1
|
Abdullah Al Awadh A. Biomedical applications of selective metal complexes of indole, benzimidazole, benzothiazole and benzoxazole: A review (From 2015 to 2022). Saudi Pharm J 2023; 31:101698. [PMID: 37533494 PMCID: PMC10393588 DOI: 10.1016/j.jsps.2023.101698] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 07/04/2023] [Indexed: 08/04/2023] Open
Abstract
Indole, benzoxazole benzothiazole and benzimidazole are excellent classes of organic heterocyclic compounds. These compounds show significant application in pharmacy, industries, dyes, medicine, polymers and food packages. These compounds also form metal complexes with copper, zinc, cadmium, nickel, cobalt, platinum, gold, palladium chromium, silver, iron, and other metals that have shown to be significant applications. Recently, researchers have attracted enormous attention toward heterocyclic compounds such as indole, benzimidazole, benzothiazole, benzoxazole, and their complexes due to their excellent medicinal applications such as anti-ulcerogenic, anti-cancer, antihypertensive, antifungal, anti-inflammatory, antitubercular, antiparasitic, anti-obesity, antimalarial, antiglycation, antiviral potency, antineuropathic, analgesic antioxidant, antihistaminic, and antibacterial potentials. In this article, we summarize the medicinal applications of these compounds as well as their metal complexes. We hope this article will help researchers in designing and synthesizing novel and potent compounds with significant applications in various fields.
Collapse
|
2
|
Garg A, Goel N, Abhinav N, Varma T, Achari A, Bhattacharjee P, Kamal IM, Chakrabarti S, Ravichandiran V, Reddy AM, Gupta S, Jaisankar P. Virtual screening of natural products inspired in-house library to discover potential lead molecules against the SARS-CoV-2 main protease. J Biomol Struct Dyn 2023; 41:2033-2045. [PMID: 35043750 DOI: 10.1080/07391102.2022.2027271] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
SARS-CoV-2, a new coronavirus emerged in 2019, causing a global healthcare epidemic. Although a variety of drug targets have been identified as potential antiviral therapies, and effective candidate against SARS-CoV-2 remains elusive. One of the most promising targets for combating COVID-19 is SARS-CoV-2 Main protease (Mpro, a protein responsible for viral replication. In this work, an in-house curated library was thoroughly evaluated for druggability against Mpro. We identified four ligands (FG, Q5, P5, and PJ4) as potential inhibitors based on docking scores, predicted binding energies (MMGBSA), in silico ADME, and RMSD trajectory analysis. Among the selected ligands, FG, a natural product from Andrographis nallamalayana, exhibited the highest binding energy of -10.31 kcal/mol close to the docking score of clinical candidates Boceprevir and GC376. Other ligands (P5, natural product from cardiospermum halicacabum and two synthetic molecules Q5 and PJ4) have shown comparable docking scores ranging -7.65 kcal/mol to -7.18 kcal/mol. Interestingly, we found all four top ligands had Pi bond interaction with the main amino acid residues HIS41 and CYS145 (catalytic dyad), H-bonding interactions with GLU166, ARG188, and GLN189, and hydrophobic interactions with MET49 and MET165 in the binding site of Mpro. According to the ADME analysis, Q5 and P5 are within the acceptable range of drug likeliness, compared to FG and PJ4. The interaction stability of the lead molecules with viral protease was verified using replicated MD simulations. Thus, the present study opens up the opportunity of developing drug candidates targeting SARS-CoV-2 main protease (Mpro) to mitigate the disease.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Aakriti Garg
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Narender Goel
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Nipun Abhinav
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Tanmay Varma
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | - Anushree Achari
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Pinaki Bhattacharjee
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Izaz Monir Kamal
- Department of Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Saikat Chakrabarti
- Department of Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Velayutham Ravichandiran
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | | | - Sreya Gupta
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | - Parasuraman Jaisankar
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| |
Collapse
|
3
|
Verma S, Kujur S, Sharma R, Pathak DD. Cucurbit[6]uril-Supported Fe 3O 4 Magnetic Nanoparticles Catalyzed Green and Sustainable Synthesis of 2-Substituted Benzimidazoles via Acceptorless Dehydrogenative Coupling. ACS OMEGA 2022; 7:9754-9764. [PMID: 35350370 PMCID: PMC8945128 DOI: 10.1021/acsomega.1c07350] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 02/25/2022] [Indexed: 06/02/2023]
Abstract
A new composite, cucurbit[6]uril (CB[6])-supported magnetic nanoparticles, Fe3O4-CB[6], was synthesized via a co-precipitation method in air and fully characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, thermogravimetric analysis, inductively coupled plasma-mass spectrometry, and vibrating sample magnetometry techniques. It has been found to be a highly efficient, economic, and sustainable heterogeneous catalyst and has been employed for the first time for the synthesis of a series of biologically important 2-substituted benzimidazoles from various benzyl alcohols and 1,2-diaminobenzenes under solvent-free conditions via acceptorless dehydrogenative coupling to afford the corresponding products in good to excellent yields (68-94%). The magnetic nature of the nanocomposite facilitates the facile recovery of the catalyst from the reaction mixture by an external magnet. The catalyst can be reused up to five times with negligible loss in its catalytic activity. All the isolated products were characterized by 1H and 13C{1H} NMR spectroscopy.
