1
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Nguyen KT, Huynh TNT, Ratanathawornkiti K, Juthathan M, Thamyongkit P, Sukwattanasinitt M, Wacharasindhu S. NaI-Mediated Electrochemical Cyclization-Desulfurization for the Synthesis of N-Substituted 2-Aminobenzimidazoles. J Org Chem 2024; 89:1591-1608. [PMID: 38102091 DOI: 10.1021/acs.joc.3c02212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
An electrochemical method for the synthesis of N-substituted 2-aminobenzimidazoles through a NaI-mediated desulfurization-cyclization process is reported. This electrosynthesis method utilizes cost-effective NaI as both a mediator and an electrolyte in a catalytic amount (0.2 equiv), replacing traditional oxidizing reagents. N-Substituted o-phenylenediamines and isothiocyanates undergo a thiourea formation/cyclization/desulfurization process to provide N-substituted 2-aminobenzimidazoles (55 examples, up to 98% yield) in a single reaction vessel. Importantly, this electrochemical methodology is applicable to gram-scale synthesis, maintaining reaction efficiency.
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Affiliation(s)
- Khuyen Thu Nguyen
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Thao Nguyen Thanh Huynh
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Methasit Juthathan
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | - Patchanita Thamyongkit
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
| | | | - Sumrit Wacharasindhu
- Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
- Green Chemistry for Fine Chemical Productions and Environmental Remediation Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
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2
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Yu XL, Fan YH, Zheng XN, Gao JF, Zhuang LG, Yu YL, Xi JH, Zhang DW. Synthesis of Imidazole-Based Molecules under Ultrasonic Irradiation Approaches. Molecules 2023; 28:4845. [PMID: 37375399 DOI: 10.3390/molecules28124845] [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: 05/16/2023] [Revised: 06/04/2023] [Accepted: 06/12/2023] [Indexed: 06/29/2023] Open
Abstract
Imidazole-based compounds are a series of heterocyclic compounds that exhibit a wide range of biological and pharmaceutical activities. However, those extant syntheses using conventional protocols can be time-costly, require harsh conditions, and result in low yields. As a novel and green technique, sonochemistry has emerged as a promising method for organic synthesis with several advantages over conventional methods, including enhancing reaction rates, improving yields, and reducing the use of hazardous solvents. Contemporarily, a growing body of ultrasound-assisted reactions have been applied in the preparation of imidazole derivatives, which demonstrated greater benefits and provided a new strategy. Herein, we introduce the brief history of sonochemistry and focus on the discussion of the multifarious approaches for the synthesis of imidazole-based compounds under ultrasonic irradiation and its advantages in comparison with conventional protocols, including typical name-reactions and various sorts of catalysts in those reactions.
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Affiliation(s)
- Xian-Long Yu
- College of Chemistry, Jilin University, Changchun 130012, China
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Yu-Han Fan
- School of Pharmaceutical Sciences, Jilin University, Changchun 130021, China
| | - Xu-Nan Zheng
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Jing-Fei Gao
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Li-Geng Zhuang
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Yang-Ling Yu
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Jing-Hui Xi
- College of Plant Science, Jilin University, Changchun 130062, China
| | - Da-Wei Zhang
- College of Chemistry, Jilin University, Changchun 130012, China
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3
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Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]. Catalysts 2022. [DOI: 10.3390/catal12111394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Microwave irradiation has been used to enhance the reaction yields and selectivities for organic transformation. In this paper, microwave irradiation (MW) was investigated for the environmentally benign synthesis of benzoxazoles through the cyclization of 2-aminophenols and benzaldehydes using deep eutectic solvent (DES) as a catalyst. The [CholineCl][oxalic acid] was easily synthesized from choline chloride with oxalic acid and used without further purification. [CholineCl][oxalic acid] catalyzed the synthesis of benzoxazoles to produce the desired product in a good to excellent conversion and selectivity under MW irradiation. The presence of [CholineCl][oxalic acid] helps to promote the rapid heating transfer from microwave irradiation into the reaction mixture. The [CholineCl][oxalic acid] can be recovered and reused several times without a considerable degradation in catalytic activity.
