1
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Álvarez-Constantino AM, Chaves-Pouso A, Fañanás-Mastral M. Enantioselective Allylboration of Acetylene: A Versatile Tool for the Stereodivergent Synthesis of Natural Products. Angew Chem Int Ed Engl 2024; 63:e202407813. [PMID: 38860849 DOI: 10.1002/anie.202407813] [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: 04/24/2024] [Revised: 06/03/2024] [Accepted: 06/10/2024] [Indexed: 06/12/2024]
Abstract
Efficient catalytic methods that allow the use of simple and abundant chemical feedstocks for the preparation of synthetically versatile compounds are central to modern synthetic chemistry. Acetylene is a basic feedstock with a remarkable production over one million tons per year, although it is underutilized in the stereoselective synthesis of fine chemicals. Here we report a facile catalytic multicomponent reaction that allows for the enantio- and diastereoselective allylboration of acetylene gas. This process is catalyzed by a chiral copper catalyst, operates without specialized equipment or pressurization, and provides chiral skipped dienes bearing stereodefined and orthogonally functionalized olefins with excellent levels of chemo-, regio-, enantio- and diastereoselectivity. The combined stereochemical features and orthogonal functionalization make the products privileged structural scaffolds to access the complete set of stereoisomers of the chiral skipped diene core through simple enantio- and diastereodivergent pathways. The utility of the method is demonstrated with the enantioselective synthesis of three bioactive natural skipped diene products, namely (+)-Nyasol, (+)-Hinokiresinol and Phorbasin C, and other related synthetically relevant chiral molecules.
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Affiliation(s)
- Andrés M Álvarez-Constantino
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Andrea Chaves-Pouso
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Martín Fañanás-Mastral
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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2
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Munakala A, Nallamilli T, Nanubolu JB, Chegondi R. Steric- and Electronic-Controlled Intramolecular [2 + 2]-Cycloaddition of Cyclohexadienone-Containing 1,7-Enynes. Org Lett 2022; 24:892-896. [PMID: 35023756 DOI: 10.1021/acs.orglett.1c04232] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Herein we have developed the silver-catalyzed electronic- and steric-controlled intramolecular formal [2 + 2]-cycloaddition of alkyne-tethered cyclohexadienones. Substrates with electron-rich alkynes and a less hindered quaternary carbon center afford tricyclic fused cyclobutenes through 1,7-enyne cyclization. In contrast, the formation of dihydrofurans was observed from electron-deficient alkynes via proton abstraction/C-O bond cleavage. The synthetic potential of this method was also broadened with a gram-scale reaction and various transformations on cyclobutene.
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Affiliation(s)
- Anandarao Munakala
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Tarun Nallamilli
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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3
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Mukhopadhyay S, Boobalan R, Chein RJ. Oxathiaborolium-catalyzed enantioselective [2 + 2] cycloadditions. Org Biomol Chem 2022; 20:8405-8409. [DOI: 10.1039/d2ob01779b] [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]
Abstract
The one-pot-prepared oxathiaborolium pentachlorostannate is an excellent Lewis acid and is successfully used to catalyze the [2 + 2] cycloadditions of N-substituted maleimides and silyl enol ethers with excellent enantioselectivities.
