1
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Bagherinejad A, Alizadeh A. A review of the synthetic strategies toward spirobarbiturate-fused 3- to 7-membered rings. Org Biomol Chem 2022; 20:7188-7215. [PMID: 36070341 DOI: 10.1039/d2ob01326f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spiro-connected hexahydropyrimidine-2,4,6-trione heterocyclic rings have received increasing attention from the viewpoint of biological activity and synthetic methods due to the importance of the rigid heterocyclic system and unique orientation of the functional substituents. Since 1900, numerous studies have exploited the synthesis of various spirobarbiturate-fused carbo- and heterocycles by applying different strategies. Due to the importance of barbiturate-based olefins as activated alkenes, these substrates have been utilized in many reactions. In addition, the nucleophilic addition of 1,3-disubstituted barbituric acid to different electrophiles has been applied to prepare highly functionalized spirobarbiturate scaffolds. This short review highlights various strategies for synthesizing spirobarbiturate-fused 3- to 7-membered carbo- and heterocyclic rings and some catalytic diastereoselective and enantioselective chemical reactions to access chiral compounds. The sections are divided by the incorporation of 3- to 7-membered heterocyclic or carbocyclic rings into a spirobarbiturate scaffold, and are presented in different subsections depending on the mechanistic details.
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Affiliation(s)
- Akram Bagherinejad
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
| | - Abdolali Alizadeh
- Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
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2
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Marques CS, Carreiro EP, Teixeira APS. Multicomponent Synthesis of Heterocycles. HETEROCYCLES 2022. [DOI: 10.1002/9783527832002.ch7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Banerjee B, Kaur G. Microwave Assisted Catalyst-free Synthesis of Bioactive Heterocycles. CURRENT MICROWAVE CHEMISTRY 2020. [DOI: 10.2174/2213335607666200226102010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This review deals with the recent advances on the microwave-assisted synthesis of bioactive heterocycles without using any catalyst under various reaction conditions. Synthesis of various biologically promising N-heterocycles, O-heterocycles, S-heterocycles, N as well as O- or S-heterocycles reported so far under catalyst-free microwave-irradiated conditions are discussed in this review.
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Affiliation(s)
- Bubun Banerjee
- Department of Chemistry, Indus International University, V.P.O. Bathu, Distt. Una, Himachal Pradesh 174301, India
| | - Gurpreet Kaur
- Department of Chemistry, Indus International University, V.P.O. Bathu, Distt. Una, Himachal Pradesh 174301, India
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4
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Das S, Banik R, Kumar B, Roy S, Noorussabah, Amhad K, Sukul PK. A Green Approach for Organic Transformations Using Microwave Reactor. Curr Org Synth 2020; 16:730-764. [PMID: 31984890 DOI: 10.2174/1570179416666190412160048] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 03/06/2019] [Accepted: 03/14/2019] [Indexed: 02/07/2023]
Abstract
Microwave-assisted organic transformation (MAOR) is presently gaining wide popularity in the field of organic synthesis. The conventional heating technique is gradually being removed from the laboratory and a novel microwave heating technique established to be used in both academia and industry. As compared to the classical organic methodology, the green technology tools have several advantages like dramatically reduced reaction times, improved yields, site selectivity, and the increased product purities with simplification of work-up procedures. In the current study, we have briefly described the overview of recent developments and applications of microwave irradiation in organic transformation with schematic compiling of the organic reactions, bioactive heterocyclic compounds, and so on. This review also presents a critical analysis of the various advantages of microwave irradiation in organic synthesis/transformation compared to the classical or conventional heating. So, we believe that our current study of the green microwave heating technique will be highly beneficial for the researchers from both academia and industry in their near future.
