1
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Ren C, Chen S, Yuan Z, Fu R, Cui Y, Ma Z, Li W, Li X. Cobalt Nanoparticles Catalyzed N-Heterocycles Synthesis via Acceptorless Dehydrogenative Coupling. Chemistry 2024; 30:e202402168. [PMID: 39072825 DOI: 10.1002/chem.202402168] [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: 06/04/2024] [Revised: 07/04/2024] [Accepted: 07/27/2024] [Indexed: 07/30/2024]
Abstract
The acceptorless dehydrogenation reaction is a sustainable and atom-economical methodology in organic synthesis, resulting in the byproducts of only hydrogen or water. Herein, a robust Co-Si/CN catalyst (derived from ZIF@SiO2 composite) has been synthesized through a one-step assembly process via pyrolysis and etching. This catalyst has been employed for the acceptorless dehydrogenative coupling of 2-aminoalcohols with secondary alcohols, enabling efficient conversion of various substrates into desired quinoline or pyridine derivatives with a yield of up to 94 %.
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Affiliation(s)
- Changyue Ren
- College of Pharmacy, Zunyi Medical University, Zunyi, Guizhou, 563003, China
| | - Shuiyan Chen
- College of Pharmacy, Zunyi Medical University, Zunyi, Guizhou, 563003, China
| | - Zeli Yuan
- College of Pharmacy, Zunyi Medical University, Zunyi, Guizhou, 563003, China
| | - Rui Fu
- School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu, 213164, China
| | - Yanbin Cui
- Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, Guangdong, 510640, China
| | - Zhuang Ma
- College of Pharmacy, Zunyi Medical University, Zunyi, Guizhou, 563003, China
| | - Weizuo Li
- School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu, 213164, China
| | - Xinmin Li
- College of Pharmacy, Zunyi Medical University, Zunyi, Guizhou, 563003, China
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2
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Kukreti P, Chauhan R, Panwar A, Ghosh K. A multi-component synthetic route for 2-pyrazolines via acceptorless dehydrogenation of alcohols using homogeneous Ni(II) catalysts. Org Biomol Chem 2024. [PMID: 39318345 DOI: 10.1039/d4ob01352b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2024]
Abstract
Herein, we present the first efficient and sustainable multicomponent synthesis (MCS) of 2-pyrazolines using acceptorless dehydrogenation of benzyl alcohols catalysed by nickel(II) catalysts. Two air-stable phosphine free nickel(II) complexes anchored by NNN-type pincer ligands were synthesized and efficiently used in the MCS of 40 distinct pyrazoline derivatives.
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Affiliation(s)
- Prashant Kukreti
- Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India.
| | - Rahul Chauhan
- Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India.
| | - Abhishek Panwar
- Department of Chemistry, National Institute of Technology Manipur, Langol-795004, Imphal West, Manipur, India
| | - Kaushik Ghosh
- Department of Chemistry, Indian Institute of Technology, Roorkee 247667, India.
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3
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Saha R, Maharana SK, Jana NC, Bagh B. Copper-catalyzed C(sp 3)-H alkylation of fluorene with primary and secondary alcohols using a borrowing hydrogen method. Chem Commun (Camb) 2024; 60:10144-10147. [PMID: 39189332 DOI: 10.1039/d4cc03310h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
Despite the limited success of copper-catalyzed alkylations, (NNS)CuCl proved to be an effective catalyst for the sp3 C-H alkylation of fluorene with alcohols. Various primary alcohols and challenging secondary alcohols were successfully used. The practical applicability of the method was effectively tested with several post-functionalization reactions. This copper-catalyzed alkylation of fluorene involved a borrowing hydrogen mechanism.
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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, 752050, India.
| | - Suraj Kumar Maharana
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Jatni, Khurda, Odisha, 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, 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, 752050, India.
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4
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Bettoni L, Joly N, Mendas I, Moscogiuri MM, Lohier JF, Gaillard S, Poater A, Renaud JL. Iron-catalyzed synthesis of substituted 3-arylquinolin-2(1 H)-ones via an intramolecular dehydrogenative coupling of amido-alcohols. Org Biomol Chem 2024; 22:6933-6940. [PMID: 39120496 DOI: 10.1039/d4ob00649f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Here we report an iron-complex-catalyzed synthesis of various mono- and di-substituted quinolin-2(1H)-ones achieved via the intramolecular acceptorless dehydrogenative cyclization of amido-alcohols. This approach for the synthesis of N-heterocycles has provided access to underdescribed disubstituted quinolinones and represents an alternative to the well-known palladium-catalyzed coupling reactions.
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Affiliation(s)
- Léo Bettoni
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
| | - Nicolas Joly
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Mª Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain.
| | - Inès Mendas
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
| | - Matteo Maria Moscogiuri
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
| | - Jean-François Lohier
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
| | - Sylvain Gaillard
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
| | - Albert Poater
- Departament de Química, Institut de Química Computacional i Catàlisi (IQCC), University of Girona, c/Mª Aurèlia Capmany 69, 17003 Girona, Catalonia, Spain.
| | - Jean-Luc Renaud
- Normandie Univ, LCMT, ENSICAEN, UNICAEN, CNRS, 6 boulevard du Maréchal Juin, 14000 Caen, France.
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, 75005 Paris, France
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5
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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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6
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Paul B, Panja D, Kundu S. Synthesis of N-heterocycles through alcohol dehydrogenative coupling. Nat Protoc 2024:10.1038/s41596-024-01031-w. [PMID: 39174661 DOI: 10.1038/s41596-024-01031-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 05/24/2024] [Indexed: 08/24/2024]
Abstract
Nitrogen heterocycles are found in the structures of many biologically important compounds, as well as materials used in the synthesis of fine chemicals. Notably, ~59% of US Food and Drug Administration-approved small-molecule drugs contain nitrogen heterocycles. It is therefore meaningful to explore greener or more sustainable methods for their synthesis. The use of alcohols as reagents is attractive as they can be readily obtained from biomass derived natural resources. In the last two decades, alcohol dehydrogenative coupling reaction to synthesize various heterocycles were extensively explored which furnished hydrogen (H2) and water (H2O) as the two greener byproducts. In this protocol, we describe several efficient catalytic transformations to synthesize quinolines, 1,8-naphthyridines, quinoxalines, quinazolines, pyrimidines, benzimidazoles, pyrroles and pyridines, using alcohol as starting materials. We also describe the synthesis of several homogeneous iridium/ruthenium catalysts and heterogeneous cobalt/copper catalysts that can be used in these transformations. The reaction setup is simple; in a Schlenk/reaction tube with magnetic stir-bar, alcohol, corresponding coupling reagents (nucleophiles), catalyst, base and solvent (water or organic solvent such as toluene, dioxane or p-xylene) are added. The reaction mixture is refluxed at the specified temperature (110-150 °C)-either in air or under argon-to furnish these heterocycles. Synthesis of the catalysts takes 3-5 h and the coupling reactions take 4-5 h depending on the target product. The cobalt- and copper-based heterogeneous catalytic systems displayed an good catalyst recyclability.
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Affiliation(s)
- Bhaskar Paul
- Department of Chemistry, University of Oxford, Oxford, UK.
- Department of Chemistry, Indian Institute of Technology Kanpur (IITK), Kanpur, India.
| | - Dibyajyoti Panja
- Department of Chemistry, Indian Institute of Technology Kanpur (IITK), Kanpur, India
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology Kanpur (IITK), Kanpur, India.
