151
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Garzón M, Davies PW. A Direct Route into Fused Imidazo-diazines and Imidazo-pyridines Using Nucleophilic Nitrenoids in a Gold-Catalyzed Formal [3 + 2]-Dipolar Cycloaddition. Org Lett 2014; 16:4850-3. [DOI: 10.1021/ol502346d] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Miguel Garzón
- Haworth
Building, School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Paul W. Davies
- Haworth
Building, School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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152
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Santra S, Mitra S, Bagdi AK, Majee A, Hajra A. Iron(III)-catalyzed three-component domino strategy for the synthesis of imidazo[1,2-a]pyridines. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.07.094] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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153
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Subramanian P, Kaliappan KP. A Unified Strategy TowardsN-Aryl Heterocycles by a One-Pot Copper-Catalyzed Oxidative C-H Amination of Azoles. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402868] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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154
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Jansa J, Lyčka A, Padělková Z, Grepl M, Konečný P, Hajdúch M, Džubák P. New Imidazo[1,2-c]pyrimidin-5(6H)-Ones Derived from Cytosine: Synthesis, Structure, and Cytotoxic Activity. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Josef Jansa
- Research Institute for Organic Syntheses (VUOS); Rybitví 296 CZ-533 54 Pardubice-Rybitví Czech Republic
- Department of Organic Chemistry, Faculty of Science; Palacký University; 17. listopadu 1192/12 CZ-771 46 Olomouc Czech Republic
| | - Antonín Lyčka
- Research Institute for Organic Syntheses (VUOS); Rybitví 296 CZ-533 54 Pardubice-Rybitví Czech Republic
| | - Zdeňka Padělková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology; University of Pardubice; Studentská 573 CZ-532 10 Pardubice Czech Republic
| | - Martin Grepl
- Farmak, a.s.; Na Vlčinci 16/3 CZ-771 17 Olomouc Czech Republic
| | - Petr Konečný
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry; Palacký University, Olomouc; Puškinova 6 CZ-775 20 Olomouc Czech Republic
- University Hospital Olomouc; Ivana Petroviče Pavlova 6 CZ-77520 Olomouc Czech Republic
| | - Marián Hajdúch
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry; Palacký University, Olomouc; Puškinova 6 CZ-775 20 Olomouc Czech Republic
- University Hospital Olomouc; Ivana Petroviče Pavlova 6 CZ-77520 Olomouc Czech Republic
| | - Petr Džubák
- Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry; Palacký University, Olomouc; Puškinova 6 CZ-775 20 Olomouc Czech Republic
- University Hospital Olomouc; Ivana Petroviče Pavlova 6 CZ-77520 Olomouc Czech Republic
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155
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One-pot copper nanoparticle-catalyzed synthesis of imidazo[1,2-a]pyridines under solvent-free conditions. Chem Res Chin Univ 2014. [DOI: 10.1007/s40242-014-3520-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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156
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Kumar A, Kumar M, Maurya S, Khanna RS. Regioselective synthesis of fused imidazo[1,2-a]pyrimidines via intramolecular C-N bond formation/6-endo-dig cycloisomerization. J Org Chem 2014; 79:6905-12. [PMID: 24988318 DOI: 10.1021/jo5007762] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient regioselective cascade synthesis of N-fused imidazo heterocycles has been developed. This cascade transformation proceeds via a transition-metal (copper/silver) catalyzed coupling reaction between 2-aminobenzimidazole, aldehydes, and alkynes leading to the formation of propargylamine intermediate, which regioselectively undergoes 6-endo-dig cyclization through intramolecular N-H bond activation interceded C-N bond formation leading to highly functionalized imidazo[1,2-a]pyrimidines in good to excellent yields.
