1
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Soni S, Sahiba N, Teli S, Teli P, Agarwal LK, Agarwal S. Advances in the synthetic strategies of benzoxazoles using 2-aminophenol as a precursor: an up-to-date review. RSC Adv 2023; 13:24093-24111. [PMID: 37577091 PMCID: PMC10416314 DOI: 10.1039/d3ra03871h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 08/02/2023] [Indexed: 08/15/2023] Open
Abstract
Benzoxazole is a resourceful and important member of the heteroarenes that connects synthetic organic chemistry to medicinal, pharmaceutical, and industrial areas. It is a bicyclic planar molecule and is the most favorable moiety for researchers because it has been extensively used as a starting material for different mechanistic approaches in drug discovery. The motif exhibits a high possibility of broad substrate scope and functionalization to offer several biological activities like anti-microbial, anti-fungal, anti-cancer, anti-oxidant, anti-inflammatory effects, and so on. There has been a large upsurge in the synthesis of benzoxazole via different pathways. The present article presents recent advances in synthetic strategies for benzoxazole derivatives since 2018. A variety of well-organized synthetic methodologies for benzoxazole using 2-aminophenol with aldehydes, ketones, acids, alcohols, isothiocyanates, ortho-esters, and alkynones under different reaction conditions and catalysts, viz. nanocatalysts, metal catalysts, and ionic liquid catalysts, with other miscellaneous techniques has been summarized.
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Affiliation(s)
- Shivani Soni
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
| | - Nusrat Sahiba
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
| | - Sunita Teli
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
| | - Pankaj Teli
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
| | - Lokesh Kumar Agarwal
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
| | - Shikha Agarwal
- Synthetic Organic Chemistry Laboratory, Department of Chemistry, MLSU Udaipur-313001 Rajasthan India
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2
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Naskar K, Karmakar S, Mondal I, Sarkar W, Roy S, Roy A, Deb I. Synthesis of indene-fused spiro-dibenz(ox)azepines via Rh(III)-catalyzed cascade regioselective C-H activation/annulation. Chem Commun (Camb) 2023. [PMID: 37129871 DOI: 10.1039/d3cc01416a] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We report an unprecedented atom-economic one-pot Cp*Rh(III)-catalyzed regioselective [3+2]-spiroannulation reaction between dibenz(ox)azepines and ynones, allowing the synthesis of biologically relevant novel spirocyclic dibenz(ox)azepines under operationally simple and mild reaction conditions. The reaction proceeds without any silver additive or external oxidant implementing a redox-neutral pathway. A broad substrate scope with diverse functional group tolerance permitted the regioselective synthesis of a wide spectrum of indene-containing spirocyclic dibenz(ox)azepines in good to excellent yields. Also, we showcased detailed mechanistic studies to justify the formation of spirocycles. In addition, the synthetic utility of this process was also demonstrated by the modular synthesis of various steroid conjugates.
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Affiliation(s)
- Koushik Naskar
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Sudip Karmakar
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Imtiaj Mondal
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Writhabrata Sarkar
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Shantonu Roy
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Anupam Roy
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
| | - Indubhusan Deb
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4-Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
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3
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Rapid and Simple Microwave-Assisted Synthesis of Benzoxazoles Catalyzed by [CholineCl][Oxalic Acid]. Catalysts 2022. [DOI: 10.3390/catal12111394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Microwave irradiation has been used to enhance the reaction yields and selectivities for organic transformation. In this paper, microwave irradiation (MW) was investigated for the environmentally benign synthesis of benzoxazoles through the cyclization of 2-aminophenols and benzaldehydes using deep eutectic solvent (DES) as a catalyst. The [CholineCl][oxalic acid] was easily synthesized from choline chloride with oxalic acid and used without further purification. [CholineCl][oxalic acid] catalyzed the synthesis of benzoxazoles to produce the desired product in a good to excellent conversion and selectivity under MW irradiation. The presence of [CholineCl][oxalic acid] helps to promote the rapid heating transfer from microwave irradiation into the reaction mixture. The [CholineCl][oxalic acid] can be recovered and reused several times without a considerable degradation in catalytic activity.
