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Zubkov FI, Krishna G, Grudinin DG, Nikitina EV. IntraMolecular Diels–Alder Reactions of Vinylarenes and Alkynyl Arenes (the IMDAV Reaction). SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/s-0040-1705983] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractThis comprehensive review summarizes the published literature data concerning the intramolecular Diels–Alder reactions of vinylarenes (the IMDAV reaction) and alkynyl arenes from 1970 to 2019, and covers mainly intramolecular [4+2] cycloaddition reactions of vinyl- or acetylene-substituted furans, thiophenes, pyrroles, indoles, imidazoles, benzenes, and naphthalenes, in which the unsaturated substituent is linked directly to an arene moiety. The selected area of the Diels–Alder reaction differs from other forms of [4+2] cycloadditions due to the uniqueness of the diene fragment, which, along with an exocyclic multiple bond, includes the double bond of an aromatic or heteroaromatic nucleus in its system. Thus, during the formation of the [4+2] cycloaddition intermediate, the aromaticity of furan, thiophene and even benzene rings is broken, leading, as a rule, to the formation of heterocyclic structures rarely accessible by other methods, in contrast to the majority of intermolecular Diels–Alder reactions, with the highest degree of chemo-, regio-, and diastereoselectivity. Therefore, the IMDAV approach is often used for the synthesis of naturally occurring and bioactive molecules, which are also discussed in this review alongside other applications of this reaction. Whenever possible, we have tried to avoid examples of radical, photochemical, oxidative, precious-metal-complex-catalyzed cyclizations and other types of formal [4+2] cycloadditions, focusing on thermal Diels–Alder reactions in the first step, according to the classical mechanism. The second stage of the process, aromatization, is unique for many initial substrates, and hence considerable attention in this overview is given to the detailed description of the reaction mechanisms.1 Introduction2 IMDAV Reactions of Vinylfurans2.1 Alkenes as Internal Dienophiles2.2 Alkynes and Allenes as Internal Dienophiles3 IMDAV Reactions of Vinylthiophenes3.1 Alkenes as Internal Dienophiles3.2 Alkynes as Internal Dienophiles4 IMDAV Reactions of Vinylbenzothiophenes5 IMDAV Reactions of Vinylpyrroles6 IMDAV Reactions of Vinylindoles6.1 Alkenes as Internal Dienophiles6.2 Alkynes as Internal Dienophiles7 IMDAV Reactions of Styrenes and Vinylnaphthalenes7.1 Alkenes as Internal Dienophiles7.2 Alkynes as Internal Dienophiles7.3 Alkynes as Internal Dienophiles in Aryl Acetylenes (the Intramolecular Dehydro Diels–Alder Reaction)8 IMDAV Reactions of Vinylimidazoles, Vinylisoxazoles and Vinylpyridines9 Conclusion10 Abbreviations
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Xiao BX, Gao XY, Du W, Chen YC. Asymmetric Reactions involving Lewis Base Catalyst Tethered Dearomatized Intermediates. Chemistry 2018; 25:1607-1613. [PMID: 30109896 DOI: 10.1002/chem.201803592] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Indexed: 01/01/2023]
Affiliation(s)
- Ben-Xian Xiao
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Xin-Yue Gao
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Wei Du
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Ying-Chun Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
- College of Pharmacy; Third Military Medical University; Chongqing 400038 China
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Affiliation(s)
- Lukas Kröger
- Institut für Pharmazeutische und Medizinische Chemie der Universität Münster; Corrensstraße 48 48149 Münster Germany
| | - Bernhard Wünsch
- Institut für Pharmazeutische und Medizinische Chemie der Universität Münster; Corrensstraße 48 48149 Münster Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003 - CiM); Westfälische Wilhelms-Universität Münster; Germany
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Yang B, Gao S. Recent advances in the application of Diels–Alder reactions involving o-quinodimethanes, aza-o-quinone methides and o-quinone methides in natural product total synthesis. Chem Soc Rev 2018; 47:7926-7953. [DOI: 10.1039/c8cs00274f] [Citation(s) in RCA: 240] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review summarizes recent advances in Diels–Alder reactions involving o-QDMs, o-QMs and aza-o-QMs. The power and potential of this strategy in organic synthesis and natural product total synthesis is highlighted.