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Affiliation(s)
- Subrata Das
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Rupak Banik
- Department of Chemistry, National Institute of Technology Agartala 799046, India
| | - Brajesh Kumar
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Subhadip Roy
- Department of Chemistry, National Institute of Technology Agartala 799046, India
| | - Noorussabah
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Khursheed Amhad
- Department of Chemistry, National Institute of Technology, Panta 800005, India
| | - Pradip K Sukul
- Department of Chemistry, National Institute of Technology, Panta 800005, India
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5
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Patel DM, Patel HJ, Padrón JM, Patel HM. A novel substrate directed multicomponent reaction for the syntheses of tetrahydro-spiro[pyrazolo[4,3-f]quinoline]-8,5′-pyrimidines and tetrahydro-pyrazolo[4,3-f]pyrimido[4,5-b]quinolines via selective multiple C–C bond formation under metal-free conditions. RSC Adv 2020; 10:19600-19609. [PMID: 35515429 PMCID: PMC9054100 DOI: 10.1039/d0ra02990d] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/08/2020] [Indexed: 12/30/2022] Open
Abstract
Substrate selectivity in the novel multi-component reaction of 5-aminoindazole, barbituric acid derivatives and aldehyde is explored.
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Affiliation(s)
| | | | - José M. Padrón
- BioLab
- Instituto Universitario de Bio-Orgánica Antonio González
- CIBICAN
- Universidad de La Laguna
- 38206 La Laguna
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6
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Singh D, Kumar V, Malakar CC, Singh V. Structural Diversity Attributed by Aza-Diels-Alder Reaction in Synthesis of Diverse Quinoline Scaffolds. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190423140805] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In recent years, the synthesis of quinoline scaffold using various methodological
devices has attracted considerable attention in synthetic chemist community. The most feasible
method to serve this purpose is Aza-Diels-Alder reaction which provides flexibility and diversity
in the synthesis of quinoline decorated with different functionalities over the scaffold.
Diversity in this functionality improvises the susceptibility of the quinoline scaffold for various
protein targets. This review encompasses multifactorial aspects of Aza-Diels-Alder reaction
as well as provides insights into the synthetic schemes for quinoline scaffold.
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Affiliation(s)
- Dharmender Singh
- Department of Chemistry, Dr B.R. Ambedkar National Institute of Technology, Jalandhar-144011, Punjab, India
| | - Vipin Kumar
- Department of Chemistry, Dr B.R. Ambedkar National Institute of Technology, Jalandhar-144011, Punjab, India
| | - Chandi C. Malakar
- Department of Chemistry, National Institute of Technology (NIT) Manipur, Imphal-795004, India
| | - Virender Singh
- Department of Chemistry, Dr B.R. Ambedkar National Institute of Technology, Jalandhar-144011, Punjab, India
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7
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Muthukrishnan I, Sridharan V, Menéndez JC. Progress in the Chemistry of Tetrahydroquinolines. Chem Rev 2019; 119:5057-5191. [PMID: 30963764 DOI: 10.1021/acs.chemrev.8b00567] [Citation(s) in RCA: 229] [Impact Index Per Article: 45.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tetrahydroquinoline is one of the most important simple nitrogen heterocycles, being widespread in nature and present in a broad variety of pharmacologically active compounds. This Review summarizes the progress achieved in the chemistry of tetrahydroquinolines, with emphasis on their synthesis, during the period from mid-2010 to early 2018.
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Affiliation(s)
- Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla) , District-Samba, Jammu 181143 , Jammu and Kashmir , India
| | - J Carlos Menéndez
- Unidad de Química Orgańica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia , Universidad Complutense , 28040 Madrid , Spain
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8
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Nainwal LM, Tasneem S, Akhtar W, Verma G, Khan MF, Parvez S, Shaquiquzzaman M, Akhter M, Alam MM. Green recipes to quinoline: A review. Eur J Med Chem 2018; 164:121-170. [PMID: 30594028 DOI: 10.1016/j.ejmech.2018.11.026] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 10/25/2018] [Accepted: 11/09/2018] [Indexed: 12/25/2022]
Abstract
The quinoline core possesses a vast number of biological activities such as anticancer, antimalarial, antimicrobial, antifungal, antitubercular and antileishmanial. The conventional classical synthetic methods require the use of expensive and harsh conditions such as high temperature. Currently the scientific communities are searching new methodology to eliminate the use of chemicals, solvents and catalysts, which are hazardous to human health as well as to environment. This review provides a concise overview of new dimensions of green chemistry approaches in designing quinoline scaffold that would encourage the researchers towards green chemistry as well as future application of these greener, non-toxic, environment friendly methods in designing quinoline scaffold.
