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Górecki S, Kudelko A. Synthesis and Characterization of Novel 2-Alkyl-1,3,4-Oxadiazoles Containing a Phenylazo Group. Molecules 2024; 29:4316. [PMID: 39339311 PMCID: PMC11433806 DOI: 10.3390/molecules29184316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2024] [Revised: 09/04/2024] [Accepted: 09/10/2024] [Indexed: 09/30/2024] Open
Abstract
An efficient method for the synthesis of novel phenylazo-containing moieties is described. The derivatives of 5-(4-(phenyldiazenyl)phenyl)-1,3,4-oxadiazole, substituted at position 2 of the heterocyclic scaffold with alkyl groups of different chain lengths, were prepared. The titled compounds were obtained using the appropriate 4-(5-alkyl-1,3,4-oxadiazol-2-yl)anilines, which were directed to diazotization and subsequently coupled to phenol, resorcinol, and N,N-dimethylaniline. Additionally, we report a mild and effective procedure for the preparation of 4-(5-alkyl-1,3,4-oxadiazol-2-yl)anilines via the selective reduction of the corresponding 2-alkyl-5-(4-nitrophenyl)-1,3,4-oxadiazoles using sodium borohydride-tin(II) chloride dihydrate as the reducing system. The chemical structures of the prepared compounds were confirmed by 1H- and 13C-NMR, IR, and UV-Vis spectroscopy.
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Affiliation(s)
- Sebastian Górecki
- Department of Chemical Organic Technology and Petrochemistry, The Silesian University of Technology, Krzywoustego 4, PL-44100 Gliwice, Poland
| | - Agnieszka Kudelko
- Department of Chemical Organic Technology and Petrochemistry, The Silesian University of Technology, Krzywoustego 4, PL-44100 Gliwice, Poland
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2
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Shetgaonkar SE, Jothish S, Dohi T, Singh FV. Iodine(V)-Based Oxidants in Oxidation Reactions. Molecules 2023; 28:5250. [PMID: 37446912 DOI: 10.3390/molecules28135250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 07/04/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023] Open
Abstract
The chemistry of hypervalent iodine reagents has now become quite valuable due to the reactivity of these compounds under mild reaction conditions and their resemblance in chemical properties to transition metals. The environmentally friendly nature of these reagents makes them suitable for Green Chemistry. Reagents with a dual nature, such as iodine(III) reagents, are capable electrophiles, while iodine(V) reagents are known for their strong oxidant behavior. Various iodine(V) reagents including IBX and DMP have been used as oxidants in organic synthesis either in stoichiometric or in catalytic amounts. In this review article, we describe various oxidation reactions induced by iodine(V) reagents reported in the past decade.
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Affiliation(s)
- Samata E Shetgaonkar
- School of Chemical Sciences, Goa University, Taleigao Plateau 403206, Goa, India
| | - Subhiksha Jothish
- Chemistry Division, School of Advanced Sciences (SAS), Vellore Institute of Technology, Chennai 600127, Tamil Nadu, India
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu 525-0058, Shiga, Japan
| | - Fateh V Singh
- Chemistry Division, School of Advanced Sciences (SAS), Vellore Institute of Technology, Chennai 600127, Tamil Nadu, India
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3
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Lim JH, Baek SE, Lad BS, Kim J. Synthesis of 2-Imino-1,3,4-oxadiazolines from Acylhydrazides and Isothiocyanates via Aerobic Oxidation and a DMAP-Mediated Annulation Sequence. ACS OMEGA 2022; 7:28148-28159. [PMID: 35990423 PMCID: PMC9386851 DOI: 10.1021/acsomega.2c02323] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 07/18/2022] [Indexed: 05/27/2023]
Abstract
In this work, an efficient synthesis of 2-imino-1,3,4-oxadiazolines from acylhydrazides and isothiocyanates is described. In the presence of 4-dimethylaminopyridine (DMAP) and molecular oxygen, various 2-imino-1,3,4-oxadiazolines were produced in good to high yields. The developed method showed a broad substrate scope and was effective on the gram scale. On the basis of the mechanistic studies and previous literature, it was proposed that the mechanism consists of an aerobic oxidation of acylhydrazides facilitated by DMAP and isothiocyanates, followed by a DMAP-mediated annulation of the in situ generated acyldiazenes with isothiocyanates.
