are facilitated by dearomatization, and aromatization metal-ligand cooperation operates in catalyst. Use of abundant base metal catalyst and formation of water and H2 as the only byproducts make this catalytic protocol sustainable and environmentally benign.
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Affiliation(s)
- Biplab Keshari Pandia
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, 752050, India
| | - Sandip Pattanaik
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, 752050, India
| | - Chidambaram Gunanathan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), HBNI, Bhubaneswar, 752050, India
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24
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Balamurugan G, Ramesh R. Nickel(II)‐Catalyzed Selective
(E)
‐Olefination of Methyl Heteroarenes Using Benzyl Alcohols via Acceptorless Dehydrogenative Coupling Reaction. ChemCatChem 2021. [DOI: 10.1002/cctc.202101455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gunasekaran Balamurugan
- Centre for Organometallic Chemistry School of Chemistry Bharathidasan University Tiruchirappalli 620 024 Tamilnadu India
| | - Rengan Ramesh
- Centre for Organometallic Chemistry School of Chemistry Bharathidasan University Tiruchirappalli 620 024 Tamilnadu India
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25
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Xie R, Mao W, Jia H, Sun J, Lu G, Jiang H, Zhang M. Reductive electrophilic C-H alkylation of quinolines by a reusable iridium nanocatalyst. Chem Sci 2021; 12:13802-13808. [PMID: 34760165 PMCID: PMC8549771 DOI: 10.1039/d1sc02967c] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2021] [Accepted: 09/26/2021] [Indexed: 12/11/2022] Open
Abstract
The incorporation of a coupling step into the reduction of unsaturated systems offers a desirable way for diverse synthesis of functional molecules, but it remains to date a challenge due to the difficulty in controlling the chemoselectivity. Herein, by developing a new heterogeneous iridium catalyst composed of Ir-species (Irδ+) and N-doped SiO2/TiO2 support (Ir/N-SiO2/TiO2), we describe its application in reductive electrophilic mono and dialkylations of quinolines with various 2- or 4-functionalized aryl carbonyls or benzyl alcohols by utilizing renewable formic acid as the reductant. This catalytic transformation offers a practical platform for direct access to a vast range of alkyl THQs, proceeding with excellent step and atom-efficiency, good substrate scope and functional group tolerance, a reusable catalyst and abundantly available feedstocks, and generation of water and carbon dioxide as by-products. The work opens a door to further develop more useful organic transformations under heterogeneous reductive catalysis. By developing a heterogeneous iridium catalyst composed of a N-doped SiO2/TiO2 support and Ir-species (Ir/N-SiO2/TiO2), its application in reductive electrophilic alkylation of quinolines with various aryl carbonyls or benzyl alcohols is presented.![]()
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Affiliation(s)
- Rong Xie
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Wenhui Mao
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Huanhuan Jia
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Jialu Sun
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Guangpeng Lu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
| | - Min Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology Guangzhou 510641 People's Republic of China
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26
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Mondal A, Sharma R, Pal D, Srimani D. Manganese catalyzed switchable C-alkylation/alkenylation of fluorenes and indene with alcohols. Chem Commun (Camb) 2021; 57:10363-10366. [PMID: 34541595 DOI: 10.1039/d1cc03529k] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The usage of earth-abundant, nontoxic transition metals in place of rare noble metals is a central goal in catalysis. This would be especially interesting when the reactivity and selectivity patterns can be tuned. Herein, we introduced the first Mn-catalyzed selective C-alkylation and olefination of fluorene, and indene with alcohols. Various substrates including benzylic, heteroaromatic, and aliphatic primary and secondary alcohols are employed as alkylating agents. Mechanistic investigations and a kinetic study underpin the involvement of the olefinated intermediate to furnish the alkylated product.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Rahul Sharma
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
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27
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Gupta A, Kumar J, Rahaman A, Singh AK, Bhadra S. Functionalization of C(sp3)-H bonds adjacent to heterocycles catalyzed by earth abundant transition metals. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132415] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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28
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Gong L, Zhao H, Yang J, Jiang H, Zhang M. Selective construction of fused heterocycles by an iridium-catalyzed reductive three-component annulation reaction. Chem Commun (Camb) 2021; 57:8292-8295. [PMID: 34318819 DOI: 10.1039/d1cc03332h] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Catalytic conversion of ubiquitously distributed but less reactive N-heteroarenes into functional products remains to date a challenge. Here, through an initial pretreatment of N-heteroarenes with alkyl bromide, we describe a syn-selective construction of functional fused heterocycles via iridium catalyzed reductive annulation of N-heteroarenium salts with formaldehyde and cyclic 1,3-diketones or 4-hydroxycoumarins, proceeding with broad substrate scope, good functional group compatibility, readily available feedstocks, and high step and atom efficiency.
