51
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Jana S, Chakraborty A, Shirinian VZ, Hajra A. Synthesis of Benzo[4,5]imidazo[2,1-b
]thiazole by Copper(II)-Catalyzed Thioamination of Nitroalkene with 1H
-Benzo[d
]imidazole-2-thiol. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800393] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sourav Jana
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan 731235 India
| | | | - Valerii Z. Shirinian
- N. D. Zelinsky Institute of Organic Chemistry RAS; 47 Leninsky prosp. 119991 Moscow Russian Federation
| | - Alakananda Hajra
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan 731235 India
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52
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Dey A, Singsardar M, Sarkar R, Hajra A. Environment-Friendly Protocol for the Chlorination of Imidazoheterocycles by Chloramine-T. ACS OMEGA 2018; 3:3513-3521. [PMID: 31458602 PMCID: PMC6641228 DOI: 10.1021/acsomega.7b01844] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/15/2018] [Indexed: 05/27/2023]
Abstract
An environment-friendly method for the chlorination of imidazoheterocycles has been developed using chloramine-T, a novel chlorinating reagent. A bunch of C-3 chloro-substituted imidazo[1,2-a]pyridines with variety of functionalities have been synthesized in good yields under neat condition at room temperature within very short time. This chlorination process is also applicable to imidazo[2,1-b]thiazole scaffolds. The present methodology is relevant to gram-scale synthesis. The major advantages of this system such as wide applicability, easy availability of reactants, open-air and metal- and solvent-free reaction conditions, no need of work-up, and simple purification technique represent a green synthetic protocol.
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53
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Li J, Tang J, Wu Y, He Q, Yu Y. Transition-metal-free regioselective C-H halogenation of imidazo[1,2- a]pyridines: sodium chlorite/bromite as the halogen source. RSC Adv 2018; 8:5058-5062. [PMID: 35539548 PMCID: PMC9078039 DOI: 10.1039/c7ra12100h] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 01/23/2018] [Indexed: 12/11/2022] Open
Abstract
A facile transition-metal-free regioselective halogenation of imidazo[1,2-a]pyridines using sodium chlorite/bromite as the halogen source is presented. The reaction has provided an efficient method for the formation of C-Cl or C-Br bonds to synthesize 3-chloro or 3-bromo-imidazo[1,2-a]pyridines which were then efficiently transformed into imidazo[1,2-a]pyridine core π-systems by Suzuki-Miyaura reactions.
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Affiliation(s)
- Junxuan Li
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Jiayi Tang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Yuanheng Wu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Qiuxing He
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Yue Yu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
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54
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Ramya PS, Angapelly S, Digwal CS, Yadav U, Babu BN, Kamal A. An efficient RuCl 3 ·H 2 O/I 2 catalytic system: A facile access to 3-aroylimidazo[1,2- a ]pyridines from 2-aminopyridines and chalcones. JOURNAL OF SAUDI CHEMICAL SOCIETY 2018. [DOI: 10.1016/j.jscs.2017.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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55
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Cui Z, Zhu B, Li X, Cao H. Access to sulfonylated furans or imidazo[1,2-a]pyridines via a metal-free three-component, domino reaction. Org Chem Front 2018. [DOI: 10.1039/c8qo00443a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An efficient three-component reaction for the synthesis of sulfonylated furans or imidazo[1,2-a]pyridines has been developed.
