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Cadart T, Gläsel T, Císařová I, Gyepes R, Nečas D, Hapke M, Kotora M. Cyclotrimerization Approach to Symmetric [9]Helical Indenofluorenes: Diverting Cyclization Pathways. Chemistry 2023; 29:e202301491. [PMID: 37306545 PMCID: PMC10946996 DOI: 10.1002/chem.202301491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 06/05/2023] [Accepted: 06/05/2023] [Indexed: 06/13/2023]
Abstract
Catalytic cyclotrimerization routes to symmetrical [9]helical indenofluorene were explored by using different transition-metal complexes and thermal conditions. Depending on the reaction conditions, the cyclotrimerizations were accompanied by dehydro-Diels-Alder reaction giving rise to another type of aromatic compounds. Structures of both symmetrical [9]helical cyclotrimerization product as well as the dehydro-Diels-Alder product were confirmed by single-crystal X-ray diffraction analyses. Limits of enantioselective cyclotrimerization were assessed as well. DFT calculations shed light on the reaction course and the origin of diminished enantioselectivity.
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Affiliation(s)
- Timothée Cadart
- Department of Organic ChemistryFaculty of ScienceCharles University in PragueHlavova 8128 43Praha 2Czech Republic
| | - Tim Gläsel
- Institute for Catalysis (INCA)Johannes Kepler University LinzAltenberger Strasse 69A-4040LinzAustria
| | - Ivana Císařová
- Department of Inorganic ChemistryFaculty of ScienceCharles University in PragueHlavova 8128 43Praha 2Czech Republic
| | - Róbert Gyepes
- Department of Molecular Electrochemistry and CatalysisJ. Heyrovský Institute of Physical Chemistry of the Czech Academy of SciencesDolejškova2155/3, 182 23Praha 8Czech Republic
| | - David Nečas
- Department of Organic ChemistryFaculty of ScienceCharles University in PragueHlavova 8128 43Praha 2Czech Republic
| | - Marko Hapke
- Institute for Catalysis (INCA)Johannes Kepler University LinzAltenberger Strasse 69A-4040LinzAustria
| | - Martin Kotora
- Department of Organic ChemistryFaculty of ScienceCharles University in PragueHlavova 8128 43Praha 2Czech Republic
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Goel K, Satyanarayana G. A two-step access to fused-/spiro-polycyclic frameworks via double Heck cascade and acid-driven processes. Org Biomol Chem 2023; 21:6919-6925. [PMID: 37599622 DOI: 10.1039/d3ob01112g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
This report illustrates the rapid construction of two divergent classes of polycyclic frameworks, benzo[a]fluorenones and spiro-chromenone indenes, via a double Heck cascade and an acid-driven cyclization from easily accessible precursors, alkyl 2-bromocinnamate esters and diphenylacetylenes. The present strategy has surveyed a broad substrate scope and delivered an array of products with interesting structural features. Besides, fluorescence studies were performed for the synthesized benzo[a]fluorenones.
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Affiliation(s)
- Komal Goel
- Department of Chemistry, Indian Institute of Technology (IIT), Hyderabad, Kandi, Sangareddy - 502285, India.
| | - Gedu Satyanarayana
- Department of Chemistry, Indian Institute of Technology (IIT), Hyderabad, Kandi, Sangareddy - 502285, India.
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3
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Balasubramani A, Mehta G. One-Pot Synthesis of Functionally Enriched Benzo[ b]fluorenones: An Eco-Friendly Embedment of Diverse 1-Indanones into o-Bis-Ynones. J Org Chem 2023; 88:933-943. [PMID: 36602529 DOI: 10.1021/acs.joc.2c02330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An efficient, base-promoted, one-pot, metal-free, open-flask synthesis of diverse, functionally enriched benzo[b]fluoren-11-ones has been discovered, and wide applicability of this exceptionally simple protocol with green flavors has been scoped. This synthesis proceeds via an unanticipated, tandem, double-aldol condensation between in situ-generated 1-indanone dianions and o-bis-ynones to furnish benzo[b]fluoren-11-ones harboring as many as six variegated substituents on their tetracyclic framework. This methodology has also been amplified to access heterocyclic analogues 2- and 4-azabenzo[b]fluorenones of benzo[b]fluoren-11-ones and extended to mixed linear-angular annulated pentacyclic dibenzo[a,h]fluoren-13-one.