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Affiliation(s)
| | | | - Rong-Jie Chein
- Institute of Chemistry, Academia Sinica, Nankang, Taipei 11529, Taiwan
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4
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Arcile G, Retailleau P, Ouazzani J, Betzer J. Total Synthesis of the Fungal Metabolite Trienylfuranol A through Nucleophilic Diastereodivergent Additions to Oxocarbenium Ions. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Guillaume Arcile
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301 Université Paris-Saclay 1 avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301 Université Paris-Saclay 1 avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Jamal Ouazzani
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301 Université Paris-Saclay 1 avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
| | - Jean‐Francois Betzer
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301 Université Paris-Saclay 1 avenue de la Terrasse 91198 Gif-sur-Yvette Cedex France
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5
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Zeng L, Xu J, Zhang D, Yan Z, Cheng G, Rao W, Gao L. Catalytic Enantioselective [2+2] Cycloaddition of α-Halo Acroleins: Construction of Cyclobutanes Containing Two Tetrasubstituted Stereocenters. Angew Chem Int Ed Engl 2020; 59:21890-21894. [PMID: 32803881 DOI: 10.1002/anie.202008465] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 07/31/2020] [Indexed: 01/16/2023]
Abstract
A catalytic enantioselective formal [2+2] cycloaddition between α-halo acroleins and electronically diverse arylalkenes is described. In the presence of (S)-oxazaborolidinium cation as the catalyst, densely functionalized cyclobutanes containing two vicinal tetrasubstituted stereocenters were produced in high yields and high diastereoselectivities with excellent enantioselectivities. Mechanistic studies revealed that the cis isomer could be transformed into the trans isomer via an enantiocontrolled process. A gram-scale reaction of this catalytic method was used to demonstrate its synthetic potential.
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Affiliation(s)
- Lei Zeng
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
| | - Jingjing Xu
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
| | - Dongsheng Zhang
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
| | - Zhongliang Yan
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
| | - Guolin Cheng
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
| | - Weidong Rao
- Jiangsu Key Laboratory of Biomass-Based Green Fuels and Chemicals, College of Chemical Engineering, Nanjing Forestry University, Nanjing, China
| | - Lizhu Gao
- College of Materials Science and Engineering, Huaqiao University, No.668 Jimei Avenue, Xiamen, Fujian, China
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6
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Zeng L, Xu J, Zhang D, Yan Z, Cheng G, Rao W, Gao L. Catalytic Enantioselective [2+2] Cycloaddition of α‐Halo Acroleins: Construction of Cyclobutanes Containing Two Tetrasubstituted Stereocenters. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Lei Zeng
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
| | - Jingjing Xu
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
| | - Dongsheng Zhang
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
| | - Zhongliang Yan
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
| | - Guolin Cheng
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
| | - Weidong Rao
- Jiangsu Key Laboratory of Biomass-Based Green Fuels and Chemicals College of Chemical Engineering Nanjing Forestry University Nanjing China
| | - Lizhu Gao
- College of Materials Science and Engineering Huaqiao University No.668 Jimei Avenue Xiamen Fujian China
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7
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Hancock EN, Wiest JM, Brown MK. Recent advances in the synthesis of gem-dimethylcyclobutane natural products. Nat Prod Rep 2019; 36:1383-1393. [PMID: 30855044 PMCID: PMC6739199 DOI: 10.1039/c8np00083b] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: January 2000 to July 2018 gem-Dimethylcyclobutanes are a common motif found in a multitude of natural products, and thus these structures have captivated synthetic chemists for years. However, until the turn of the century, most synthetic efforts relied upon the use of widely available terpenes, such as pinene or caryophyllene, that already contain the gem-dimethylcyclobutane motif. This approach limits the scope of molecules that can be accessed readily. This review highlights recent syntheses in which the gem-dimethylcyclobutane is assembled via de novo approaches. An outlook on the future of this research area is also provided.
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Affiliation(s)
- Erin N. Hancock
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47405, USA.
| | - Johannes M. Wiest
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47405, USA.
| | - M. Kevin Brown
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave. Bloomington, IN 47405, USA.
