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Romanov AR, Kondrashov EV, Zinchenko SV. Synthesis of 5-(trifluoroacetyl)imidazoles from Bromoenones and Benzimidamides via Aza-Michael Initiated Ring Closure Reaction. Curr Org Synth 2024; 21:195-209. [PMID: 37078355 DOI: 10.2174/1570179420666230420100643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 02/08/2023] [Accepted: 02/21/2023] [Indexed: 04/21/2023]
Abstract
INTRODUCTION A simple method for the preparation of 5-(trifluoroacetyl)imidazoles was elaborated. METHODS The reaction of trifluoromethyl(α-bromoalkenyl)ketones with benzimidamides was employed to afford the target heterocycles in good yields. RESULTS The assembly of imidazole core proceeds via aza-Michael adduct formation followed by intramolecular nucleophilic substitution and spontaneous aromatization as an oxidation sequence. CONCLUSION The yields of target imidazoles can be improved by the use of soft oxidizing agents.
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Affiliation(s)
- Alexey R Romanov
- The Laboratory of Halogen Organic Compound, A. E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk, 664033, Russia
| | - Evgeniy V Kondrashov
- The Laboratory of Halogen Organic Compound, A. E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk, 664033, Russia
| | - Sergey V Zinchenko
- The Laboratory of Halogen Organic Compound, A. E. Favorsky Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, Irkutsk, 664033, Russia
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2
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Xu H, Chen H, Hu X, Xuan G, Li P, Zhang Z. Synthesis of Fully Substituted 5-( o-Hydroxybenzoyl)imidazoles via Iodine-Promoted Domino Reaction of Aurones with Amidines. J Org Chem 2022; 87:16204-16212. [PMID: 36414000 DOI: 10.1021/acs.joc.2c01680] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An iodine-promoted domino reaction of aurones with amidines has been successfully explored. The reaction proceeds in a consecutive manner containing Michael addition, iodination, cyclization from intramolecular nucleophilic substitution, and dehydrogenative aromatization from spiro ring opening. Following this novel strategy, a variety of 1,2,4-trisubstituted 5-(o-hydroxybenzoyl)imidazoles were efficiently synthesized in moderate to good yields from readily available starting materials. A plausible mechanism has been proposed.
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Affiliation(s)
- Hui Xu
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
| | - Hong Chen
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
| | - Xiao Hu
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
| | - Guang Xuan
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
| | - Pinhua Li
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
| | - Ze Zhang
- Anhui Province Key Laboratory of Functional Coordinated Complexes for Materials Chemistry Application, and School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China
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3
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Zhang S, Xu G, Yan H, Wu Q, Meng J, Duan J, Guo K. Electrooxidative [3 + 2] annulation of amidines with alkenes for the synthesis of spiroimidazolines. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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4
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Yongxin C, Xin G, Yafeng L, Xueying Y, Baohua C. Synthesis of 1,2,4-Triazolo[4,3- a]pyridines by I 2-Catalyzed Oxidative Coupling of 2-Aminopyridines with N-Tosylhydrazones. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202205040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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5
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Gao Q, Wu M, Zhang L, Xu P, Wang H, Sun Z, Fang L, Duan Y, Bai S, Zhou X, Han M, Zhang J, Lv J. Open-Air Dual-Diamination of Aromatic Aldehydes: Direct Synthesis of Azolo-Fused 1,3,5-Triazines Facilitated by Ammonium Iodide. J Org Chem 2021; 86:17265-17273. [PMID: 34792363 DOI: 10.1021/acs.joc.1c02362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A new and practical protocol for the synthesis of medicinally privileged azolo[1,3,5]triazines by simply heating under air has been presented. The in situ generated N-azolo amidines from commercially available aromatic aldehydes and 3-aminoazoles with ammonium iodide undergo the second diamination to accomplish the [3 + 1 + 1 + 1] heteroannulation reaction. This convenient process is appreciated by high efficiency, broad substrate scope, gram-scale synthesis, and operational simplicity under reagent-free conditions.
