1
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Zhang F, Liu L, Chen X, Hou H, Han Y, Yan C, Shi Y, Zhu S. Visible-Light-Induced and Iodoform-Promoted Functionalization of Ether with Secondary Sulfonyl Amides. J Org Chem 2024; 89:687-691. [PMID: 38101330 DOI: 10.1021/acs.joc.3c01545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2023]
Abstract
An iodoform-promoted functionalization of ether with secondary sulfonyl amides under visible-light irradiation was developed toward synthesis of hemiaminal skeleton with good to excellent isolated yields. The characterization of the isolated ether and iodoform complex revealed regioselective hydrogen atom transfer to initiate carbon radical formation and enabled the amination reaction with the sulfonamide.
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Affiliation(s)
- Fengrong Zhang
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Lanqin Liu
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Xiaoyun Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212005, China
| | - Hong Hou
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Ying Han
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Chaoguo Yan
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Yaocheng Shi
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
| | - Shaoqun Zhu
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou, 225009, China
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2
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Cao H, Histand G, Lin D. Selectfluor-Induced Oxidative Amination of N-Heteroaromatics with Purine. J Org Chem 2023; 88:5687-5695. [PMID: 37120834 DOI: 10.1021/acs.joc.3c00149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
An oxidative coupling reaction between purines and aromatic N-heterocycles was developed to synthesize a series of N-heteroaryl purine derivatives using Selectfluor as an oxidant at room temperature. This process uses a commercial oxidant, uses no base, metal, or other additives, is simple to carry out, and has a broad range of substrates.
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Affiliation(s)
- Haiyan Cao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
| | - Gary Histand
- The International School of Advanced Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510641, China
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3
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Lu C, Histand G, Lin D. Visible light-induced direct alkylation of the purine C 8-H bond with ethers. Org Biomol Chem 2023; 21:3167-3171. [PMID: 36947139 DOI: 10.1039/d3ob00147d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
The one-step visible light-induced direct alkylation of the C8-H bond for purine derivatives by ethers was developed using Eosin Y as the photocatalyst and t-BuOOH as the oxidant at room temperature. This method describes the coupling of the α-C of the ether to the C8 of purine. Of particular interest is that substrates include purines with various functional groups and even unprotected 9H-purines. The protocol provides an effective method for the synthesis of 8-alkylpurine derivatives with high atom economy and high regioselectivity.
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Affiliation(s)
- Changtong Lu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
| | - Gary Histand
- International School of Advanced Materials, South China University of Technology, Guangzhou 510641, China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.
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4
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A pair of new enantiomeric hybrid phthalide–adenines with a rare 5-oxa-1-azaspiro[3,4]octane moiety and two pairs of new enantiomeric hybrid paraethyl phenol–adenines from Ligusticum chuanxiong. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
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5
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Giuzio F, Bonomo MG, Catalano A, Infantino V, Salzano G, Monné M, Geronikaki A, Petrou A, Aquaro S, Sinicropi MS, Saturnino C. Potential PDE4B inhibitors as promising candidates against SARS-CoV-2 infection. Biomol Concepts 2023; 14:bmc-2022-0033. [PMID: 37909122 DOI: 10.1515/bmc-2022-0033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 07/10/2023] [Indexed: 11/02/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is an RNA virus belonging to the coronavirus family responsible for coronavirus disease 2019 (COVID-19). It primarily affects the pulmonary system, which is the target of chronic obstructive pulmonary disease (COPD), for which many new compounds have been developed. In this study, phosphodiesterase 4 (PDE4) inhibitors are being investigated. The inhibition of PDE4 enzyme produces anti-inflammatory and bronchodilator effects in the lung by inducing an increase in cAMP concentrations. Piclamilast and rolipram are known selective inhibitors of PDE4, which are unfortunately endowed with common side effects, such as nausea and emesis. The selective inhibition of the phosphodiesterase 4B (PDE4B) subtype may represent an intriguing technique for combating this highly contagious disease with fewer side effects. In this article, molecular docking studies for the selective inhibition of the PDE4B enzyme have been carried out on 21 in-house compounds. The compounds were docked into the pocket of the PDE4B catalytic site, and in most cases, they were almost completely superimposed onto piclamilast. Then, in order to enlarge our study, drug-likeness prediction studies were performed on the compounds under study.