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Affiliation(s)
- Baochao Yang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
| | - Shuanhu Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- China
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Gu BQ, Yang WL, Wu SX, Wang YB, Deng WP. Organocatalytic asymmetric synthesis of tetrahydrocarbazoles via an inverse-electron-demand Diels–Alder reaction of 2,3-indole-dienes with enals. Org Chem Front 2018. [DOI: 10.1039/c8qo01042k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A novel 2,3-indole-diene synthon was designed and first applied to an inverse-electron-demand Diels–Alder reaction to construct tetrahydrocarbazoles with excellent stereoselectivities.
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Affiliation(s)
- Bo-Qi Gu
- School of Pharmacy and Shanghai Key Laboratory of New Drug Design
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Wu-Lin Yang
- School of Pharmacy and Shanghai Key Laboratory of New Drug Design
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Shu-Xiao Wu
- School of Pharmacy and Shanghai Key Laboratory of New Drug Design
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Yan-Bing Wang
- School of Pharmacy and Shanghai Key Laboratory of New Drug Design
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
| | - Wei-Ping Deng
- School of Pharmacy and Shanghai Key Laboratory of New Drug Design
- East China University of Science and Technology
- Shanghai 200237
- People's Republic of China
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Gu BQ, Zhang H, Su RH, Deng WP. Organocatalytic asymmetric synthesis of dihydrocarbazoles via a formal [4+2] cycloaddition of in situ generated o-quinodimethanes with enals. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.08.077] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Kumar I, Ramaraju P, Mir NA. Asymmetric trienamine catalysis: new opportunities in amine catalysis. Org Biomol Chem 2012; 11:709-16. [PMID: 23247590 DOI: 10.1039/c2ob26681d] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Amine catalysis, through HOMO-activating enamine and LUMO-activating iminium-ion formation, is receiving increasing attention among other organocatalytic strategies, for the activation of unmodified carbonyl compounds. Particularly, the HOMO-raising activation concept has been applied to the greatest number of asymmetric transformations through enamine, dienamine, and SOMO-activation strategies. Recently, trienamine catalysis, an extension of amine catalysis, has emerged as a powerful tool for synthetic chemists with a novel activation strategy for polyenals/polyenones. In this review article, we discuss the initial developments of trienamine catalysis for highly asymmetric Diels-Alder reactions with different dienophiles and emerging opportunities for other types of cycloadditions and cascade reactions.
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Affiliation(s)
- Indresh Kumar
- Department of Chemistry, Birla Institute of Technology and Science-Pilani, Pilani Campus, 333 031 Rajasthan, India.
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Xiao YC, Zhou QQ, Dong L, Liu TY, Chen YC. Asymmetric Diels–Alder Reaction of 2-Methyl-3-indolylmethanols via in Situ Generation of o-Quinodimethanes. Org Lett 2012. [PMID: 23186032 DOI: 10.1021/ol302853m] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- You-Cai Xiao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China, and College of Pharmacy, Third Military Medical University, Chongqing 400038, China
| | - Qing-Qing Zhou
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China, and College of Pharmacy, Third Military Medical University, Chongqing 400038, China
| | - Lin Dong
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China, and College of Pharmacy, Third Military Medical University, Chongqing 400038, China
| | - Tian-Yu Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China, and College of Pharmacy, Third Military Medical University, Chongqing 400038, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education, West China School of Pharmacy, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, China, and College of Pharmacy, Third Military Medical University, Chongqing 400038, China
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Ball-Jones NR, Badillo JJ, Franz AK. Strategies for the enantioselective synthesis of spirooxindoles. Org Biomol Chem 2012; 10:5165-81. [DOI: 10.1039/c2ob25184a] [Citation(s) in RCA: 592] [Impact Index Per Article: 49.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Liu Y, Nappi M, Arceo E, Vera S, Melchiorre P. Asymmetric Catalysis of Diels–Alder Reactions with in Situ Generated Heterocyclic ortho-Quinodimethanes. J Am Chem Soc 2011; 133:15212-8. [DOI: 10.1021/ja206517s] [Citation(s) in RCA: 331] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Yankai Liu
- ICIQ - Institute of Chemical Research of Catalonia, Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Manuel Nappi
- ICIQ - Institute of Chemical Research of Catalonia, Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Elena Arceo