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4
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Guo Z, Li K, Li H, Wang X, Zhang J, Xie M. Acid‐Promoted Carbon‐Carbon Triple Bond Cleavage of Ynones for the Synthesis of Benzo[
d
]oxazoles/Benzo[
d
]thiazoles and 1‐Arylethan‐1‐ones. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zi‐Yi Guo
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
| | - Ke‐Ru Li
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
| | - Hang Li
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
| | - Xu Wang
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
| | - Ji‐Tan Zhang
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
| | - Mei‐Hua Xie
- Key Laboratory of Functional Molecular Solids (Ministry of Education) Anhui Key Laboratory of Molecular Based Materials College of Chemistry and Materials Science Anhui Normal University Wuhu 241002 China
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5
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Volkov PA, Khrapova KO, Bidusenko IA, Telezhkin AA, Schmidt EY, Albanov AI, Trofimov BA. Chemoselective cross-coupling of terminal propargylamines with (het)aroyl chlorides: synthesis of β-aminoacetylenic ketones bearing aromatic and heteroaromatic substituents. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3558-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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6
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Kumar V, Dhawan S, Bala R, Girase PS, Singh P, Karpoormath R. Metal-free direct annulation of 2-aminophenols and 2-aminothiophenols with unactivated amides through transamidation: Access to polysubstituted benzoxazole and benzothiazole derivatives. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132794] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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7
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The ultrasound-assisted synthesis of some novel fused-ring heterocyclic systems bearing structurally diverse benzazoles via a copper-catalyzed cross-coupling reaction. MONATSHEFTE FUR CHEMIE 2022. [DOI: 10.1007/s00706-022-02895-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Qiao X, Zhao YD, Rao M, Bu ZW, Zhang G, Xiong HY. Delivering 2-Aryl Benzoxazoles through Metal-Free and Redox-Neutral De-CF 3 Process. J Org Chem 2021; 86:13548-13558. [PMID: 34529441 DOI: 10.1021/acs.joc.1c01619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An unexpected cleavage of the Csp3-CF3 bond of CF3-hydrobenzoxazoles has been disclosed, affording a range of 2-aryl benzoxazoles under metal-free and redox-neutral conditions. This transformation has demonstrated broad substrate scope and good compatibility of functional groups. 2-Aryl benzothiazole and 2-aryl benzoimidazole could be smoothly assembled in the same manner. On the basis of preliminary mechanistic studies, base initiated and aromatization driven β-carbon elimination was considered to be the key step for the formation of 2. This reaction offers an alternative, facile, and sustainable route to access important 2-aryl benzoxazole motifs.
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Affiliation(s)
- Xinxin Qiao
- Institute of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China
| | - Yong-De Zhao
- Institute of Chemistry, Henan Academy of Sciences, Zhengzhou 450002, PR China
| | - Mingru Rao
- Institute of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China
| | - Zhan-Wei Bu
- Institute of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China
| | - Guangwu Zhang
- Institute of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China
| | - Heng-Ying Xiong
- Institute of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, PR China
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9
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Mondal A, Sharma R, Pal D, Srimani D. Recent Progress in the Synthesis of Heterocycles through Base Metal‐Catalyzed Acceptorless Dehydrogenative and Borrowing Hydrogen Approach. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100517] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Avijit Mondal
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Rahul Sharma
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Debjyoti Pal
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Dipankar Srimani
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
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10
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Chen F, Zhu C, Jiang H. [3+1+1] Annulation Reaction of Benzo‐1,2‐Quinones, Aldehydes and Hydroxylamine Hydrochloride: Access to Benzoxazoles with Inorganic Nitrogen Source. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001521] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Fulin Chen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 People's Republic of China
| | - Chuanle Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 People's Republic of China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 People's Republic of China
- State Key Laboratory of Applied Organic Chemistry (Lanzhou University) Lanzhou 730000 People's Republic of China
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11
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Xie Z, Lan J, Yan L, Chen X, Li Q, Meng J, Le Z. Photocatalyst-free visible-light-promoted quinazolinone synthesis at room temperature utilizing aldehydes generated in situ via C[double bond, length as m-dash]C bond cleavage. Org Biomol Chem 2021; 19:2436-2441. [PMID: 33406170 DOI: 10.1039/d0ob02268c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This is the first report on a facile tandem route for synthesizing quinazolinones at room temperature from various aminobenzamides and in situ-generated aldehydes. The latter was formed via C[double bond, length as m-dash]C bond cleavage, and the overall reaction proceeded using molecular oxygen as a clean oxidant in the absence of a photocatalyst. Visible light, which was indispensable for the entire course of the reaction, played multiple roles. It initially cleaved styrene to an aldehyde, then facilitated its cyclization with an o-substituted aniline, and finally promoted the dehydrogenation of the cyclized intermediate. The previous step provided the feedstock for the next step in the reaction, thereby preventing volatilization, oxidation, and polymerization of the aldehyde. Thus, the overall process is simple, environmentally benign, and economically feasible.
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Affiliation(s)
- Zongbo Xie
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang 330013, China.
