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Nakayama T, Fujiki S, Enda T, Kikkawa S, Hikawa H, Azumaya I. A sequential reaction of picolinamide with benzaldehydes promoted by Pd(TFA) 2: rapid access to 4,5-disubstituted 2-(pyridin-2-yl)oxazoles in n-octane. Org Biomol Chem 2024; 22:759-766. [PMID: 38168691 DOI: 10.1039/d3ob01815f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
We developed a synthetic method for obtaining 4,5-disubstituted 2-(pyridin-2-yl)oxazoles from picolinamide and aldehydes by employing Pd(TFA)2 as the catalyst in n-octane. This cascade reaction involves the condensation of picolinamide and two aldehyde molecules promoted by trifluoroacetic acid (TFA) generated in situ from Pd(TFA)2. This one-pot protocol provides rapid access to synthetically valuable triaryloxazoles from readily available starting materials under mild conditions. An 18O labeling study revealed that this tandem reaction proceeded via a different reaction mechanism compared to the Robinson-Gabriel oxazole synthesis.
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Affiliation(s)
- Taku Nakayama
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Sayaka Fujiki
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Tomokatsu Enda
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Shoko Kikkawa
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Hidemasa Hikawa
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
| | - Isao Azumaya
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
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Mazibuko M, Jeena V. Synthesis of 2,4,5-Trisubstituted Oxazoles from Copper-Mediated Benzylic sp 3 C-H Aerobic Oxidative Annulation of Ketones and Amines via a Cascade Reaction. J Org Chem 2023; 88:1227-1234. [PMID: 36575054 DOI: 10.1021/acs.joc.2c02148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The functionalization of sp3 carbons is deemed challenging in synthetic organic chemistry yet has tremendous potential in producing potent organic compounds. A facile synthesis of 2,4,5-trisubstituted oxazoles through an oxidative, copper-catalyzed, and solvent-free annulation is described. Various arylated oxazoles were efficaciously synthesized at a mild temperature from readily available substrates under a molecular oxygen atmosphere. Preliminary mechanistic studies suggested that the reaction proceeds via an anionic-type mechanism and indicated the formation of a keto-imine intermediate. The reaction is notable for the abstraction of six hydrogen atoms, the functionalization of one sp2 carbon and two sp3 carbons, and the formation of C-O and C-N bonds.
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Affiliation(s)
- Mncedisi Mazibuko
- School of Chemistry and Physics, University of KwaZulu-Natal, Scottsville, Pietermaritzburg 3209, South Africa
| | - Vineet Jeena
- School of Chemistry and Physics, University of KwaZulu-Natal, Scottsville, Pietermaritzburg 3209, South Africa
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Ishida H, Homma S, Kasuga R, Yamamoto K, Itoh T. Synthesis of Tetrahydrofuro[2,3-d]oxazoles and Oxazoles by Hypervalent Iodine (III)-Promoted [2 + 2 + 1] Annulation. Chem Pharm Bull (Tokyo) 2022; 70:192-194. [PMID: 35228383 DOI: 10.1248/cpb.c21-01001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Reaction of a hypervalent iodine reagent with bistriflimide efficiently promotes three-component regioselective cyclization of tetrahydrofuro[2,3-d]oxazoles and oxazoles from homopropargyl alcohols bearing a phenyl group, with different substituents on the aryl alkyne compounds affecting the selectivity of the resulting product. Utilizing the hydroxyethyl oxazole derivatives obtained in this research could aid in the development of various peroxisome proliferator-activated receptor agonist derivatives.