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7
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Savarimuthu Selvan C, Rengan R, Malecki JG. One-Pot Sustainable Synthesis of Highly Substituted Pyrimidines via Acceptorless Dehydrogenative Annulation of Alcohols Using Pincer Ni(II)-NNS Catalysts. J Org Chem 2024; 89:11148-11160. [PMID: 39087691 DOI: 10.1021/acs.joc.4c00587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
We report an efficient and sustainable synthesis of highly substituted pyrimidines promoted by nickel(II)-NNS pincer-type complexes via acceptorless dehydrogenative annulations of readily available alcohols, malononitrile, and guanidine/benzamidine salt under eco-friendly conditions for the first time. Different sets of Ni(II) complexes (C1-C3) encapsulated in NNS pincer-type thiosemicarbazone ligands have been synthesized and authenticated by analytical and spectroscopic (Fourier transform infrared, nuclear magnetic resonance, and high-resolution mass spectrometry) techniques. The solid state three-dimensional structure of a representative complex (C2) has been determined with the aid of single crystal XRD analysis and confirms a square planar architecture around the nickel ion. Further, the well-defined Ni(II) complexes have been employed as efficient catalysts for the fabrication of a wide range of 4-aminopyrimidine-5-carbonitrile derivatives (33 examples) from readily available alcohols with suitable coupling partners such as malononitrile and guanidine/benzamidine under eco-friendly conditions. The current catalytic approach affords maximum yields up to 95% utilizing 3 mol % catalyst loading and water/hydrogen as the only byproduct. A feasible catalytic pathway has been proposed based on the different control experiment reactions, which clearly indicate that the coupling reaction proceeds via aldehyde and benzylidenemalononitrile intermediates. The practicability of the current protocol has been demonstrated by the large-scale synthesis of one of the products, 4-amino-2,6-diphenylpyrimidine-5-carbonitrile, and a short synthesis of a cytosine antifungal analogue.
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Affiliation(s)
- Clinton Savarimuthu Selvan
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | - Ramesh Rengan
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, Tamilnadu, India
| | - Jan Grzegorz Malecki
- Department of Crystallography, Institute of Chemistry, University of Silesia, Katowice 40-006, Poland
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8
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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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9
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Bakibillah M, Reja S, Sarkar K, Mukherjee D, Sarkar D, Roy S, Almutairi TM, Islam MS, Das RK. Cp*Ir(III) complexes catalyzed solvent-free synthesis of quinolines, pyrroles and pyridines via an ADC strategy. Org Biomol Chem 2024; 22:4704-4719. [PMID: 38775495 DOI: 10.1039/d4ob00459k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
A trio of Ir(III) complexes that are held together by a picolinamidato moiety were created. In our earlier research, we demonstrated the catalytic activity of the complexes for producing alpha-alkylated ketones from a ketone or secondary alcohol with a primary alcohol in the presence of a catalytic amount of a Cp*Ir(III) catalyst and tBuOK in toluene at 110 °C using the hydrogen-borrowing technique. Earlier many research groups had synthesized quinoline, pyrrole, and pyridine derivatives using 2-amino alcohol and ketone or secondary alcohol derivatives as starting materials, but in all those cases the reaction conditions are not suitable in terms of green synthesis like more catalyst loading, base loading, long reaction time, and high temperature. In addition, most of the reactions contain phosphine a hazardous by-product, along with the catalyst. Keeping in mind these shortcomings, we tried to expand the use of our catalysts after achieving an excellent result in our previous work, and we were successful in producing quinoline, pyrrole, and pyridine derivatives through acceptor-less dehydrogenative coupling (ADC) procedures at 90-110 °C under neat/solvent-free conditions and achieved good to exceptional yields of those nitrogen-containing heterocycles. This methodology is attractive because it is environmentally benign and allows for the "green" synthesis of nitrogen-containing heterocycles. All that is required is a modest quantity of catalyst and base, and the by-products are merely H2O and H2.
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Affiliation(s)
- Md Bakibillah
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | - Sahin Reja
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | - Kaushik Sarkar
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | - Deboshmita Mukherjee
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | - Dilip Sarkar
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | - Sumana Roy
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
| | | | | | - Rajesh Kumar Das
- Department of Chemistry, University of North Bengal, Darjeeling, West Bengal, 734013, India.
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10
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Mahato J, Bera PS, Saha TK. Synthesis of imines from the coupling reaction of alcohols and amines catalyzed by phosphine-free cobalt(II) complexes. Org Biomol Chem 2024; 22:4528-4535. [PMID: 38752768 DOI: 10.1039/d4ob00351a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Phosphine-free, air stable cobalt(II) based complexes (1a and 1b) consisting of ligands L1H2 and L2H2 (L1H2 = N,N'-((1,2-phenylenebis(azaneylylidene))bis(methaneylylidene))diphenol and L2H2 = N,N'-bis(4-diethylaminosalicylidene)-4,5-dichloro-1,2-phenylenediamine) were synthesized and utilized as catalysts in the coupling reaction of alcohols with amines into imines following an acceptorless dehydrogenative pathway. The reactions were carried out in the presence of t-BuOK base with low catalyst loading (1 mol%) in an open atmosphere. The corresponding imines were isolated in moderate to excellent yields. The methodology was screened with different substituted alcohols and amines. The proposed mechanistic pathway of this reaction was ascertained through intermediate mass and 1H NMR analyses. Most of the previously reported 3d transition metal catalysts used in imine synthesis reactions have a phosphine ligand environment, and the reactions were performed under inert conditions. Herein we have developed a sustainable route for the synthesis of imines from the coupling reaction of alcohols with amines under aerial reaction conditions using phosphine-free air stable cobalt catalysts.
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Affiliation(s)
- Jharna Mahato
- Department of Chemistry, National Institute of Technology Durgapur, West Bengal, 713209, India.
| | - Partha Sarathi Bera
- Department of Chemistry, National Institute of Technology Durgapur, West Bengal, 713209, India.
| | - Tanmoy Kumar Saha
- Department of Chemistry, National Institute of Technology Durgapur, West Bengal, 713209, India.
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11
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Kumari S, Roy S, Arora P, Kundu S. Visible light-mediated synthesis of quinazolinones and benzothiadiazine-1,1-dioxides utilizing aliphatic alcohols. Org Biomol Chem 2024; 22:4172-4178. [PMID: 38716563 DOI: 10.1039/d4ob00541d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/23/2024]
Abstract
The activation and utilization of challenging aliphatic alcohols like methanol and ethanol is a very appealing approach to synthesize valuable organic molecules. Utilization of methanol and ethanol as a coupling partner has emerged as a valuable alternative to synthesize industrially relevant N-heterocycles because they can be easily procured from renewable sources unlike other activated coupling partners which are expensive and also unstable. Herein, a mild and metal-free photocatalytic protocol to synthesize quinazolinones and more challenging benzothiadiazine-1,1-dioxides, which is unprecedented at room temperature, is demonstrated. This methodology showcased broad substrate scope and provided important N-heterocycles more efficiently than the transition metal-based high temperature protocols. An unexplored reactivity with allyl alcohol is observed following the developed protocol. A series of control experiments were carried out to understand the mechanism.
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Affiliation(s)
- Saloni Kumari
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Souvik Roy
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Pragya Arora
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India.
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12
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Pennamuthiriyan A, Rengan R. Nickel Pincer Complexes Catalyzed Sustainable Synthesis of 3,4-Dihydro-2 H-1,2,4-benzothiadiazine-1,1-dioxides via Acceptorless Dehydrogenative Coupling of Primary Alcohols. J Org Chem 2024; 89:2494-2504. [PMID: 38326039 DOI: 10.1021/acs.joc.3c02508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
We report the atom-economic and sustainable synthesis of biologically important 3,4-dihydro-2H-1,2,4-benzothiadiazine-1,1-dioxide (DHBD) derivatives from readily available aromatic primary alcohols and 2-aminobenzenesulfonamide catalyzed by nickel(II)-N∧N∧S pincer-type complexes. The synthesized nickel complexes have been well-studied by elemental and spectroscopic (FT-IR, NMR, and HRMS) analyses. The solid-state molecular structure of complex 2 has been authenticated by a single-crystal X-ray diffraction study. Furthermore, a series of 3,4-dihydro-2H-1,2,4-benzothiadiazine-1,1-dioxide derivatives have been synthesized (24 examples) utilizing a 3 mol % Ni(II) catalyst through acceptorless dehydrogenative coupling of benzyl alcohols with benzenesulfonamide. Gratifyingly, the catalytic protocol is highly selective with the yield up to 93% and produces eco-friendly water/hydrogen gas as byproducts. The control experiments and plausible mechanistic investigations indicate that the coupling of the in situ generated aldehyde with benzenesulfonamide leads to the desired product. In addition, a large-scale synthesis of one of the thiadiazine derivatives unveils the synthetic usefulness of the current methodology.