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8
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Sugiura H, Yamazaki S, Go K, Ogawa A. Intramolecular Cyclization of 3,3-Diarylpropenylamides of Electron-Deficient Alkenes: Stereoselective Synthesis of Functionalized Hexahydrobenzo[ f
]isoindoles. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Hirotaka Sugiura
- Department of Applied Chemistry; Graduate School of Engineering; Osaka Prefecture University; Gakuen-cho 1-1 599-8531 Nakaku, Sakai Osaka Japan
| | - Shoko Yamazaki
- Department of Chemistry; Nara University of Education; Takabatake-cho 630-8528 Nara Japan
| | - Kakeru Go
- Department of Chemistry; Nara University of Education; Takabatake-cho 630-8528 Nara Japan
| | - Akiya Ogawa
- Department of Applied Chemistry; Graduate School of Engineering; Osaka Prefecture University; Gakuen-cho 1-1 599-8531 Nakaku, Sakai Osaka Japan
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9
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Wu H, Hsung RP, Tang Y. Total Syntheses of (±)-Rhodonoids A and B and C12-epi-Rhodonoid B. J Org Chem 2017; 82:1545-1551. [PMID: 28034311 DOI: 10.1021/acs.joc.6b02739] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Total syntheses of (±)-rhodonoids A and B and C12-epi-rhodonoid B are described here. A unified strategy employed in these syntheses is an intramolecular oxa-[3 + 3] annulation for accessing the chromene unit. A Fe(OTf)3-promoted diastereoselective cationic [2 + 2] cycloaddition and a photochemical [2 + 2] cycloaddition were featured to construct the cyclobutane core of (±)-rhodonoids A and B and C12-epi-rhodonoid B, respectively. Fe(OTf)3 also leads to an interesting bridged tetracycle, which was unambiguously confirmed by single crystal X-ray analysis.
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Affiliation(s)
- Hao Wu
- School of Pharmaceutical Science and Technology, Tianjin University , Tianjin, 300072 P. R. China
| | - Richard P Hsung
- School of Pharmacy, University of Wisconsin , Madison, Wisconsin 53705, United States
| | - Yu Tang
- School of Pharmaceutical Science and Technology, Tianjin University , Tianjin, 300072 P. R. China.,Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China , 5 Yushan Road, Qingdao 266003, China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology , Qingdao 266237, P. R. China
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10
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Sytniczuk A, Kajetanowicz A, Grela K. Fishing for the right catalyst for the cross-metathesis reaction of methyl oleate with 2-methyl-2-butene. Catal Sci Technol 2017. [DOI: 10.1039/c6cy02623k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comparison of the reactivity of different ruthenium-based complexes in the cross-metathesis reaction of methyl oleate was presented.
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Affiliation(s)
- A. Sytniczuk
- Faculty of Chemistry
- Biological and Chemical Research Centre
- University of Warsaw
- 02-089 Warsaw
- Poland
| | - A. Kajetanowicz
- Institute of Organic Chemistry
- Polish Academy of Sciences
- 01-224 Warsaw
- Poland
| | - K. Grela
- Faculty of Chemistry
- Biological and Chemical Research Centre
- University of Warsaw
- 02-089 Warsaw
- Poland
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11
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Yamazaki S, Sugiura H, Ohashi S, Ishizuka K, Saimu R, Mikata Y, Ogawa A. Intramolecular [2 + 2] and [4 + 2] Cycloaddition Reactions of Cinnamylamides of Ethenetricarboxylate in Sequential Processes. J Org Chem 2016; 81:10863-10886. [PMID: 27723343 DOI: 10.1021/acs.joc.6b01947] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Intramolecular [2 + 2] and [4 + 2] cycloaddition reactions of cinnamylamides of ethenetricarboxylate in sequential processes have been studied. Reaction of 1,1-diethyl 2-hydrogen ethenetricarboxylate and trans-cinnamylamines in the presence of EDCI/HOBt/Et3N led to pyrrolidine products in one pot, via intramolecular [2 + 2], [4 + 2], and some other cyclizations. The types of the products depend on the substituents on the benzene ring and the reaction conditions. Reaction of cinnamylamines without substituents on the benzene ring and with halogens and OMe on the para position at room temperature gave cyclobutane-fused pyrrolidines as major products via [2 + 2] cycloaddition. The reaction at 80 °C in 1,2-dichloroethane gave δ-lactone fused pyrrolidines as major products, probably via ring-opening of the cyclobutanes. Interestingly, reaction of 1,1-diethyl 2-hydrogen ethenetricarboxylate and cinnamylamines bearing electron-withdrawing groups such as NO2, CN, CO2Me, CO2Et, and CF3 on ortho and para positions in the presence of EDCI/HOBt/Et3N at room temperature or at 60-80 °C gave tetrahydrobenz[f]isoindolines via [4 + 2] cycloaddition as major products. DFT studies have been performed to explained the observed [2 + 2]/[4 + 2] selectivity.
