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Lee K, Kim YA, Jung C, Sim J, Rajasekar S, Kwak JH, Viji M, Jung JK. Microwave-Mediated, Catalyst-Free Synthesis of 1,2,4-Triazolo[1,5- a]pyridines from Enaminonitriles. Molecules 2024; 29:894. [PMID: 38398645 PMCID: PMC10892893 DOI: 10.3390/molecules29040894] [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: 01/13/2024] [Revised: 02/02/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024] Open
Abstract
A catalyst-free, additive-free, and eco-friendly method for synthesizing 1,2,4-triazolo[1,5-a]pyridines under microwave conditions has been established. This tandem reaction involves the use of enaminonitriles and benzohydrazides, a transamidation mechanism followed by nucleophilic addition with nitrile, and subsequent condensation to yield the target compound in a short reaction time. The methodology demonstrates a broad substrate scope and good functional group tolerance, resulting in the formation of products in good-to-excellent yields. Furthermore, the scale-up reaction and late-stage functionalization of triazolo pyridine further demonstrate its synthetic utility. A plausible reaction pathway, based on our findings, has been proposed.
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Affiliation(s)
| | | | | | | | | | | | - Mayavan Viji
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Republic of Korea; (K.L.); (Y.-A.K.); (C.J.); (J.S.); (S.R.); (J.-H.K.)
| | - Jae-Kyung Jung
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Republic of Korea; (K.L.); (Y.-A.K.); (C.J.); (J.S.); (S.R.); (J.-H.K.)
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2
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Bodala V, Podugu RL, Yettula K, Gollamudi P, Vidavalur S, Pulipaka S. Iron-Catalysed [3+3] Annulation of Oxime Acetates and Enaminones towards the Synthesis of Multi-Substituted Pyridines. Chem Asian J 2023; 18:e202201004. [PMID: 36461710 DOI: 10.1002/asia.202201004] [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: 10/04/2022] [Revised: 11/22/2022] [Indexed: 12/04/2022]
Abstract
A direct access to unsymmetrical and symmetrical multi-substituted pyridines has been accomplished via iron-catalysed [3+3] annulation of oxime acetates with enaminones. This protocol is featured by easily available starting materials, no requirement of expensive additives and ligands, operational simplicity, and good tolerance with diverse functional groups.
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Affiliation(s)
- Varaprasad Bodala
- Department of Chemistry, Andhra University, Visakhapatnam, 530003, India
| | | | - Kumari Yettula
- Department of Chemistry, Andhra University, Visakhapatnam, 530003, India
| | - Padmarao Gollamudi
- Department of Chemistry, Dr. B. R. Ambedkar University, Srikakulam, 532410, India
| | - Siddaiah Vidavalur
- Department of Chemistry, Andhra University, Visakhapatnam, 530003, India
| | - Shyamala Pulipaka
- Department of Chemistry, Andhra University, Visakhapatnam, 530003, India
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3
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Vishwanath M, Chaudhary CL, Park Y, Viji M, Jung C, Lee K, Sim J, Hong SM, Yoon DH, Lee DH, Lee JK, Lee H, Lee MK, Kim SY, Jung JK. Total Synthesis of Isohericerinol A and Its Analogues to Access Their Potential Neurotrophic Effects. J Org Chem 2022; 87:10836-10847. [PMID: 35946352 DOI: 10.1021/acs.joc.2c01096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The secondary metabolites from Hericium erinaceus are well-known to have neurotrophic and neuroprotective effects. Isohericerinol A (1), isolated by our colleagues from its fruiting parts has a strong ability to increase the nerve growth factor secretion in C6 glioma cells. The current work describes the total synthesis of 1 and its regioisomer 5 in a few steps. We present two different approaches to 1 and a regiodivergent approach for both 1 and 5 by utilizing easily accessible feedstocks. Interestingly, the natural product 1, regioisomer 5, and their intermediates exhibited potent neurotrophic activity in in vitro experimental systems. Thus, these synthetic strategies provide access to a systematic structure-activity relationship study of natural product 1.