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Affiliation(s)
- Anandaraj Pennamuthiriyan
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, Tamilnadu, India
| | - Ramesh Rengan
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620024, Tamilnadu, India
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13
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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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14
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Pal D, Mondal A, Sarmah R, Srimani D. Designing Cobalt(II) Complexes for Tandem Dehydrogenative Synthesis of Quinoline and Quinazoline Derivatives. Org Lett 2024. [PMID: 38194364 DOI: 10.1021/acs.orglett.3c03944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
In this work, we have constructed three new Co(II) complexes in which steric features govern their structural geometry. The metal ligand-cooperation behavior of the alkoxy arm is utilized to explore the catalytic activities of these complexes with respect to dehydrogenation. A wide range of C-3-substituted quinoline and quinazoline derivatives were synthesized in high yields. The developed protocol's usefulness is enhanced by the chemoselective transformation of different fatty alcohols to synthesize heterocycles having distal unsaturation. Various kinetic, mechanistic, and control studies were conducted to comprehend the reaction route.
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Affiliation(s)
- Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Rajashri Sarmah
- 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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15
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Rizzo C, Pace A, Pibiri I, Buscemi S, Palumbo Piccionello A. From Conventional to Sustainable Catalytic Approaches for Heterocycles Synthesis. CHEMSUSCHEM 2023:e202301604. [PMID: 38140917 DOI: 10.1002/cssc.202301604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/19/2023] [Accepted: 12/22/2023] [Indexed: 12/24/2023]
Abstract
Synthesis of heterocyclic compounds is fundamental for all the research area in chemistry, from drug synthesis to material science. In this framework, catalysed synthetic methods are of great interest to effective reach such important building blocks. In this review, we will report on some selected examples from the last five years, of the major improvement in the field, focusing on the most important conventional catalytic systems, such as transition metals, organocatalysts, to more sustainable ones such as photocatalysts, iodine-catalysed reaction, electrochemical reactions and green innovative methods.
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Affiliation(s)
- Carla Rizzo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Andrea Pace
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Ivana Pibiri
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Silvestre Buscemi
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
| | - Antonio Palumbo Piccionello
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Italy, University of Palermo, Viale delle Scienze, Ed. 17, 90128, Palermo
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16
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Mocci R, Atzori L, Baratta W, De Luca L, Porcheddu A. N-Alkylation of aromatic amines with alcohols by using a commercially available Ru complex under mild conditions. RSC Adv 2023; 13:34847-34851. [PMID: 38035248 PMCID: PMC10688395 DOI: 10.1039/d3ra06751c] [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: 10/04/2023] [Accepted: 11/09/2023] [Indexed: 12/02/2023] Open
Abstract
An N-alkylation procedure has been developed under very mild conditions using a known commercially available Ru-based catalyst. As a result, a wide range of aromatic primary amines has been selectively alkylated with several primary alcohols, yielding the corresponding secondary amines in high yields. The methodology also enables the methylation of anilines in refluxing methanol and the preparation of a set of heterocycles in a straightforward way.
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Affiliation(s)
- Rita Mocci
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria S.S. 554 bivio per Sestu 09042 Monserrato (CA) Italy
| | - Luciano Atzori
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria S.S. 554 bivio per Sestu 09042 Monserrato (CA) Italy
| | - Walter Baratta
- Dipartimento di Scienze Agroalimentari, Ambientali e Animali, Università degli Studi di Udine via delle Scienze 206 33100 Udine Italy
| | - Lidia De Luca
- Dipartimento di Scienze Chimiche, FIsiche, Matematiche e Naturali, Università degli Studi di Sassari via Vienna 2 07100 Sassari Italy
| | - Andrea Porcheddu
- Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria S.S. 554 bivio per Sestu 09042 Monserrato (CA) Italy
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17
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R T, Yhobu Z, Budagumpi S, Małecki JG, Ghosh A, Limaye AS, R N, Dateer RB. Room-Temperature Synthesis of Biogenic δ-MnO 2 NPs for the Dehydrogenative Coupling of Diamines with Alcohols for Benzimidazole and Quinoxaline Synthesis: An Efficient Catalyst for Electrochemical Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:15474-15486. [PMID: 37874355 DOI: 10.1021/acs.langmuir.3c01749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
An efficient, unique, and eco-friendly biogenic synthesis of single-crystalline δ-phase manganese oxide nanoparticles (MnO2 NPs) using Gliricidia sepium leaves (GSL) extract at room temperature has been revealed for the first time. The active chemicals present in the GSL extract were found to serve as both reducing and stabilizing agents. The catalyst shows an excellent surface area of 301.13 m2 g-1, a mean pore diameter of 4.01 nm, and 39.97% w/w of active metal content. The reactivity of the synthesized catalyst was demonstrated by achieving a one-pot synthesis of benzimidazoles and quinoxalines via an acceptorless dehydrogenative coupling strategy utilizing biorenewable alcohols. The release of hydrogen gas was observed as the only side product and proven by its successful utilization for alkene reduction which supports the mechanistic elucidation. The release of hydrogen gas as a useful byproduct highlights the scientific importance of the present methodology. Additionally, gram-scale synthesis and catalyst recyclability studies are deliberated. Importantly, the δ-MnO2 NP catalyst exhibited superior catalytic activity and high durability toward hydrogen evolution reaction in alkaline media, highlighting the dual use of the catalyst. The δ-MnO2 NPs attain the current density of 10 mA/cm2 at an overpotential of 154 mV with a Tafel slope of 119 mV/dec.
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Affiliation(s)
- Thrilokraj R
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | - Zhoveta Yhobu
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | - Srinivasa Budagumpi
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | | | - Arnab Ghosh
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | - Akshay S Limaye
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | - Nandini R
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
| | - Ramesh B Dateer
- Centre for Nano and Material Sciences, JAIN (Deemed to be University), Jain Global Campus, Bangalore 562112, India
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18
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Kumari S, Joshi A, Borthakur I, Kundu S. Activation of Ethanol via Conjunction of a Photocatalyst and a HAT Reagent for the Synthesis of Benzimidazoles. J Org Chem 2023; 88:11523-11533. [PMID: 37525430 DOI: 10.1021/acs.joc.3c00674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
The transformation of ethanol to value-added chemicals has tremendous potential. However, generally, harsh reaction conditions are needed for the functionalization of ethanol due to its high dehydrogenation energy. Herein, a metal-free photo-mediated activation of challenging ethanol and higher aliphatic alcohols for the synthesis of differently functionalized benzimidazoles under mild conditions is disclosed. The interplay of a photocatalyst and a HAT reagent facilitated the activation of aliphatic alcohols. A wide array of diamines with different functional groups were well tolerated, and the protocol was also extended to N-substituted diamines for the synthesis of industrially important benzimidazoles. A probable catalytic cycle was proposed based on various mechanistic studies.