Collapse
Affiliation(s)
- Shruti Verma
- Department
of Chemistry and Chemical Biology, Indian
Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Shelly Kujur
- Department
of Chemistry and Chemical Biology, Indian
Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| | - Richa Sharma
- Department
of Chemistry, Faculty of Science, Dayalbagh
Educational Institute, Dayalbagh, Agra 282005, India
| | - Devendra D. Pathak
- Department
of Chemistry and Chemical Biology, Indian
Institute of Technology (Indian School of Mines), Dhanbad 826004, India
| |
Collapse
|
4
|
Hou H, Ma X, Ye Y, Wu M, Shi S, Zheng W, Lin M, Sun W, Ke F. Non-metal-mediated N-oxyl radical (TEMPO)-induced acceptorless dehydrogenation of N-heterocycles via electrocatalysis. RSC Adv 2022; 12:5483-5488. [PMID: 35425580 PMCID: PMC8981507 DOI: 10.1039/d1ra08919f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 02/01/2022] [Indexed: 11/21/2022] Open
Abstract
The development of protocols for direct catalytic acceptorless dehydrogenation of N-heterocycles with metal-free catalysts holds the key to difficulties in green and sustainable chemistry. Herein, an N-oxyl radical (TEMPO) acting as an oxidant in combination with electrochemistry is used as a synthesis system under neutral conditions to produce N-heterocycles such as benzimidazole and quinazolinone. The key feature of this protocol is the utilization of the TEMPO system as an inexpensive and easy to handle radical surrogate that can effectively promote the dehydrogenation reaction. Mechanistic studies also suggest that oxidative TEMPOs redox catalytic cycle participates in the dehydrogenation of 2,3-dihydro heteroarenes. The development of protocols for direct catalytic acceptorless dehydrogenation of N-heterocycles with metal-free catalysts holds the key to difficulties in green and sustainable chemistry.![]()
Collapse
Affiliation(s)
- Huiqing Hou
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Xinhua Ma
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Yaling Ye
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Mei Wu
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Sunjie Shi
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Wenhe Zheng
- The First Affiliated Hospital of Fujian Medical University, Fuzhou 350004, China
| | - Mei Lin
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Weiming Sun
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| | - Fang Ke
- School of Pharmacy, Fujian Provincial Key Laboratory of Natural Medicine Pharmacology, Fujian Medical University, Fuzhou 350004, China
| |
Collapse
|
5
|
Gujjarappa R, Vodnala N, Musib D, Malakar CC. Organocatalytic Decarboxylation and Dual C(sp
3
)−H Bond Functionalization Toward Facile Access to Divergent 2,6‐Diarylpyridines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
| | - Nagaraju Vodnala
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
- Department of Chemistry Indian Institute of Technology Delhi Multi-storey building, HauzKhas New Delhi 110016 India
| | - Dulal Musib
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
| | - Chandi C. Malakar
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
| |
Collapse
|
6
|
Kabi AK, Gujjarappa R, Roy A, Sahoo A, Musib D, Vodnala N, Singh V, Malakar CC. Transition-Metal-Free Transfer Hydrogenative Cascade Reaction of Nitroarenes with Amines/Alcohols: Redox-Economical Access to Benzimidazoles. J Org Chem 2021; 86:14597-14607. [PMID: 34662119 DOI: 10.1021/acs.joc.1c01450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
This report describes an efficient transition-metal-free process toward the transfer hydrogenative cascade reaction between nitroarenes and amines or alcohols. The developed redox-economical approach was realized using a combination of KOtBu and Et3SiH as reagents, which allows the synthesis of benzimidazole derivatives via σ-bond metathesis. The reaction conditions hold well over a wide range of substrates embedded with diverse functional groups to deliver the desired products in good to excellent yields. The mechanistic proposal has been depicted on the basis of a series of control experiments, mass spectroscopic evidence which is well supported by density functional theory (DFT) calculations with a feasible energy profile.