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Affiliation(s)
- Zhiming Cui
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan 528458
- P. R. China
| | - Baofu Zhu
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan 528458
- P. R. China
| | - Xuechen Li
- Department of Chemistry
- State Key Lab of Synthetic Chemistry
- The University of Hong Kong
- China
| | - Hua Cao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan 528458
- P. R. China
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56
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Ojha NK, Zyryanov GV, Majee A, Charushin VN, Chupakhin ON, Santra S. Copper nanoparticles as inexpensive and efficient catalyst: A valuable contribution in organic synthesis. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.10.004] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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57
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Metal-Free Synthesis of Indoles from Arylhydrazines and Nitroalkenes at Room Temperature. ChemistrySelect 2017. [DOI: 10.1002/slct.201701964] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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58
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Bhagat SB, Telvekar VN. NBS mediated protocol for the synthesis of N -bridged fused heterocycles in water. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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59
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Mondal S, Samanta S, Singsardar M, Hajra A. Aminomethylation of Imidazoheterocycles with Morpholine. Org Lett 2017; 19:3751-3754. [DOI: 10.1021/acs.orglett.7b01594] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Susmita Mondal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Sadhanendu Samanta
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Mukta Singsardar
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
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60
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An efficient access to 2,3-diarylimidazo[1,2-a]pyridines via silver(I)-catalyzed C-H bond functionalization. MONATSHEFTE FUR CHEMIE 2017. [DOI: 10.1007/s00706-017-1950-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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61
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Dwivedi V, Kumar R, Sharma K, Sridhar B, Reddy MS. Copper-Promoted Regioselective Intermolecular Diamination of Ynamides: Synthesis of Imidazo[1,2- a]pyridines. ACS OMEGA 2017; 2:2770-2777. [PMID: 31457615 PMCID: PMC6641143 DOI: 10.1021/acsomega.7b00426] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/05/2017] [Indexed: 06/10/2023]
Abstract
A facile access to 3-heterosubstituted (3-oxazolidinonyl/indolyl/phenoxy) imidazo[1,2-a]pyridines from readily available 2-aminopyridines and electron-rich (internally activated) alkynes like ynamides/ynamines/ynol ethers is achieved via Cu(OTf)2-mediated intermolecular diamination under aerobic conditions. The reaction is highly regioselective, owing to internal electron bias, and thus led to a single regioisomer with heterosubstitution at C3.
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Affiliation(s)
- Vikas Dwivedi
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
| | - Ravi Kumar
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- Academy
of Scientific and Innovative Research, New Delhi 110001, India
| | - Kavita Sharma
- National
Institute of Pharmaceutical Education and Research, Raebareli 229010, India
| | - Balasubramanian Sridhar
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
| | - Maddi Sridhar Reddy
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
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62
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Chachignon H, Cahard D. Interrupted reduction of CF 3 SO 2 Cl using tricyclohexylphosphine allows for electrophilic trifluoromethylsulfinylation. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2016.11.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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63
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Synthesis of functionalyzed imidazo[1,2-a]pyridines via domino A3-coupling/cycloisomerization approach. Chem Heterocycl Compd (N Y) 2017. [DOI: 10.1007/s10593-017-2066-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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64
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Associative Covalent Relay: An Oxadiazolone Strategy for Rhodium(III)-Catalyzed Synthesis of Primary Pyridinylamines. Angew Chem Int Ed Engl 2017; 56:5222-5226. [DOI: 10.1002/anie.201700320] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Indexed: 12/31/2022]
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65
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Yu X, Chen K, Wang Q, Guo S, Zha S, Zhu J. Associative Covalent Relay: An Oxadiazolone Strategy for Rhodium(III)-Catalyzed Synthesis of Primary Pyridinylamines. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700320] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Xiaolong Yu
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
| | - Kehao Chen
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
| | - Qi Wang
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
| | - Shan Guo
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
| | - Shanke Zha
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
| | - Jin Zhu
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering; State Key Laboratory of Coordination Chemistry; Nanjing National Laboratory of Microstructures; Collaborative Innovation Center of Chemistry for Life Sciences; Nanjing University; Nanjing 210093 China
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66
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Ravi C, Adimurthy S. Synthesis of Imidazo[1,2‐a]pyridines: C‐H Functionalization in the Direction of C‐S Bond Formation. CHEM REC 2017; 17:1019-1038. [DOI: 10.1002/tcr.201600146] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 02/27/2017] [Indexed: 01/22/2023]
Affiliation(s)
- Chitrakar Ravi
- Natural Products & Green ChemistryCSIR-Central Salt & Marine Chemicals Research Institute G.B. Marg, Bhavnagar-364002 Gujarat India
| | - Subbarayappa Adimurthy
- Natural Products & Green ChemistryCSIR-Central Salt & Marine Chemicals Research Institute G.B. Marg, Bhavnagar-364002 Gujarat India
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67
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Roslan II, Chuah GK, Jaenicke S. Switching of Regioselectivity in a Perfluorohexyl Iodide Mediated Synthesis of Phenylimidazo[1,2-a]pyridines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601586] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Irwan Iskandar Roslan
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
| | - Gaik-Khuan Chuah
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
| | - Stephan Jaenicke
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
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68
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Silver-catalyzed highly efficient synthesis of pyrido[1,2- a ]pyrimidin-4-ones from 2-aminopyridines and alkynoates. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.11.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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69
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Samanta S, Mondal S, Santra S, Kibriya G, Hajra A. FeCl 3-Catalyzed Cross-Dehydrogenative Coupling between Imidazoheterocycles and Oxoaldehydes. J Org Chem 2016; 81:10088-10093. [PMID: 27696879 DOI: 10.1021/acs.joc.6b02091] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An Fe(III)-catalyzed efficient dicarbonylation of imidazoheterocycles has been developed through cross-dehydrogenative coupling between imidazoheterocycles and oxoaldehydes under ambient air in high yields. The present protocol is also applicable to indolizines. Imidazopyridine produced bisimidazopyridine with arylaldehyde. Experimental results suggest that the reactions proceed through the nonradical pathway.