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Affiliation(s)
- Federica Giuzio
- International PhD Programme 'Sciences', Department of Science, University of Basilicata, Viale dell'Ateneo Lucano n.10, 85100 Potenza, Italy
- Department of Science, University of Basilicata, 85100 Potenza, Italy
| | | | - Alessia Catalano
- Department of Pharmacy-Drug Sciences, University of Bari "Aldo Moro", 70126 Bari, Italy
| | | | - Giovanni Salzano
- Department of Science, University of Basilicata, 85100 Potenza, Italy
| | - Magnus Monné
- Department of Science, University of Basilicata, 85100 Potenza, Italy
| | - Athina Geronikaki
- School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Anthi Petrou
- School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Stefano Aquaro
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Italy
| | - Maria Stefania Sinicropi
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, 87036 Arcavacata di Rende, Italy
| | - Carmela Saturnino
- Department of Science, University of Basilicata, 85100 Potenza, Italy
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6
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Ravindar L, Hasbullah SA, Hassan NI, Qin HL. Cross‐Coupling of C‐H and N‐H Bonds: a Hydrogen Evolution Strategy for the Construction of C‐N Bonds. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lekkala Ravindar
- Universiti Kebangsaan Malaysia Fakulti Teknologi dan Sains Maklumat Chemical Sciences Faculty of Science & Technology 43600 Bandar Baru Bangi MALAYSIA
| | - Siti Aishah Hasbullah
- Universiti Kebangsaan Malaysia Fakulti Sains dan Teknologi Chemical Sciences Faculty of Science & Technology 43600 Bandar Baru Bangi MALAYSIA
| | - Nurul Izzaty Hassan
- Universiti Kebangsaan Malaysia Fakulti Sains dan Teknologi Chemical Sciences Faculty of Science & Technology 43600 Bandar Baru Bangi MALAYSIA
| | - Hua-Li Qin
- Wuhan University of Technology School of Chemistry 430070 Hubei CHINA
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7
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Li X, Qi P, Du H. Cross dehydrogenation coupling reaction of purine derivatives with thioethers. Org Biomol Chem 2022; 20:1058-1066. [PMID: 35023527 DOI: 10.1039/d1ob02353e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A metal-free cross-dehydrogenation coupling method was established to synthesize N9 alkylated purine derivatives. Using PhI(OAc)2 as the oxidant, versatile thioethers were successfully employed as alkylation reagents. Under the optimized conditions, a variety of alkylated purine derivatives and other aromatic N-heterocycles were obtained in moderate to good yields. The regioselectivity of this protocol which involves the reaction of unsymmetrical thioethers with purine derivatives was also studied.
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Affiliation(s)
- Xinjie Li
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China.
| | - Peng Qi
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China.
| | - Hongguang Du
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China.