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Affiliation(s)
- Atul Kumar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute , Sector 10, Jankipuram Extension, Lucknow 226031 India
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157
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Koubachi J, El Kazzouli S, Bousmina M, Guillaumet G. Functionalization of Imidazo[1,2-a]pyridines by Means of Metal-Catalyzed Cross-Coupling Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400065] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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158
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Dylong A, Sowa M, Goldeman W, Ślepokura K, Duczmal M, Wojciechowska A, Matczak-Jon E. Imidazo[1,2-a]pyridin-2-ylacetic acid and two pairs of isomorphous ML2(H2O)2 dihydrates (M=Ni, Co and Mn, Cd) based on its anion: Syntheses, crystal structures and properties. Polyhedron 2014. [DOI: 10.1016/j.poly.2014.03.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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159
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Firmansyah D, Banasiewicz M, Deperasińska I, Makarewicz A, Kozankiewicz B, Gryko DT. Vertically π-Expanded Imidazo[1,2-a]pyridine: The Missing Link of the Puzzle. Chem Asian J 2014; 9:2483-93. [DOI: 10.1002/asia.201402201] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Indexed: 12/20/2022]
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160
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Gali R, Banothu J, Bavantula R. One-Pot Multicomponent Synthesis of Novel Substituted Imidazo[1,2-a]Pyridine Incorporated Thiazolyl Coumarins and their Antimicrobial Activity. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2116] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Rajitha Gali
- Department of Chemistry; National Institute of Technology; Warangal Andhra Pradesh India
| | - Janardhan Banothu
- Department of Chemistry; National Institute of Technology; Warangal Andhra Pradesh India
| | - Rajitha Bavantula
- Department of Chemistry; National Institute of Technology; Warangal Andhra Pradesh India
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161
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Puthiaraj P, Ramu A, Pitchumani K. Copper-Based Metal-Organic Frameworks as Reusable Heterogeneous Catalysts for the One-Pot Syntheses of Imidazo[1,2-a]pyridines. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201402019] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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162
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The behavioral pharmacology of zolpidem: evidence for the functional significance of α1-containing GABA(A) receptors. Psychopharmacology (Berl) 2014; 231:1865-96. [PMID: 24563183 DOI: 10.1007/s00213-014-3457-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 01/11/2014] [Indexed: 10/25/2022]
Abstract
RATIONALE Zolpidem is a positive allosteric modulator of γ-aminobutyric acid (GABA) with preferential binding affinity and efficacy for α1-subunit containing GABA(A) receptors (α1-GABA(A)Rs). Over the last three decades, a variety of animal models and experimental procedures have been used in an attempt to relate the behavioral profile of zolpidem and classic benzodiazepines (BZs) to their interaction with α1-GABA(A)Rs. OBJECTIVES This paper reviews the results of rodent and non-human primate studies that have evaluated the effects of zolpidem on motor behaviors, anxiety, memory, food and fluid intake, and electroencephalogram (EEG) sleep patterns. Also included are studies that examined zolpidem's discriminative, reinforcing, and anticonvulsant effects as well as behavioral signs of tolerance and withdrawal. RESULTS The literature reviewed indicates that α1-GABA(A)Rs play a principle role in mediating the hypothermic, ataxic-like, locomotor- and memory-impairing effects of zolpidem and BZs. Evidence also suggests that α1-GABA(A)Rs play partial roles in the hypnotic, EEG sleep, anticonvulsant effects, and anxiolytic-like of zolpidem and diazepam. These studies also indicate that α1-GABA(A)Rs play a more prominent role in mediating the discriminative stimulus, reinforcing, hyperphagic, and withdrawal effects of zolpidem and BZs in primates than in rodents. CONCLUSIONS The psychopharmacological data from both rodents and non-human primates suggest that zolpidem has a unique pharmacological profile when compared with classic BZs. The literature reviewed here provides an important framework for studying the role of different GABA(A)R subtypes in the behavioral effects of BZ-type drugs and helps guide the development of new pharmaceutical agents for disorders currently treated with BZ-type drugs.
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163
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Yan H, Wang Y, Pan C, Zhang H, Yang S, Ren X, Li J, Huang G. Iron(III)-Catalyzed Denitration Reaction: One-Pot Three-Component Synthesis of Imidazo[1,2-a]pyridine Derivatives. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301658] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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164
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Staner L, Danjou P, Luthringer R. A new sublingual formulation of zolpidem for the treatment of sleep-onset insomnia. Expert Rev Neurother 2014; 12:141-53. [DOI: 10.1586/ern.11.197] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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165
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Tajbakhsh M, Farhang M, Hosseinzadeh R, Sarrafi Y. Nano Fe3O4 supported biimidazole Cu(i) complex as a retrievable catalyst for the synthesis of imidazo[1,2-a]pyridines in aqueous medium. RSC Adv 2014. [DOI: 10.1039/c4ra03333g] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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166
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Zhan H, Zhao L, Li N, Chen L, Liu J, Liao J, Cao H. Ruthenium-catalyzed direct C-3 oxidative olefination of imidazo[1,2-a]pyridines. RSC Adv 2014. [DOI: 10.1039/c4ra04669b] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Ruthenium-catalyzed regioselective C-3 oxidative olefination of imidazo[1,2-a]pyridines.