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Affiliation(s)
- Sadhanendu Samanta
- Department of Chemistry, Visva-Bharati (A Central University) , Santiniketan 731235, India
| | - Susmita Mondal
- Department of Chemistry, Visva-Bharati (A Central University) , Santiniketan 731235, India
| | - Sougata Santra
- Department of Organic & Biomolecular Chemistry, Chemical Engineering Institute, Ural Federal University , 19 Mira Str., Yekaterinburg, 620002, Russian Federation
| | - Golam Kibriya
- Department of Chemistry, Visva-Bharati (A Central University) , Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University) , Santiniketan 731235, India
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70
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Roslan II, Ng KH, Wu JE, Chuah GK, Jaenicke S. Synthesis of Disubstituted 3-Phenylimidazo[1,2-a]pyridines via a 2-Aminopyridine/CBrCl 3 α-Bromination Shuttle. J Org Chem 2016; 81:9167-9174. [PMID: 27606896 DOI: 10.1021/acs.joc.6b01714] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A versatile protocol for the synthesis of disubstituted 3-phenylimidazo[1,2-a]pyridines by coupling 2-aminopyridine with phenylacetophenones, phenylacetones, or β-tetralone has been developed. Isolated yields of up to 97% were obtained at 80 °C within 5 h. The 2-aminopyridine/CBrCl3 system acts as an α-bromination shuttle by transferring Br from CBrCl3 to the α-carbon of the carbonyl moiety. This triggers a series of steps with double C-N/C-N bond formation to the final product. The distinct advantages of this protocol include the use of commercially available inexpensive substrates, simplicity of a metal-free one-pot synthesis, and ease of scale-up to multigram quantities.
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Affiliation(s)
- Irwan Iskandar Roslan
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, Singapore 117543
| | - Kian-Hong Ng
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, Singapore 117543
| | - Ji'-En Wu
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, Singapore 117543
| | - Gaik-Khuan Chuah
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, Singapore 117543
| | - Stephan Jaenicke
- Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore, Singapore 117543
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71
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Iodine–ammonium acetate promoted reaction between 2-aminopyridine and aryl methyl ketones: a novel approach towards the synthesis of 2-arylimidazo[1,2-a]pyridines. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.058] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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72
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Liu Y, Zhan H, Yao K, Mai Y, Wang E, He J, Guo P. Magnetic Supported Copper Nanoparticles: An Efficient Heterogeneous Catalyst for the Synthesis of 1,2-Diketones by Cross-Coupling Reaction of Imidazo[1,2-a]pyridines with Methyl Ketones. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yi Liu
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Haiying Zhan
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Kefan Yao
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Yingying Mai
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Enmin Wang
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Juan He
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
| | - Pengfeng Guo
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; 528458 Zhongshan P. R. China
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73
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Lu S, Zhu X, Li K, Guo YJ, Wang MD, Zhao XM, Hao XQ, Song MP. Reactivity of p-Toluenesulfonylmethyl Isocyanide: Iron-Involved C–H Tosylmethylation of Imidazopyridines in Nontoxic Media. J Org Chem 2016; 81:8370-7. [DOI: 10.1021/acs.joc.6b01552] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shuai Lu
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xinju Zhu
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Ke Li
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Yu-Jing Guo
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Meng-Dan Wang
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xue-Mei Zhao
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Xin-Qi Hao
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
| | - Mao-Ping Song
- College of Chemistry and
Molecular Engineering, Henan Key Laboratory of Chemical Biology and
Organic Chemisry, Zhengzhou University, No. 100 of Science Road, Zhengzhou, Henan 450001, P. R. China
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74