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8
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Sofi FA, Sharma R, Masoodi MH, Tabassum N. Recent developments in oxidative functionalization reactions promoted by TBAI/TBHP. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.2001659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Firdoos Ahmad Sofi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
| | - Rohit Sharma
- Department of Forest Products, College of Forestry, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, India
| | - Mubashir H. Masoodi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
| | - Nahida Tabassum
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
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9
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Nagao K, Ohmiya H. Carbocation Generation by Organophotoredox Catalysis. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.1005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kazunori Nagao
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University
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10
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Zhao M, Qin Z, Zhang K, Li J. Metal-free site-selective C-H cyanoalkylation of 8-aminoquinoline and aniline-derived amides with azobisisobutyronitrile. RSC Adv 2021; 11:30719-30724. [PMID: 35479854 PMCID: PMC9041112 DOI: 10.1039/d1ra06013a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 08/25/2021] [Indexed: 12/17/2022] Open
Abstract
Using K2S2O8, an efficient and metal-free site-selective C–H cyanoalkylation of 8-aminoquinoline and aniline-derived amides with AIBN (azobisisobutyronitrile) was developed. Without any catalyst, various substrates and functional groups were compatible to afford corresponding products in moderate to high yields. A mechanism study displayed that a radical–radical coupling process was involved via the N-centered radical generation and delocalization of aryl amides. An efficient metal-free cyanoalkylation of 8-aminoquinoline and aniline-derived amides was achieved in the presence of K2S2O8. The method showed good substrate tolerance and also suitable for bromination and dimerization reactions.![]()
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Affiliation(s)
- Mengfei Zhao
- Department of Organic Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China
| | - Zengxin Qin
- Department of Organic Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China
| | - Kaixin Zhang
- Department of Organic Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China
| | - Jizhen Li
- Department of Organic Chemistry, College of Chemistry, Jilin University 2519 Jiefang Road Changchun 130021 P. R. China
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11
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Kobayashi R, Shibutani S, Nagao K, Ikeda Z, Wang J, Ibáñez I, Reynolds M, Sasaki Y, Ohmiya H. Decarboxylative N-Alkylation of Azoles through Visible-Light-Mediated Organophotoredox Catalysis. Org Lett 2021; 23:5415-5419. [PMID: 34139122 DOI: 10.1021/acs.orglett.1c01745] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An organophotoredox-catalyzed decarboxylative cross-coupling between azole nucleophiles and aliphatic carboxylic acid-derived redox-active esters is demonstrated. This protocol efficiently installs various tertiary or secondary alkyl fragments onto the nitrogen atom of azole nucleophiles under mild and transition-metal-free conditions. The pyridinium additive successfully inhibits the formation of elimination byproducts from the carbocation intermediate. This reaction is applicable to the synthesis of a protein-degrader-like molecule containing an azole and a thalidomide.
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Affiliation(s)
- Rino Kobayashi
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Shotaro Shibutani
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Kazunori Nagao
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Zenichi Ikeda
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Junsi Wang
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Ignacio Ibáñez
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Matthew Reynolds
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Yusuke Sasaki
- Research, Takeda Pharmaceutical Company Limited, 2-26-1 Muraoka-Higashi, Fujisawa, Kanagawa 251-8555, Japan
| | - Hirohisa Ohmiya
- Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.,JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
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12
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Wei WT, Li Q, Zhang MZ, He WM. N-Radical enabled cyclization of 1,n-enynes. CHINESE JOURNAL OF CATALYSIS 2021. [DOI: 10.1016/s1872-2067(20)63702-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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13
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Cīrule D, Novosjolova I, Spuris A, Mishnev A, Bizdēna Ē, Turks M. Toward unsymmetrical 2,6-bistriazolylpurine nucleosides. Chem Heterocycl Compd (N Y) 2021. [DOI: 10.1007/s10593-021-02906-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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14
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More SG, Kamble RB, Suryavanshi G. Oxidative Radical-Mediated Addition of Ethers to Quinone Imine Ketals: An Access to Hemiaminals. J Org Chem 2021; 86:2107-2116. [DOI: 10.1021/acs.joc.0c02254] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Satish G. More
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201 002, India
| | - Rohit B. Kamble
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201 002, India
| | - Gurunath Suryavanshi
- Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research, Ghaziabad, Uttar Pradesh 201 002, India
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15
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Polat MF, Tuncbilek M. Highly efficient chemical phosphorylation of 6-(4-phenylpiperazine-1-yl)-9-(β-D-ribofuranosyl)-9 H-purine. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2021; 40:233-241. [PMID: 33416028 DOI: 10.1080/15257770.2020.1843679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Antimetabolites, which are metabolic antagonists used in the treatment of cancer and viral diseases by replacing metabolites, inhibit the action of metabolic enzymes and disrupt the pathways of synthesis of structural units necessary for the formation of nucleic acids. Purine antagonists, that are subunits of antimetabolites, reduce the production of purine bases, and hence, cause the nucleotide production to stop and bring about the death of cancer cells. Fludarabine (2-fluoro-ara-AMP), which is used in chemotherapy, is an antimetabolite of the purine class containing mono phosphate in its structure. In this study, a protocol was presented to effectively and efficiently synthesis of 6-(4-phenylpiperazine-1-yl)-9-(β-D-ribofuranosyl)-9H-purine-5'- O-phosphate compound in six steps and 25% overall yield starting with commercially available 6-chloropurine.