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Affiliation(s)
- Qinghe Gao
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Manman Wu
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Le Zhang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Pengju Xu
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - He Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Zhenhua Sun
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Lizhen Fang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Yingchao Duan
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Suping Bai
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Xiangyu Zhou
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Mingxin Han
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Jixia Zhang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
| | - Jieli Lv
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P. R. China
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6
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Bagdi AK, Pattanayak P, Paul S, Mitra M, Choudhuri T, Sheikh AS. Application of Conjugated Carbonyls in the Synthesis of Heterocycles via Oxidative Cycloaddition and Cyclization Reactions. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000970] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Avik Kumar Bagdi
- Department of Chemistry University of Kalyani Kalyani 741235 India
| | | | - Suvam Paul
- Department of Chemistry University of Kalyani Kalyani 741235 India
| | - Mousree Mitra
- Department of Chemistry University of Kalyani Kalyani 741235 India
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7
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Liu Z, Zhang YS, Wei Y, Shi M. Metal-Free Synthesis of Polysubstituted Imidazolinone Through Cyclization of Amidines with 2-Substituted Acrylates. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Zhen Liu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals; School of Chemistry & Molecular Engineering; East China University of Science and Technology; Meilong Road No. 130 200237 Shanghai China
| | - Yan-Shun Zhang
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; University of Chinese Academy of Sciences; 345 Lingling Road 200032 Shanghai China
| | - Yin Wei
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; University of Chinese Academy of Sciences; 345 Lingling Road 200032 Shanghai China
| | - Min Shi
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals; School of Chemistry & Molecular Engineering; East China University of Science and Technology; Meilong Road No. 130 200237 Shanghai China
- State Key Laboratory of Organometallic Chemistry; Center for Excellence in Molecular Synthesis; University of Chinese Academy of Sciences; 345 Lingling Road 200032 Shanghai China
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8
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Tian Y, Qin M, Yang X, Zhang X, Liu Y, Guo X, Chen B. Acid-catalyzed synthesis of imidazole derivatives via N-phenylbenzimidamides and sulfoxonium ylides cyclization. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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9
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Wu P, Zhang X, Chen B. Direct synthesis of 2,4,5-trisubstituted imidazoles and di/tri-substituted pyrimidines via cycloadditions of α,β-unsaturated ketones/aldehydes and N′-hydroxyl imidamides. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.03.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Liu Y, Yuan X, Guo X, Zhang X, Chen B. Efficient 2-aryl benzothiazole formation from acetophenones, anilines, and elemental sulfur by iodine-catalyzed oxidative C(CO)-C(alkyl) bond cleavage. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.047] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Zhang X, Wang P, Han J, Guo X, Chen B. CuBr-Catalyzed Synthesis of Indolizines from Pyridine, Acetophenone and Chalcone under Solvent-Free Conditions. ChemistrySelect 2018. [DOI: 10.1002/slct.201800263] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xueguo Zhang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Peigen Wang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Jianwei Han
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Xin Guo
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
| | - Baohua Chen
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Lanzhou 730000 P. R. of China
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12
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Guo X, Yang X, Qin M, Liu Y, Yang Y, Chen B. Copper-Catalyzed Cyclization of Ketoxime Carboxylates and N
-Aryl Glycine Esters for the Synthesis of Pyridines. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700703] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Xin Guo
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
| | - Xueying Yang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
| | - Mingda Qin
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
| | - Yafeng Liu
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
| | - Yuting Yang
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
| | - Baohua Chen
- State Key Laboratory of Applied Organic Chemistry; Lanzhou University; Lanzhou 730000 China), E-mai
- Zhongwei High-tech Institute of Lanzhou University; Zhongwei Ningxia 755500 China
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13
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Xu H, Chen K, Liu HW, Wang GW. Solvent-free N-iodosuccinimide-promoted synthesis of spiroimidazolines from alkenes and amidines under ball-milling conditions. Org Chem Front 2018. [DOI: 10.1039/c8qo00723c] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
An environmentally benign and N-iodosuccinimide-promoted intermolecular cyclization between alkenes and amidines has been demonstrated under solvent-free ball-milling conditions, affording a variety of spiroimidazolines with remarkable functional group tolerance and good to excellent yields.
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Affiliation(s)
- Hui Xu
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
| | - Kuan Chen
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
| | - Hong-Wei Liu
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
| | - Guan-Wu Wang
- CAS Key Laboratory of Soft Matter Chemistry
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
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14
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Wang C, Lai J, Chen C, Li X, Cao H. Ag-Catalyzed Tandem Three-Component Reaction toward the Synthesis of Multisubstituted Imidazoles. J Org Chem 2017; 82:13740-13745. [DOI: 10.1021/acs.joc.7b02612] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Changcheng Wang
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. of China
| | - Jialin Lai
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. of China
| | - Cantao Chen
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. of China
| | - Xuechen Li
- Department
of Chemistry, State Key Lab of Synthetic Chemistry, The University of Hong Kong, Pokfulam, Hong Kong SAR, China
| | - Hua Cao
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. of China
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15
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Hu Z, Dong J, Xu X. Silver-Catalyzed [3+2] Cycloaddition of Azomethine Ylides with Isocyanides for Imidazole Synthesis. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700447] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Zhongyan Hu
- Jilin Province Key Laboratory of Organic Functional Molecular Design and Synthesis, Department of Chemistry; Northeast Normal University; Changchun 130024 People's Republic of China
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Institute of Molecular and Nano Science; Shandong Normal University; Jinan 250014 People's Republic of China
| | - Jinhuan Dong
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Institute of Molecular and Nano Science; Shandong Normal University; Jinan 250014 People's Republic of China
| | - Xianxiu Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design and Synthesis, Department of Chemistry; Northeast Normal University; Changchun 130024 People's Republic of China
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Institute of Molecular and Nano Science; Shandong Normal University; Jinan 250014 People's Republic of China
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16
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Wang QD, Yang JM, Zhou B, Fang D, Ren J, Zeng BB. Highly Regioselective Debus-Radziszewski Reaction of C-3 Indole-Substituted 1,2-Diketones: Facile Synthesis of 3-(1,2,4-Triaryl-1 H
-imidazol-5-yl)-indoles. ChemistrySelect 2017. [DOI: 10.1002/slct.201700612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Qing-Dong Wang
- School of Pharmacy; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 PR China
- School of Pharmacy; Yancheng Teachers University, Yancheng; Jiangsu 224051 PR China
| | - Jin-Ming Yang
- School of Pharmacy; Yancheng Teachers University, Yancheng; Jiangsu 224051 PR China
| | - Bin Zhou
- School of Pharmacy; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 PR China
| | - Dong Fang
- School of Pharmacy; Yancheng Teachers University, Yancheng; Jiangsu 224051 PR China
| | - Jiangmeng Ren
- School of Pharmacy; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 PR China
| | - Bu-Bing Zeng
- School of Pharmacy; East China University of Science and Technology; 130 Meilong Road Shanghai 200237 PR China
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17
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Wang J, Zhang FD, Tang D, Wu P, Zhang XG, Chen BH. I2/TBPB mediated oxidative reaction of aryl acetaldehydes with amidines: synthesis of 1,2,5-triaryl-1H-imidazoles. RSC Adv 2017. [DOI: 10.1039/c7ra01966a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
A direct method for the synthesis of 1,2,5-triaryl-1H-imidazoles was achieved from acetaldehydes with amidines catalyzed by I2. Various substituted groups can be employed, and this reaction proceeds smoothly in moderate to good yields.