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Affiliation(s)
- Haiying Zhan
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Limin Zhao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Naiying Li
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Longbin Chen
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Jingyun Liu
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Jinqiang Liao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
| | - Hua Cao
- School of Chemistry and Chemical Engineering
- Guangdong Pharmaceutical University
- Guangzhou 510006, P. R. China
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167
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Abel SAG, Eglinton MO, Howard JK, Hunt DJ, Prager RH, Smith JA. Synthesis of Heterocyclic-fused Imidazoles by Pyrolysis of N-Heterocyclic Isoxazol-5(2H)-ones. Aust J Chem 2014. [DOI: 10.1071/ch14119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The synthesis of heterocyclic-fused imidazoles was achieved by flash vacuum pyrolysis (FVP) of N-heterocyclic isoxazol-5(2H)-ones via an iminocarbene intermediate. Unlike iminocarbenes generated from triazoles, no structural rearrangements were observed during the current synthesis method. We also demonstrated that less volatile isoxazol-5(2H)-one derivatives yield the corresponding imidazoles by condensed phase pyrolysis.
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168
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Soares LK, Lara RG, Jacob RG, Lenardão EJ, Alves D, Perin G. Synthesis of (Z)-N-alkenyl-β-arylselanyl imidazoles via additive-free nucleophilic addition of imidazole to arylselanylalkynes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.12.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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169
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Pandey AK, Sharma R, Singh A, Shukla S, Srivastava K, Puri SK, Kumar B, Chauhan PMS. Synthesis of biologically active pyridoimidazole/imidazobenzothiazole annulated polyheterocycles using cyanuric chloride in water. RSC Adv 2014. [DOI: 10.1039/c4ra03415e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient and mild protocol for rapid access to N-fused polyheterocycles via Pictet–Spengler type 6-endo cyclization by cyanuric chloride in aqueous medium has been developed.
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Affiliation(s)
- Anand Kumar Pandey
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Rashmi Sharma
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Awantika Singh
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Sanjeev Shukla
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Kumkum Srivastava
- Division of Parasitology
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Sunil K. Puri
- Division of Parasitology
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Brijesh Kumar
- Sophisticated Analytical Instrument Facility
- CSIR-Central Drug Research Institute
- Lucknow, India
| | - Prem M. S. Chauhan
- Medicinal and Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow, India
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170
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Diem SJ, Ewing SK, Stone KL, Ancoli-Israel S, Redline S, Ensrud KE. Use of non-benzodiazepine sedative hypnotics and risk of falls in older men. ACTA ACUST UNITED AC 2014; 3:158. [PMID: 25587493 DOI: 10.4172/2167-7182.1000158] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND To ascertain whether use of non-benzodiazepine sedative-hypnotics is associated with risk of falls and compare this to risk of falls associated with use of benzodiazepines. METHODS Among 4450 community-dwelling men, aged 71 years and older, enrolled in the population-based prospective cohort study, Osteoporotic Fractures in Men (MrOS), use of nonbenzodiazepine sedative-hypnotics and benzodiazepines was assessed by interview and verified from medication containers at the third annual visit of the MrOS study. Falls in the subsequent one-year period were ascertained by tri-annual questionnaires and a computerized dictionary used to categorize type of medication. RESULTS In age-adjusted models, non-benzodiazepine sedative hypnotic use was associated with an increased risk of any falls (one or more falls) (RR 1.44, 95% CI 1.15, 1.81) and recurrent falls (2 or more falls) (RR 1.51, 95% CI 1.07, 2.14). Use of benzodiazepines was associated with a similar increase in age-adjusted risk of falling. Depressive symptoms, inability to stand from a chair, and instrumental activities of daily living (IADL) impairment modestly attenuated these associations. The association between non-benzodiazepine sedative-hypnotic use and falls was most pronounced among men without a history of falls in the previous year: in a multivariable model controlling for multiple potential confounders, the RR of any falls was 1.74 (95% CI 1.13, 2.68) in this subgroup. CONCLUSIONS Use of non-benzodiazepine sedative-hypnotics is associated with an increased risk of falls. Non-pharmacologic approaches to sleep disturbances may represent the safest approach to sleep difficulties in older adults.