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Affiliation(s)
- Lingzhen Gong
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
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29
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Das K, Barman MK, Maji B. Advancements in multifunctional manganese complexes for catalytic hydrogen transfer reactions. Chem Commun (Camb) 2021; 57:8534-8549. [PMID: 34369488 DOI: 10.1039/d1cc02512k] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Catalytic hydrogen transfer reactions have enormous academic and industrial applications for the production of diverse molecular scaffolds. Over the past few decades, precious late transition-metal catalysts were employed for these reactions. The early transition metals have recently gained much attention due to their lower cost, less toxicity, and overall sustainability. In this regard, manganese, which is the third most abundant transition metal in the Earth's crust, has emerged as a viable alternative. However, the key to the success of such manganese-based complexes lies in the multifunctional ligand design and choice of appropriate ancillary ligands, which helps them mimic and, even in some cases, supersede noble metals' activities. The metal-ligand bifunctionality, achieved via deprotonation of the acidic C-H or N-H bonds, is one of the powerful strategies employed for this purpose. Alongside, the ligand hemilability in which a weakly chelating group tunes in between the coordinated and uncoordinated stages could effectively stabilize the reactive intermediates, thereby facilitating substrate activation and catalysis. Redox non-innocent ligands acting as an electron sink, thereby helping the metal center in steps gaining or losing electrons, and non-classical metal-ligand cooperativity has also played a significant role in the ligand design for manganese catalysis. The strategies were not only employed for the chemoselective hydrogenation of different reducible functionalities but also for the C-X (X = C/N) coupling reactions via HT and downstream cascade processes. This article features multifunctional ligand-based manganese complexes, highlighting the importance of ligand design and choice of ancillary ligands for achieving the desired catalytic activity and selectivity for HT reactions. We have also discussed the detailed reaction pathways for metal complexes involving bifunctionality, hemilability, redox activity, and indirect metal-ligand cooperativity. The synthetic utilization of those complexes in different organic transformations has also been detailed.
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Affiliation(s)
- Kuhali Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India.
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30
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Kaur M, U Din Reshi N, Patra K, Bhattacherya A, Kunnikuruvan S, Bera JK. A Proton-Responsive Pyridyl(benzamide)-Functionalized NHC Ligand on Ir Complex for Alkylation of Ketones and Secondary Alcohols. Chemistry 2021; 27:10737-10748. [PMID: 33998720 DOI: 10.1002/chem.202101360] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Indexed: 12/22/2022]
Abstract
A Cp*Ir(III) complex (1) of a newly designed ligand L1 featuring a proton-responsive pyridyl(benzamide) appended on N-heterocyclic carbene (NHC) has been synthesized. The molecular structure of 1 reveals a dearomatized form of the ligand. The protonation of 1 with HBF4 in tetrahydrofuran gives the corresponding aromatized complex [Cp*Ir(L1 H)Cl]BF4 (2). Both compounds are characterized spectroscopically and by X-ray crystallography. The protonation of 1 with acid is examined by 1 H NMR and UV-vis spectra. The proton-responsive character of 1 is exploited for catalyzing α-alkylation of ketones and β-alkylation of secondary alcohols using primary alcohols as alkylating agents through hydrogen-borrowing methodology. Compound 1 is an effective catalyst for these reactions and exhibits a superior activity in comparison to a structurally similar iridium complex [Cp*Ir(L2 )Cl]PF6 (3) lacking a proton-responsive pendant amide moiety. The catalytic alkylation is characterized by a wide substrate scope, low catalyst and base loadings, and a short reaction time. The catalytic efficacy of 1 is also demonstrated for the syntheses of quinoline and lactone derivatives via acceptorless dehydrogenation, and selective alkylation of two steroids, pregnenolone and testosterone. Detailed mechanistic investigations and DFT calculations substantiate the role of the proton-responsive ligand in the hydrogen-borrowing process.