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4
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Wanjari PJ, Saha N, Dubey G, Bharatam PV. Metal-free methods for the generation of benzimidazoles and 2-aminobenzimidazoles. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Shabir G, Shafique I, Saeed A. Ultrasound Assisted Synthesis of 5‐7 Membered Heterocyclic Rings in Organic Molecules. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ghulam Shabir
- Department of Chemistry Quaid‐I‐Azam University Islamabad Pakistan
- College of Arts and Science University of Chakwal Punjab Pakistan
| | - Imran Shafique
- Department of Chemistry Quaid‐I‐Azam University Islamabad Pakistan
| | - Aamer Saeed
- Department of Chemistry Quaid‐I‐Azam University Islamabad Pakistan
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6
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Ultrasonic energy for construction of bioactive heterocycles. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Borah B, Chowhan LR. Ultrasound-assisted transition-metal-free catalysis: a sustainable route towards the synthesis of bioactive heterocycles. RSC Adv 2022; 12:14022-14051. [PMID: 35558846 PMCID: PMC9092113 DOI: 10.1039/d2ra02063g] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/27/2022] [Indexed: 12/13/2022] Open
Abstract
Heterocycles of synthetic and natural origin are a well-established class of compounds representing a broad range of organic molecules that constitute over 60% of drugs and agrochemicals in the market or research pipeline. Considering the vast abundance of these structural motifs, the development of chemical processes providing easy access to novel complex target molecules by introducing environmentally benign conditions with the main focus on improving the cost-effectiveness of the chemical transformation is highly demanding and challenging. Accordingly, sonochemistry appears to be an excellent alternative and a highly feasible environmentally benign energy input that has recently received considerable and steadily increasing interest in organic synthesis. However, the involvement of transition-metal-catalyst(s) in a chemical process often triggers an unintended impact on the greenness or sustainability of the transformation. Consequently, enormous efforts have been devoted to developing metal-free routes for assembling various heterocycles of medicinal interest, particularly under ultrasound irradiation. The present review article aims to demonstrate a brief overview of the current progress accomplished in the ultrasound-assisted synthesis of pharmaceutically relevant diverse heterocycles using transition-metal-free catalysis.
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Affiliation(s)
- Biplob Borah
- School of Applied Material Sciences, Centre for Applied Chemistry, Central University of Gujarat Gandhinagar-382030 India
| | - L Raju Chowhan
- School of Applied Material Sciences, Centre for Applied Chemistry, Central University of Gujarat Gandhinagar-382030 India
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8
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Han L, Gan L, Hu X, Li W, Zhu D, Zheng J, Wu Y, Yu Y, Gan Z. Cu(OAc) 2 mediated mild synthesis of 2-aminobenzimidazoles and 2-aminobenzoxazoles. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2065509] [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]
Affiliation(s)
- Lei Han
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - LinLing Gan
- Chongqing Engineering Research Center of Pharmaceutical Sciences, School of Pharmacy, Chongqing Medical and Pharmaceutical College, Chongqing, P. R. China
| | - Xiangnan Hu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Wei Li
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Dali Zhu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Jiecheng Zheng
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Yue Wu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Yu Yu
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
| | - Zongjie Gan
- Department of Medicinal Chemistry, College of Pharmacy, Chongqing Medical University, Chongqing, P. R. China
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9
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Microwave assisted one pot synthesis of 2-alkyl amino benzimidazoles, 2-alkyl amino benzoxazoles and 2-alkyl amino benzthiazoles by using various carbodiimides. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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10
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Kadagathur M, Sigalapalli DK, Patra S, Tangellamudi ND. Microwave-assisted hydrogen peroxide-mediated synthesis of benzoxazoles and related heterocycles via cyclodesulfurization. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.1928217] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Manasa Kadagathur