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Affiliation(s)
- Saloni Kumari
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
| | - Abhisek Joshi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
| | - Ishani Borthakur
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh, India
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19
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Kharazmi A, Ghorbani-Vaghei R, Kharazmi A, Azadbakht R, Koolivand M, Karakaya I, Karimi-Nami R. Reduced graphene oxide/palladium nanoparticle bonded to N,N'-bis(2-aminophenyl)-1,2-ethanediamine: a new, highly efficient and recyclable heterogeneous catalyst for direct synthesis of 2-substituted benzimidazoles via acceptorless dehydrogenative coupling of alcohols and aromatic diamine. RESEARCH ON CHEMICAL INTERMEDIATES 2023. [DOI: 10.1007/s11164-023-05003-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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20
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Rouzifar M, Sobhani S, Farrokhi A, Sansano JM. Cobalt isatin-Schiff-base derivative of MOF as a heterogeneous multifunctional bio-photocatalyst for sunlight-induced tandem air oxidation condensation process. Sci Rep 2023; 13:5115. [PMID: 36991101 DOI: 10.1038/s41598-023-32241-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/24/2023] [Indexed: 03/31/2023] Open
Abstract
A sunlight-induced tandem air oxidation-condensation of alcohols with ortho-substituted anilines or malononitrile for the efficient synthesis of benz-imidazoles/-oxazoles/-thiazoles, or benzylidene malononitrile catalyzed by Co-isatin-Schiff-base-MIL-101(Fe) as a heterogeneous multifunctional bio-photocatalyst is reported. In these reactions, Co-isatin-Schiff-base-MIL-101(Fe) acts both as a photocatalyst, and a Lewis acid to catalyze the reaction of the in-situ formed aldehydes with o-substituted anilines or malononitrile. A significant decrease in the band gap energy and an increase in the characteristic emission of MIL-101(Fe) after functionalization with cobalt Schiff-base according to the DRS analysis and fluorescence spectrophotometry, respectively, indicate that the photocatalytic effectiveness of the catalyst is associated primarily to the synergetic influence of Fe-O cluster and Co-Schiff-base. EPR results obviously pointed out that Co-isatin-Schiff-base-MIL-101(Fe) is capable of creating 1O2 and O2⋅- as active oxygen species under visible light irradiation. Using an inexpensive catalyst, sunlight irradiation, air as a cost-effective and abundant oxidant, and a low amount of the catalyst with recoverability and durability in ethanol as a green solvent, make this methodology as an environmentally friendly process with energy-saving organic synthetic strategies. Furthermore, Co-isatin-Schiff-base-MIL-101(Fe) displays excellent photocatalytic antibacterial activity under sunlight irradiation against E. coli, S. aureus and S. pyogenes. Based on our knowledge, this is the first report of using a bio-photocatalyst for the synthesis of the target molecules.
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Affiliation(s)
- Majid Rouzifar
- Department of Chemistry, College of Sciences, University of Birjand, Birjand, Iran
| | - Sara Sobhani
- Department of Chemistry, College of Sciences, University of Birjand, Birjand, Iran.
| | - Alireza Farrokhi
- Department of Chemistry, College of Sciences, University of Birjand, Birjand, Iran
| | - José Miguel Sansano
- Departamento de Química Orgánica, Facultad de Ciencias, Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad de Alicante, Apdo. 99, 03080, Alicante, Spain
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21
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Pal S, Das S, Chakraborty S, Khanra S, Paul ND. Zn(II)-Catalyzed Multicomponent Sustainable Synthesis of Pyridines in Air. J Org Chem 2023; 88:3650-3665. [PMID: 36854027 DOI: 10.1021/acs.joc.2c02867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Herein, we report a Zn(II)-catalyzed solvent-free sustainable synthesis of tri- and tetra-substituted pyridines using alcohols as the primary feedstock and NH4OAc as the nitrogen source. Using a well-defined air-stable Zn(II)-catalyst, 1a, featuring a redox-active tridentate azo-aromatic pincer, 2-((4-chlorophenyl)diazenyl)-1,10-phenanthroline (La), a wide variety of unsymmetrical 2,4,6-substituted pyridines were prepared by three-component coupling of primary and secondary alcohols with NH4OAc. Catalyst 1a is equally compatible with the four-component coupling. Unsymmetrical 2,4,6-substituted pyridines were also prepared via a four-component coupling of a primary alcohol with two different secondary alcohols and NH4OAc. A series of tetra-substituted pyridines were prepared up to 67% yield by coupling primary and secondary alcohols with 1-phenylpropan-1-one or 1,2-diphenylethan-1-one and NH4OAc. The 1a-catalyzed reactions also proceeded efficiently upon replacing the secondary alcohols with the corresponding ketones, producing the desired tri- and tetra-substituted pyridines in higher yields in a shorter reaction time. A few control experiments were performed to unveil the mechanistic aspects, which indicates that the active participation of the aryl-azo ligand during catalysis enables the Zn(II)-complex to act as an efficient catalyst for the present multicomponent reactions. Aerial oxygen acts as an oxidant during the Zn(II)-catalyzed dehydrogenation of alcohols, producing H2O and H2O2 as byproducts.
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Affiliation(s)
- Subhasree Pal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Siuli Das
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Subhajit Chakraborty
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Subhankar Khanra
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Nanda D Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
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22
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Winand L, Lernoud L, Meyners SA, Kuhr K, Hiller W, Nett M. Myxococcus xanthus as Host for the Production of Benzoxazoles. Chembiochem 2023; 24:e202200635. [PMID: 36484355 DOI: 10.1002/cbic.202200635] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/09/2022] [Accepted: 12/09/2022] [Indexed: 12/13/2022]
Abstract
Benzoxazoles are important structural motifs in pharmaceutical drugs. Here, we present the heterologous production of 3-hydroxyanthranilate-derived benzoxazoles in the host bacterium Myxococcus xanthus following the expression of two genes from the nataxazole biosynthetic gene cluster of Streptomyces sp. Tü 6176. The M. xanthus expression strain achieved a benzoxazole titer of 114.6±7.4 mg L-1 upon precursor supplementation, which is superior to other bacterial production systems. Crosstalk between the heterologously expressed benzoxazole pathway and the endogenous myxochelin pathway led to the combinatorial biosynthesis of benzoxazoles featuring a 2,3-dihydroxybenzoic acid (2,3-DHBA) building block. Subsequent in vitro studies confirmed that this crosstalk is not only due to the availability of 2,3-DHBA in M. xanthus, rather, it is promoted by the adenylating enzyme MxcE from the myxochelin pathway, which contributes to the activation of aryl carboxylic acids and delivers them to benzoxazole biosynthesis.
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Affiliation(s)
- Lea Winand
- Department of Biochemical and Chemical Engineering, Laboratory of Technical Biology, TU Dortmund University, Emil-Figge-Str. 66, 44227, Dortmund, Germany
| | - Lucia Lernoud
- Department of Biochemical and Chemical Engineering, Laboratory of Technical Biology, TU Dortmund University, Emil-Figge-Str. 66, 44227, Dortmund, Germany
| | - Saskia Anna Meyners
- Department of Biochemical and Chemical Engineering, Laboratory of Technical Biology, TU Dortmund University, Emil-Figge-Str. 66, 44227, Dortmund, Germany
| | - Katharina Kuhr
- Department of Biochemical and Chemical Engineering, Laboratory of Technical Biology, TU Dortmund University, Emil-Figge-Str. 66, 44227, Dortmund, Germany
| | - Wolf Hiller
- Department of Chemistry and Chemical Biology, NMR Laboratory, TU Dortmund University, Otto-Hahn-Str. 4a, 44227, Dortmund, Germany
| | - Markus Nett
- Department of Biochemical and Chemical Engineering, Laboratory of Technical Biology, TU Dortmund University, Emil-Figge-Str. 66, 44227, Dortmund, Germany
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23
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Waiba S, Maji K, Maiti M, Maji B. Sustainable Synthesis of α-Hydroxycarboxylic Acids by Manganese Catalyzed Acceptorless Dehydrogenative Coupling of Ethylene Glycol and Primary Alcohols. Angew Chem Int Ed Engl 2023; 62:e202218329. [PMID: 36629750 DOI: 10.1002/anie.202218329] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/12/2023]
Abstract
Herein, we report a straightforward synthesis of valuable α-hydroxycarboxylic acid molecules via an acceptorless dehydrogenative coupling of ethylene glycol and primary alcohols. A bench-stable manganese complex catalyzed the reaction, which is scalable, with the product being isolated with high yields and selectivities under mild conditions. The protocol is environmentally benign, producing water and hydrogen gas as the only byproducts. Methanol can also be used as a C1 source for producing the platform molecule lactic acid, with a high turnover of >104 . The methodology was also used to functionalize alcohols derived from natural products and fatty acids. Furthermore, it was applied for synthesizing α-amino acid, α-thiocarboxylic acid, and several drugs and bioactive molecules, including endogenous metabolites, Danshensu, Enalapril, Lisinopril, and Rosmarinic acid. Preliminary mechanistic studies were performed to shed light on the mechanism involved in the reaction.
