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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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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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3
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Jung Y, Hong JE, Kwak JH, Park Y. Single-Step Approach toward Nitrones via Pyridinium Ylides: The DMAP-Catalyzed Reaction of Benzyl Halides with Nitrosoarenes. J Org Chem 2021; 86:6343-6350. [PMID: 33890771 DOI: 10.1021/acs.joc.1c00158] [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
A single-step approach is reported for the preparation of nitrones from benzyl halides and nitrosoarenes via pyridinium ylides, utilizing 4-dimethylaminopyridine (DMAP) catalyst and mild reaction conditions (Li2CO3, dimethylacetamide, and room temperature). The reaction provides both keto- and aldonitrones in high yields with a wide scope for benzyl halides and nitrosoarenes. In the same reaction system, 2-methyl-2-nitrosopropane, which does not have an aryl group, also affords the corresponding N-tert-butyl nitrones from primary benzyl bromides that have an electron-withdrawing group. As an application of the reaction, methyl 2-bromo-2-phenylacetate was used to prepare the corresponding isoxazolidine by a sequential one-pot synthesis.
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Affiliation(s)
- Yeonghun Jung
- College of Pharmacy, Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Jee Eun Hong
- College of Pharmacy, Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 50834, Republic of Korea
| | - Jae-Hwan Kwak
- College of Pharmacy, Kyungsung University, 309 Suyeong-ro, Nam-gu, Busan 48434, Republic of Korea
| | - Yohan Park
- College of Pharmacy, Inje Institute of Pharmaceutical Sciences and Research, Inje University, 197 Inje-ro, Gimhae, Gyeongnam 50834, Republic of Korea
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4
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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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5
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Yanai K, Togo H. Novel preparation of N-arylmethyl-N-arylmethyleneamine N-oxides from benzylic bromides with zinc and isobutyl nitrite. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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6
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Qiu S, Liang R, Wang Y, Zhu S. Domino Reaction between Nitrosoarenes and Ynenones for Catalyst-Free Preparation of Indanone-Fused Tetrahydroisoxazoles. Org Lett 2019; 21:2126-2129. [DOI: 10.1021/acs.orglett.9b00426] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Shaotong Qiu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province and Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Renxiao Liang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province and Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
| | | | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province and Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
- Singfar Laboratories, Guangzhou, 510670, China
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