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Patel OPS, Anand D, Maurya RK, Yadav PP. H2O2/DMSO-Promoted Regioselective Synthesis of 3,3'-Bisimidazopyridinylmethanes via Intermolecular Oxidative C(sp(2))-H Bond Activation of Imidazoheterocycles. J Org Chem 2016; 81:7626-34. [PMID: 27487477 DOI: 10.1021/acs.joc.6b01355] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In the past decade, metal-free approaches for C-C bond formation have attracted a great deal of attention due to their ease of use and low cost. This report represents a novel and metal-free synthesis of 3,3'-bisimidazopyridinylmethanes via intermolecular oxidative C(sp(2))-H bond functionalization of imidazo[1,2-a]pyridines with dimethyl sulfoxide as the carbon synthon (CH2) using H2O2 as a mild oxidant under air. A library of 3,3'-bis(2-arylimidazo[1,2-a]pyridin-3-yl)methanes has been achieved in good to excellent yields. The present methodology has been successfully applied to imidazo[2,1-b]thiazoles and imidazo[2,1-b]benzothiazoles. Furthermore, the current approach was also extended for the synthesis of unsymmetrical 3,3'-bisimidazopyridinylmethanes under optimized reaction conditions. A mechanistic pathway is proposed on the basis of experiments with radical scavengers and DMSO-d6 and ESI-MS observations.
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Affiliation(s)
- Om P S Patel
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute , BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Devireddy Anand
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute , BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Rahul K Maurya
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute , BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
| | - Prem P Yadav
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute , BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India
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75
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Conversion of aziridines to oxazolidines through geminal difunctionalization of vinyl arenes or by tandem ring-opening/closing reaction of aziridine itself. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.119] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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76
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Lei S, Mai Y, Yan C, Mao J, Cao H. A Carbonylation Approach Toward Activation of Csp2-H and Csp3-H Bonds: Cu-Catalyzed Regioselective Cross Coupling of Imidazo[1,2-a]pyridines with Methyl Hetarenes. Org Lett 2016; 18:3582-5. [DOI: 10.1021/acs.orglett.6b01588] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Sai Lei
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Yingying Mai
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Caijuan Yan
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, China
| | - Jianwen Mao
- Guangdong
Provincial Key Laboratory of Pharmaceutical Bioactive Substances and
School of Basic Medicine, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Hua Cao
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, China
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77
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Iodine-promoted oxidative coupling reaction: a simple and efficient process to access imidazo[1,2-a]pyridines from 2-aminopyridines and chalcones. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.052] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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78
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Bagdi AK, Hajra A. Design, Synthesis, and Functionalization of Imidazoheterocycles. CHEM REC 2016; 16:1868-85. [DOI: 10.1002/tcr.201600057] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Indexed: 12/12/2022]
Affiliation(s)
- Avik Kumar Bagdi
- Department of Chemistry; Trivenidevi Bhalotia College; Raniganj- 713347 India
| | - Alakananda Hajra
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan- 731235 India
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79
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Samanta S, Jana S, Mondal S, Monir K, Chandra SK, Hajra A. Switching the regioselectivity in the copper-catalyzed synthesis of iodoimidazo[1,2-a]pyridines. Org Biomol Chem 2016; 14:5073-8. [PMID: 27182027 DOI: 10.1039/c6ob00656f] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A unique copper-catalyzed binucleophilic switching of 2-aminopyridine has been developed for the regioselective synthesis of 2- and 3-iodoimidazo[1,2-a]pyridines using alkenes/alkynes as coupling partners in the presence of molecular iodine under aerobic reaction conditions. This method was also applied to the synthesis of 2-iodo-3-phenylbenzo[d]imidazo[2,1-b]thiazoles. This protocol offers an easy route towards the synthesis of 2,3-diarylimidazo[1,2-a]pyridines.