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Affiliation(s)
- Susan J Diem
- Department of Medicine, University of Minnesota, Minneapolis, MN ; Division of Epidemiology & Community Health, University of Minnesota, Minneapolis, MN
| | - Susan K Ewing
- California Pacific Medical Center Research Institute, San Francisco, CA
| | - Katie L Stone
- California Pacific Medical Center Research Institute, San Francisco, CA
| | - Sonia Ancoli-Israel
- Departments of Psychiatry and Family & Preventive Medicine, University of California - San Diego, La Jolla, CA
| | | | - Kristine E Ensrud
- Department of Medicine, University of Minnesota, Minneapolis, MN ; Division of Epidemiology & Community Health, University of Minnesota, Minneapolis, MN ; Center for Chronic Disease Outcomes Research, Minneapolis VA Health Care System, Minneapolis, MN
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171
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Chen X, Zhu L, Fang L, Yan S, Lin J. Catalyst-free concise synthesis of imidazo[1,2-a]pyrrolo[3,4-e]pyridine derivatives. RSC Adv 2014. [DOI: 10.1039/c3ra45485a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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172
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Mortaz Hejri S, Faizi M, Babaeian M. Zolpidem-induced suicide attempt: a case report. Daru 2013; 21:77. [PMID: 24359886 PMCID: PMC3878174 DOI: 10.1186/2008-2231-21-77] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 09/16/2013] [Indexed: 11/10/2022] Open
Abstract
Zolpidem is a popular drug indicated for the short-term treatment of insomnia. Side effects are not uncommon with zolpidem. Herein we describe an Iranian 27-year-old man with no known mood disorder or neuropsychological disease who attempted suicide upon taking zolpidem. There are two interesting facts about this case: Firstly, the patient had not history of suicide attempt or thinking. Secondly, this case had experienced suicide ideation after taking 20 mg of zolpidem, suggesting a possible correlation between zolpidem psychological effects and dangerous psychological behaviors.
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Affiliation(s)
| | - Mehrdad Faizi
- Department of Pharmacology & Toxicology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Babaeian
- National Drugs and Poisons Information Center, Deputy of Food and Drug, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Pharmacognosy, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Vali-e-Asr Avenue, Niayesh Junction, P.O. Box: 14155–6153, Tehran, Iran
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173
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Abstract
The Z-drugs zolpidem, zopiclone, and zaleplon were hailed as the innovative hypnotics of the new millennium, an improvement to traditional benzodiazepines in the management of insomnia. Increasing reports of adverse events including bizarre behavior and falls in the elderly have prompted calls for caution and regulation. Z-drugs have significant hypnotic effects by reducing sleep latency and improving sleep quality, though duration of sleep may not be significantly increased. Z-drugs exert their effects through increased γ-aminobutyric acid (GABA) transmission at the same GABA-type A receptor as benzodiazepines. Their pharmacokinetics approach those of the ideal hypnotic with rapid onset within 30 min and short half-life (1-7 h). Zopiclone with the longest duration of action has the greatest residual effect, similar to short-acting benzodiazepines. Neuropsychiatric adverse events have been reported with zolpidem including hallucinations, amnesia, and parasomnia. Poisoning with Z-drugs involves predominantly sedation and coma with supportive management being adequate in the majority. Flumazenil has been reported to reverse sedation from all three Z-drugs. Deaths from Z-drugs are rare and more likely to occur with polydrug overdose. Z-drugs can be detected in blood, urine, oral fluid, and postmortem specimens, predominantly with liquid chromatography-mass spectrometry techniques. Zolpidem and zaleplon exhibit significant postmortem redistribution. Zaleplon with its ultra-short half-life has been detected in few clinical or forensic cases possibly due to assay unavailability, low frequency of use, and short window of detection. Though Z-drugs have improved pharmacokinetic profiles, their adverse effects, neuropsychiatric sequelae, and incidence of poisoning and death may prove to be similar to older hypnotics.
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Affiliation(s)
- Naren Gunja
- NSW Poisons Information Centre, The Children's Hospital at Westmead, Sydney, Australia.