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Affiliation(s)
- Hiroaki Ishida
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University
| | - Shoya Homma
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University
| | - Ryota Kasuga
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University
| | - Keiko Yamamoto
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University
| | - Toshimasa Itoh
- Laboratory of Drug Design and Medicinal Chemistry, Showa Pharmaceutical University
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Basavaiah D, Golime G, Banoth S, Todeti S. An umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition of aryl aldehydes and nitriles: a facile access to 2,4,5-trisubstituted oxazoles. Chem Sci 2022; 13:8080-8087. [PMID: 35919435 PMCID: PMC9278343 DOI: 10.1039/d2sc00046f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 06/10/2022] [Indexed: 11/21/2022] Open
Abstract
We have described the first example of an umpolung strategy for intermolecular [2 + 2 + 1] cycloaddition between two aryl aldehydes and a nitrile under the influence of TMSOTf that proceeds through the formation of N–C, O–C and C–C bonds providing a simple synthetic protocol for obtaining 2,4,5-trisubstituted oxazoles. An unprecedented intermolecular [2 + 2 + 1] cycloaddition strategy between two aryl aldehydes and a nitrile, wherein one of the aryl aldehydes serves as a carbanion (or equivalent) in the presence of TMSOTf for obtaining oxazole framework is presented.![]()
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Affiliation(s)
- Deevi Basavaiah
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
| | | | - Shivalal Banoth
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
| | - Saidulu Todeti
- School of Chemistry, University of Hyderabad, Hyderabad-500046, India
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Kulkarni S, Kaur K, Jaitak V. Recent Developments in Oxazole Derivatives as Anticancer Agents: Review on Synthetic Strategies, Mechanism of Action and SAR studies. Anticancer Agents Med Chem 2021; 22:1859-1882. [PMID: 34525925 DOI: 10.2174/1871520621666210915095421] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 06/26/2021] [Accepted: 07/09/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Cancer is the world's third deadliest disease. Despite the availability of numerous treatments, researchers are focusing on the development of new drugs lacking resistance and toxicity issues. Many newly synthesized drugs fail to reach clinical trials due to poor pharmacokinetic properties. Therefore, there is an imperative requisite to expand novel anticancer agents with in vivo efficacy. OBJECTIVE This review emphasizes synthetic methods, contemporary strategies used for the inclusion of oxazole moiety, mechanistic targets along with comprehensive structure-activity relationship studies to provide perspective into the rational design of highly efficient oxazole-based anticancer drugs. METHODS Literature related to oxazole derivatives engaged in cancer research is reviewed. This article gives a detailed account of synthetic strategies, targets of oxazole in cancer, including STAT3, Microtubules, G-quadruplex, DNA topoisomerases, DNA damage, Protein kinases, miscellaneous targets, in vitro studies, and some SAR studies. RESULTS Oxazole derivatives possess potent anticancer activity by inhibiting novel targets such as STAT3 and G-quadruplex. Oxazoles also inhibit tubulin protein to induce apoptosis in cancer cells. Some other targets such as DNA topoisomerase enzyme, protein kinases, and miscellaneous targets including Cdc25, mitochondrial enzymes, HDAC, LSD1, HPV E2 TAD, NQO1, Aromatase, BCl-6, Estrogen receptor, GRP-78, and Keap-Nrf2 pathway are inhibited by oxazole derivatives Many derivatives showed excellent potencies on various cancer cell lines with IC50 values in nanomolar concentrations. CONCLUSION Oxazole is a five-membered heterocycle, with oxygen and nitrogen at 1 and 3 positions respectively. It is often combined with other pharmacophores in the expansion of novel anticancer drugs. In summary, oxazole is a promising entity to develop new anticancer drugs.