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Affiliation(s)
- Sadhanendu Samanta
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
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80
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Ansari AJ, Sharma S, Pathare RS, Gopal K, Sawant DM, Pardasani RT. Solvent-free Multicomponent Synthesis of Biologically-active Fused-imidazo Heterocycles Catalyzed by Reusable Yb(OTf)3Under Microwave Irradiation. ChemistrySelect 2016. [DOI: 10.1002/slct.201600241] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Arshad J. Ansari
- Department of Pharmacy; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
| | - Shivani Sharma
- Department of Chemistry; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
| | - Ramdas S. Pathare
- Department of Chemistry; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
| | - Kandasamy Gopal
- Department of Chemistry; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
| | - Devesh M. Sawant
- Department of Pharmacy; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
| | - R. T. Pardasani
- Department of Chemistry; Central University of Rajasthan; Bandarsindri, Kishangarh, Ajmer - 305 817 Rajasthan India
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81
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Chaudhary V, Venghateri JB, Dhaked HPS, Bhoyar AS, Guchhait SK, Panda D. Novel Combretastatin-2-aminoimidazole Analogues as Potent Tubulin Assembly Inhibitors: Exploration of Unique Pharmacophoric Impact of Bridging Skeleton and Aryl Moiety. J Med Chem 2016; 59:3439-51. [DOI: 10.1021/acs.jmedchem.6b00101] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Vikas Chaudhary
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Jubina B. Venghateri
- IITB-Monash Research
Academy, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Hemendra P. S. Dhaked
- Department of Biosciences
and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Anil S. Bhoyar
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Sankar K. Guchhait
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, SAS Nagar, Mohali, Punjab 160062, India
| | - Dulal Panda
- Department of Biosciences
and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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82
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Wang FJ, Xu H, Xin M, Zhang Z. $$\hbox {I}_{2}$$ I 2 -mediated amination/cyclization of ketones with 2-aminopyridines under high-speed ball milling: solvent- and metal-free synthesis of 2,3-substituted imidazo[1,2-a]pyridines and zolimidine. Mol Divers 2016; 20:659-66. [DOI: 10.1007/s11030-016-9666-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 03/04/2016] [Indexed: 12/31/2022]
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83
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Manvar P, Shaikh F, Kakadiya R, Mehariya K, Khunt R, Pandey B, Shah A. Synthesis of novel imidazo[1,2-a]pyridine-4-hydroxy-2H-coumarins by Groebke–Blackburn–Bienaymé multicomponent reaction as potential NS5B inhibitors. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.01.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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84
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Huo C, Tang J, Xie H, Wang Y, Dong J. CBr4 Mediated Oxidative C–N Bond Formation: Applied in the Synthesis of Imidazo[1,2-α]pyridines and Imidazo[1,2-α]pyrimidines. Org Lett 2016; 18:1016-9. [DOI: 10.1021/acs.orglett.6b00137] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Congde Huo
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Jing Tang
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Haisheng Xie
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Yajun Wang
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Jie Dong
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
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85
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Yadav S, Srivastava M, Rai P, Tripathi BP, Mishra A, Singh J, Singh J. Oxidative organophotoredox catalysis: a regioselective synthesis of 2-nitro substituted imidazopyridines and 3-substituted indoles, initiated by visible light. NEW J CHEM 2016. [DOI: 10.1039/c6nj02365g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Intramolecular C–N heterocyclization and C–C bond formation under visible light irradiation at room temperature was accomplished with a metal-free photoredox catalyst.
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Affiliation(s)
- Snehlata Yadav
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
| | - Madhulika Srivastava
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
| | - Pratibha Rai
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
| | - Bhartendu Pati Tripathi
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
| | - Anu Mishra
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
| | - Jaya Singh
- Department of Chemistry
- LRPG College
- Sahibabad
- India
| | - Jagdamba Singh
- Environmentally Benign Synthesis Lab
- Department of Chemistry
- University of Allahabad
- Allahabad-211002
- India
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86
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Payra S, Saha A, Wu CM, Selvaratnam B, Dramstad T, Mahoney L, Verma SK, Thareja S, Koodali R, Banerjee S. Fe–SBA-15 catalyzed synthesis of 2-alkoxyimidazo[1,2-a]pyridines and screening of their in silico selectivity and binding affinity to biological targets. NEW J CHEM 2016. [DOI: 10.1039/c6nj02134d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Regioselective synthesis of 2-alkoxyimidazopyridines by Fe-SBA-15 and screening of their in silico binding affinity to biological targets.
