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Martin AC, Rogers JA, Batsomboon P, Morrison AE, Ramsubhag RR, Popp BV, Dudley GB. Benzannulation and Hydrocarboxylation Methods for the Synthesis of a Neopentylene-Fused Analogue of Ibuprofen. ACS OMEGA 2021; 6:30108-30114. [PMID: 34778682 PMCID: PMC8582271 DOI: 10.1021/acsomega.1c04943] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 10/14/2021] [Indexed: 05/02/2023]
Abstract
Neopentylene ring fusions (ring-fused 4,4-dimethylcyclopentane polycycles) are found in many natural products, but they are largely absent from synthetic compound libraries and focused medicinal chemistry research. Here is reported a synthetic approach to one of the few non-natural product-based target compounds from medicinal chemistry that includes a neopentylene ring fusion: an analogue of ibuprofen referred to herein as "neoprofen". The approach features ring-opening fragmentation reactions of dimedone derivatives coupled with transition metal-catalyzed benzannulation and hydrocarboxylation methods.
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Affiliation(s)
- A. C. Martin
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Jessica A. Rogers
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Paratchata Batsomboon
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Alec E. Morrison
- Department
of Chemistry and Biochemistry, Florida State
University, Tallahassee, Florida 32306, United States
| | - Ron R. Ramsubhag
- Department
of Chemistry and Biochemistry, Florida State
University, Tallahassee, Florida 32306, United States
| | - Brian V. Popp
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Gregory B. Dudley
- C.
Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
- Department
of Chemistry and Biochemistry, Florida State
University, Tallahassee, Florida 32306, United States
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2
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Alabugin IV, Kuhn L, Medvedev MG, Krivoshchapov NV, Vil' VA, Yaremenko IA, Mehaffy P, Yarie M, Terent'ev AO, Zolfigol MA. Stereoelectronic power of oxygen in control of chemical reactivity: the anomeric effect is not alone. Chem Soc Rev 2021; 50:10253-10345. [PMID: 34263287 DOI: 10.1039/d1cs00386k] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Although carbon is the central element of organic chemistry, oxygen is the central element of stereoelectronic control in organic chemistry. Generally, a molecule with a C-O bond has both a strong donor (a lone pair) and a strong acceptor (e.g., a σ*C-O orbital), a combination that provides opportunities to influence chemical transformations at both ends of the electron demand spectrum. Oxygen is a stereoelectronic chameleon that adapts to the varying situations in radical, cationic, anionic, and metal-mediated transformations. Arguably, the most historically important stereoelectronic effect is the anomeric effect (AE), i.e., the axial preference of acceptor groups at the anomeric position of sugars. Although AE is generally attributed to hyperconjugative interactions of σ-acceptors with a lone pair at oxygen (negative hyperconjugation), recent literature reports suggested alternative explanations. In this context, it is timely to evaluate the fundamental connections between the AE and a broad variety of O-functional groups. Such connections illustrate the general role of hyperconjugation with oxygen lone pairs in reactivity. Lessons from the AE can be used as the conceptual framework for organizing disjointed observations into a logical body of knowledge. In contrast, neglect of hyperconjugation can be deeply misleading as it removes the stereoelectronic cornerstone on which, as we show in this review, the chemistry of organic oxygen functionalities is largely based. As negative hyperconjugation releases the "underutilized" stereoelectronic power of unshared electrons (the lone pairs) for the stabilization of a developing positive charge, the role of orbital interactions increases when the electronic demand is high and molecules distort from their equilibrium geometries. From this perspective, hyperconjugative anomeric interactions play a unique role in guiding reaction design. In this manuscript, we discuss the reactivity of organic O-functionalities, outline variations in the possible hyperconjugative patterns, and showcase the vast implications of AE for the structure and reactivity. On our journey through a variety of O-containing organic functional groups, from textbook to exotic, we will illustrate how this knowledge can predict chemical reactivity and unlock new useful synthetic transformations.