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Affiliation(s)
- Mandeep Kaur
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Noor U Din Reshi
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Kamaless Patra
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Arindom Bhattacherya
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sooraj Kunnikuruvan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram, 695551, India
| | - Jitendra K Bera
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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31
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Pandia BK, Gunanathan C. Manganese(I) Catalyzed α-Alkenylation of Amides Using Alcohols with Liberation of Hydrogen and Water. J Org Chem 2021; 86:9994-10005. [PMID: 34254806 DOI: 10.1021/acs.joc.1c00685] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Herein, unprecedented manganese-catalyzed direct α-alkenylation of amides using alcohols is reported. Aryl amides are reacted with diverse primary alcohols, which provided the α,β-unsaturated amides in moderate to good yields with excellent selectivity. Mechanistic studies indicate that Mn(I) catalyst oxidizes the alcohols to their corresponding aldehydes and also plays an important role in efficient C═C bond formation through aldol condensation. This selective olefination is facilitated by metal-ligand cooperation by the aromatization-dearomatization process operating in the catalytic system. Biorenewable alcohols are used as alkenylation reagents for the challenging α-alkenylation of amides with the highly abundant base metal manganese as a catalyst, which results in water and dihydrogen as the only byproduct, making this catalytic transformation attractive, sustainable, and environmentally benign.
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Affiliation(s)
- Biplab Keshari Pandia
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute, Bhubaneswar-752050, India
| | - Chidambaram Gunanathan
- School of Chemical Sciences, National Institute of Science Education and Research, Homi Bhabha National Institute, Bhubaneswar-752050, India
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32
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Yang J, Zhao H, Tan Z, Cao L, Jiang H, Ci C, Dixneuf PH, Zhang M. syn-Selective Construction of Fused Heterocycles by Catalytic Reductive Tandem Functionalization of N-Heteroarenes. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01328] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jian Yang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - He Zhao
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Zhenda Tan
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Liang Cao
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Huanfeng Jiang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Chenggang Ci
- Key Laboratory of Computational Catalytic Chemistry of Guizhou Province, Department of Chemistry and Chemical Engineering, Qiannan Normal University for Nationalities, Duyun 558000, P. R. China
| | | | - Min Zhang
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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33
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Sardar B, Jamatia R, Pal D, Srimani D. Multicomponent Dehydrogenative Synthesis of Acridine‐1,8‐diones Catalyzed by Ru‐doped Hydrotalcite. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Bitan Sardar
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
| | - Ramen Jamatia
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
- Department of Chemistry Rajiv Gandhi University Rono Hills Doimukh 791112 Arunachal Pradesh India
| | - Debjyoti Pal
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
| | - Dipankar Srimani
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
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34
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Midya SP, Subaramanian M, Babu R, Yadav V, Balaraman E. Tandem Acceptorless Dehydrogenative Coupling-Decyanation under Nickel Catalysis. J Org Chem 2021; 86:7552-7562. [PMID: 34032425 DOI: 10.1021/acs.joc.1c00592] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The development of new catalytic processes based on abundantly available starting materials by cheap metals is always a fascinating task and marks an important transition in the chemical industry. Herein, a nickel-catalyzed acceptorless dehydrogenative coupling of alcohols with nitriles followed by decyanation of nitriles to access diversely substituted olefins is reported. This unprecedented C═C bond-forming methodology takes place in a tandem manner with the formation of formamide as a sole byproduct. The significant advantages of this strategy are the low-cost nickel catalyst, good functional group compatibility (ether, thioether, halo, cyano, ester, amino, N/O/S heterocycles; 43 examples), synthetic convenience, and high reaction selectivity and efficiency.