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Affiliation(s)
- Satyadeep Waiba
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India.,Present address: Department of Chemistry, Jadavpur University, Kolkata, 700032, India
| | - Kakoli Maji
- 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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24
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Phuc BV, Nguyen NT, Van NTH, Nguyen TL, Nguyen VH, Tran CM, Nguyen H, Nguyen MT, Hung TQ, Dang TT. Facile iodine-promoted synthesis of bis(1-imidazo[1,5- a]pyridyl)arylmethanes and exploration of applications. Chem Commun (Camb) 2023; 59:1947-1950. [PMID: 36637415 DOI: 10.1039/d2cc05419a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A practical strategy for the iodine-promoted synthesis of bis(1-imidazo[1,5-a]pyridyl)arylmethane and its derivatives has been developed. These compounds exhibit high cytotoxicity toward various cancer cell lines and moreover they are promising ligands for the Cu-catalysed synthesis of quinolines.
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Affiliation(s)
- Ban Van Phuc
- Institute of Chemistry, Vietnamese Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Hanoi, Vietnam.
| | - Nina Thi Nguyen
- Faculty of Chemistry, VNU-Hanoi University of Science, 19 Le Thanh Tong, Hanoi, Vietnam.
| | - Nguyen Thi Hong Van
- Faculty of Chemistry, VNU-Hanoi University of Science, 19 Le Thanh Tong, Hanoi, Vietnam.
| | - Thanh Luan Nguyen
- Faculty of Chemistry, VNU-Hanoi University of Science, 19 Le Thanh Tong, Hanoi, Vietnam.
| | - Van Ha Nguyen
- Faculty of Chemistry, VNU-Hanoi University of Science, 19 Le Thanh Tong, Hanoi, Vietnam.
| | - Cong Minh Tran
- Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Hien Nguyen
- Faculty of Chemistry, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
| | - Minh Tho Nguyen
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven B-3001, Belgium
| | - Tran Quang Hung
- Institute of Chemistry, Vietnamese Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Hanoi, Vietnam. .,Graduate University of Science and Technology, Vietnamese Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Hanoi, Vietnam
| | - Tuan Thanh Dang
- Faculty of Chemistry, VNU-Hanoi University of Science, 19 Le Thanh Tong, Hanoi, Vietnam.
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25
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Rana G, Kar A, Kundal S, Musib D, Jana U. DDQ/Fe(NO 3) 3-Catalyzed Aerobic Synthesis of 3-Acyl Indoles and an In Silico Study for the Binding Affinity of N-Tosyl-3-acyl Indoles toward RdRp against SARS-CoV-2. J Org Chem 2023; 88:838-851. [PMID: 36622749 DOI: 10.1021/acs.joc.2c02009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
In the present study, we herein report a DDQ-catalyzed new protocol for the synthesis of substituted 3-acylindoles. Being a potential system for virtual hydrogen storage, introduction of catalytic DDQ in combination with Fe(NO3)3·9H2O and molecular oxygen as co-catalysts offers a regioselective oxo-functionalization of C-3 alkyl-/aryllidine indolines even with scale-up investigations. Intermediate isolation, their spectroscopic characterization, and the density functional theory calculations indicate that the method involves dehydrogenative allylic hydroxylation and 1,3-functional group isomerization/aromatization followed by terminal oxidation to afford 3-acylindoles quantitatively with very high regioselectivity. This method is very general for a large number of substrates with varieties of functional groups tolerance emerging high-yield outcome. Moreover, molecular docking studies were performed for some selected ligands with an RNA-dependent RNA polymerase complex (RdRp complex) of SARS-CoV-2 to illustrate the binding potential of those ligands. The docking results revealed that few of the ligands possess the potential to inhibit the RdRp of SARS-Cov-2 with binding energies (-6.7 to -8.19 kcal/mol), which are comparably higher with respect to the reported binding energies of the conventional re-purposed drugs such as Remdesivir, Ribavirin, and so forth (-4 to -7 kcal/mol).
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Affiliation(s)
- Gopal Rana
- Department of Chemistry, Jadavpur University, Kolkata 700 032, West Bengal, India
| | - Abhishek Kar
- Department of Chemistry, Jadavpur University, Kolkata 700 032, West Bengal, India
| | - Sandip Kundal
- Department of Chemistry, Jadavpur University, Kolkata 700 032, West Bengal, India
| | - Dulal Musib
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal 795004, Manipur, India
| | - Umasish Jana
- Department of Chemistry, Jadavpur University, Kolkata 700 032, West Bengal, India
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26
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Patel P, Patel DM, Vala RM, Patel SG, Upadhyay DB, Pannerselvam Y, Patel HM. Catalyst-Free, Room-Temperature Accessible Regioselective Synthesis of Spiroquinolines and Their Antioxidant Study. ACS OMEGA 2023; 8:444-456. [PMID: 36643529 PMCID: PMC9835643 DOI: 10.1021/acsomega.2c05020] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
An efficient, regioselective, and environmentally benign approach was established using the multicomponent reaction-based synthesis of novel antioxidant spiroquinoline derivatives such as spiro[dioxolo[4,5-g]quinoline], spiro[dioxino[2,3-g]quinoline], and spiro[pyrazolo[4,3-f]quinoline] by reaction of aryl aldehyde, Meldrum's acid, and amine derivatives under an additive-free reaction in aqueous ethanol. Here, two asymmetric carbon centers, three new C-C bonds, and one C-N bond are developed in the final motif. This synthetic methodology offers excellent yields with an easy workup procedure, high diastereoselectivity [d.r. >50:1 (cis/trans)], admirable atom economy, and low E-factor values. Synthesized spiro compounds were investigated for their in vitro antioxidant activity by 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging assays. In the ABTS radical scavenging assay, compounds 4d, 4f, and 4l exhibit excellent potency, and in the DPPH radical scavenging assay, compounds 4a, 4d, 4f, and 4g, exhibit excellent potency.