- ICIQ - Institute of Chemical Research of Catalonia, Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Silvia Vera
- ICIQ - Institute of Chemical Research of Catalonia, Avenida Països Catalans 16, 43007 Tarragona, Spain
| | - Paolo Melchiorre
- ICIQ - Institute of Chemical Research of Catalonia, Avenida Països Catalans 16, 43007 Tarragona, Spain
- ICREA - Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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Balamurugan R, Mohanakrishnan AK. Synthesis of N-protected indolaldehydes using modified Hass procedure. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Perumal PT, Nagarajan R. An unusual hydrogen addition of indolo-2,3-quinodimethanes to dimethylindoles in the presence of 1,3-azoles. J CHEM SCI 2006. [DOI: 10.1007/bf02708473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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13
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Mohanakrishnan AK, Balamurugan R, Ramesh N. A facile preparation of N-protected indolaldehydes using a modified Hass procedure. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.09.121] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Sarkar TK, Basak S, Wainer I, Moaddel R, Yamaguchi R, Jozwiak K, Chen HT, Lin CC. Coaxing a pyridine nucleus to give up its aromaticity: synthesis and pharmacological characterization of novel conformationally restricted analogues of nicotine and anabasine. J Med Chem 2005; 47:6691-701. [PMID: 15615518 DOI: 10.1021/jm049707c] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of novel nicotine and anabasine related conformationally restricted compounds including those with pi-bonds in the connecting tether were synthesized following the hitherto unprecedented phenylsulfanyl group assisted generation of pyridine o-quinodimethane intermediates and their trapping by an intramolecular Diels-Alder reaction. Pharmacological characterization of some of these analogues at activating alpha3beta4 nAChRs was investigated, and constrained anabasine analogues 35 and 43 as well as constrained nicotine analogue 42 were found to exhibit moderately potent nicotinic agonist activity. Of special note is the fact that the pyrrolidinic nitrogen in these compounds is bound to a carbomethoxy group and, therefore, is not free to be protonated unlike all the known analogues of nicotine and anabasine, specifically designed as nAChRs agonists/antagonists. The structure-activity relationship studies indicate that when pi-cation interaction is absent, the position of chlorine atom in the pyridine ring and steric bulk at the connecting tether between the pyridine and pyrrolidine ring of the constrained nicotinic ligands are important descriptors for their binding affinity at alpha4beta2 and alpha3beta4 nAChRs as well as the subtype selectivity issue. These findings are likely to improve our understanding of the structural requirements for selectivity, which, at present, is probably the most important goal in the field of nicotinic ligands.
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Affiliation(s)
- Tarun K Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
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Burkard S, Borschberg HJ. Synthesis ofAristotelia-Type Alkaloids.. Part IV. Synthesis of (±)-aristoserratine. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19890720209] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Laronze M, Sapi J. 3-Cyanomethyl-2-vinylindoles as thermal indole-2,3-quinodimethane equivalents: synthesis of functionalized 1,2,3,4-tetrahydrocarbazoles. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01907-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Magnus P, Gazzard L, Hobson L, Payne AH, Rainey TJ, Westlund N, Lynch V. Synthesis of the Kopsia alkaloids (±)-pauciflorine B, (±)-lahadinine B, (±)-kopsidasine, (±)-kopsidasine-N-oxide, (±)-kopsijasminilam and (±)-11-methoxykopsilongine. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)00243-0] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Frank KE, Aubé J. Cyclizations of substituted benzylidene-3-alkenylamines: synthesis of the tricyclic core of the martinellines. J Org Chem 2000; 65:655-66. [PMID: 10813994 DOI: 10.1021/jo990843c] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The martinellines (1 and 2) are natural products that possess both interesting biological activity and chemical structure. During the investigation of a hetero Diels-Alder route to these molecules, alternate Lewis acid-dependent cyclizations of (2'-amino-N'-tert-butoxycarbonyl-5'-chlorobenzylidene)-3-butenylamine (10) were observed. The reaction of a variety of imines with TMSOTf or TiCl(4) led to the formation of different heterocycles including iminodibenzo[b,f][1,5]diazocines, hexahydropyrido[1, 2-c]quinazolin-6-ones, tetrahydropyrrolo[1,2-c]quinazolin-5-ones, 2-arylpiperidines, and 2-arylpyrrolidines. Tetrahydropyrrolo[1, 2-c]quinazolin-5-one 54, obtained via this new methodology, was used as an intermediate in the synthesis of the tricyclic ring system (65) of the martinellines.