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174
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Cao H, Liu X, Zhao L, Cen J, Lin J, Zhu Q, Fu M. One-Pot Regiospecific Synthesis of Imidazo[1,2-a]pyridines: A Novel, Metal-Free, Three-Component Reaction for the Formation of C–N, C–O, and C–S Bonds. Org Lett 2013; 16:146-9. [DOI: 10.1021/ol4031414] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Hua Cao
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
| | - Xiaohang Liu
- BASF Catalyst, 23800 Mercantile Road, Beachwood, Ohio 44124, United States
| | - Limin Zhao
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
| | - Jinghe Cen
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
| | - Jingxin Lin
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
| | - Qiuxia Zhu
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
| | - Minling Fu
- School
of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Guangzhou 510006, P.R. of China
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175
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Zhang Y, Chen Z, Wu W, Zhang Y, Su W. CuI-Catalyzed Aerobic Oxidative α-Aminaton Cyclization of Ketones to Access Aryl or Alkenyl-Substituted Imidazoheterocycles. J Org Chem 2013; 78:12494-504. [DOI: 10.1021/jo402134x] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yuanfei Zhang
- State
Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Zhengkai Chen
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Wenliang Wu
- State
Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Yuhong Zhang
- Department
of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Weiping Su
- State
Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
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176
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Yu J, Jin Y, Zhang H, Yang X, Fu H. Copper‐Catalyzed Aerobic Oxidative CH Functionalization of Substituted Pyridines: Synthesis of Imidazopyridine Derivatives. Chemistry 2013; 19:16804-8. [DOI: 10.1002/chem.201302737] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Revised: 08/28/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Jipan Yu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (P.R. China), Fax: (+86) 10‐62781695
| | - Yunhe Jin
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (P.R. China), Fax: (+86) 10‐62781695
| | - Hao Zhang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (P.R. China), Fax: (+86) 10‐62781695
| | - Xiaobo Yang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (P.R. China), Fax: (+86) 10‐62781695
| | - Hua Fu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084 (P.R. China), Fax: (+86) 10‐62781695
- Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057 (P.R. China)
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177
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Highly Emissive Luminogens Based on Imidazo[1,2-a]pyridine for Electroluminescent Applications. Chem Asian J 2013; 9:294-304. [DOI: 10.1002/asia.201301061] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 09/11/2013] [Indexed: 11/07/2022]
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178
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Chen YC. The Molecular Dynamic Simulation of Zolpidem Interaction with Gamma Aminobutyric Acid Type A Receptor. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200700093] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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179
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Cai ZJ, Wang SY, Ji SJ. Copper(I) Iodide/Boron Trifluoride Etherate-Cocatalyzed Aerobic Dehydrogenative Reactions Applied in the Synthesis of Substituted Heteroaromatic Imidazo[1,2-a]pyridines. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300333] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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180
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Ge W, Zhu X, Wei Y. Aerobic Multicomponent Tandem Synthesis of 3-Sulfenylimidazo[1,2-a]pyridines from Ketones, 2-Aminopyridines, and Disulfides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300905] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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181
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Li M, Li T, Zhao K, Wang M, Wen L. Application of FunctionalizedN,S-Ketene Acetals-Microwave-Assisted Three-Component Domino Reaction for Rapid Direct Access to Imidazo[1,2-a]pyridines. CHINESE J CHEM 2013. [DOI: 10.1002/cjoc.201300252] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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182
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Maiti B, Chanda K, Selvaraju M, Tseng CC, Sun CM. Multicomponent solvent-free synthesis of benzimidazolyl imidazo[1,2-a]-pyridine under microwave irradiation. ACS COMBINATORIAL SCIENCE 2013; 15:291-7. [PMID: 23590286 DOI: 10.1021/co400010y] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A novel one-pot, three-component reaction employing variously substituted benzimidazole-linked amino pyridines, aldehydes, and isonitriles catalyzed by scandium(III) triflate under solvent-free conditions were accomplished. This new synthetic methodology facilitates the rapid generation of intricate molecular frameworks in three-dimensional fashion leading to benzimidazole-imidazo[1,2-a] pyridines. This approach is envisioned as an environmentally benign process and a simple operation to the biological interesting compounds. The present synthetic sequence permits the introduction of three points of structural diversity to expand chemical space with high purity and excellent yields.