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Affiliation(s)
- Manjunatha Vishwanath
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Chhabi Lal Chaudhary
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Yunjeong Park
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Mayavan Viji
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Chanhyun Jung
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Kwanghee Lee
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Jaeuk Sim
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Seong Min Hong
- Gachon Institute of Pharmaceutical Sciences, College of Pharmacy, Gachon University, Incheon 21936, Korea
| | - Da Hye Yoon
- Gachon Institute of Pharmaceutical Sciences, College of Pharmacy, Gachon University, Incheon 21936, Korea
| | | | | | - Heesoon Lee
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Mi Kyeong Lee
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
| | - Sun Yeou Kim
- Gachon Institute of Pharmaceutical Sciences, College of Pharmacy, Gachon University, Incheon 21936, Korea
| | - Jae-Kyung Jung
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea
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4
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Bhajammanavar V, Sureshbabu P, Reddy MK, Baidya M. Organocatalyzed Modular Synthesis of Polycyclic Dihydropyridines and Pyridines through Sulfamate Linchpin. Chem Asian J 2022; 17:e202200400. [PMID: 35575143 DOI: 10.1002/asia.202200400] [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: 04/17/2022] [Revised: 05/15/2022] [Indexed: 11/09/2022]
Abstract
The cascade annulation between alkylidene malononitriles and cyclic sulfamidate imines has been controlled by leveraging the sulfamate functionality under organocatalysis, which allows selective access to polycyclic and densely functionalized dihydropyridines and pyridines in high yields. The protocol is scalable and shows broad substrate scope. The products were also engaged in the preparation of tetracyclic pyridopyrimidines, showcasing the synthetic versatility.
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Affiliation(s)
| | | | | | - Mahiuddin Baidya
- Indian Institute of Technology Madras, Chemistry, IIT Madras, India, Chennai, India, 600036, Chennai, INDIA
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5
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Goud SB, Guin S, Prakash M, Samanta S. Cu(OAc) 2/DABCO-mediated domino reaction of vinyl malononitriles with cyclic sulfamidate imines: access to 6-hydroxyaryl-2-aminonicotinonitriles. Org Biomol Chem 2022; 20:352-357. [PMID: 34931209 DOI: 10.1039/d1ob02095a] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A novel Cu(II)-salt/DABCO-mediated one-pot access to a myriad of highly substituted biologically relevant 2-aminonicotinonitriles possessing a resourceful phenolic moiety with satisfactory yields is reported. This method involves cyclic sulfamidate imines as 1C1N sources and different kinds of acyclic/cyclic vinyl malononitriles as 4C sources for pyridine synthesis via a vinylogous Mannich-cycloaromatization sequence process, creating two new C-N bonds under mild conditions. Importantly, this de novo strategy is applicable to gram-scale syntheses, underlining the method's practicability and allowing for a wide range of substrates with excellent functional group tolerance.
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Affiliation(s)
- S Banuprakash Goud
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, 453552 India.
| | - Soumitra Guin
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, 453552 India.
| | - Meher Prakash
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, 453552 India.
| | - Sampak Samanta
- Department of Chemistry, Indian Institute of Technology Indore, Simrol, 453552 India.
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6
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Gujjarappa R, Vodnala N, Musib D, Malakar CC. Organocatalytic Decarboxylation and Dual C(sp
3
)−H Bond Functionalization Toward Facile Access to Divergent 2,6‐Diarylpyridines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
| | - Nagaraju Vodnala
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
- Department of Chemistry Indian Institute of Technology Delhi Multi-storey building, HauzKhas New Delhi 110016 India
| | - Dulal Musib
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
| | - Chandi C. Malakar
- Department of Chemistry National Institute of Technology Manipur Langol Imphal 795004 Manipur India
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7
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Sim J, Lanka S, Jo JW, Chaudhary CL, Vishwanath M, Jung CH, Lee YH, Kim EY, Kim YS, Hyun SS, Lee HS, Lee K, Seo SY, Viji M, Jung JK. Inhibitory Effect of Chlorogenic Acid Analogues Comprising Pyridine and Pyrimidine on α-MSH-Stimulated Melanogenesis and Stability of Acyl Analogues in Methanol. Pharmaceuticals (Basel) 2021; 14:1176. [PMID: 34832958 PMCID: PMC8622415 DOI: 10.3390/ph14111176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/11/2021] [Accepted: 11/14/2021] [Indexed: 11/30/2022] Open
Abstract
In continuation of studies for α-MSH stimulated melanogenesis inhibitors, we have evaluated the design, synthesis, and activity of a new series of chlorogenic acid (CGA) analogues comprising pyridine, pyrimidine, and diacyl derivatives. Among nineteen synthesized compounds, most of them (fifteen) exhibited better inhibitions of melanin formation in B16 melanoma cells. The results illustrated that a pyridine analogue 6f and a diacyl derivative 13a of CGA showed superior inhibition profiles (IC50: 2.5 ± 0.7 μM and 1.1 ± 0.1 μM, respectively) of α-MSH activities than positive controls, kojic acid and arbutin (IC50: 54 ± 1.5 μM and 380 ± 9.5 μM, respectively). The SAR studies showed that both -CF3 and -Cl groups exhibited better inhibition at the meta position on benzylamine than their ortho and para positions. In addition, the stability of diacyl analogues of CGA in methanol monitored by HPLC for 28 days indicated the steric bulkiness of acyl substituents as a key factor in their stability.