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Dilep Kumar Sigalapalli
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Sandip Patra
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Neelima D. Tangellamudi
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
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11
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Saranya S, Radhika S, Afsina Abdulla CM, Anilkumar G. Ultrasound irradiation in heterocycle synthesis: An overview. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4261] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Salim Saranya
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
| | - Sankaran Radhika
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
| | | | - Gopinathan Anilkumar
- School of Chemical Sciences Mahatma Gandhi University Kottayam Kerala India
- Advanced Molecular Materials Research Centre (AMMRC) Mahatma Gandhi University Kottayam Kerala India
- Institute for Integrated Programmes and Research in Basic Sciences (IIRBS) Mahatma Gandhi University Kottayam Kerala India
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12
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Kadagathur M, Shaikh AS, Jadhav GS, Sigalapalli DK, Shankaraiah N, Tangellamudi ND. Cyclodesulfurization: An Enabling Protocol for Synthesis of Various Heterocycles. ChemistrySelect 2021. [DOI: 10.1002/slct.202100201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Manasa Kadagathur
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Arbaz Sujat Shaikh
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Govinda Shivaji Jadhav
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Dilep Kumar Sigalapalli
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Nagula Shankaraiah
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Neelima D. Tangellamudi
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
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13
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Tanimori S, Nariki H, Miyamura T, Matsui D, Sonoda M. Iodine-Mediated Facile One-Pot Access to N-Aryl-2-benzoxazolamines. SYNOPEN 2020. [DOI: 10.1055/s-0040-1705982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
AbstractFacile, iodine-mediated access to N-aryl-2-benzoxazolamines has been achieved in a one-pot manner under mild reaction conditions. Reaction of 2-aminophenols and aryl isothiocyanates afforded N-aryl-2-benzoxazolamines in the presence of molecular iodine and pyridine in tetrahydrofuran at room temperature in moderate to excellent yields.
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14
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Pattarawarapan M, Wiriya N, Yimklan S, Wangngae S, Phakhodee W. Zwitterionic Ring-Opened Oxyphosphonium Species from the Ph 3P-I 2 Mediated Reactions of Benzo[ d]oxazol-2(3 H)-ones with Secondary Amines. J Org Chem 2020; 85:6151-6158. [PMID: 32242407 DOI: 10.1021/acs.joc.0c00211] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Instead of the expected substituted 2-aminobenzo[d]oxazoles, relatively stable ring-opened oxyphosphonium betaines were isolated for the first time from the Ph3P-I2-mediated reactions of benzo[d]oxazol-2(3H)-ones with acyclic secondary amines. The structure of one of these compounds was unambiguously confirmed by single-crystal X-ray analysis. Thermolysis of the betaines gave rise to 2-dialkylaminobenzoxazoles with concomitant loss of triphenylphosphine oxide, suggesting their possible role as intermediates in an alternative reaction path.
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Affiliation(s)
- Mookda Pattarawarapan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.,Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Nittaya Wiriya
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Saranphong Yimklan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Sirilak Wangngae
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wong Phakhodee
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.,Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
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15
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Su L, Feng J, Peng T, Wan J, Fan J, Li J, O’Connell J, Lancia DR, Franklin GJ, Liu G. Synthesis of Multifunctional 2-Aminobenzimidazoles on DNA via Iodine-Promoted Cyclization. Org Lett 2020; 22:1290-1294. [DOI: 10.1021/acs.orglett.9b04578] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Liqiang Su
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Jing Feng
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Ting Peng
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Jinqiao Wan
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Jing Fan
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Jin Li