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Affiliation(s)
- Barnali Maiti
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Kaushik Chanda
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Manikandan Selvaraju
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chih-Chung Tseng
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
| | - Chung-Ming Sun
- Laboratory of Combinatorial Drug Design, Department
of Applied Chemistry, National Chiao-Tung University, Hsinchu 300-10, Taiwan
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183
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Santra S, Bagdi AK, Majee A, Hajra A. Iron(III)-Catalyzed Cascade Reaction between Nitroolefins and 2-Aminopyridines: Synthesis of Imidazo[1,2-a]pyridines and Easy Access towards Zolimidine. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201201112] [Citation(s) in RCA: 146] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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184
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Firmansyah D, Ciuciu AI, Hugues V, Blanchard-Desce M, Flamigni L, Gryko DT. Bright, Fluorescent Dyes Based on Imidazo[1,2-a]pyridines that are Capable of Two-Photon Absorption. Chem Asian J 2013; 8:1279-94. [DOI: 10.1002/asia.201300058] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Indexed: 01/25/2023]
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185
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Kazemi Movahed S, Dabiri M, Bazgir A. An Efficient One-Pot Four-Component Synthesis of Functionalized Imidazo[1,2-a]pyridines. Helv Chim Acta 2013. [DOI: 10.1002/hlca.201200231] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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186
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Greenblatt DJ, Legangneux E, Harmatz JS, Weinling E, Freeman J, Rice K, Zammit GK. Dynamics and Kinetics of a Modified-Release Formulation of Zolpidem: Comparison With Immediate-Release Standard Zolpidem and Placebo. J Clin Pharmacol 2013; 46:1469-80. [PMID: 17101746 DOI: 10.1177/0091270006293303] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Modified-release (MR) zolpidem was developed to maintain effective plasma concentrations during the 3- to 6-hour post-dosage interval, corresponding to the middle portion of the typical sleep interval. Modified-release zolpidem (12.5 mg), standard immediate-release (IR) zolpidem (10 mg), and placebo were compared in a double-blind, single-dose, 3-way crossover daytime study of healthy volunteers (n = 70 completers). Effect areas for electroencephalographic beta amplitude during 0 to 8 hours and 3 to 6 hours after dosage were greater for MR compared to IR (P < .001). The digit-symbol substitution test and sedation rating scales behaved similarly. MR and IR did not differ in effects at 8 hours post-dosage nor in halflife or clearance. Time of peak plasma concentration (tmax) was significantly longer for MR (2.4 vs 2.0 hours, P < .004), and dose-normalized peak plasma concentration (Cmax) was lower (12.2 vs 14.0 ng/mL/mg, P < .001). MR zolpidem also had greater area under the plasma concentration curve (AUC) during the 3- to 6-hour interval (P < .001). Thus, MR zolpidem produces sustained plasma levels compared to IR, with resulting enhancement of pharmacodynamic effects in the 3- to 6-hour post-dosage interval.
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Affiliation(s)
- David J Greenblatt
- Department of Pharmacology and Experimental Therapeutics, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA.
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187
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Vlase L, Popa A, Neag M, Muntean D, Bâldea I, Leucuta SE. Pharmacokinetic Interaction Between Zolpidem and Carbamazepine in Healthy Volunteers. J Clin Pharmacol 2013; 51:1233-6. [DOI: 10.1177/0091270010383690] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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188
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I2-promoted direct one-pot synthesis of 2-aryl-3-(pyridine-2-ylamino)imidazo[1,2-a]pyridines from aromatic ketones and 2-aminopyridines. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2012.12.072] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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189
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Kamal A, Ramakrishna G, Ramaiah MJ, Viswanath A, Rao AVS, Bagul C, Mukhopadyay D, Pushpavalli SNCVL, Pal-Bhadra M. Design, synthesis and biological evaluation of imidazo[1,5-a]pyridine–PBD conjugates as potential DNA-directed alkylating agents. MEDCHEMCOMM 2013. [DOI: 10.1039/c2md20219k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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190
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Shi Y, Xiang P, Shen B, Shen M. A rapid and accurate UPLC/MS/MS method for the simultaneous determination of zolpidem and its main metabolites in biological fluids and its application in a forensic context. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 911:140-6. [DOI: 10.1016/j.jchromb.2012.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 09/18/2012] [Accepted: 10/15/2012] [Indexed: 11/16/2022]
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191
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Sun H, Zhou H, Khorev O, Jiang R, Yu T, Wang X, Du Y, Ma Y, Meng T, Shen J. Three-Component, One-Pot Sequential Synthesis of Functionalized Cyclazines: 3H-1,2a1,3-Triazaacenaphthylenes. J Org Chem 2012; 77:10745-51. [DOI: 10.1021/jo3021105] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hongpeng Sun
- School of Chemistry and Pharmaceutical Engineering, Shandong Polytechnic University, Jinan 250353, P.R. China
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192
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Abstract
Zolpidem is a non-benzodiazepine hypnotic used in the short-term treatment of insomnia. A sublingual orally disintegrating tablet formulation of zolpidem (Edluar™; Sublinox™) has been developed to provide a more rapid onset of action than oral immediate-release zolpidem. Sublingual zolpidem has demonstrated bioequivalence to oral zolpidem. In a randomized, double-blind, double-dummy, crossover, multi-centre study in adult patients with primary insomnia (n = 70), a single 10-mg dose of sublingual zolpidem significantly reduced latency to persistent sleep (primary endpoint) compared with a single 10-mg dose of oral immediate-release zolpidem. Sleep-onset latency and latency to stage 1 sleep were also significantly shorter with sublingual zolpidem than with oral zolpidem. Moreover, compared with the oral formulation, sublingual zolpidem was noninferior in terms of total sleep time and did not significantly differ in terms of duration of wake after sleep onset. Sublingual zolpidem was generally well tolerated in this trial, with most adverse events being of mild or moderate severity. The overall tolerability profile of sublingual zolpidem was similar to that of oral zolpidem.