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Affiliation(s)
- M Fatih Polat
- Department of Pharmaceutical Basic Sciences, Faculty of Pharmacy, Erzincan Binali Yildirim University, Erzincan, Turkey
| | - Meral Tuncbilek
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Ankara University, Ankara, Turkey
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16
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Zhuge J, Jiang Z, Jiang W, Histand G, Lin D. Iodine-catalyzed oxidative functionalization of purines with (thio)ethers or methylarenes for the synthesis of purin-8-one analogues. Org Biomol Chem 2021; 19:5121-5126. [PMID: 34018534 DOI: 10.1039/d1ob00118c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient oxidative functionalization of purine-like substrates with (thio)ethers or methylarenes under mild conditions is described. Using I2 as the catalyst, and TBHP as the oxidant, this protocol provides a valuable synthetic tool for the assembly of a wide range of 9-alkyl(benzyl)purin-8-one derivatives with high atom- and step-economy and exceptional functional group tolerance.
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Affiliation(s)
- Juanping Zhuge
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Ziyang Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Wei Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Gary Histand
- International School of Advanced Materials, South China University of Technology, Guangzhou 510640, China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
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17
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Efficient Synthesis of α-Branched Purine-Based Acyclic Nucleosides: Scopes and Limitations of the Method. Molecules 2020; 25:molecules25184307. [PMID: 32961820 PMCID: PMC7571146 DOI: 10.3390/molecules25184307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/11/2020] [Accepted: 09/17/2020] [Indexed: 01/18/2023] Open
Abstract
An efficient route to acylated acyclic nucleosides containing a branched hemiaminal ether moiety is reported via three-component alkylation of N-heterocycle (purine nucleobase) with acetal (cyclic or acyclic, variously branched) and anhydride (preferentially acetic anhydride). The procedure employs cheap and easily available acetals, acetic anhydride, and trimethylsilyl trifluoromethanesulfonate (TMSOTf). The multi-component reaction is carried out in acetonitrile at room temperature for 15 min and provides moderate to high yields (up to 88%) of diverse acyclonucleosides branched at the aliphatic side chain. The procedure exhibits a broad substrate scope of N-heterocycles and acetals, and, in the case of purine derivatives, also excellent regioselectivity, giving almost exclusively N-9 isomers.
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18
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Qi P, Sun F, Chen N, Du H. Cross-Dehydrogenative Coupling of Azoarenes with Dialkyl Disulfides. J Org Chem 2020; 85:8588-8596. [DOI: 10.1021/acs.joc.0c00953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Peng Qi
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Fang Sun
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Ning Chen
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Hongguang Du
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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19
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Song S, Meng Y, Li Q, Wei W. Recent Progress in the Construction of C−N Bonds
via
Metal‐Free Radical C(
sp
3
)−H Functionalization. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000055] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Si‐Zhe Song
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, School of Materials Science and Chemical EngineeringNingbo University Ningbo 315211 People's Republic of China
| | - Ya‐Nan Meng
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, School of Materials Science and Chemical EngineeringNingbo University Ningbo 315211 People's Republic of China
| | - Qiang Li
- Institution of Functional Organic Molecules and Materials, School of Chemistry and Chemical EngineeringLiaocheng University Liaocheng 252059 People's Republic of China
| | - Wen‐Ting Wei
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, School of Materials Science and Chemical EngineeringNingbo University Ningbo 315211 People's Republic of China
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20
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Jiang W, Zhuge J, Li J, Histand G, Lin D. Direct Sulfenylation of the Purine C 8-H Bond with Thiophenols. J Org Chem 2020; 85:2415-2425. [PMID: 31898455 DOI: 10.1021/acs.joc.9b03115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The one-step copper-mediated regioselective formation of the C8-S bond for purine derivatives with arylthiols was achieved using air as the green oxidant in the presence of 1.0 equiv of Na2CO3 and stoichiometric CuCl and 1,10-phenanthroline monohydrate. This method provides an economical, easy-to-handle, and effective method for the synthesis of 8-sulfenylpurine derivatives in moderate to excellent yields. The reaction is selective for C8 over C2 and C6. It also tolerates a free amine on the purine, and it has a wide substrate scope.