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Affiliation(s)
- Swanand Kulkarni
- Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda, 151 401. India
| | - Kamalpreet Kaur
- Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda, 151 401. India
| | - Vikas Jaitak
- Department of Pharmaceutical Sciences and Natural Products, Central University of Punjab, Ghudda, Bathinda, 151 401. India
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Liang F, Liu K, Zhao C, Shang Z, Kong H, Yin Y, Zhu Y, Sun Y, Yao J. Convergent Domino Cyclization: Oxidative [3+1+1] Annulation for One‐Pot Synthesis of 2‐Quinoline‐4,5‐diaryl‐oxazoles from Methyl Azaarenes, Benzoins and NH
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OAc. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001561] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Fei‐Fei Liang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Kai‐Xuan Liu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Cong Zhao
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Zhi‐Hao Shang
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Hong‐Mei Kong
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Ya‐Qing Yin
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Yan‐Ping Zhu
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Yuan‐Yuan Sun
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
| | - Jian‐Wen Yao
- School of Pharmacy, Key Laboratory of Molecular Pharmacology and Drug Evaluation, Ministry of Education Collaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of Shandong, Yantai University Shandong, Yantai 264005 P. R. China
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8
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Kumar SV, Acharya A, Ila H. Synthesis of 2,4,5-Trisubstituted Oxazoles with Complementary Regioselectivity from α-Oxoketene Dithioacetals and β-(Methylthio)-β-(het)aryl-2-propenones. J Org Chem 2018; 83:6607-6622. [DOI: 10.1021/acs.joc.8b00900] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Siripuram Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
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Thatha S, Ummadi N, Venkatapuram P, Adivireddy P. Synthesis, Characterization, and Antioxidant Activity of a New Class of Amido linked Azolyl Thiophenes. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3177] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sreenivasulu Thatha
- Department of Chemistry; Sri Venkateswara University; Tirupati 517 502 Andhra Pradesh India
| | - Nagarjuna Ummadi
- Department of Chemistry; Sri Venkateswara University; Tirupati 517 502 Andhra Pradesh India
| | | | - Padmaja Adivireddy
- Department of Chemistry; Sri Venkateswara University; Tirupati 517 502 Andhra Pradesh India
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Yagyu T, Takemoto Y, Yoshimura A, Zhdankin VV, Saito A. Iodine(III)-Catalyzed Formal [2 + 2 + 1] Cycloaddition Reaction for Metal-Free Construction of Oxazoles. Org Lett 2017; 19:2506-2509. [DOI: 10.1021/acs.orglett.7b00742] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuma Yagyu
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
| | - Yusuke Takemoto
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
| | - Akira Yoshimura
- Department
of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812 United States
| | - Viktor V. Zhdankin
- Department
of Chemistry and Biochemistry, University of Minnesota, Duluth, Minnesota 55812 United States
| | - Akio Saito
- Division
of Applied Chemistry, Institute of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan, and
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11
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Xing ZH, Zhuang JY, Xu XP, Ji SJ, Su WM, Cui Z. Novel oxazole-based emitters for high efficiency fluorescent OLEDs: Synthesis, characterization, and optoelectronic properties. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Ohura A, Itoh T, Ishida H, Saito A, Yamamoto K. Three-Component Regioselective Synthesis of Tetrahydrofuro[2,3-d]oxazoles and Their Efficient Conversion to Oxazoles. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700074] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Arisa Ohura
- Laboratory of Drug Design and Medicinal Chemistry; Showa Pharmaceutical University; 3-3165 Higashi-Tamagawagakuen, Machida Tokyo 194-8543 Japan
| | - Toshimasa Itoh
- Laboratory of Drug Design and Medicinal Chemistry; Showa Pharmaceutical University; 3-3165 Higashi-Tamagawagakuen, Machida Tokyo 194-8543 Japan
| | - Hiroaki Ishida
- Laboratory of Drug Design and Medicinal Chemistry; Showa Pharmaceutical University; 3-3165 Higashi-Tamagawagakuen, Machida Tokyo 194-8543 Japan
| | - Akio Saito
- Division of Applied Chemistry, Institute of Engineering; Tokyo University of Agriculture and Technology; 2-24-16 Naka-cho, Koganei Tokyo 184-8588 Japan
| | - Keiko Yamamoto
- Laboratory of Drug Design and Medicinal Chemistry; Showa Pharmaceutical University; 3-3165 Higashi-Tamagawagakuen, Machida Tokyo 194-8543 Japan
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Ibrar A, Khan I, Abbas N, Farooq U, Khan A. Transition-metal-free synthesis of oxazoles: valuable structural fragments in drug discovery. RSC Adv 2016. [DOI: 10.1039/c6ra19324b] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This review article encapsulates the recent developments in the metal-free approaches used to construct oxazole moiety.
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Affiliation(s)
- Aliya Ibrar
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Imtiaz Khan
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Naeem Abbas
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Umar Farooq
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Ajmal Khan
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
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