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Affiliation(s)
- Lily P H Yang
- Adis, Private Bag, Mairangi Bay, North Shore, Auckland, New Zealand.
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193
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Li M, Shao P, Wang SW, Kong W, Wen LR. Four-Component Cascade Heteroannulation of Heterocyclic Ketene Aminals: Synthesis of Functionalized Tetrahydroimidazo[1,2-a]pyridine Derivatives. J Org Chem 2012; 77:8956-67. [DOI: 10.1021/jo3013836] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ming Li
- State Key Laboratory Base of Eco-Chemical Engineering,
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042,
People's Republic of China
| | - Peng Shao
- State Key Laboratory Base of Eco-Chemical Engineering,
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042,
People's Republic of China
| | - Shu-Wen Wang
- State Key Laboratory Base of Eco-Chemical Engineering,
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042,
People's Republic of China
| | - Wei Kong
- State Key Laboratory Base of Eco-Chemical Engineering,
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042,
People's Republic of China
| | - Li-Rong Wen
- State Key Laboratory Base of Eco-Chemical Engineering,
College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042,
People's Republic of China
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194
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Shen M, Shi Y, Xiang P. CYP3A4 and CYP2C19 genetic polymorphisms and zolpidem metabolism in the Chinese Han population: a pilot study. Forensic Sci Int 2012; 227:77-81. [PMID: 22964165 DOI: 10.1016/j.forsciint.2012.08.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2012] [Revised: 08/03/2012] [Accepted: 08/17/2012] [Indexed: 10/27/2022]
Abstract
Zolpidem (ZPD) is an imidazopyridine hypnotic and little is known about the pharmacogenetics of ZPD. Our objective was to evaluate inter-individual genetic variation in conjunction with metabolic ratios of ZPD found in a toxicological analysis. Healthy individuals (n=300) were genotyped for CYP2D6, CYP2C19, CYP2C9, CYP3A4 and CYP1A2 by allele-specific primer extension followed by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS). Twenty-four Chinese volunteers were chosen and divided into the following four groups (n=6/group): group 1: CYP3A4*18 (wild-type, W), CYP2C19*2 (W); group 2: CYP3A4*18 (mutant, M), CYP2C19*2 (W); group 3: CYP3A4*18 (W), CYP2C19*2 (M); and group 4: CYP3A4*18 (M), CYP2C19*2 (M). ZPD and its major metabolites zolpidem 6-carboxylic acid (ZCA) and zolpidem phenyl-4-carboxylic acid (ZPCA) were determined after oral administration of ZPD (10mg), using an UPLC-MS/MS method. Positive correlations between CYP3A4 and CYP2C19 alleles and ZPD metabolism were found. The results of this study show that CYP3A4*18 increases CYP3A4 activity while CYP2C19*2 reduces CYP2C19 activity; the latter mutation is associated with the poor metabolism of ZPD in the Chinese Han population. The results also suggest that genetic factors play a major role in the metabolism of individual drugs with implications for both forensic science and clinical pharmacogenetics.
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Affiliation(s)
- Min Shen
- Shanghai Key Laboratory of Forensic Medicine, Department of Forensic Toxicology, Institute of Forensic Science, Ministry of Justice, Guangfu Xi Road 1347, Shanghai 200063, PR China.