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Affiliation(s)
- Wei Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Juanping Zhuge
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Jianxiao Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
| | - Gary Histand
- International School of Advanced Materials , South China University of Technology , Guangzhou 510640 , P. R. China
| | - Dongen Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510641 , P. R. China
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21
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Hernández‐Guerra D, Hlavačková A, Pramthaisong C, Vespoli I, Pohl R, Slanina T, Jahn U. Photochemical C−H Amination of Ethers and Geminal Difunctionalization Reactions in One Pot. Angew Chem Int Ed Engl 2019; 58:12440-12445. [DOI: 10.1002/anie.201905209] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 06/18/2019] [Indexed: 01/19/2023]
Affiliation(s)
- Daniel Hernández‐Guerra
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Anna Hlavačková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Chiranan Pramthaisong
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Ilaria Vespoli
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Tomáš Slanina
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
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22
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Hernández‐Guerra D, Hlavačková A, Pramthaisong C, Vespoli I, Pohl R, Slanina T, Jahn U. Photochemical C−H Amination of Ethers and Geminal Difunctionalization Reactions in One Pot. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905209] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Daniel Hernández‐Guerra
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Anna Hlavačková
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Chiranan Pramthaisong
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Ilaria Vespoli
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Tomáš Slanina
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo námĕstí 2 16610 Prague 6 Czech Republic
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23
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Wu HQ, Yang K, Luo SH, Wu XY, Wang N, Chen SH, Wang ZY. C4-Selective Synthesis of Vinyl Thiocyanates and Selenocyanates Through 3,4-Dihalo-2(5H
)-furanones. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900749] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Han-Qing Wu
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
- School of Pharmaceutical Sciences; Xiamen University; 361005 Xiamen People′s Republic of China
| | - Kai Yang
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
- College of Pharmacy; Gannan Medical University; 341000 Ganzhou People′s Republic of China
| | - Shi-He Luo
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; 381 Wushan Road 510640 Guangzhou People's Republic of China
| | - Xin-Yan Wu
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
| | - Neng Wang
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
| | - Si-Hong Chen
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
| | - Zhao-Yang Wang
- School of Chemistry and Environment; Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; South China Normal University; 510006 Guangzhou People′s Republic of China
- Key Laboratory of Functional Molecular Engineering of Guangdong Province; School of Chemistry and Chemical Engineering; South China University of Technology; 381 Wushan Road 510640 Guangzhou People's Republic of China
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24
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Dian L, Xing Q, Zhang-Negrerie D, Du Y. Direct functionalization of alkyl ethers to construct hemiaminal ether skeletons (HESs). Org Biomol Chem 2019; 16:4384-4398. [PMID: 29781030 DOI: 10.1039/c8ob00793d] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Hemiaminal ether skeletons (HESs) are important backbones generally found in organic compounds. Compared to traditional functional group transformations, strategies for the C-H functionalization of alkyl ethers to construct HESs have drawn much attention in the past decade. In this review, we focus on the recent progress in developing various pathways to construct HESs via the direct functionalization of alkyl ethers, including: (a) the transition-metal-catalyzed nitrene insertion pathway, (b) the transition-metal-free organonitrenoid insertion pathway,
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Affiliation(s)
- Longyang Dian
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China.