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Affiliation(s)
- Shoko Yamazaki
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Hirotaka Sugiura
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan.,Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , Gakuen-cho 1-1, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Shinnosuke Ohashi
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Keisuke Ishizuka
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Rina Saimu
- Department of Chemistry, Nara University of Education , Takabatake-cho, Nara 630-8528, Japan
| | - Yuji Mikata
- KYOUSEI Science Center, Nara Women's University , Nara 630-8506, Japan
| | - Akiya Ogawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , Gakuen-cho 1-1, Nakaku, Sakai, Osaka 599-8531, Japan
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12
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Norris MD, Perkins MV. Total Synthesis of Plakilactones C, B and des-Hydroxyplakilactone B by the Oxidative Cleavage of Gracilioether Furanylidenes. J Org Chem 2016; 81:6848-54. [DOI: 10.1021/acs.joc.6b01196] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Matthew D. Norris
- School of Chemical and Physical
Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
| | - Michael V. Perkins
- School of Chemical and Physical
Sciences, Flinders University, GPO Box 2100, Adelaide, SA 5001, Australia
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13
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Sabbatani J, Maulide N. Temporary Generation of a Cyclopropyl Oxocarbenium Ion Enables Highly Diastereoselective Donor-Acceptor Cyclopropane Cycloaddition. Angew Chem Int Ed Engl 2016; 55:6780-3. [PMID: 27099179 DOI: 10.1002/anie.201601340] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/07/2016] [Indexed: 11/08/2022]
Abstract
A novel formal [3+2] cycloaddition of cyclopropylacetals and aldehydes was developed, and the resulting trisubstituted tetrahydrofurans display three new chiral centers formed with highly diastereoselectivity. This method is stereocomplementary to most previously reported cycloadditions of malonate diesters, relies on the transient generation of cyclopropyl oxocarbenium ions, proceeds under mild conditions, and is based on the concept of temporary activation of an otherwise inert protecting group.
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Affiliation(s)
- Juliette Sabbatani
- Fakultät für Chemie, Institut für Organische Chemie, Universität Wien, Währinger Straße 38, 1090, Wien, Austria
| | - Nuno Maulide
- Fakultät für Chemie, Institut für Organische Chemie, Universität Wien, Währinger Straße 38, 1090, Wien, Austria.
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14
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Sabbatani J, Maulide N. Temporäre Bildung eines Cyclopropyl-Oxocarbeniumions ermöglicht eine außerordentlich diastereoselektive Cycloaddition von Donor-Akzeptor-Cyclopropanen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601340] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Juliette Sabbatani
- Fakultät für Chemie, Institut für Organische Chemie; Universität Wien; Währinger Straße 38 1090 Wien Österreich
| | - Nuno Maulide
- Fakultät für Chemie, Institut für Organische Chemie; Universität Wien; Währinger Straße 38 1090 Wien Österreich
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15
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Hong YJ, Tantillo DJ. How cyclobutanes are assembled in nature--insights from quantum chemistry. Chem Soc Rev 2015; 43:5042-50. [PMID: 24710596 DOI: 10.1039/c3cs60452g] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biosynthetic production of cyclobutanes leads to many complex natural products. Recently, theoretical work employing quantum chemical calculations has shed light on many of the details of cyclobutane-formation, in particular, for terpene natural products. Specific insights and general principles derived from these theoretical studies are described herein.