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
| | - Jonathan O’Connell
- FORMA Therapeutics Inc., 500 Arsenal Street, Suite 100, Watertown, Massachusetts 02472, United States
| | - David R. Lancia
- FORMA Therapeutics Inc., 500 Arsenal Street, Suite 100, Watertown, Massachusetts 02472, United States
| | - G. Joseph Franklin
- FORMA Therapeutics Inc., 500 Arsenal Street, Suite 100, Watertown, Massachusetts 02472, United States
| | - Guansai Liu
- Discovery Chemistry Unit, HitGen Inc., Building 6, No. 8 Huigu First East Road, Tianfu International Bio-Town, Shuangliu District, Chengdu 610200, Sichuan, People’s Republic of China
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16
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Liu J, Morgan S, Hoover JM. Cobalt‐Catalyzed Aerobic Oxidative Cyclization of 2‐Aminoanilines with Isonitriles: Facile Access to 2‐Aminobenzimidazoles. ChemCatChem 2020. [DOI: 10.1002/cctc.201902011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jiaqi Liu
- C. Eugene Bennett Department of Chemistry West Virginia University Morgantown WV 26506 USA
| | - Sarah Morgan
- C. Eugene Bennett Department of Chemistry West Virginia University Morgantown WV 26506 USA
| | - Jessica M. Hoover
- C. Eugene Bennett Department of Chemistry West Virginia University Morgantown WV 26506 USA
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17
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Cruz A, Martínez IIP, Ramos-Organillo AA. Methods to Access 2-aminobenzimidazoles of Medicinal Importance. CURR ORG CHEM 2020. [DOI: 10.2174/1385272823666191023150201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
:Benzimidazole (BI) and derivatives are interesting because several of these compounds have been found to have a diversity of biological activities with clinical applications. In view of their importance, the synthesis of BI and its derivatives is still considered as a challenge for synthetic chemists. Examples of compounds used in medicinal chemistry containing BI, as important nucleus, are Astemizole (antihistaminic), Omeprazole (antiulcerative) and Rabendazole (fungicide), some of these compounds have the 2- aminobenzimidazole (2ABI) as base nucleus. The structure of 2ABI derivatives contains a cyclic guanidine moiety, which is interesting because of its free lone pairs, labile hydrogen atoms and planar delocalized structure. The delocalized 10-π electron system and the extension of the electron conjugation with the exocyclic amino group, in 2ABI, making these heterocycles to have amphoteric character. The 2ABI has been used as building blocks for the synthesis of several BI derivatives as medicinally important molecules. On these bases, herein, we present a bibliographic review concerning the recent methodologies used in the synthesis of 2ABIs, including the substituted ones.
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Affiliation(s)
- Alejandro Cruz
- Instituto Politécnico Nacional-UPIBI, Laboratorio de Química Supramolecular y Nanociencias, Av. Acueducto s/n, Barrio la Laguna Ticomán, México, D. F, 07340, Mexico
| | - Itzia I. Padilla Martínez
- Instituto Politécnico Nacional-UPIBI, Laboratorio de Química Supramolecular y Nanociencias, Av. Acueducto s/n, Barrio la Laguna Ticomán, México, D. F, 07340, Mexico
| | - Angel A. Ramos-Organillo
- Facultad de Ciencias Químicas, Universidad de Colima, Km 9 Carr. Colima- Coquimatlán, 28400, Coquimatlán, Colima, Mexico
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18
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Zhang J, Chen L, Dong Y, Yang J, Wu Y. A Cu 2O/TBAB-promoted approach to synthesize heteroaromatic 2-amines via one-pot cyclization of aryl isothiocyanates with ortho-substituted amines in water. Org Biomol Chem 2020; 18:7425-7430. [PMID: 32936165 DOI: 10.1039/d0ob01431a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach to synthesize heteroaromatic 2-amines from one-pot desulfurization/dehydrogenative cyclization of aryl isothiocyanates with ortho-substituted amines in water was developed. This approach tolerated a wide range of functional groups on the aromatic ring, providing a practical and environment-friendly process to synthesize heteroaromatic 2-amines in moderate to excellent yields. A plausible mechanism was proposed and the role of TBAB and Cu2O in the present strategy was suggested with the help of ESI mass spectrometry.
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Affiliation(s)
- Jinli Zhang
- Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou, 450052, P.R. China. and College of Chemistry, Green Catalytic Center, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Ling Chen
- Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou, 450052, P.R. China.
| | - Yibo Dong
- Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou, 450052, P.R. China.