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Synthesis and Biological Activity of 1,3,4-Oxadiazoles Used in Medicine and Agriculture. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12083756] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Biologically active compounds play a key role in the fight against diseases affecting both human and animal living organisms, as well as plants. Finding out about new molecules with a potential biological effect, not yet described in the literature, is one of the most important aspects in the development of medicine and agriculture. Compounds showing desirable biological activity include heterocyclic moieties such as 1,3,4-oxadiazoles. The oxadiazole molecule is composed of two nitrogen atoms and one oxygen atom, forming a five-membered heterocyclic ring. Structures of this type have been successfully used in the treatment of various diseases in humans and animals, and play an important role in modern agriculture. It has been proven that many oxadiazole derivatives exhibit antibacterial, antiviral, blood pressure lowering, antifungal, antineoplastic, anticancer, antioxidant, anti-inflammatory and analgesic properties. In addition, compounds based on 1,3,4-oxadiazole can act as plant protection agents due to their herbicidal, insecticidal and fungicidal activity. Due to the constantly growing interest in heterocyclic systems of this nature, new methods of obtaining complex structures containing oxadiazole rings are sought. This article discusses various methods of synthesis of 1,3,4-oxadiazole derivatives exhibiting biological activity. Based on these techniques, these compounds could be used in the future in medicine and agriculture.
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Venkata Durga Nageswar Y, Ramesh K, Rakhi K. IBX-Mediated Organic Transformations in Heterocyclic Chemistry-A Decade Update. Front Chem 2022; 10:841751. [PMID: 35295969 PMCID: PMC8919869 DOI: 10.3389/fchem.2022.841751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 01/11/2022] [Indexed: 11/22/2022] Open
Abstract
O-Iodoxybenzoic acid (IBX) is a very mild and efficient hypervalent iodine synthetic reagent useful to carry out several selective oxidations. The present review highlights research reports on IBX-assisted transformations in heterocyclic derivatives, particularly from 2010 onward.
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Affiliation(s)
| | - Katla Ramesh
- Organic Chemistry Laboratory, Foreign Visiting Professor, School of Chemistry and Food, Federal University of Rio Grande-FURG, Rio Grande, Brazil
| | - Katla Rakhi
- Organic Catalysis and Biocatalysis Laboratory-LACOB, Federal University of Grande Dourados-UFGD, Dourados, Brazil
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6
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Long B, Tian B, Tang Q, Hu X, Han L, Wang Z, Wang C, Wu Y, Yu Y, Gan Z. A KHSO4 mediated facile synthesis of 2-amino-1,3,4-oxadiazole derivatives. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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7
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Pham EC, Truong TN, Dong NH, Vo DD, Hong Do TT. Synthesis of a Series of Novel 2-Amino-5-Substituted 1,3,4-oxadiazole and 1,3,4-thiadiazole Derivatives as Potential Anticancer, Antifungal and Antibacterial Agents. Med Chem 2021; 18:558-573. [PMID: 34344293 DOI: 10.2174/1573406417666210803170637] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 04/24/2021] [Accepted: 04/25/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Many compounds containing a five-membered heterocyclic ring display exceptional chemical properties and versatile biological activities. OBJECTIVE The objective of the present study was the desire to prepare the 5-substituted 2-amino-1,3,4-oxadiazole and 2-amino-1,3,4-thiadiazole derivatives and evaluate their potential anticancer, antibacterial and antifungal activities. METHODS Twenty-seven derivatives were synthesized by iodine-mediated cyclization of semicarbazones or thiosemicarbazones obtained from condensation of semicarbazide or thiosemicarbazide and aldehydes. The structures were confirmed by 1H-NMR, 13C-NMR and MS spectra. The antibacterial and antifungal activities were evaluated by diffusion method and the anticancer activities were evaluated by MTT assay. RESULTS Twenty-seven derivatives have been synthesized in moderate to good yields. A number of derivatives exhibited potential antibacterial, antifungal and anticancer activities. CONCLUSION Compounds (1b, 1e and 1g) showed antibacterial activity against Streptococcus faecalis, MSSA and MRSA with MIC ranging between 4 to 64 µg/mL. Compound (2g) showed antifungal activity against Candida albicans (8 µg/mL) and Aspergillus niger (64 µg/mL). Compound (1o) exhibited high cytotoxic activity against HepG2 cell line (IC50 value 8.6 µM), which is comparable to the activity of paclitaxel, and is non-toxic on LLC-PK1 normal cell line. The structure activity relationship and molecular docking study of the synthesized compounds are also reported.