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Affiliation(s)
| | - Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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4
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Cp∗Rh/Ag catalyzed C–H activation/cyclization sequences of NH-sulfoximines to fused aza-polyheterocycles under gentle conditions. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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5
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Large B, Prim D. On the Shape and Synthesis of Extended Fluorenones: Recent Advances and Upcoming Challenges. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Benjamin Large
- University of York Department of Chemistry YO10 5DD York United Kingdom
| | - Damien Prim
- ILV Université Paris-Saclay, UVSQ, CNRS 78035 Versailles France
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Wang Z, Wei L, Cheng Z, Xia J, Chen Z. Pd-catalyzed halocyclizations of unactivated 1,6-diynes through a formal anti-carbopalladation/bromide radical cascade. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.03.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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7
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Mandal M, Sakthivel S, Balamurugan R. Brønsted/Lewis Acid-Promoted Site-Selective Intramolecular Cycloisomerizations of Aryl-Fused 1,6-Diyn-3-ones for Diversity-Oriented Synthesis of Benzo-Fused Fluorenes and Fluorenones and Naphthyl Ketones. J Org Chem 2020; 86:333-351. [PMID: 33253563 DOI: 10.1021/acs.joc.0c02131] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Herein, a facile diversity-oriented approach to access functionalized benzo[a]fluorenes, benzo[b]fluorenones, and naphthyl ketones has been demonstrated via site-selective intramolecular cyclization of aryl-fused 1,6-diyn-3-ones. Synthesis of benzo[a]fluorenes and naphthyl ketones has been achieved selectively using TfOH and AgBF4, respectively, via in situ-formed acetals. Aryl-fused 1,6-diyn-3-ones undergo triflic acid-mediated intramolecular cyclization, leading to benzo[b]fluorenone derivatives via a radical intermediate as supported by EPR studies. Kinetic studies of these transformations have also been performed by UV-visible spectroscopic analysis to shed light on the reaction profile.
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Affiliation(s)
- Mou Mandal
- School of Chemistry, University of Hyderabad, Hyderabad 500046, India
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Wang ZY, Wang KK, Chen R, Liu H, Chen K. Ynones in Reflex-Michael Addition, CuAAC, and Cycloaddition, as Well as their Use as Nucleophilic Enols, Electrophilic Ketones, and Allenic Precursors. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901921] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Zhan-Yong Wang
- College of Chemistry and Chemical Engineering; Xinxiang University; 453000 Xinxiang Henan P. R. of China
| | - Kai-Kai Wang
- College of Chemistry and Chemical Engineering; Xinxiang University; 453000 Xinxiang Henan P. R. of China
| | - Rongxiang Chen
- College of Chemistry and Chemical Engineering; Xinxiang University; 453000 Xinxiang Henan P. R. of China
| | - Huan Liu
- College of Chemistry and Chemical Engineering; Xinxiang University; 453000 Xinxiang Henan P. R. of China
| | - Kaijun Chen
- Department of Chemistry; Lishui University; No. 1, Xueyuan Road 323000 Lishui City Zhejiang Province P. R. China
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Yaragorla S, Rajesh P. An efficient Benzannulation protocol for the synthesis of 9,9-Diphenyl-9H
-fluorenols using Intramolecular Allene Friedel-Crafts Annulation. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900895] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Srinivasarao Yaragorla
- School of Chemistry; Gurbaksh Building, W-16, 17; University of Hyderabad; P.O. Central University, Gachibowli 5000046 Hyderabad Telangana State India
| | - P. Rajesh
- School of Chemistry; Gurbaksh Building, W-16, 17; University of Hyderabad; P.O. Central University, Gachibowli 5000046 Hyderabad Telangana State India
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Miao J, Sang X, Wang Y, Deng S, Hao W. Synthesis of thiazolo[2,3-b]quinazoline derivatives via base-promoted cascade bicyclization of o-alkenylphenyl isothiocyanates with propargylamines. Org Biomol Chem 2019; 17:6994-6997. [PMID: 31298677 DOI: 10.1039/c9ob01098j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A highly efficient cascade bicyclization reaction of o-alkenylphenyl isothiocyanates with propargylamines has been developed, which affords a series of thiazolo[2,3-b]quinazolines in good to excellent yields by using K2CO3 as a base in MeCN at 80 °C. This method is transition-metal-free and operationally simple with broad functional group tolerance. Mechanistically, 6-exo-trig hydroamination followed by 5-exo-dig hydrothiolation was involved in this transformation.
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Affiliation(s)
- Jiankang Miao
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry & Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, P.R. China.
| | - Xiaoyan Sang
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry & Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, P.R. China.
| | - Yi Wang
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry & Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, P.R. China.
| | - Shufeng Deng
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry & Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, P.R. China.
| | - Wenyan Hao
- Key Laboratory of Functional Small Organic Molecules, Ministry of Education, College of Chemistry & Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, P.R. China.
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