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Affiliation(s)
- Paras
J. Patel
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar388120, Gujarat, India
| | - Divyang M. Patel
- Department
of Chemistry, AEPS Institute of Science, Ankleshwar393002, Gujarat, India
- Veer
Narmad South Gujarat University, Surat395007, Gujarat, India
| | - Ruturajsinh M. Vala
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar388120, Gujarat, India
| | - Subham G. Patel
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar388120, Gujarat, India
| | - Dipti B. Upadhyay
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar388120, Gujarat, India
| | - Yuvaraj Pannerselvam
- Branch
laboratory, CSIR-North East Institute of
Science & Technology (NEIST), Imphal795004, Manipur, India
| | - Hitendra M. Patel
- Department
of Chemistry, Sardar Patel University, Vallabh Vidyanagar388120, Gujarat, India
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Ivanov SM, Koltun DS. Crystal Structure Analysis of 4-Oxo, 4-hydroxy- and 4-alkyl-7-bromopyrazolo[5,1- c][1,2,4]triazines. JOURNAL OF CHEMICAL CRYSTALLOGRAPHY 2022; 53:1-12. [PMID: 36567741 PMCID: PMC9759054 DOI: 10.1007/s10870-022-00973-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
The crystal structures of 8-R1-7-bromo-3-tert-butyl-1-R2-pyrazolo[5,1-c][1,2,4]triazin-4(1H)-ones 1a-c, 2a,c (R1 = CN, CO2Et, NO2, R2 = H, 1:1 and 3:1 solvates with DMSO; R1 = CN, CO2Et, R2 = CH2Boc), 8-R1-7-bromo-3-tert-butyl-1-R2-1,4-dihydropyrazolo[5,1-c][1,2,4]triazin-4-ols 3a,b (R1 = CN, R2 = n-Bu; R1 = Br, R2 = CH2Boc), 1,4-dihydro- and aromatic 7-R3-3-tert-butyl-4-R4-8-methylpyrazolo[5,1-c][1,2,4]triazines 5a,b, 6 (R3 = H, R4 = n-Pr; R3 = Br, R4 = n-Bu) were investigated by X-ray diffraction analysis. The structural preferences and different packing modes based on the intermolecular interactions were analyzed by the Hirshfeld surface and energy framework analysis. Graphical Abstract The crystal structures of ten 3-tert-butyl-4-oxo, 4-hydroxy- and 4-alkyl-7-bromopyrazolo[5,1-c][1,2,4]triazines including non-solvated, 1:1 and 3:1 solvates with DMSO were investigated by single crystal X-ray diffraction, Hirshfeld surface and energy framework analyses. Supplementary Information The online version contains supplementary material available at 10.1007/s10870-022-00973-x.
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Affiliation(s)
- Sergey M. Ivanov
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, Leninsky Prospekt, 47., Moscow, Russia 119991
| | - Denis S. Koltun
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences, Leninsky Prospekt, 47., Moscow, Russia 119991
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28
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Kishore PS, Gujjarappa R, Putta VPRK, Polina S, Singh V, Malakar CC, Pujar PP. Potassium
tert
‐Butoxide‐Mediated Synthesis of 2‐Aminoquinolines from Alkylnitriles and 2‐Aminobenzaldehyde Derivatives. ChemistrySelect 2022. [DOI: 10.1002/slct.202204238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
| | - Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur, Langol Imphal 795004 Manipur India
| | | | - Saibabu Polina
- Department of Chemistry CHRIST (Deemed to be University) Bangalore 560029 India
| | - Virender Singh
- Department of Chemistry Central University of Punjab Bathinda 151001 Punjab India
| | - Chandi C. Malakar
- Department of Chemistry National Institute of Technology Manipur, Langol Imphal 795004 Manipur India
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29
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Anandaraj P, Ramesh R, Malecki JG. Direct Synthesis of Benzimidazoles by Pd(II) N^N^S-Pincer Type Complexes via Acceptorless Dehydrogenative Coupling of Alcohols with Diamines. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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30
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Trending strategies for the synthesis of quinolinones and isoquinolinones. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133093] [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]
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31
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Shui H, Zhong Y, Luo R, Zhang Z, Huang J, Yang P, Luo N. Cyclometalated iridium complexes-catalyzed acceptorless dehydrogenative coupling reaction: construction of quinoline derivatives and evaluation of their antimicrobial activities. Beilstein J Org Chem 2022; 18:1507-1517. [PMID: 36339464 PMCID: PMC9623133 DOI: 10.3762/bjoc.18.159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/19/2022] [Indexed: 11/24/2022] Open
Abstract
The acceptorless dehydrogenative coupling (ADC) reaction is an efficient method for synthesizing quinoline and its derivatives. In this paper, various substituted quinolines were synthesized from 2-aminobenzyl alcohols and aryl/heteroaryl/alkyl secondary alcohols in one pot via a cyclometalated iridium-catalyzed ADC reaction. This method has some advantages, such as easy availability of raw materials, mild reaction conditions, wide range of substrates, and environmental friendliness which conforms to the principles of green chemistry. Furthermore, a gram-scale experiment with low catalyst loading offers the potential to access the aryl/heteroaryl quinolones in suitable amounts. In addition, the antibacterial and antifungal activities of the synthesized quinolines were evaluated in vitro, and the experimental results showed that the antibacterial activities of compounds 3ab, 3ad, and 3ah against Gram-positive bacteria and compound 3ck against C. albicans were better than the reference drug norfloxacin.
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Affiliation(s)
- Hongling Shui
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
| | - Yuhong Zhong
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
| | - Renshi Luo
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
| | - Zhanyi Zhang
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
| | - Jiuzhong Huang
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
| | - Ping Yang
- Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, P. R. China
| | - Nianhua Luo
- School of Pharmacy, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China
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32
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Hao Z, Zhou X, Ma Z, Zhang C, Han Z, Lin J, Lu GL. Dehydrogenative Synthesis of Quinolines and Quinazolines via Ligand-Free Cobalt-Catalyzed Cyclization of 2-Aminoaryl Alcohols with Ketones or Nitriles. J Org Chem 2022; 87:12596-12607. [PMID: 36162131 DOI: 10.1021/acs.joc.2c00734] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present a convenient and efficient protocol to synthesize quinolines and quinazolines in one pot under mild conditions. A variety of substituted quinolines were synthesized in good to excellent yields (up to 97% yield) from the dehydrogenative cyclizations of 2-aminoaryl alcohols and ketones catalyzed by readily available Co(OAc)2·4H2O. This cobalt catalytic system also showed high activity in the reactions of 2-aminobenzyl alcohols with nitriles, affording various quinazoline derivatives (up to 95% yield). The present protocol offers an environmentally benign approach for the synthesis of N-heterocycles by employing an earth-abundant cobalt salt under ligand-free conditions.
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Affiliation(s)
- Zhiqiang Hao
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Xiaoyu Zhou
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Zongwen Ma
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Caicai Zhang
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Zhangang Han
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Jin Lin
- National Experimental Chemistry Teaching Center (Hebei Normal University), Hebei Key Laboratory of Organic Functional Molecules, College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, People's Republic of China
| | - Guo-Liang Lu
- Auckland Cancer Society Research Centre, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.,Maurice Wilkins Centre, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand
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Ha MT, Nguyen NT, Tran NH, Ho QV, Son NT, Nguyen VH, Nguyen H, Do DV, Hung TQ, Mai BK, Dang TT. Cu‐catalyzed Synthesis of Quinolines by Dehydrogenative Reaction of 2‐Aminobenzyl Alcohol and Ketones: A Combined Experimental and Computational Study. Chem Asian J 2022; 17:e202200909. [DOI: 10.1002/asia.202200909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/15/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Minh Tuan Ha
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Nina Thi Nguyen
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Ngoc Huyen Tran
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Quoc Viet Ho
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Nguyen Thi Son
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Van Ha Nguyen
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Hien Nguyen
- Hanoi National University of Education Department of Chemistry VIET NAM
| | - Dang Van Do
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
| | - Tran Quang Hung
- Vietnamese Academy of Science: Vietnam Academy of Science and Technology Department of Chemistry VIET NAM
| | - Binh Khanh Mai
- University of Pittsburgh Department of Chemistry 219 Parkman Avenue 15260 Pittsburgh UNITED STATES
| | - Tuan Thanh Dang
- VNU-HUS: Vietnam National University University of Science Department of Chemistry VIET NAM
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Bhatt S, Meena N, Kumar M, Bhuvanesh N, Kumar A, Sharma AK, Joshi H. Design and Syntheses of Ruthenium ENE (E = S, Se) Pincer Complexes: A Versatile System for Catalytic and Biological Applications. Chem Asian J 2022; 17:e202200736. [PMID: 36065146 DOI: 10.1002/asia.202200736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/24/2022] [Indexed: 11/09/2022]
Abstract
This report describes synthesis of two ruthenium(II) ENE pincer complexes (E = S, C1 and E = Se, C2 ) by the reaction of bis(2-(phenylchalcogenyl)ethyl)amine ( L1 , L2 ) with RuCl 2 (PPh 3 ) 3 . The complexes were characterized with the help of 1 H and 13 C{ 1 H} NMR, FTIR, HRMS, cyclic voltammetry and elemental analysis techniques. The structure and bonding mode of ligand with ruthenium in C2 was established with the help of single crystal X-ray diffraction. The complex showed distorted octahedral geometry with two chlorine atoms trans to each other. The Ru-Se bond distances (Å) are 2.4564(3)-2.4630(3), Ru-N distance is 2.181(2), Ru-P distance is 2.2999(6), and Ru-Cl distances are 2.4078(6)-2.4314(6). The complexes showed good to excellent catalytic activity for the N -alkylation of 1,2-phenylenediamine with benzyl alcohol derivatives to synthesize 1,2-disubstituted benzimidazole derivatives. The complexes were also found to be efficient for aerobic oxidation of benzyl alcohols to corresponding aldehydes which are precursors to the bisimines generated in situ during the synthesis of 1,2-disubstituted benzimidazole derivatives. Complex C2 where selenium is coordinated with ruthenium was found to be more efficient as compared to sulfur coordinated ruthenium complex C1 . Since ruthenium complexes are getting increasing attention for developing new anticancer agents, the preliminary studies like binding behavior of both the complexes towards CT-DNA were studied by competitive binding with ethidium bromide (EthBr) using emission spectroscopy. In addition, the interactions of C1-C2 were also studied with bovine serum albumin (BSA) using steady state fluorescence quenching and synchronous fluorescence studies. A good stability of Ru(II) state was observed by cyclic voltammetric studies of C1-C2 . Overall these molecules are good examples of bio-organometallic systems for catalytic and biological applications.