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Affiliation(s)
- Lalit Mohan Nainwal
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Sharba Tasneem
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Wasim Akhtar
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Garima Verma
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Mohammed Faraz Khan
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Suhel Parvez
- Department of Toxicology, School of Chemical and Life Sciences, Jamia Hamdard, New Delhi, 110062, India
| | - Mohammad Shaquiquzzaman
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Mymoona Akhter
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India
| | - Mohammad Mumtaz Alam
- Drug Design & Medicinal Chemistry Lab, Department of Pharmaceutical Chemistry, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India.
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9
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Zhao HW, Feng NN, Guo JM, Du J, Ding WQ, Wang LR, Song XQ. Diastereoselective and Enantioselective Synthesis of Barbiturate-Fused Spirotetrahydroquinolines via Chiral Palladium(0)/Ligand Complex Catalyzed [4 + 2] Cycloaddition of Vinyl Benzoxazinanones with Barbiturate-Based Olefins. J Org Chem 2018; 83:9291-9299. [PMID: 30019580 DOI: 10.1021/acs.joc.8b01268] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Under the catalysis of chiral palladium(0)/ligand complex, the [4 + 2] cycloaddition between vinyl benzoxazinanones and barbiturate-based olefins proceeded readily and provided barbiturate-fused spirotetrahydroquinolines in up to 96% chemical yield with up to >99:1 dr and 97% ee. The absolute configuration of barbiturate-fused spirotetrahydroquinolines was clearly identified by X-ray single crystal structure analysis. The reaction mechanism was proposed to shed light on the enantioselective formation of barbiturate-fused spirotetrahydroquinolines.
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Affiliation(s)
- Hong-Wu Zhao
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Ning-Ning Feng
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Jia-Ming Guo
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Juan Du
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Wan-Qiu Ding
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Li-Ru Wang
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
| | - Xiu-Qing Song
- College of Life Science and Bio-engineering , Beijing University of Technology , No.100 Pingleyuan, Chaoyang District , Beijing 100124 , P. R. China
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10
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Dommaraju Y, Borthakur S, Prajapati D. Rapid Access to Indoline Spiropyran Scaffolds by Domino-Knoevenagel/oxa-Diels-Alder (DKODA) Reaction at Room Temperature. ChemistrySelect 2016. [DOI: 10.1002/slct.201601707] [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)
- Yuvaraj Dommaraju
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
| | - Somadrita Borthakur
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
| | - Dipak Prajapati
- Applied Organic Chemistry Group, Chemical Science & Technology Division; CSIR-North-East Institute of Science and Technology; Jorhat- 785006, Assam
- Academy of Scientific and Innovative Research; New Delhi India
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11
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A diastereoselective synthesis of tetrahydro- and dihydro-pyrido[2,3- c ]coumarin derivatives via a one-pot three-component Povarov reaction catalyzed by bismuth(III) chloride. Bioorg Med Chem Lett 2016; 26:5119-5125. [DOI: 10.1016/j.bmcl.2016.08.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 07/22/2016] [Accepted: 08/06/2016] [Indexed: 11/19/2022]
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12
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Liu Y, Yang W, Wu Y, Mao B, Gao X, Liu H, Sun Z, Xiao Y, Guo H. Asymmetric Construction of Highly Functionalized Spirobarbiturate-Cyclopentenes through Chiral Phosphine-Catalyzed [3+2] Annulation of Morita-Baylis-Hillman Carbonates with Barbiturate-Derived Alkenes. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600450] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yang Liu
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Wenjun Yang
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Yang Wu
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Biming Mao
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Xing Gao
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Honglei Liu
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Zhanhu Sun
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Yumei Xiao
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
| | - Hongchao Guo
- Department of Applied Chemistry; China Agricultural University; 2 West Yuanmingyuan Road Beijing 100193 People's Republic of China