| | - Jinchen Yang
- College of Chemistry, Green Catalytic Center, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Yangjie Wu
- Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou, 450052, P.R. China. and College of Chemistry, Green Catalytic Center, Zhengzhou University, Zhengzhou 450001, P. R. China
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19
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Sang W, Gavi AJ, Yu BY, Cheng H, Yuan Y, Wu Y, Lommens P, Chen C, Verpoort F. Palladium-Catalyzed Ligand-Free C-N Coupling Reactions: Selective Diheteroarylation of Amines with 2-Halobenzimidazoles. Chem Asian J 2019; 15:129-135. [PMID: 31762212 DOI: 10.1002/asia.201901465] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 11/15/2019] [Indexed: 12/14/2022]
Abstract
2-Aminobenzimidazoles are widely present in a number of bioactive molecules. Generally, the preparation of these molecules could be realized by the mono-substitution of 2-halobenzimidazoles with amines. However, rare examples were reported for the di-substituted products and the selectivity of mono- vs. di-substitution was relatively low. Considering the potential values of the di-substituted products, we accomplished the first selective diheteroarylation of amines with 2-halobenzimidazoles. Notably, this Pd-catalyzed transformation was realized under ligand-free conditions. Accordingly, numerous target products were efficiently produced from various aromatic or aliphatic amines and 2-halobenzimidazoles. It was worth noting that two representative products were further confirmed by X-ray crystallography. More significantly, this catalytic process could be applied to the synthesis and discovery of new bioactive compounds, which demonstrated the synthetic usefulness of this newly developed approach.
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Affiliation(s)
- Wei Sang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P. R. China.,School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P. R. China
| | - Ayao Jean Gavi
- Odisee/KU Leuven Technology Campus, Gebroeders de Smetstraat 1, 9000, Ghent, Belgium
| | - Bao-Yi Yu
- Key Laboratory of Urban Agriculture (North China), Ministry of Agriculture, Beijing University of Agriculture, Beinong Road 7, Beijing, 102206, P. R. China
| | - Hua Cheng
- Department of Chemical Engineering and Food Science, Hubei University of Arts and Science, 296 Longzhong Road, Xiangyang, 441053, P. R. China
| | - Ye Yuan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P. R. China
| | - Yuan Wu
- College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, 430079, P. R. China
| | - Petra Lommens
- Odisee/KU Leuven Technology Campus, Gebroeders de Smetstraat 1, 9000, Ghent, Belgium
| | - Cheng Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P. R. China
| | - Francis Verpoort
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, P. R. China.,National Research Tomsk Polytechnic University, Tomsk, 634050, Russian Federation.,Ghent University Global Campus, 119 Songdomunhwa-Ro, Yeonsu-Gu, Incheon, 21985, Korea
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20
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Pattarawarapan M, Yamano D, Wiriya N, Phakhodee W. Metal-Free Synthesis of 2- N, N-Dialkylaminobenzoxazoles Using Tertiary Amines as the Nitrogen Source. J Org Chem 2019; 84:6516-6523. [PMID: 31017442 DOI: 10.1021/acs.joc.9b00797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The unprecedented reaction of tertiary amines with 2(3 H)-benzoxazolones has been investigated. In the presence of the Ph3P-I2 reagent system, the reaction of both acyclic and cyclic aliphatic tertiary amines led to the formation of 2- N, N-dialkylaminobenzoxazoles with the selective cleavage of an alkyl group. Especially, N-(2-iodoethyl)piperazinyl derivatives were rapidly produced in good yields when using DABCO as the nitrogen source. Only in the cases when the nucleophilicity of the substrates exceeds that of the amine, competitive self-condensation of benzoxazolones then proceeds preferentially. 31P{1H}-NMR study suggested the involvement of an aryloxyphosphonium intermediate and/or possibly 2-iodobenzoxazole which activates the C-2 position of benzoxazolones toward nucleophilic aromatic substitution.
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Affiliation(s)
- Mookda Pattarawarapan
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
- Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Dolnapa Yamano
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Nitaya Wiriya
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Wong Phakhodee
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
- Research Center on Chemistry for Development of Health Promoting Products from Northern Resources, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
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Wang Z, Zhao Q, Hou J, Yu W, Chang J. Iodine-mediated direct synthesis of multifunctional 2-aminobenzimidazoles from N-substituted o-diaminoarenes and isothiocyanates. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.03.049] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Murata Y, Matsumoto N, Miyata M, Kitamura Y, Kakusawa N, Matsumura M, Yasuike S. One-pot reaction for the synthesis of N -substituted 2-aminobenzoxazoles using triphenylbismuth dichloride as cyclodesulfurization reagent. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.01.041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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