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Affiliation(s)
- Jaeuk Sim
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Srinu Lanka
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Jeong-Woong Jo
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Chhabi Lal Chaudhary
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Manjunatha Vishwanath
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Chan-Hyun Jung
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Young-Hee Lee
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
- Samjin Central Research Institute, Samjin Pharma Co., Ltd., Cheongju 28158, Korea
| | - Eun-Yeong Kim
- College of Pharmacy, Korea University, Sejong 30019, Korea; (E.-Y.K.); (K.L.)
| | - Young-Soo Kim
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Soon-Sil Hyun
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Hee-Soon Lee
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Kiho Lee
- College of Pharmacy, Korea University, Sejong 30019, Korea; (E.-Y.K.); (K.L.)
| | - Seung-Yong Seo
- Gachon Institute of Pharmaceutical Sciences, College of Pharmacy, Gachon University, Incheon 21936, Korea;
| | - Mayavan Viji
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
| | - Jae-Kyung Jung
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Korea; (J.S.); (S.L.); (J.-W.J.); (C.L.C.); (M.V.); (C.-H.J.); (Y.-H.L.); (Y.-S.K.); (S.-S.H.); (H.-S.L.)
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8
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Khan E. Pyridine Derivatives as Biologically Active Precursors; Organics and Selected Coordination Complexes. ChemistrySelect 2021. [DOI: 10.1002/slct.202100332] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Ezzat Khan
- Department of Chemistry University of Malakand, Chakdara 18800, Lower Dir Khyber Pakhtunkhwa Pakistan
- Department of Chemistry, College of Science University of Bahrain Sakhir 32038 Bahrain
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Hagui W, Soulé JF. Synthesis of 2-Arylpyridines and 2-Arylbipyridines via Photoredox-Induced Meerwein Arylation with in Situ Diazotization of Anilines. J Org Chem 2020; 85:3655-3663. [DOI: 10.1021/acs.joc.9b03306] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Wided Hagui
- Univ Rennes, CNRS, UMR 6226, F-3500 Rennes, France
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10
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Viji M, Vishwanath M, Sim J, Park Y, Jung C, Lee S, Lee H, Lee K, Jung JK. α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and other N-heterocycles via decarboxylative oxidative annulation reaction. RSC Adv 2020; 10:37202-37208. [PMID: 35521290 PMCID: PMC9057147 DOI: 10.1039/d0ra07093a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/04/2020] [Indexed: 01/18/2023] Open
Abstract
A metal-free and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include the in situ generation of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford the corresponding quinoxalines, quinazolinones derivatives in moderate to high yields. A TBHP mediated, metal-free approach for the synthesis of quinoxalines, quinazolinones, and indolo quinoxaline was developed from alpha hydroxy acids via decarboxylation followed by condensation.![]()
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Affiliation(s)
- Mayavan Viji
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Manjunatha Vishwanath
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Jaeuk Sim
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Yunjeong Park
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Chanhyun Jung
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Seohu Lee
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Heesoon Lee
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Kiho Lee
- College of Pharmacy
- Korea University
- Sejong 30019
- Republic of Korea
| | - Jae-Kyung Jung
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
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