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Affiliation(s)
- Young J Hong
- Department of Chemistry, University of California-Davis, Davis, CA 95616, USA.
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16
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Kim KH, Lim JW, Lee J, Go MJ, Kim JN. Thermal Intramolecular [2+2] Cycloaddition: Synthesis of 3-Azabicyclo[3.1.1]heptanes from Morita-Baylis-Hillman Adduct-Derived 4,4-Diaryl-1,3-dienes. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400571] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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17
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Hurtley AE, Lu Z, Yoon TP. [2+2] cycloaddition of 1,3-dienes by visible light photocatalysis. Angew Chem Int Ed Engl 2014; 53:8991-4. [PMID: 24985967 PMCID: PMC4134740 DOI: 10.1002/anie.201405359] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Indexed: 11/08/2022]
Abstract
[2+2] photocycloadditions of 1,3-dienes represent a powerful yet synthetically underutilized class of reactions. We report that visible light absorbing transition metal complexes enable the [2+2] cycloaddition of a diverse range of 1,3-dienes. The ability to use long-wavelength visible light is attractive because these reaction conditions tolerate the presence of sensitive functional groups that might be readily decomposed by the high-energy UVC radiation required for direct photoexcitation of 1,3-dienes. The resulting vinylcyclobutane products are poised for a variety of further diversification reactions, and this method is consequently expected to be powerfully enabling in the synthesis of complex organic targets.
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Affiliation(s)
- Anna E. Hurtley
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue Madison, WI 53706, USA
| | - Zhan Lu
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue Madison, WI 53706, USA
| | - Tehshik P. Yoon
- Department of Chemistry, University of Wisconsin–Madison, 1101 University Avenue Madison, WI 53706, USA
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18
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Hurtley AE, Lu Z, Yoon TP. [2+2] Cycloaddition of 1,3-Dienes by Visible Light Photocatalysis. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405359] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Li X, Lee YR. Efficient and novel one-pot synthesis of polycycles bearing cyclols by FeCl3-promoted [2 + 2] cycloaddition: application to cannabicyclol, cannabicyclovarin, and ranhuadujuanine A. Org Biomol Chem 2014; 12:1250-7. [DOI: 10.1039/c3ob42110d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Yeom HS, Li H, Tang Y, Hsung RP. Total Syntheses of Cannabicyclol, Clusiacyclol A and B, Iso-Eriobrucinol A and B, and Eriobrucinol. Org Lett 2013; 15:3130-3. [DOI: 10.1021/ol401335u] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Hyun-Suk Yeom
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States, and School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072, P. R. China
| | - Hui Li
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States, and School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072, P. R. China
| | - Yu Tang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States, and School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072, P. R. China
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, United States, and School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, 300072, P. R. China
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21
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Deng J, Hsung RP, Ko C. Gassman’s Cationic [2 + 2] Cycloadditions Using Temporary Tethers. Org Lett 2012; 14:5562-5. [DOI: 10.1021/ol3026796] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun Deng
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, Wisconsin 53705-2222, United States
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, Wisconsin 53705-2222, United States
| | - Changhong Ko
- Division of Pharmaceutical Sciences and Department of Chemistry, Rennebohm Hall, 777 Highland Avenue, University of Wisconsin, Madison, Wisconsin 53705-2222, United States
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22
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P. Hsung R, B. Feltenberger J, Ko C, Deng J, K. Ghosh S. Development of an Intramolecular Gassman’s [2+2] Cycloaddition. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)65] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Smith SG, Goodman JM. Assigning stereochemistry to single diastereoisomers by GIAO NMR calculation: the DP4 probability. J Am Chem Soc 2011; 132:12946-59. [PMID: 20795713 DOI: 10.1021/ja105035r] [Citation(s) in RCA: 635] [Impact Index Per Article: 48.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
GIAO NMR shift calculation has been applied to the challenging task of reliably assigning stereochemistry with quantifiable confidence when only one set of experimental data are available. We have compared several approaches for assigning a probability to each candidate structure and have tested the ability of these methods to distinguish up to 64 possible diastereoisomers of 117 different molecules, using NMR shifts obtained in rapid and computationally inexpensive single-point calculations on molecular mechanics geometries without time-consuming ab initio geometry optimization. We show that a probability analysis based on the errors in each (13)C or (1)H shift is significantly more successful at making correct assignments with high confidence than are probabilities based on the correlation coefficient and mean absolute error parameters. Our new probability measure, which we have termed DP4, complements the probabilities obtained from our previously developed CP3 parameter, which applies to the case of assigning a pair of diastereoisomers when one has both experimental data sets. We illustrate the application of DP4 to assigning the stereochemistry or structure of 21 natural products that were originally misassigned in the literature or that required extensive synthesis of diastereoisomers to establish their stereochemistry.