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Affiliation(s)
| | - Neha Meena
- BITS Pilani: Birla Institute of Technology and Science, Chemistry, INDIA
| | - Mukesh Kumar
- Central University of Rajasthan, Chemistry, INDIA
| | - Nattamai Bhuvanesh
- Texas A&M University College Station: Texas A&M University, Chemistry, INDIA
| | - Anil Kumar
- BITS: Birla Institute of Technology & Science Pilani, Chemistry, INDIA
| | | | - Hemant Joshi
- Central University of Rajasthan, Ajmer, Chemistry, Department of Chemistry, Central University of Rajasthan, 305817, Bandarsindri, Ajmer, INDIA
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35
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Borthakur I, Kumari S, Kundu S. Water as a solvent: transition metal catalyzed dehydrogenation of alcohols going green. Dalton Trans 2022; 51:11987-12020. [PMID: 35894592 DOI: 10.1039/d2dt01060g] [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 long-established practice of using organic solvents in synthetic chemistry is currently becoming a major focus of environmental alarms as many of the chemical wastes are generated in the form of organic solvents. Recently, various alternative solvents have been recognized by the scientific community, including water, ionic liquids, supercritical fluids, glycerol, polyethylene glycol, etc. Among these alternatives, water is unquestionably an ideal solvent as it is abundant, cheap, non-toxic, and non-flammable. In the last few decades, a breakthrough has been achieved in the field of transition metal-catalyzed dehydrogenation of alcohols and the related chemistry for the sustainable synthesis of a wide range of valuable compounds. Although a large number of reports with new potential are published every year following this alcohol dehydrogenation strategy, the utilization of water as a solvent in alcohol dehydrogenation and related coupling reactions is yet to be highlighted properly. This review summarizes the advances in metal-catalyzed dehydrogenative functionalization of alcohols using water as a solvent.
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Affiliation(s)
- Ishani Borthakur
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh (U.P.), India.
| | - Saloni Kumari
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh (U.P.), India.
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, Uttar Pradesh (U.P.), India.
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36
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Maji A, Gupta S, Maji M, Kundu S. Well-Defined Phosphine-Free Manganese(II)-Complex-Catalyzed Synthesis of Quinolines, Pyrroles, and Pyridines. J Org Chem 2022; 87:8351-8367. [PMID: 35726206 DOI: 10.1021/acs.joc.2c00167] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Herein, we report a simple, phosphine-free, and inexpensive catalytic system based on a manganese(II) complex for synthesizing different important N-heterocycles such as quinolines, pyrroles, and pyridines from amino alcohols and ketones. Several control experiments, kinetic studies, and DFT calculations were carried out to support the plausible reaction mechanism. We also detected two potential intermediates in the catalytic cycle using ESI-MS analysis. Based on these studies, a metal-ligand cooperative mechanism was proposed.
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Affiliation(s)
- Ankur Maji
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| | - Shivangi Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| | - Milan Maji
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
| | - Sabuj Kundu
- Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India
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37
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Song A, Liu Y, Jin X, Su D, Li Z, Yu S, Xing L, Xu X, Wang R, Li F. Metal-ligand cooperative iridium complex catalyzed C-alkylation of oxindole and 1,3-dimethylbarbituric acid using alcohols. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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38
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Goulart TAC, Recchi AMS, Back DF, Zeni G. Selective 5‐Exo‐Dig versus 6‐Endo‐Dig Cyclization of Benzoimidazole Thiols with Propargyl Alcohols. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tales A. C. Goulart
- Laboratório de Síntese Reatividade Avaliação Farmacológica e Toxicológica de Organocalcogênios CCNE, UFSM Santa Maria, Rio Grande do Sul 97105-900 Brazil
| | - Ana M. S. Recchi
- Laboratório de Síntese Reatividade Avaliação Farmacológica e Toxicológica de Organocalcogênios CCNE, UFSM Santa Maria, Rio Grande do Sul 97105-900 Brazil
| | - Davi F. Back
- Laboratório de Materiais Inorgânicos Departamento de Química, UFSM Santa Maria, Rio Grande do Sul 97105-900 Brazil
| | - Gilson Zeni
- Laboratório de Síntese Reatividade Avaliação Farmacológica e Toxicológica de Organocalcogênios CCNE, UFSM Santa Maria, Rio Grande do Sul 97105-900 Brazil
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39
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Arango-Daza JC, Lluna-Galán C, Izquierdo-Aranda L, Cabrero-Antonino JR, Adam R. Heterogeneous Pd-Catalyzed Efficient Synthesis of Imidazolones via Dehydrogenative Condensation between Ureas and 1,2-Diols. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01423] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Juan Camilo Arango-Daza
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 València, Spain
| | - Carles Lluna-Galán
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 València, Spain
| | - Luis Izquierdo-Aranda
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 València, Spain
| | - Jose R. Cabrero-Antonino
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 València, Spain
| | - Rosa Adam
- Instituto de Tecnología Química (UPV-CSIC), Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas, Av. de los Naranjos s/n, 46022 València, Spain
- Departament de Química Orgànica, Facultat de Farmàcia, Universitat de València, Av. Vicent Andrés Estellés s/n, Burjassot, 46100 València, Spain
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40
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Sundarraman B, Rengan R, Semeril D. NNO Pincer Ligand-Supported Palladium(II) Complexes: Direct Synthesis of Quinazolines via Acceptorless Double Dehydrogenative Coupling of Alcohols. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00062] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Balaji Sundarraman
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, 620 024 Tiruchirappalli, India
| | - Ramesh Rengan
- Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, 620 024 Tiruchirappalli, India
| | - David Semeril
- Laboratoire de Chimie Inorganique et Catalyse, Institut de Chimie, Universite de Strasbourg, UMR 7177, CNRS, 67000 Strasbourg, France
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41
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Guin AK, Mondal R, Chakraborty G, Pal S, Paul ND. Ruthenium-Catalyzed Dehydrogenative Functionalization of Alcohols to Pyrroles: A Comparison between Metal-Ligand Cooperative and Non-cooperative Approaches. J Org Chem 2022; 87:7106-7123. [PMID: 35583483 DOI: 10.1021/acs.joc.2c00311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Herein, we report the synthesis and characterization of two ruthenium-based pincer-type catalysts, [1]X (X = Cl, PF6) and 2, containing two different tridentate pincer ligands, 2-pyrazolyl-(1,10-phenanthroline) (L1) and 2-arylazo-(1,10-phenanthroline) (L2a/2b, L2a = 2-(phenyldiazenyl)-1,10-phenanthroline; L2b = 2-((4-chlorophenyl)diazenyl)-1,10-phenanthroline), and their application in the synthesis of substituted pyrroles via dehydrogenative alcohol functionalization reactions. In catalyst [1]X (X = Cl, PF6), the tridentate scaffold 2-pyrazolyl-(1,10-phenanthroline) (L1) is apparently redox innocent, and all the redox events occur at the metal center, and the coordinated ligands remain as spectators. In contrast, in catalysts 2a and 2b, the coordinated azo-aromatic scaffolds are highly redox-active and known to participate actively during the dehydrogenation of alcohols. A comparison between the catalytic activities of these two catalysts was made, starting from the simple dehydrogenation of alcohols to further dehydrogenative functionalization of alcohols to various substituted pyrroles to understand the advantages/disadvantages of the metal-ligand cooperative approach. Various substituted pyrroles were prepared via dehydrogenative coupling of secondary alcohols and amino alcohols, and the N-substituted pyrroles were synthesized via dehydrogenative coupling of aromatic amines with cis-2-butene-1,4-diol and 2-butyne-1,4-diol, respectively. Several control reactions and spectroscopic experiments were performed to characterize the catalysts and establish the reaction mechanism.