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Affiliation(s)
- Siba P Midya
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Tirupati, Tirupati 517507, India
| | - Murugan Subaramanian
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Tirupati, Tirupati 517507, India
| | - Reshma Babu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Tirupati, Tirupati 517507, India
| | - Vinita Yadav
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Ekambaram Balaraman
- Department of Chemistry, Indian Institute of Science Education and Research (IISER)-Tirupati, Tirupati 517507, India
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35
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Dahatonde DJ, Ghosh A, Batra S. Metal‐Free Synthesis of Alkenylazaarenes and 2‐Aminoquinolines through Base‐Mediated Aerobic Oxidative Dehydrogenation of Benzyl Alcohols. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dipak J. Dahatonde
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute BS-10, Jankipuram Extension, Sitapur Road Lucknow 226031, Uttar Pradesh India
| | - Aritra Ghosh
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute BS-10, Jankipuram Extension, Sitapur Road Lucknow 226031, Uttar Pradesh India
- Academy of Scientific and Innovative Research CSIR – Human Resource Development Centre, (CSIR-HRDC) Campus Sector 19, Kamla Nehru Nagar Ghaziabad 201002, Uttar Pradesh India
| | - Sanjay Batra
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute BS-10, Jankipuram Extension, Sitapur Road Lucknow 226031, Uttar Pradesh India
- Academy of Scientific and Innovative Research CSIR – Human Resource Development Centre, (CSIR-HRDC) Campus Sector 19, Kamla Nehru Nagar Ghaziabad 201002, Uttar Pradesh India
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36
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37
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Zhang S, Saji SE, Yin Z, Zhang H, Du Y, Yan CH. Rare-Earth Incorporated Alloy Catalysts: Synthesis, Properties, and Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2005988. [PMID: 33709501 DOI: 10.1002/adma.202005988] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 10/25/2020] [Indexed: 06/12/2023]
Abstract
To improve the performance of metallic catalysts, alloying provides an efficient methodology to design state-of-the-art materials. As emerging functional materials, rare-earth metal compounds can integrate the unique orbital structure and catalytic behavior of rare earth elements into metallic materials. Such rare-earth containing alloy catalysts proffer an opportunity to tailor electronic properties, tune charged carrier transport, and synergize surface reactivity, which are expected to significantly improve the performance and stability of catalysis. Despite its significance, there are only few reviews on rare earth containing alloys or related topics. This review summarizes the composition, synthesis, and applications of rare earth containing alloys in the field of catalysis. Subsequent to comprehensively summarizing and constructively discussing the existing work, the challenges and possibilities of future research on rare-earth metal compound materials are evaluated.
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Affiliation(s)
- Shuai Zhang
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China
| | - Sandra Elizabeth Saji
- Research School of Chemistry, Australian National University, Canberra, 2601, Australia
| | - Zongyou Yin
- Research School of Chemistry, Australian National University, Canberra, 2601, Australia
| | - Hongbo Zhang
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China
| | - Yaping Du
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China
| | - Chun-Hua Yan
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, School of Materials Science and Engineering, National Institute for Advanced Materials, Nankai University, Tianjin, 300350, China
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China
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38
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Mohammadnezhad G, Amirian AM, Görls H, Plass W, Sandleben A, Schäfer S, Klein A. Redox Instability of Copper(II) Complexes of a Triazine‐Based PNP Pincer. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202001129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
| | - Ali Mohammad Amirian
- Department of Chemistry Isfahan University of Technology Isfahan 84156-83111 Iran
- Chemistry Department Faculty of Science Shiraz University Shiraz 71454 Iran
| | - Helmar Görls
- Lehrstuhl für Anorganische Chemie II Institut für Anorganische und Analytische Chemie Friedrich-Schiller-Universität Jena Humboldtstr. 8 07743 Jena Germany
| | - Winfried Plass
- Lehrstuhl für Anorganische Chemie II Institut für Anorganische und Analytische Chemie Friedrich-Schiller-Universität Jena Humboldtstr. 8 07743 Jena Germany
| | - Aaron Sandleben
- Department für Chemie Institut für Anorganische Chemie Universität zu Köln Greinstraße 6 50939 Köln Germany
| | - Sascha Schäfer
- Department für Chemie Institut für Anorganische Chemie Universität zu Köln Greinstraße 6 50939 Köln Germany
| | - Axel Klein
- Chemistry Department Faculty of Science Shiraz University Shiraz 71454 Iran
- Department für Chemie Institut für Anorganische Chemie Universität zu Köln Greinstraße 6 50939 Köln Germany
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39