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Affiliation(s)
- Soumen Payra
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Arijit Saha
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Chia-Ming Wu
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | | | - Thorn Dramstad
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Luther Mahoney
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Sant Kumar Verma
- School of Pharmaceutical Sciences
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Suresh Thareja
- School of Pharmaceutical Sciences
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Ranjit Koodali
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Subhash Banerjee
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
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87
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Chakraborty A, Jana S, Kibriya G, Dey A, Hajra A. tert-Butyl nitrite mediated azo coupling between anilines and imidazoheterocycles. RSC Adv 2016. [DOI: 10.1039/c6ra03070j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A tBuONO mediated practical and efficient method for the synthesis of azo imidazoheterocycles with broad functionalities has been achieved by the reaction between imidazoheterocycles and anilines at room temperature in goods yields.
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Affiliation(s)
| | - Sourav Jana
- Department of Chemistry
- Visva-Bharati (A Central University)
- India
| | - Golam Kibriya
- Department of Chemistry
- Visva-Bharati (A Central University)
- India
| | - Amrita Dey
- Department of Chemistry
- Visva-Bharati (A Central University)
- India
| | - Alakananda Hajra
- Department of Chemistry
- Visva-Bharati (A Central University)
- India
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88
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Chen Z, Wen Y, Luo G, Ye M, Wang Q. Transition-metal-free C–C bond cleavage and formation: efficient synthesis of 2,3-diarylimidazo[1,2-α]pyridines from 2-aminopyridines and alkynoates. RSC Adv 2016. [DOI: 10.1039/c6ra19291b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A highly efficient transition-metal-free cyclization reaction for the synthesis of 2,3-diarylimidazo[1,2-α]pyridines is described.
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Affiliation(s)
- Zhengwang Chen
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Yuelu Wen
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Guotian Luo
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Min Ye
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Qinghao Wang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
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89
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Payra S, Saha A, Banerjee S. Nano-NiFe2O4 catalyzed microwave assisted one-pot regioselective synthesis of novel 2-alkoxyimidazo[1,2-a]pyridines under aerobic conditions. RSC Adv 2016. [DOI: 10.1039/c5ra25540f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here, we have demonstrated regioselective synthesis of novel 2-alkoxy-3-arylimidazo[1,2-a]pyridines using nano-NiFe2O4 as reusable catalyst via one-pot sequential aza-Michael addition, Fe-promoted ligand transfer and C–H imination reactions.
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Affiliation(s)
- Soumen Payra
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
| | - Arijit Saha
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
| | - Subhash Banerjee
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
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90
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Zali-Boeini H, Norastehfar N, Amiri Rudbari H. One-step synthesis of imidazo[1,2-a]pyridines in water. RSC Adv 2016. [DOI: 10.1039/c6ra17065j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
A novel efficient and convenient synthesis of imidazo[1,2-a]pyridines in water has been developed.
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91
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Tazeem T, Han X, Zhou Q, Wei J, Tien P, Yang G, Wu S, Dong C. A facile one-pot multi-component synthesis of novel adamantine substituted imidazo[1,2-a]pyridine derivatives: identification and structure–activity relationship study of their anti-HIV-1 activity. RSC Adv 2016. [DOI: 10.1039/c6ra17656a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A series of adamantine substituted imidazo[1,2-a]pyridine derivatives were developed through a one-pot multi-component Groebke–Blackburn–Bienaymé reaction, among them several compounds were identified to be the potent inhibitors against HIV-1 cells.