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Affiliation(s)
- K E Frank
- Department of Medicinal Chemistry, University of Kansas, Lawrence, Kansas 66045-2506, USA
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Quinn JF, Bos ME, Wulff WD. Novel [1,5] sigmatropic rearrangements of cyclohexadienones generated from Fischer carbene complexes. A new strategy for installing the C-20 angular ethyl group in Aspidospermidine alkaloids. Org Lett 1999; 1:161-4. [PMID: 10822553 DOI: 10.1021/ol990063q] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[formula: see text] We report here the first examples of a [1,5] sigmatropic rearrangement in a 4a-alkyl-4a-hydrocarbazol-4-one to yield a 3-alkylcarbazol-4-one with a re-aromatized indole nucleus. The reaction of 1-methyl-3-substituted-indole-2-carbene complexes 1 with terminal alkynes yields 3,4a-dialkyl-1-methoxy-9-methylcarbazol-4-ones 2. These 4a-substituted carbazolones thermally rearrange to cleanly give the more highly aromatic 3,3-dialkyl-1-methoxy-9-methylcarbazol-4-ones 3. This reaction provides a convenient entry to the Aspidosperma family of alkaloids, which contain a 3,3-disubstituted carbazole nucleus.
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Affiliation(s)
- J F Quinn
- Department of Chemistry, Searle Chemistry Laboratory, University of Chicago, Illinois 60637, USA
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Gribble GW, Silva RA, Saulnier MG. Intramolecular Diels-Alder Reactions of 4H-Furo[3,4-b]indoles. New Syntheses of Benzo[a]carbazoles and Benzo[c]carbazoles. SYNTHETIC COMMUN 1999. [DOI: 10.1080/00397919908085823] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Saxton JE. Chapter 9 Synthesis of the Aspidosperma Alkaloids. THE ALKALOIDS: CHEMISTRY AND BIOLOGY 1998. [DOI: 10.1016/s1099-4831(08)60047-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Jakiwczyk OM, Nielsen KE, de Carvalho HN, Dmitrienko GI. A simple synthesis of N-acetyl-1,4-dihydropyrano[3,4-b]indol-3-one: Evidence for a stepwise ionic pathway in the generation of indole-2,3-quinodimethanes. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01530-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Amat M, Hadida S, Llor N, Sathyanarayana S, Bosch J. Studies on the Configurational Stability of 3-(2-Piperidyl)indoles. J Org Chem 1996; 61:3878-3882. [PMID: 11667244 DOI: 10.1021/jo952251+] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mercedes Amat
- Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, 08028-Barcelona, Spain
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Basaveswara Rao MV, Satyanarayana J, Ila H, Junjappa H. Anionic [4+2] cycloaddition reactions of indole-2,3-dienolate with dienophiles: A facile regiospecific route to substituted carbazoles. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00488-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Castells J, Troin Y, Diez A, Rubiralta M, Grierson DS, Husson HP. Synthesis and reactivity of 2-(1,3-dithian-2-yl)indoles. IV. Influence of the N,N-diethylcarbamoyl indole protecting group. Tetrahedron 1991. [DOI: 10.1016/s0040-4020(01)81946-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Chakraborty DP, Roy S. Carbazole alkaloids. III. FORTSCHRITTE DER CHEMIE ORGANISCHER NATURSTOFFE = PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS. PROGRES DANS LA CHIMIE DES SUBSTANCES ORGANIQUES NATURELLES 1991; 57:71-152. [PMID: 1937313 DOI: 10.1007/978-3-7091-9119-4_2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- D P Chakraborty
- Comparative Phytochemical Laboratory, Bose Institute, Calcutta, India
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Herslöf M, Martin* A. Synthesis of a new conformationally defined serotonin homologue by intramolecular [4+2] cycloaddition. Tetrahedron Lett 1987. [DOI: 10.1016/s0040-4039(00)96316-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Benzies DW, Fresneda PM, Jones RA. 2-Formyl-3-Methoxymethylindole, 3-Ethoxymethyl-2-Formylindole and 2-Formyl-3-Methylindole. SYNTHETIC COMMUN 1986. [DOI: 10.1080/00397918608057203] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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31
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Synthesis of Indole Alkaloids. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/b978-0-12-450280-2.50008-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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32
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Strong base induced cycloaddition of 3-carboxy-1-methylindole-2-acetic anhydride and 2-carboxybenzo[b]furan-3-acetic anhydride: synthesis of polycyclic peri-hydroxylated indole and benzofuran compounds. Tetrahedron Lett 1984. [DOI: 10.1016/s0040-4039(00)99870-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Saulnier MG, Gribble GW. 4-(phenylsulfonyl)-4H-furo[3,4-b]indole - A stable synthetic analogue of indole-2,3-quinodimethane. Tetrahedron Lett 1983. [DOI: 10.1016/s0040-4039(00)94105-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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35
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