Collapse
Affiliation(s)
- Arup K Kabi
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| | - Raghuram Gujjarappa
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| | - Anupam Roy
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| | - Abhishek Sahoo
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| | - Dulal Musib
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| | - Nagaraju Vodnala
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India.,Department of Chemistry, Indian Institute of Technology Delhi, Multi-Storey Building, HauzKhas, New Delhi, 110016 India
| | - Virender Singh
- Department of Chemistry, Central University of Punjab, Bathinda, 151401 Punjab, India
| | - Chandi C Malakar
- Department of Chemistry, National Institute of Technology Manipur, Langol, Imphal - 795004, Manipur, India
| |
Collapse
|
7
|
Nguyen HT, Nguyen TH, Pham DD, Nguyen CT, Tran PH. A green approach for the synthesis of 2-substituted benzoxazoles and benzothiazoles via coupling/cyclization reactions. Heliyon 2021; 7:e08309. [PMID: 34820534 PMCID: PMC8601991 DOI: 10.1016/j.heliyon.2021.e08309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 10/10/2021] [Accepted: 10/29/2021] [Indexed: 11/20/2022] Open
Abstract
We have developed the green method for the synthesis of benzoxazoles and benzothiazoles with moderate to good yields using imidazolium chlorozincate (II) ionic liquid supported into Fe3O4 nanoparticles (LAIL@MNP) under solvent-free sonication. The reaction was performed under mild conditions and only produced water as a sole byproduct. The reactions under solvent-free sonication showed advantages of faster reaction rate (30 min) and high yields of the products (up to 90%). Moreover, the LAIL@MNP material was easily separated from the reaction mixture and can be recycled for five consecutive runs with a slight decrease in its catalytic performance (from 82 to 73%).
Collapse
Affiliation(s)
- Hai Truong Nguyen
- Department of Organic Chemistry, Faculty of Chemistry, University of Science, Ho Chi Minh City, Viet Nam
- Vietnam National University, Ho Chi Minh City, Viet Nam
| | - Trinh Hao Nguyen
- Department of Organic Chemistry, Faculty of Chemistry, University of Science, Ho Chi Minh City, Viet Nam
- Vietnam National University, Ho Chi Minh City, Viet Nam
| | - Dung Duc Pham
- Faculty of Chemistry, Ho Chi Minh City University of Education, Viet Nam
| | - Cong Tien Nguyen
- Faculty of Chemistry, Ho Chi Minh City University of Education, Viet Nam
| | - Phuong Hoang Tran
- Department of Organic Chemistry, Faculty of Chemistry, University of Science, Ho Chi Minh City, Viet Nam
- Vietnam National University, Ho Chi Minh City, Viet Nam
| |
Collapse
|
8
|
Ying P, Yu J, Su W. Liquid‐Assisted Grinding Mechanochemistry in the Synthesis of Pharmaceuticals. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001245] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Ping Ying
- College of Pharmaceutical Science Zhejiang University of Technology Hangzhou 310014 People's Republic of China
| | - Jingbo Yu
- National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic of China
| | - Weike Su
- National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic of China
| |
Collapse
|
9
|
Polina S, Putta VPRK, Gujjarappa R, Singh V, Pujar PP, Malakar CC. P(III)‐Mediated Cascade C‐N/C‐S Bond Formation: A Protocol towards the Synthesis of
N
,
S
‐Heterocycles and Spiro Compounds. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Saibabu Polina
- Department of Chemistry CHRIST (Deemed to be University) Bangalore 560029 India
| | | | - Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur 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
| |
Collapse
|
10
|
Ma R, Ding Y, Chen R, Wang Z, Wang L, Ma Y. Oxidant/Solvent-Controlled I 2-Catalyzed Domino Annulation for Selective Synthesis of 2-Aroylbenzothiazoles and 2-Arylbenzothiazoles under Metal-Free Conditions. J Org Chem 2020; 86:310-321. [PMID: 33332126 DOI: 10.1021/acs.joc.0c02095] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A simple and practical domino protocol for the selective synthesis of 2-aroylbenzothiazoles and 2-aryl benzothiazoles catalyzed by I2 is developed under metal-free conditions. The reaction outcomes are exclusively controlled by the reaction oxidant/medium. With DMSO employed as both the solvent and the oxidant, an oxidation of aromatic methyl ketones takes precedence over the condensation with 2-aminobenzenethiols. On the other hand, when the reaction was carried out in PhNO2 or in 1,4-dioxane containing PhNO2, the condensation of aromatic methyl ketones with 2-aminobenzenethiols has priority to form imines which is followed by an oxidation of the methyl group from ketones to afford 2-arylbenzothiazoles as a sole product. The PhNO2/I2 co-catalytic system is proposed first time.