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Affiliation(s)
- Amit Kumar Guin
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Rakesh Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Gargi Chakraborty
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Subhasree Pal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
| | - Nanda D Paul
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Botanic Garden, Howrah 711103, India
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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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43
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Savarimuthu Selvan C, Rengan R, Małecki JG. Concise Access to Perimidines by Palladium (II) Complexes via Acceptorless Dehydrogenative Coupling of Alcohols. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Ramesh Rengan
- Centre for Organometallic Chemistry, School of Chemistry Bharathidasan University Tiruchirappalli India
| | - Jan Grzegorz Małecki
- Department of Crystallography Institute of Chemistry, University of Silesia Katowice Poland
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N E ASWATHIRAVINDRAN, Sindhuja D, Bhuvanesh N, Karvembu R. Synthesis of 1,2‐disubstituted benzimidazoles via acceptorless dehydrogenative coupling using Ru(II)‐arene catalysts containing ferrocene thiosemicarbazone. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200181] [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)
- ASWATHI RAVINDRAN N E
- National Institute of Technology Tiruchirappalli Chemistry 620015 Tiruchirappalli INDIA
| | | | - Nattamai Bhuvanesh
- Texas A&M University College Station: Texas A&M University Chemistry INDIA
| | - R Karvembu
- National Institute of Technology Department of Chemistry Tanjore Road 620015 Tiruchirappalli INDIA
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Hua Y, Lin Y, Chen W, Ye L, Yin Y, Gao Y, Tu S. Copper-catalyzed oxidative cross-dehydrogenative coupling (CDC) reaction of alcohols with secondary phosphine oxides. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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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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Mondal A, Sharma R, Dutta B, Pal D, Srimani D. Well-Defined NNS-Mn Complex Catalyzed Selective Synthesis of C-3 Alkylated Indoles and Bisindolylmethanes Using Alcohols. J Org Chem 2022; 87:3989-4000. [PMID: 35258302 DOI: 10.1021/acs.joc.1c02702] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we demonstrated Mn-catalyzed selective C-3 functionalization of indoles with alcohols. The developed catalyst can also furnish bis(indolyl)methanes from the same set of substrates under slightly modified reaction conditions. Mechanistic studies reveal that the C-3 functionalization of indoles is going via a borrowing hydrogen pathway. To highlight the practical utility, a diverse range of substrates including nine structurally important drug molecules are synthesized. Furthermore, we also introduced a one-pot cascade strategy for synthesizing C-3 functionalized indoles directly from 2-aminophenyl ethanol and alcohol.
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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
| | - Bishal Dutta
- 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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Liu M, Xu L, Wei Y. Electrochemical utilization of methanol and methanol-d4 as a C1 source to access (deuterated) 2,3-dihydroquinazolin-4(1H)-one. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.09.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Pan M, Wang X, Tong Y, Qiu X, Zeng X, Xiong B. Ruthenium-catalyzed acceptorless dehydrogenative coupling of amino alcohols and ynones to access 3-acylpyrroles. Chem Commun (Camb) 2022; 58:2379-2382. [PMID: 35080540 DOI: 10.1039/d1cc07018e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Herein, a new strategy for the direct synthesis of functionalized pyrroles from β-amino alcohols and ynones via ruthenium-catalyzed acceptorless dehydrogenative coupling has been demonstrated. This developed methodology proceeds in an atom- and step-economic fashion together with the merits of broad substrate scope, operational simplicity, and water and hydrogen gas as the sole by-products, which provides an alternative and sustainable way to access functionalized pyrroles. Further, this method was applied to the rapid synthesis of the COX-1/COX-2 inhibitor and boron dipyrromethene derivative successfully.
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Affiliation(s)
- Mingshi Pan
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
| | - Xiabin Wang
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
| | - Yixin Tong
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
| | - Xiaodong Qiu
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
| | - Xiaobao Zeng
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
| | - Biao Xiong
- School of Pharmacy, Nantong University, 19 Qixiu Road, Nantong, Jiangsu Province 226001, China.
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Panigrahi D, Mondal M, Gupta R, Mani G. Four- and five-coordinate nickel(ii) complexes bearing new diphosphine-phosphonite and triphosphine-phosphite ligands: catalysts for N-alkylation of amines. RSC Adv 2022; 12:4510-4520. [PMID: 35425522 PMCID: PMC8981024 DOI: 10.1039/d1ra08961g] [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: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 11/21/2022] Open
Abstract
The reaction of Ph2PCH2OH with PhPCl2 and PCl3 in the presence of Et3N afforded new phosphonite compounds PhP(OCH2PPh2)21 and P(OCH2PPh2)32, respectively. The reaction between 1 and [NiCl2(DME)] in dichloromethane gave the five-coordinate complex [NiCl2(1-κ3 P,P,P)] 3. Conversely, 1 reacts with [NiCl2(DME)] in the presence of NH4PF6 in dichloromethane to yield the four coordinate ionic complex [NiCl(1-κ3 P,P,P)][PF6] 4. The reactions between 1, [NiCl2(DME)] and KPF6 in the presence of RNC (R = Xylyl, t Bu and iPr) in dichloromethane yielded the five coordinate monocationic [NiCl(1-κ3 P,P,P)(RNC)][PF6] (R = Xylyl) and dicationic [Ni(1-κ3 P,P,P)(RNC)2][PF6]2 (R = t Bu and iPr) complexes, respectively. The analogous reaction of 2 with [NiCl2(DME)] in the presence of KPF6 gave complex [NiCl(2-κ4 P,P,P,P)][PF6], 8. The structures of all complexes were determined by single crystal X-ray diffraction studies and supported by spectroscopic methods. To demonstrate their catalytic application, N-alkylation reactions between primary aryl amines, benzyl and 4-methoxy benzyl alcohols were found to proceed smoothly in the presence of 2.5 mol% of complexes bearing ligand 1 and <0.5 mmol of KOBu t in toluene at 140 °C. The C-N coupled products were formed in very good yields. Its substrate scope includes sterically encumbered, heterocyclic amines and aliphatic alcohol.
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Affiliation(s)
- Dipankar Panigrahi
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721 302 India +91 3222 282252 +91 3222 282320
| | - Munmun Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721 302 India +91 3222 282252 +91 3222 282320
| | - Rohit Gupta
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721 302 India +91 3222 282252 +91 3222 282320
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology Kharagpur Kharagpur 721 302 India +91 3222 282252 +91 3222 282320
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