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Donthireddy SNR, Tiwari CS, Kumar S, Rit A. Atom‐Economic Alk(en)ylations of Esters, Amides, and Methyl Heteroarenes Utilizing Alcohols Following Dehydrogenative Strategies. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000634] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- S. N. R. Donthireddy
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | | | - Shashi Kumar
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Arnab Rit
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
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40
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Thorve PR, Maji B. Deaminative Olefination of Methyl N-Heteroarenes by an Amine Oxidase Inspired Catalyst. Org Lett 2021; 23:542-547. [DOI: 10.1021/acs.orglett.0c04060] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pradip Ramdas Thorve
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
| | - Biplab Maji
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, India
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41
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Gong Y, He J, Wen X, Xi H, Wei Z, Liu W. Transfer hydrogenation of N-heteroarenes with 2-propanol and ethanol enabled by manganese catalysis. Org Chem Front 2021. [DOI: 10.1039/d1qo01552d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A convenient well-defined manganese catalyzed transfer hydrogenation of N-heteroarenes using 2-propanol and ethanol as hydrogen sources is developed. DFT calculations support an outer sphere hydrogenation mechanism.
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Affiliation(s)
- Yingjie Gong
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Jingxi He
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Xiaoting Wen
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Hui Xi
- Key Laboratory of Tobacco Flavor Basic Research of CNTC, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou 450001, China
| | - Zhihong Wei
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China
| | - Weiping Liu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
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42
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Jana A, Kumar A, Maji B. Manganese catalyzed C-alkylation of methyl N-heteroarenes with primary alcohols. Chem Commun (Camb) 2021; 57:3026-3029. [DOI: 10.1039/d1cc00181g] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
C-Alkylations of nine different classes of methyl-substituted N-heteroarenes are disclosed using a bench stable Mn(i)-catalyst under borrowing hydrogen conditions.
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Affiliation(s)
- Akash Jana
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741246
- India
| | - Amol Kumar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741246
- India
| | - Biplab Maji
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur 741246
- India
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43
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Maikhuri VK, Prasad AK, Jha A, Srivastava S. Recent advances in the transition metal catalyzed synthesis of quinoxalines: a review. NEW J CHEM 2021. [DOI: 10.1039/d1nj01442k] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
This review summarizes the recent developments in the synthesis of a variety of substituted quinoxalines using transition metal catalysts.
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Affiliation(s)
- Vipin K. Maikhuri
- Bioorganic Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
| | - Ashok K. Prasad
- Bioorganic Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
| | - Amitabh Jha
- Department of Chemistry
- Acadia University
- Wolfville
- Canada
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44
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Liu X, Werner T. Selective Construction of C−C and C=C Bonds by Manganese Catalyzed Coupling of Alcohols with Phosphorus Ylides. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001209] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Xin Liu
- Leibniz Institute for Catalysis Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Thomas Werner
- Leibniz Institute for Catalysis Albert-Einstein-Straße 29a 18059 Rostock Germany
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45
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Arun V, Roy L, De Sarkar S. Alcohols as Fluoroalkyl Synthons: Ni-catalyzed Dehydrogenative Approach to Access Polyfluoroalkyl Bis-indoles. Chemistry 2020; 26:16649-16654. [PMID: 32914904 DOI: 10.1002/chem.202003912] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Indexed: 01/04/2023]
Abstract
An acceptorless dehydrogenative strategy for the synthesis of polyfluoroalkylated bis-indoles is described by employing an earth-abundant nickel-based catalytic system under air. The notable feature of the present transformation is the use of bench stable and easily affordable polyfluorinated alcohols without any pre-functionalization for the introduction of precious polyfluoroalkyl groups. The developed straightforward protocol accomplished biologically relevant fluoroalkyl bis-indoles in a sustainable fashion. Extensive DFT study predicts the unique role of indole molecules which stabilizes the transition states during the dehydrogenation process of polyfluorinated alcohols, presumably through non-covalent π⋅⋅⋅π and H-bonding interactions.