Collapse
Affiliation(s)
- Renchao Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Yuxin Ding
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Rener Chen
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Zhiming Wang
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Lei Wang
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| | - Yongmin Ma
- Institute of Advanced Studies and School of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 318000, P R China
| |
Collapse
|
11
|
Putta RR, Chun S, Choi SH, Lee SB, Oh DC, Hong S. Iron(0)-Catalyzed Transfer Hydrogenative Condensation of Nitroarenes with Alcohols: A Straightforward Approach to Benzoxazoles, Benzothiazoles, and Benzimidazoles. J Org Chem 2020; 85:15396-15405. [DOI: 10.1021/acs.joc.0c02191] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ramachandra Reddy Putta
- BK 21 Plus Project, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Simin Chun
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Seung Hyun Choi
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Seok Beom Lee
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
12
|
Sharma S, Malakar CC, Singh V. Transition‐Metal‐Free C‐S Bond Forming Strategy towards Synthesis of Highly Diverse Pyrazole Tethered Benzothiazoles: Investigation of their Photophysical Properties. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Shubham Sharma
- Shubham Sharma Dr. Virender Singh Department of Chemistry Dr B R Ambedkar National Institute of Technology Jalandhar Punjab 144011 India
| | - Chandi C. Malakar
- Dr. Chandi C. Malakar Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 India
| | - Virender Singh
- Shubham Sharma Dr. Virender Singh Department of Chemistry Dr B R Ambedkar National Institute of Technology Jalandhar Punjab 144011 India
- Dr. Virender Singh Department of Chemistry Central University of Punjab Bathinda Punjab 151001 India
| |
Collapse
|
13
|
Gujjarappa R, Vodnala N, Malakar CC. Recent Advances in Pyridine‐Based Organocatalysis and its Application towards Valuable Chemical Transformations. ChemistrySelect 2020. [DOI: 10.1002/slct.202002765] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of ChemistryNational Institute of Technology Manipur Langol, Imphal 795004, Manipur India
| | - Nagaraju Vodnala
- Department of ChemistryNational Institute of Technology Manipur Langol, Imphal 795004, Manipur India
| | - C. C. Malakar
- Department of ChemistryNational Institute of Technology Manipur Langol, Imphal 795004, Manipur India
| |
Collapse
|
14
|
Transition-metal-free variant of Glaser- and Cadiot-Chodkiewicz-type Coupling: Benign access to diverse 1,3-diynes and related molecules. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151775] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
15
|
Yu X, Zhang Z, Song R, Gou L, Wang G. Synthesis of 2-aryl-benzothiazoles via Ni-catalyzed coupling of benzothiazoles and aryl sulfamates. HETEROCYCL COMMUN 2020. [DOI: 10.1515/hc-2020-0001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Abstract2-Aryl-benzothiazoles have been successfully synthesized via a simple coupling reaction between benzothiazoles and aryl sulfamates using a nickel catalyst. The nickel catalyst is inexpensive, reusable and commercially available. In addition, the use of highly expensive palladium catalysts and unstable raw materials has been avoided. 2-Aryl-benzothiazoles bearing various substituents on the aryl groups were obtained in good yield.
Collapse
Affiliation(s)
- Xiaofeng Yu
- School of Materials and Chemical Engineering, Bengbu University, Bengbu, Anhui 233030, P. R. China
| | - Zhen Zhang
- College of Pharmacy and Biological Engineering, Chengdu University, Sichuan610106, P. R. China
| | - Renyuan Song
- School of Materials and Chemical Engineering, Bengbu University, Bengbu, Anhui 233030, P. R. China
| | - Liping Gou
- School of Materials and Chemical Engineering, Bengbu University, Bengbu, Anhui 233030, P. R. China
| | - Guangrong Wang
- School of Materials and Chemical Engineering, Bengbu University, Bengbu, Anhui 233030, P. R. China
| |
Collapse
|
16
|
Gujjarappa R, Vodnala N, Reddy VG, Malakar CC. Niacin as a Potent Organocatalyst towards the Synthesis of Quinazolines Using Nitriles as C-N Source. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901651] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of Chemistry; National Institute of Technology Manipur, Langol; 795004 Imphal Manipur India
| | - Nagaraju Vodnala
- Department of Chemistry; National Institute of Technology Manipur, Langol; 795004 Imphal Manipur India
| | - Velma Ganga Reddy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC); School of Science; RMIT University; GPO Box 2476 3001 Melbourne Australia
| | - Chandi C. Malakar
- Department of Chemistry; National Institute of Technology Manipur, Langol; 795004 Imphal Manipur India
| |
Collapse
|
17
|
Yu X, Song R, Shi C, Wang G. Sulfamic Acid-Catalyzed Conversion of o-Aminothiophenol and Aromatic Aldehydes to 2-Arylbenzothiazoles. HETEROCYCLES 2020. [DOI: 10.3987/com-20-14253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
|
18
|
Ge B, Peng Y, Liu J, Wen S, Peng C, Cheng G. Acid-promoted cleavage of the C–C double bond of N-(2-Hydroxylphenyl)enaminones for the synthesis of benzoxazoles. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130818] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|