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25
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Chen Z, Liu B, Liang P, Luo H, Zheng J, Wen X, Liu T, Luo G, Ye M. Construction of N-S and C-N Bonds from Reactions of Benzofuroxans with DMSO or THF. ACS OMEGA 2019; 4:281-291. [PMID: 31459330 PMCID: PMC6648239 DOI: 10.1021/acsomega.8b03353] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 12/25/2018] [Indexed: 05/06/2023]
Abstract
Novel ring-opening reactions are achieved employing benzofuroxan as a new type of iminating or aminating reagent. These diverse transformations give access to three types of molecular scaffolds, N-aryl dimethylsulfoximines, methanesulfonamides, and hemiaminal ethers, which are important structural motifs in organic and medicinal chemistry. The procedures feature solvent-involved reactions, easily available starting materials, operational simplicity, high atom economy, and the potential further transformation of nitro group.
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Affiliation(s)
- Zhengwang Chen
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
- Key
Laboratory of Functional Molecular Engineering of Guangdong Province, South China University of Technology, Guangzhou 510640, P. R. China
- E-mail: (Z.C.)
| | - Botao Liu
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Pei Liang
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Haiqing Luo
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Jing Zheng
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Xiaowei Wen
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Tanggao Liu
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Guotian Luo
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Min Ye
- Key
Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, P. R. China
- E-mail: (M.Y.)
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26
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Dong Y, Yang J, He S, Shi ZC, Wang Y, Zhang XM, Wang JY. Metal-free oxidative cross-dehydrogenative coupling of quinones with benzylic C(sp3)–H bonds. RSC Adv 2019; 9:27588-27592. [PMID: 35529195 PMCID: PMC9070767 DOI: 10.1039/c9ra05678e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 08/28/2019] [Indexed: 12/23/2022] Open
Abstract
A metal-free cross-dehydrogenative coupling of quinones with toluene derivatives has been established. A series of quinones were subjected to reaction with toluene derivatives in the presence of di-tertbutyl peroxide (DTBP) for direct synthesis of benzylquinones. The method exhibits good functional group tolerance, and desired products were obtained in moderate to good yields. Meanwhile, a radical pathway was proposed to describe the cross-dehydrogenative coupling of quinones with toluene derivatives. A metal-free cross-dehydrogenative coupling of quinones with toluene derivatives has been established. A series of quinones were subjected to reaction with toluene derivatives in the presence of DTBP for direct synthesis of benzylquinones.![]()
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Affiliation(s)
- Yu Dong
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- P. R. China
- University of Chinese Academy of Sciences
| | - Jian Yang
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- P. R. China
- University of Chinese Academy of Sciences
| | - Shuai He
- Southwest Minzu University
- Chengdu 610041
- P. R. China
| | | | - Yu Wang
- Guizhou Education University
- Guiyang 550018
- P. R. China
| | - Xiao-Mei Zhang
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- P. R. China
| | - Ji-Yu Wang
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- P. R. China
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27
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Wu X, Qiao K, Qin H, Zhang D, Gao D, Yang Z, Fang Z, Guo K. Silver(i)-mediated oxidative C(sp3)–H amination of ethers with azole derivatives under mild conditions. Org Chem Front 2019. [DOI: 10.1039/c9qo00644c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A silver(i)-mediated oxidative N–H/C(sp3)–H coupling of NH-azoles with ethers has been developed.