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12
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Aboonajmi J, Sharghi H, Aberi M, Shiri P. Consecutive Oxidation/Condensation/Cyclization/Aromatization Sequences Catalyzed by Nanostructured Iron(III)‐Porphyrin Complex towards Benzoxazole Derivatives. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000999] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Jasem Aboonajmi
- Department of Chemistry College of Sciences Shiraz University 71454 Shiraz Iran
| | - Hashem Sharghi
- Department of Chemistry College of Sciences Shiraz University 71454 Shiraz Iran
| | - Mahdi Aberi
- Department of Chemical and Materials Engineering Faculty of Shahid Rajaee, Shiraz Branch Technical and Vocational University (TVU) Shiraz Iran
| | - Pezhman Shiri
- Department of Chemistry College of Sciences Shiraz University 71454 Shiraz Iran
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13
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Le HAN, Nguyen LH, Nguyen QNB, Nguyen HT, Nguyen KQ, Tran PH. Straightforward synthesis of benzoxazoles and benzothiazoles via photocatalytic radical cyclization of 2-substituted anilines with aldehydes. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.106120] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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14
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An Q, He C, Fan X, Hou C, Zhao J, Liu Y, Liu H, Ma J, Sun Z, Chu W. Synthesis of Benzazoles through Electrochemical Oxidative Cyclization Reactions. ChemElectroChem 2020. [DOI: 10.1002/celc.202000931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Qi An
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Chaoyin He
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Xiaodong Fan
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Chuanfu Hou
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Jian Zhao
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Yue Liu
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Hao Liu
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Junjie Ma
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Zhizhong Sun
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
| | - Wenyi Chu
- School of Chemistry and Materials Science Heilongjiang University Harbin 150080 P. R. China
- Key Laboratory of Chemical Engineering Process and Technology for High-efficiency Conversion College of Heilongjiang Province Harbin 150080 P. R. China
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15
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Sharghi H, Aboonajmi J, Aberi M. One-Pot Multicomponent Reaction of Catechols, Ammonium Acetate, and Aldehydes for the Synthesis of Benzoxazole Derivatives Using the Fe(III)-Salen Complex. J Org Chem 2020; 85:6567-6577. [PMID: 32326700 DOI: 10.1021/acs.joc.0c00560] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The Fe(III)-salen complex has been applied successfully as a catalyst for the novel, simple, efficient, and one-pot multicomponent synthesis of benzoxazole derivatives from catechols, ammonium acetate as the nitrogen source, and aldehydes (nontoxic and cheap alternatives of amines) for the first time. Using this procedure, a wide range of benzoxazoles was successfully synthesized in the presence of a catalyst in EtOH under mild conditions, and all products were obtained in excellent yields. To the best of our knowledge, this method is the first example of the multicomponent synthesis of benzoxazole derivatives using these starting materials. The notable features such as the use of air that is considered as a benign oxidant and EtOH as a green solvent, ease of product separation, readily available and inexpensive aldehydes, and mild conditions make our procedure more efficient and practical for organic synthesis. Moreover, the current protocol is successfully applied to synthesize desirable products on a large scale.
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Affiliation(s)
- Hashem Sharghi
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Jasem Aboonajmi
- Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran
| | - Mahdi Aberi
- Department of Chemical and Materials Engineering, Faculty of Shahid Rajaee, Shiraz Branch, Technical and Vocational University (TVU), Shiraz 71777, Iran
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16
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Sattar R, Mukhtar R, Atif M, Hasnain M, Irfan A. Synthetic transformations and biological screening of benzoxazole derivatives: A review. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.3944] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Rabia Sattar
- Department of ChemistryThe University of Lahore, Sargodha Campus Sargodha Pakistan
| | - Rubina Mukhtar
- Department of ChemistryThe University of Lahore, Sargodha Campus Sargodha Pakistan
| | - Muhammad Atif
- Department of ChemistryThe University of Lahore, Sargodha Campus Sargodha Pakistan
- Department of ChemistryUniversity of Agriculture Faisalabad Pakistan
| | - Muhammad Hasnain
- Department of ChemistryThe University of Lahore, Sargodha Campus Sargodha Pakistan
| | - Ali Irfan
- Department of ChemistryThe University of Lahore, Sargodha Campus Sargodha Pakistan
- Department of ChemistryGovernment College University Faisalabad Pakistan
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17
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Oshimoto K, Zhou B, Tsuji H, Kawatsura M. Synthesis of substituted benzo[b][1,4]oxazepine derivatives by the reaction of 2-aminophenols with alkynones. Org Biomol Chem 2020; 18:415-419. [DOI: 10.1039/c9ob02450f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We have developed a novel synthetic method accessing benzo[b][1,4]oxazepines that are one of the rare classes of benzoxazepine derivatives by reaction of 2-aminophenols with alkynones in 1,4-dioxane at 100 °C.
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Affiliation(s)
- Kohei Oshimoto
- Department of Chemistry
- College of Humanities & Sciences
- Nihon University
- Tokyo 156-8550
- Japan
| | - Biao Zhou
- Department of Chemistry
- College of Humanities & Sciences
- Nihon University
- Tokyo 156-8550
- Japan
| | - Hiroaki Tsuji
- Department of Chemistry
- College of Humanities & Sciences
- Nihon University
- Tokyo 156-8550
- Japan
| | - Motoi Kawatsura
- Department of Chemistry
- College of Humanities & Sciences
- Nihon University
- Tokyo 156-8550
- Japan
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18
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Ge B, Peng Y, Liu J, Wen S, Peng C, Cheng G. Acid-promoted cleavage of the C–C double bond of N-(2-Hydroxylphenyl)enaminones for the synthesis of benzoxazoles. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130818] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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