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Affiliation(s)
- Jing Wang
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University Gansu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Lanzhou 730000
- People's Republic of China
| | - Fang-Dong Zhang
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University Gansu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Lanzhou 730000
- People's Republic of China
| | - Dong Tang
- Department of Chemistry
- Lishui University
- Lishui 323000
- People's Republic of China
| | - Ping Wu
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University Gansu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Lanzhou 730000
- People's Republic of China
| | - Xue-Guo Zhang
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University Gansu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Lanzhou 730000
- People's Republic of China
| | - Bao-Hua Chen
- State Key Laboratory of Applied Organic Chemistry
- Lanzhou University Gansu
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Lanzhou 730000
- People's Republic of China
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18
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Meng X, Bi X, Wang Y, Chen G, Chen B, Jing Z, Zhao P. Heterogeneous selective synthesis of 1,2-dihydro-1,3,5-triazines from alcohols and amidines via Cu/OMS-2-catalyzed multistep oxidation. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2016.10.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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19
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Zhou X, Ma H, Shi C, Zhang Y, Liu X, Huang G. Facile Synthesis of Polysubstituted Imidazoles through CBr4-Mediated Tandem Cyclization of Amidines with 1,3-Dicarbonyl Compounds or Ketones. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601428] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xiaoqiang Zhou
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
| | - Haojie Ma
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
| | - Chong Shi
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
| | - Yixin Zhang
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
| | - XingXing Liu
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
| | - Guosheng Huang
- State Key Laboratory of Applied Organic Chemistry; Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province; Department of Chemistry; Lanzhou University; 730000 Lanzhou China
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20
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Chiba S. Copper-catalyzed oxidative molecular transformation of amidines for synthesis of nitrogen heterocycles. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Yugandar S, Konda S, Parameshwarappa G, Ila H. One-Pot Synthesis of 2,4,5-Trisubstituted Imidazoles via [2 + 2 + 1] Cycloannulation of 1,3-Bishet(aryl)-monothio-1,3-diketones, α-Substituted Methylamines and Sodium Nitrite through α-Nitrosation of Enaminones. J Org Chem 2016; 81:5606-22. [PMID: 27194455 DOI: 10.1021/acs.joc.6b00938] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient one-pot synthesis of a series of diversely functionalized trisubstituted 4(5)het(aroyl)-2,5(4)-het(aryl)/alkylimidazoles from readily available 1,3-bishet(aryl)monothio-1,3-diketones has been reported. This novel sequential one-pot, three step protocol, wherein three new carbon nitrogen bonds are formed in contiguous fashion, involves in situ generation of enaminones by reaction of monothio-1,3-diketones with α-substituted methylamines, followed by their α-nitrosation with sodium nitrite and subsequent base mediated intramolecular heterocyclization of the resulting α-hydroxyiminoimines to trisubstituted imidazoles in high yields under mild conditions. These newly prepared 4(5)-het(aroyl)-5(4)-het(aryl)/alkylimidazoles are shown to exist as tautomeric mixture, however, their subsequent alkylation with methyl iodide in the presence of potassium carbonate affords 1-N-methy-2,5-bishet(aryl)-4-het(aroyl)imidazoles in highly regioselective fashion in most of the cases. Synthesis of few 4(5)-(2-hydroxyphenyl)-2,5(4)-substituted imidazoles, which are known to be good coordinating ligands, has also been reported. A probable mechanism for the formation of these imidazoles from hydroxyiminoimine intermediates has also been suggested.
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Affiliation(s)
- S Yugandar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore-560064, India
| | - S Konda
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore-560064, India
| | - G Parameshwarappa
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore-560064, India
| | - H Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur, Bangalore-560064, India
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