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Affiliation(s)
- Em Canh Pham
- Department of Organic Chemistry, Faculty of Pharmacy, University of Medicine and Pharmacy at Ho Chi Minh city, 700000 Ho Chi Minh city. Vietnam
| | - Tuyen Ngoc Truong
- Department of Organic Chemistry, Faculty of Pharmacy, University of Medicine and Pharmacy at Ho Chi Minh city, 700000 Ho Chi Minh city. Vietnam
| | - Nguyen Hanh Dong
- Department of Organic Chemistry, Faculty of Pharmacy, University of Medicine and Pharmacy at Ho Chi Minh city, 700000 Ho Chi Minh city. Vietnam
| | - Duy Duc Vo
- Department of Chemistry, and Department of Cell and Molecular Biology, Uppsala University, Uppsala city. Sweden
| | - Tuoi Thi Hong Do
- Department of Pharmacology, Faculty of Pharmacy, University of Medicine and Pharmacy at Ho Chi Minh city, 700000 Ho Chi Minh city. Vietnam
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Kadagathur M, Shaikh AS, Jadhav GS, Sigalapalli DK, Shankaraiah N, Tangellamudi ND. Cyclodesulfurization: An Enabling Protocol for Synthesis of Various Heterocycles. ChemistrySelect 2021. [DOI: 10.1002/slct.202100201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Manasa Kadagathur
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Arbaz Sujat Shaikh
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Govinda Shivaji Jadhav
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Dilep Kumar Sigalapalli
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Nagula Shankaraiah
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Neelima D. Tangellamudi
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
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9
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Kumar Sigalapalli D, Kadagathur M, Sujat Shaikh A, Jadhav GS, Bakchi B, Nagendra Babu B, Tangellamudi ND. Microwave‐Assisted TBHP‐Mediated Synthesis of 2‐Amino‐1,3,4‐oxadiazoles in Water. ChemistrySelect 2020. [DOI: 10.1002/slct.202003516] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dilep Kumar Sigalapalli
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Manasa Kadagathur
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Arbaz Sujat Shaikh
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Govinda S. Jadhav
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Bulti Bakchi
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
| | - Bathini Nagendra Babu
- Department of Fluoro-Agrochemicals CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India
| | - Neelima D. Tangellamudi
- Department of Medicinal Chemistry National Institute of Pharmaceutical Education and Research (NIPER) Hyderabad 500037 India
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10
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Synthesis, antimicrobial and antioxidant evaluation, and molecular docking study of 4,5-disubstituted 1,2,4-triazole-3-thiones. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128273] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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11
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Jiang Q, Qi X, Zhang C, Ji X, Li J, Liu R. Oxidant- and hydrogen acceptor-free palladium catalyzed dehydrogenative cyclization of acylhydrazones to substituted oxadiazoles. Org Chem Front 2018. [DOI: 10.1039/c7qo00749c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
An efficient method for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles has been developed through palladium(0) catalyzed dehydrogenative cyclization ofN-arylidenearoylhydrazides without oxidants and hydrogen acceptors.
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Affiliation(s)
- Qiangqiang Jiang
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Xinghui Qi
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Chenyang Zhang
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Xuan Ji
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Jin Li
- China Catalyst Holding Co
- Ltd
- Dalian 116699
- China
| | - Renhua Liu
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
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12
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Golmohammadi F, Balalaie S, Hamdan F, Maghari S. Efficient synthesis of novel conjugated 1,3,4-oxadiazole–peptides. NEW J CHEM 2018. [DOI: 10.1039/c7nj04720g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
In this study, we developed an efficient approach for the synthesis of 2-amino-1,3,4-oxadiazoles that are bioisosteres of the amide functional group. The synthesized oxadiazoles were conjugated to octa- and nonapeptides through the C- or N-terminus as precursors of leuprolide acetate. The synthesized compounds are peptidomimetics of leuprolide acetate.