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Affiliation(s)
- Steven G Smith
- Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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Figueroa R, Feltenberger JB, Guevarra CC, Hsung RP. Two Remarkable Epimerizations Imperative for the Success of an Asymmetric Total Synthesis of (+)-Aigialospirol. Sci China Chem 2011; 54:31-42. [PMID: 21221423 PMCID: PMC3017383 DOI: 10.1007/s11426-010-4176-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Two remarkable epimerization processes were uncovered during our pursuit of an enantioselective synthesis of (+)-aigialospirol featuring a cyclic acetal tethered ring-closing metathesis. Through modeling, we were able to turn these two unexpected epimerizations to our advantage via modeling to ensure a successful and concise total synthesis, thereby firmly establishing cyclic acetal tethered RCM as a powerful strategy in natural product synthesis. Most importantly, calculations allowed us to fully understand the nature and the mechanistic course of these two epimerizations that were imperative to the total synthesis efforts.
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Affiliation(s)
- Ruth Figueroa
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, WI 53705 USA
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Le Liepvre M, Ollivier J, Aitken DJ. Synthesis of Functionalized Bicyclo[3.2.0]heptanes - a Study of the [2+2] Photocycloaddition Reactions of 4-Hydroxycyclopent-2-enone Derivatives. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900749] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Zhao JF, Loh TP. Acid-Catalyzed Intramolecular [2+2] Cycloaddition of Ene-allenones: Facile Access to Bicyclo[n.2.0] Frameworks. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902471] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Zhao JF, Loh TP. Acid-Catalyzed Intramolecular [2+2] Cycloaddition of Ene-allenones: Facile Access to Bicyclo[n.2.0] Frameworks. Angew Chem Int Ed Engl 2009; 48:7232-5. [DOI: 10.1002/anie.200902471] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Smith SG, Goodman JM. Assigning the stereochemistry of pairs of diastereoisomers using GIAO NMR shift calculation. J Org Chem 2009; 74:4597-607. [PMID: 19459674 DOI: 10.1021/jo900408d] [Citation(s) in RCA: 209] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
GIAO NMR chemical shifts have been calculated for a set of 28 pairs of diastereoisomers in order to test the ability of NMR shift calculation to distinguish between diastereomeric structures. We compare the performance of several different parameters for quantifying the agreement between calculated and experimental shifts from the point of view of assigning structures and introduce a new parameter, CP3, based on comparing differences in calculated shift with differences in experimental shift, which is significantly more successful at making correct structure assignments with high confidence than are the currently used parameters of the mean absolute error and the correlation coefficient. Using our new parameter in conjunction with Bayes' theorem, stereostructure assignments can be made with quantifiable confidence using shifts obtained in single point calculations on molecular mechanics geometries without computationally expensive ab initio geometry optimization.
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Affiliation(s)
- Steven G Smith
- Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
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