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Affiliation(s)
- Tazeem Tazeem
- State Key Laboratory of Virology
- College of Life Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Xin Han
- State Key Laboratory of Virology
- College of Life Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Qingjun Zhou
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Jingchen Wei
- Department of Pharmacology
- Guilin Medical University
- Guilin
- China
| | - Po Tien
- State Key Laboratory of Virology
- College of Life Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Guichun Yang
- Hubei Collaborative Innovation Center for Advanced Organochemical Materials
- Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules
- Hubei University
- Wuhan 430062
- China
| | - Shuwen Wu
- State Key Laboratory of Virology
- College of Life Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Chune Dong
- Hubei Province Engineering and Technology Research Center for Fluorinated Pharmaceuticals
- Wuhan University School of Pharmaceutical Sciences
- Wuhan 430071
- China
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92
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Guo P, Wang C, Chen Y, Ou C, Jiang H, Chen W, Chen W, Cao H. A one pot, metal-free, three-component domino sequence for the synthesis of furans: an efficient C–O and C–N bond formation approach. RSC Adv 2016. [DOI: 10.1039/c6ra05815a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A novel one pot, metal-free, three-component domino reaction for the formation of furan derivatives has been developed from 3-phenylpropiolaldehyde, 1,3-dicarbonyl compounds and aromatic amine or aliphatic acid.
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Affiliation(s)
- Pengfeng Guo
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Changcheng Wang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Ya Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Caijun Ou
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Hangqi Jiang
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Weifeng Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Weixin Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
| | - Hua Cao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Zhongshan
- P. R. China
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93
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Lei S, Chen G, Mai Y, Chen L, Cai H, Tan J, Cao H. Regioselective Copper-Catalyzed Oxidative Cross-Coupling of Imidazo[1,2-a]pyridines with Methyl Ketones: An Efficient Route for Synthesis of 1,2-Diketones. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500803] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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94
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Wang C, Lei S, Cao H, Qiu S, Liu J, Deng H, Yan C. Regioselective Copper-Catalyzed Dicarbonylation of Imidazo[1,2-a]pyridines with N,N-Disubstituted Acetamide or Acetone: An Approach to 1,2-Diketones Using Molecular Oxygen. J Org Chem 2015; 80:12725-32. [DOI: 10.1021/acs.joc.5b02417] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Changcheng Wang
- College
of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, P. R. China
| | - Sai Lei
- College
of Pharmacy, Guangdong Pharmaceutical University, Guangzhou, 510006, P. R. China
| | - Hua Cao
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Shuxian Qiu
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Jingyun Liu
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Hao Deng
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Caijuan Yan
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
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95
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Ghosh M, Hajra A. DABCO-Promoted One-Pot Facile Synthesis of Angularly Fused Furoquinolinones and Furocoumarins. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501152] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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96
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Dias Pires MJ, Poeira DL, Marques MMB. Metal-Catalyzed Cross-Coupling Reactions of Aminopyridines. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500952] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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97
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Mishra S, Hajra A. Copper-catalyzed oxidative annulation between 2-aminopyridine and arylidenemalononitrile leading to 4-oxo-pyrido[1,2-a]pyrimidine-3-carbonitrile. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.08.065] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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98
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Lei S, Cao H, Chen L, Liu J, Cai H, Tan J. Regioselective Oxidative Homocoupling Reaction: An Efficient Copper-Catalyzed Synthesis of Biimidazo[1,2-a]pyridines. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500391] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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99
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Ghosh M, Santra S, Mondal P, Kundu D, Hajra A. Diversified Synthesis of Furans by Coupling between Enols/1,3-Dicarbonyl Compounds and Nitroolefins: Direct Access to Dioxa[5]helicenes. Chem Asian J 2015; 10:2525-36. [PMID: 26227173 DOI: 10.1002/asia.201500710] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Indexed: 01/06/2023]
Abstract
A versatile method for the diversified synthesis of furans and arenofurans has been developed that proceeds through K2CO3-promoted cyclization between enols/1,3-dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole-transporting materials. This procedure also provides direct access to dioxa[5]helicenes. This reaction offers a broad substrate scope, uses an inexpensive base and environmentally benign solvent, and is operationally simple.
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Affiliation(s)
- Monoranjan Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Sougata Santra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Pallab Mondal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Dhiman Kundu
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
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100
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Mitra S, Ghosh M, Mishra S, Hajra A. Metal-Free Thiocyanation of Imidazoheterocycles through Visible Light Photoredox Catalysis. J Org Chem 2015. [DOI: 10.1021/acs.joc.5b01369] [Citation(s) in RCA: 166] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shubhanjan Mitra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Monoranjan Ghosh
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Subhajit Mishra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department
of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
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