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Affiliation(s)
- Farhad Golmohammadi
- Peptide Chemistry Research Center
- K. N. Toosi University of Technology
- Tehran
- Iran
| | - Saeed Balalaie
- Peptide Chemistry Research Center
- K. N. Toosi University of Technology
- Tehran
- Iran
- Medical Biology Research Center
| | - Fatima Hamdan
- Peptide Chemistry Research Center
- K. N. Toosi University of Technology
- Tehran
- Iran
| | - Shokoofeh Maghari
- Peptide Chemistry Research Center
- K. N. Toosi University of Technology
- Tehran
- Iran
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13
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Prabhu G, Santhosh L, Nagendra G, Panduranga V, Sureshbabu VV. Molecular-Iodine-Mediated, Efficient One-Pot Synthesis of 2-Iminohydantoins and 2-Amino-1H-imidazol-4(5H)-ones by Cyclodeselenization of Selenourea-Tethered Amides/Peptides. ChemistrySelect 2017. [DOI: 10.1002/slct.201601858] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Girish Prabhu
- Department of Studies in Chemistry; Central College Campus; Bangalore University, Dr. B. R. Ambedkar Veedhi; Bangalore 560001 India
| | - L. Santhosh
- Department of Studies in Chemistry; Central College Campus; Bangalore University, Dr. B. R. Ambedkar Veedhi; Bangalore 560001 India
| | - G. Nagendra
- Department of Studies in Chemistry; Central College Campus; Bangalore University, Dr. B. R. Ambedkar Veedhi; Bangalore 560001 India
| | - Veladi Panduranga
- Department of Studies in Chemistry; Central College Campus; Bangalore University, Dr. B. R. Ambedkar Veedhi; Bangalore 560001 India
| | - Vommina V. Sureshbabu
- Department of Studies in Chemistry; Central College Campus; Bangalore University, Dr. B. R. Ambedkar Veedhi; Bangalore 560001 India
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14
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Santhosh L, Srinivasulu C, Durgamma S, Prabhu G, Sureshbabu VV. Facile one-pot synthesis of 2-amino-1,3,4-oxadiazole tethered peptidomimetics by molecular-iodine-mediated cyclodeselenization. NEW J CHEM 2017. [DOI: 10.1039/c7nj02278f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Mild and highly efficient I2 and Et3N aided cyclodeselenization of in situ generated selenosemicarbazide is described to obtain 2-amino-1,3,4-oxadiazole peptidomimetics.
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Affiliation(s)
- L. Santhosh
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. AmbedkarVeedhi
- Bangalore University
| | - C. Srinivasulu
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. AmbedkarVeedhi
- Bangalore University
| | - S. Durgamma
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. AmbedkarVeedhi
- Bangalore University
| | - Girish Prabhu
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. AmbedkarVeedhi
- Bangalore University
| | - Vommina V. Sureshbabu
- Peptide Research Laboratory
- Department of Studies in Chemistry
- Central College Campus
- Dr B. R. AmbedkarVeedhi
- Bangalore University
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15
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Synthesis and antimicrobial evaluation of novel 4-amino-6-(1,3,4-oxadiazolo/1,3,4-thiadiazolo)-pyrimidine derivatives. Mol Divers 2015; 20:391-8. [DOI: 10.1007/s11030-015-9640-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2015] [Accepted: 10/10/2015] [Indexed: 10/22/2022]
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16
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Oxidative cyclization of N-aroylhydrazones to 2-(2-arylethenyl)-1,3,4-oxadiazoles using DDQ as an efficient oxidant. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.09.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Niu P, Kang J, Tian X, Song L, Liu H, Wu J, Yu W, Chang J. Synthesis of 2-amino-1,3,4-oxadiazoles and 2-amino-1,3,4-thiadiazoles via sequential condensation and I2-mediated oxidative C–O/C–S bond formation. J Org Chem 2015; 80:1018-24. [PMID: 25506709 DOI: 10.1021/jo502518c] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
2-Amino-substituted 1,3,4-oxadiazoles and 1,3,4-thiadiazoles were synthesized via condensation of semicarbazide/thiosemicarbazide and the corresponding aldehydes followed by I2-mediated oxidative C–O/C–S bond formation. This transition-metal-free sequential synthesis process is compatible with aromatic, aliphatic, and cinnamic aldehydes, providing facile access to a variety of diazole derivatives bearing a 2-amino substituent in an efficient and scalable fashion.