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Affiliation(s)
- V Arun
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India
| | - Lisa Roy
- Institute of Chemical Technology Mumbai, IOC Odisha Campus Bhubaneswar, IIT Kharagpur Extension Centre, Bhubaneswar, 751013, India
| | - Suman De Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, West Bengal, India
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46
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Selective reductive cross-coupling of N-heteroarenes by an unsymmetrical PNP-ligated manganese catalyst. J Catal 2020. [DOI: 10.1016/j.jcat.2020.09.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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47
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Hofmann N, Homberg L, Hultzsch KC. Synthesis of Tetrahydroquinolines via Borrowing Hydrogen Methodology Using a Manganese PN 3 Pincer Catalyst. Org Lett 2020; 22:7964-7970. [PMID: 32970449 PMCID: PMC7587143 DOI: 10.1021/acs.orglett.0c02905] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
![]()
A straightforward and selective synthesis
of 1,2,3,4-tetrahydroquinolines
starting from 2-aminobenzyl alcohols and simple secondary alcohols
is reported. This one-pot cascade reaction is based on the borrowing
hydrogen methodology promoted by a manganese(I) PN3 pincer
complex. The reaction selectively leads to 1,2,3,4-tetrahydroquinolines
thanks to a targeted choice of base. This strategy provides an atom-efficient
pathway with water as the only byproduct. In addition, no further
reducing agents are required.
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Affiliation(s)
- Natalie Hofmann
- University of Vienna, Faculty of Chemistry, Institute of Chemical Catalysis, Währinger Straße 38, 1090 Vienna, Austria
| | - Leonard Homberg
- University of Vienna, Faculty of Chemistry, Institute of Chemical Catalysis, Währinger Straße 38, 1090 Vienna, Austria
| | - Kai C Hultzsch
- University of Vienna, Faculty of Chemistry, Institute of Chemical Catalysis, Währinger Straße 38, 1090 Vienna, Austria
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48
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Onoda M, Fujita KI. Iridium-Catalyzed C-Alkylation of Methyl Group on N-Heteroaromatic Compounds using Alcohols. Org Lett 2020; 22:7295-7299. [DOI: 10.1021/acs.orglett.0c02635] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mitsuki Onoda
- Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ken-ichi Fujita
- Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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49
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Su C, Zeng M, Zhang C, Cui DM. Ruthenium Catalyzed Divergent Alkylation and Olefination of Methyl 1,3,5-Triazines with Alcohols. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000781] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chengwu Su
- College of Pharmaceutical Science; Zhejiang University of Technology; 310014 Hangzhou China
| | - Ming Zeng
- College of Pharmaceutical Science; Zhejiang University of Technology; 310014 Hangzhou China
| | - Chen Zhang
- College of Pharmaceutical Science; Zhejiang University of Technology; 310014 Hangzhou China
| | - Dong-Mei Cui
- College of Pharmaceutical Science; Zhejiang University of Technology; 310014 Hangzhou China
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50
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Abstract
Our planet urgently needs sustainable solutions to alleviate the anthropogenic global warming and climate change. Homogeneous catalysis has the potential to play a fundamental role in this process, providing novel, efficient, and at the same time eco-friendly routes for both chemicals and energy production. In particular, pincer-type ligation shows promising properties in terms of long-term stability and selectivity, as well as allowing for mild reaction conditions and low catalyst loading. Indeed, pincer complexes have been applied to a plethora of sustainable chemical processes, such as hydrogen release, CO2 capture and conversion, N2 fixation, and biomass valorization for the synthesis of high-value chemicals and fuels. In this work, we show the main advances of the last five years in the use of pincer transition metal complexes in key catalytic processes aiming for a more sustainable chemical and energy production.
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