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195
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Zeng J, Tan YJ, Leow ML, Liu XW. Copper(II)/iron(III) co-catalyzed intermolecular diamination of alkynes: facile synthesis of imidazopyridines. Org Lett 2012; 14:4386-9. [PMID: 22882116 DOI: 10.1021/ol301858j] [Citation(s) in RCA: 155] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A facile synthesis of imidazo[1,2-α]pyridines has been achieved by copper(II) and iron(III) co-catalyzed C-N bond formation. This reaction involves an intermolecular oxidative diamination of alkynes with high chemoselectivity and regioselectivity.
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Affiliation(s)
- Jing Zeng
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
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196
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Palani T, Park K, Kumar MR, Jung HM, Lee S. Copper-Catalyzed Decarboxylative Three-Component Reactions for the Synthesis of Imidazo[1,2-a]pyridines. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200679] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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197
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Li M, Cao H, Wang Y, Lv XL, Wen LR. One-Pot Multicomponent Cascade Reaction of N,S-Ketene Acetal: Solvent-Free Synthesis of Imidazo[1,2-a]thiochromeno[3,2-e]pyridines. Org Lett 2012; 14:3470-3. [PMID: 22734942 DOI: 10.1021/ol301441v] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Ming Li
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Han Cao
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Yong Wang
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Xiu-Liang Lv
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Li-Rong Wen
- State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
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198
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One-Pot Three-Component Synthesis of 3-nitro-2-arylimidazo[1,2-a]pyridine Derivatives Using Air as an Oxidant. Chem Asian J 2012; 7:2028-31. [DOI: 10.1002/asia.201200319] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2012] [Indexed: 01/30/2023]
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199
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Stasyuk AJ, Banasiewicz M, Cyrański MK, Gryko DT. Imidazo[1,2-a]pyridines susceptible to excited state intramolecular proton transfer: one-pot synthesis via an Ortoleva-King reaction. J Org Chem 2012; 77:5552-8. [PMID: 22662878 DOI: 10.1021/jo300643w] [Citation(s) in RCA: 252] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A short and efficient route to a broad range of imidazo[1,2-a]pyridines from 2-aminopyridines and acetophenones is achieved by a tandem, one-pot process starting with an Ortoleva-King reaction. Optimal conditions for the first step were established after examining various reaction parameters (solvent, reagent ratios, and temperature). The conditions identified (1st step, neat, 2.3 equiv of 2-aminopyridine, 1.20 equiv of I(2), 4 h, 110 °C; 2nd step, NaOH(aq), 1 h, 100 °C) resulted in the formation of imidazo[1,2-a]pyridines in 40-60% yields. The synthesis is compatible with various functionalities (OH, NMe(2), Br, OMe). Products containing a 2-(2'-hydroxyphenyl) substituent undergo excited state intramolecular proton transfer (ESIPT) in nonpolar and polar-aprotic solvents. Although ESIPT-type emission in nonpolar solvents is weak, the Stokes shifts are very high (11000 cm(-1)). The comparison of the properties of six ESIPT-capable imidazo[1,2-a]pyridines shows the influence of various substituents on emission characteristics. All of them also display strong, solid-state emission in blue-green-yellow region. 2-Aryl-imidazo[1,2-a]pyridines not capable of ESIPT emit in the blue region, displaying high fluorescence quantum yield.
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Affiliation(s)
- Anton J Stasyuk
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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200
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Guchhait SK, Chandgude AL, Priyadarshani G. CuSO4-glucose for in situ generation of controlled Cu(I)-Cu(II) bicatalysts: multicomponent reaction of heterocyclic azine and aldehyde with alkyne, and cycloisomerization toward synthesis of N-fused imidazoles. J Org Chem 2012; 77:4438-44. [PMID: 22486279 DOI: 10.1021/jo3003024] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The catalytic efficiency of mixed Cu(I)-Cu(II) system in situ generated by partial reduction of CuSO(4) with glucose in ethanol (nonanhydrous) under open air has been explored. With this catalysis, the multicomponent cascade reaction of A(3)-coupling of heterocyclic amidine with aldehyde and alkyne, 5-exo-dig cycloisomerization, and prototropic shift has afforded an efficient and eco-friendly synthesis of therapeutically important versatile N-fused imidazoles. Diverse heterocyclic amidines, several of which are known to be poorly reactive, and aldehydes are compatible in this catalytic process.
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Affiliation(s)
- Sankar K Guchhait
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, S. A. S. Nagar (Mohali), 160062, Punjab, India.
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