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18
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Study on the synthesis of novel 5-substituted 2-[2-(pyridyl)ethenyl]-1,3,4-oxadiazoles and their acid-base interactions. MONATSHEFTE FUR CHEMIE 2015; 146:303-311. [PMID: 26166897 PMCID: PMC4495023 DOI: 10.1007/s00706-014-1355-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 11/10/2014] [Indexed: 01/05/2023]
Abstract
Abstract A series of novel 5-substituted 2-[2-(pyridyl)ethenyl]-1,3,4-oxadiazoles were efficiently synthesized by cyclocondensation of the appropriate 3-(pyridyl)acrylohydrazides with triethyl orthoesters in the presence of glacial acetic acid. The products were identified by means of spectroscopic methods and their pKA ionization constants were determined. The influence of substituents on the basicity of the pyridine system has been discussed. Graphical Abstract ![]() ![]()
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19
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Krishnamurthy M, Basavaprabhu, Sharanabai K, Sureshbabu VV. A facile route for the synthesis of novel S-linked 1,3,5-triazine tethered peptidomimetics. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.08.075] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Madhu C, Prabhu G, Pal R, Guru Row TN, Sureshbabu VV. Synthesis of Optically Active 2-Amino-1,3,4-oxadiazoles and their Hybrid Peptides. J Heterocycl Chem 2014. [DOI: 10.1002/jhet.2166] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Chilakapati Madhu
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus; Bangalore University; Dr. B. R. Ambedkar Veedhi Bangalore 560 001 India
| | - Girish Prabhu
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus; Bangalore University; Dr. B. R. Ambedkar Veedhi Bangalore 560 001 India
| | - Rumpa Pal
- Solid State and Structural Chemistry Unit; Indian Institute of Science; Bangalore 560012 India
| | - T. N. Guru Row
- Solid State and Structural Chemistry Unit; Indian Institute of Science; Bangalore 560012 India
| | - Vommina V. Sureshbabu
- Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus; Bangalore University; Dr. B. R. Ambedkar Veedhi Bangalore 560 001 India
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21
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Abdel-Aziz HA, Bhat MA, Ghazzali M. Cyclodesulfurization of Substituted Thiosemicarbazides into 1,3,4-Oxadiazoles via Hydrazonoyl Chlorides. PHOSPHORUS SULFUR 2014. [DOI: 10.1080/10426507.2013.858252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Hatem A. Abdel-Aziz
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
- Department of Applied Organic Chemistry, National Research Center, Dokki, Cairo 12622, Egypt
| | - Mashooq A. Bhat
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - Mohamed Ghazzali
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
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22
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Fang T, Tan Q, Ding Z, Liu B, Xu B. Pd-catalyzed oxidative annulation of hydrazides with isocyanides: synthesis of 2-amino-1,3,4-oxadiazoles. Org Lett 2014; 16:2342-5. [PMID: 24725151 DOI: 10.1021/ol5006449] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An efficient palladium-catalyzed oxidative annulation reaction was developed through sequential isocyanide insertions into N-H and O-H bonds of hydrazides, which provides an efficient access to valuable 2-amino-1,3,4-oxadiazoles and their derivatives.
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Affiliation(s)
- Tao Fang
- Department of Chemistry, Innovative Drug Research Center, Shanghai University , Shanghai 200444, China
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23
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Majji G, Rout SK, Guin S, Gogoi A, Patel BK. Iodine-catalysed oxidative cyclisation of acylhydrazones to 2,5-substituted 1,3,4-oxadiazoles. RSC Adv 2014. [DOI: 10.1039/c3ra44897e] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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24
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Guda DR, Cho HM, Lee ME. Mild and convenient one-pot synthesis of 2-amino-1,3,4-oxadiazoles promoted by trimethylsilyl isothiocyanate (TMSNCS). RSC Adv 2013. [DOI: 10.1039/c3ra41044g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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Shinde VN, Ugarkar BG, Ghorpade SR. A Convenient Synthesis of 5-substituted 2-amino-1,3,4-oxadiazoles from Corresponding Acylthiosemicarbazides Using iodine and Oxone®. JOURNAL OF CHEMICAL RESEARCH 2013. [DOI: 10.3184/174751912x13551638283701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A convenient methodology has been developed for the synthesis of substituted 2-amino-1,3,4-oxadiazoles from corresponding acylthiosemicarbazides using catalytic amount of iodine/KI in the presence of Oxone® as a bulk oxidant. This offers the advantage of short reaction times and substrate variability which is suitable for the rapid production of analogues required for lead optimisation programmes. The method could also be useful for large-scale synthesis because of the mild reaction conditions and the use commercially inexpensive and safe reagents.
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Affiliation(s)
- Vikas N. Shinde
- AstraZeneca India Pvt. Ltd, Bellary Road, Hebbal, Bangalore 560024, Karnataka, India
| | - Bheemarao G. Ugarkar
- AstraZeneca India Pvt. Ltd, Bellary Road, Hebbal, Bangalore 560024, Karnataka, India
| | - Sandeep R. Ghorpade
- AstraZeneca India Pvt. Ltd, Bellary Road, Hebbal, Bangalore 560024, Karnataka, India
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