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13
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Zhao HW, Tian T, Li B, Yang Z, Pang HL, Meng W, Song XQ, Chen XQ. Diastereoselective Synthesis of Dispirobarbiturates through Et3N-Catalyzed [3 + 2] Cycloaddition of Barbiturate-Based Olefins with 3-Isothiocyanato Oxindoles. J Org Chem 2015; 80:10380-5. [DOI: 10.1021/acs.joc.5b01810] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Hong-Wu Zhao
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Ting Tian
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Bo Li
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Zhao Yang
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Hai-Liang Pang
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Wei Meng
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Xiu-Qing Song
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
| | - Xiao-Qin Chen
- College
of Life Science and
Bio-engineering, Beijing University of Technology, Beijing 100124, P. R. China
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14
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Slauson SR, Pemberton R, Ghosh P, Tantillo DJ, Aubé J. Domino Acylation/Diels-Alder Synthesis of N-Alkyl-octahydroisoquinolin-1-one-8-carboxylic Acids under Low-Solvent Conditions. J Org Chem 2015; 80:5260-71. [PMID: 25901898 DOI: 10.1021/acs.joc.5b00804] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The development of the domino reaction between an aminoethyl-substituted diene and maleic anhydride to afford an N-substituted octahydroisoquinolin-1-one is described. A typical procedure involves the treatment of a 1-aminoethyl-substituted butadiene with maleic anhydride at 0 °C to room temperature for 20 min under low-solvent conditions, which affords a series of isoquinolinone carboxylic acids in moderate to excellent yields. NMR monitoring suggested that the reaction proceeded via an initial acylation step followed by an intramolecular Diels-Alder reaction. For the latter step, a significant rate difference was observed depending on whether the amino group was substituted by a phenyl or an alkyl (usually benzyl) substituent, with the former noted by NMR to be substantially slower. The Diels-Alder step was studied by density functional theory (DFT) methods, leading to the conclusion that the degree of preorganization in the starting acylated intermediate had the largest effect on the reaction barriers. In addition, the effect of electronics on the aromatic ring in N-phenyl substrates was studied computationally and experimentally. Overall, this protocol proved considerably more amenable to scale up compared to earlier methods by eliminating the requirement of microwave batch chemistry for this reaction as well as significantly reducing the quantity of solvent.
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Affiliation(s)
- Stephen R Slauson
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Ryan Pemberton
- ‡Department of Chemistry, University of California at Davis, Davis, California 95616, United States
| | - Partha Ghosh
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Dean J Tantillo
- ‡Department of Chemistry, University of California at Davis, Davis, California 95616, United States
| | - Jeffrey Aubé
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
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15
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Sarmah MM, Borthakur S, Bhuyan D, Prajapati D. Ultrasound mediated efficient synthesis of spironaphthoquinolines. RSC Adv 2015. [DOI: 10.1039/c5ra13793d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Spironaphthoquinolines can be obtained with good yields under ultrasound-mediated pseudo one-pot conditions from easily available precursors. The ‘atom-economy’ and ‘procedural simplicity’ of the process makes it an attractive protocol to synthesize desired compounds.
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Affiliation(s)
- Manas M. Sarmah
- Medicinal Chemistry Division
- CSIR-North-East Institute of Science and Technology
- Jorhat
- India
- Oil Testing Laboratory
| | - Somadrita Borthakur
- Medicinal Chemistry Division
- CSIR-North-East Institute of Science and Technology
- Jorhat
- India
| | | | - Dipak Prajapati
- Medicinal Chemistry Division
- CSIR-North-East Institute of Science and Technology
- Jorhat
- India
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16
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Bhuyan D, Sarmah MM, Dommaraju Y, Prajapati D. Microwave-promoted efficient synthesis of spiroindenotetrahydropyridine derivatives via a catalyst- and solvent-free pseudo one-pot five-component tandem Knoevenagel/aza-Diels–Alder reaction. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.07.086] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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