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Affiliation(s)
- Xiaoyu Wu
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Kai Qiao
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Hong Qin
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Dong Zhang
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Di Gao
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Zhao Yang
- School of Engineering
- China Pharmaceutical University
- Nanjing 211198
- China
| | - Zheng Fang
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
- State Key Laboratory of Materials-Oriented Chemical Engineering
| | - Kai Guo
- College of Biotechnology and Pharmaceutical Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
- State Key Laboratory of Materials-Oriented Chemical Engineering
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28
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Torres Hernandez AX, Weeramange CJ, Desman P, Fatino A, Haney O, Rafferty RJ. Efforts in redesigning the antileukemic drug 6-thiopurine: decreasing toxic side effects while maintaining efficacy. MEDCHEMCOMM 2018; 10:169-179. [PMID: 30774864 DOI: 10.1039/c8md00463c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 12/15/2018] [Indexed: 01/14/2023]
Abstract
6-Thiopurine (6TP) is a currently prescribed drug in the treatment of diseases ranging from Crohn's disease to acute lymphocytic leukemia. While its potent mode of action is through incorporation into DNA as a thiol mimic of deoxyguanosine, severe toxicities are associated with its administration which hinder the potential therapeutic application. We have previously reported in vitro that the oxidative metabolites of 6TP, specifically 6-thiouric acid (6TU, K i 7 μM), are potent inhibitors of UDP-glucose dehydrogenase (UDPGDH), an enzyme that is responsible for the formation of UDP-glucuronic acid (UDPGA), an essential substrate that is used in detoxification processes in the liver. An in vivo investigation was undertaken to probe if 6TU inhibits UDPGDH in rat hepatocytes, and it was observed that 6TU does greatly suppress the conjugation of bilirubin with UDPGA. The failed excretion of bilirubin is linked to a majority of the reported toxicities associated with 6TP administration. Efforts were undertaken for the construction of 6TP analogs, substituted at the C8 position, to reduce inhibition of UDPGDH while retaining therapeutic efficacy. Three new 6TP analogs bearing a halogen (Br, Cl, and F) at the C8 position have been achieved over five-synthetic steps in overall yields of 16 to 32%. Each of these analogs were shown to have reduced inhibition towards UDPGDH, with K i values of 192, 163, 215 μM, respectively. In addition, the bromine, chlorine, and fluorine analogs were shown to possess cytotoxicity towards the REH cell line (acute lymphocytic leukemia) having IC50 values of 9.54 μM (±0.97), 3.95 μM (±1.94), and 4.71 μM (±1.40), respectively. These three new 6TP analogs represent the first steps in the redesign of this potent anticancer agent into a better drug that possesses reduced toxic side effects while retaining therapeutic potency.
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Affiliation(s)
- Arnaldo X Torres Hernandez
- Department of Chemistry , Pontifical Catholic University of Puerto Rico , 2250 Boulevard Luis A. Ferré Aguayo, Suite 626 , Ponce , PR 00717-0777 , Puerto Rico.,Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
| | - Chamitha J Weeramange
- Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
| | - Prathibha Desman
- Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
| | - Anthony Fatino
- Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
| | - Olivia Haney
- Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
| | - Ryan J Rafferty
- Department of Chemistry , Kansas State University , 1212 Mid-Campus Drive North , Manhattan , KS 66506 , USA .
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29
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Luo Z, Liu T, Guo W, Wang Z, Huang J, Zhu Y, Zeng Z. N-Acyl-5,5-dimethylhydantoin, a New Mild Acyl-Transfer Reagent in Pd Catalysis: Highly Efficient Synthesis of Functionalized Ketones. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.8b00182] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Zhongfeng Luo
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
| | - Tingting Liu
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
| | - Weijie Guo
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
| | - Zijia Wang
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
| | - Jingjun Huang
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
- College of Arts and Sciences, University of Cincinnati, Cincinnati, Ohio 45221, United States
| | - Yulin Zhu
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
| | - Zhuo Zeng
- College of Chemistry and Environment, South China Normal University, Guangzhou 510006, People’s Republic of China
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, China
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30
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Mondal M, Begum T, Bharali P. Regioselective C–H and N–H functionalization of purine derivatives and analogues: a synthetic and mechanistic perspective. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01860j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This perspective provides a systematic and concise overview of the recent development in C–H/N–H bond functionalization in purine derivatives and analogues.
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Affiliation(s)
- Manoj Mondal
- Department of Chemical Sciences
- Tezpur University
- Tezpur-784028
- India
| | - Tahshina Begum
- Chemical Sciences & Technology Division
- CSIR-NEIST
- AcSIR
- Jorhat-785006
- India
| | - Pankaj Bharali
- Department of Chemical Sciences
- Tezpur University
- Tezpur-784028
- India
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