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Affiliation(s)
- Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Leah Kuhn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Michael G Medvedev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation.,A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova St., 119991 Moscow, Russian Federation
| | - Nikolai V Krivoshchapov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation.,Lomonosov Moscow State University, Leninskie Gory 1 (3), Moscow, 119991, Russian Federation
| | - Vera A Vil'
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Ivan A Yaremenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Patricia Mehaffy
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA.
| | - Meysam Yarie
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65167, Iran
| | - Alexander O Terent'ev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Mohammad Ali Zolfigol
- Department of Organic Chemistry, Faculty of Chemistry, Bu-Ali Sina University, Hamedan 65167, Iran
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3
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Affiliation(s)
- Amir Tavakoli
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
| | - Gregory B. Dudley
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, West Virginia 26505, United States
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4
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Tang L, Yang F, Cheng H, Tan C, Jin C, Chen H, Huang Y, Zhang S, Song W, Tan J. Copper-Catalyzed Oxidative Fragmentation of Alkynes with NFSI Provides Aryl Ketones. Org Lett 2020; 22:8618-8623. [DOI: 10.1021/acs.orglett.0c03201] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lin Tang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Fang Yang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Hao Cheng
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Chen Tan
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China
| | - Chaochao Jin
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China
| | - Hanfei Chen
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Yifan Huang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Shuaifei Zhang
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Weihan Song
- College of Chemistry and Chemical Engineering, Xinyang Normal University, Xinyang 464000, China
| | - Jiajing Tan
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing 100029, China
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5
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Bahrami K, Khodaei MM, Batooie N, Hosseinzadeh N, Foroumadi A. Hexyltriphenylphosphonium Bromide as an Absolutely Chemoselective Ionic Liquid Catalyst in the Three‐Component Reaction of Aryl Aldehydes, Acetophenones and Malononitrile. ChemistrySelect 2019. [DOI: 10.1002/slct.201901076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Kiumars Bahrami
- Department of Organic ChemistryFaculty of ChemistryRazi University Kermanshah 67149-67346 Iran
| | - Mohammad M. Khodaei
- Department of Organic ChemistryFaculty of ChemistryRazi University Kermanshah 67149-67346 Iran
| | - Nasim Batooie
- Department of Organic ChemistryFaculty of ChemistryRazi University Kermanshah 67149-67346 Iran
| | - Nouraddin Hosseinzadeh
- Laboratory of Organic Synthesis and Natural ProductsDepartment of ChemistrySharif University of Technology Azadi Street PO Box 11155–9516, Tehran Iran
| | - Alireza Foroumadi
- Department of Medicinal ChemistryFaculty of PharmacyTehran University of Medical Sciences, Tehran Iran
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6
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Kim DE, Zhu Y, Newhouse TR. Vinylogous acyl triflates as an entry point to α,β-disubstituted cyclic enones via Suzuki-Miyaura cross-coupling. Org Biomol Chem 2019; 17:1796-1799. [PMID: 30500029 DOI: 10.1039/c8ob02573h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An alternative protocol for the B-alkyl Suzuki-Miyaura reaction to produce cyclic α,β-disubstituted enones is reported. The use of β-triflyl enones as coupling partners in lieu of their halogenated analogs provides enhanced substrate stability to light and chromatography without adversely affecting reactivity. This protocol allows efficient access to the synthetically challenging α,β-disubstituted enone motif under mild conditions.
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Affiliation(s)
- Daria E Kim
- Department of Chemistry, Yale University, 225 Prospect St, New Haven, CT 06520-8107, USA.
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7
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Deng J, Wu J, Tian H, Bao J, Shi Y, Tian W, Gui J. Alkynes From Furans: A General Fragmentation Method Applied to the Synthesis of the Proposed Structure of Aglatomin B. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712365] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jiachen Deng
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Jingjing Wu
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Hailong Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Jiajing Bao
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Yong Shi
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Weisheng Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
| | - Jinghan Gui
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; University of Chinese Academy of Sciences Chinese Academy of Sciences; 345 Lingling Road Shanghai 200032 China
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8
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Deng J, Wu J, Tian H, Bao J, Shi Y, Tian W, Gui J. Alkynes From Furans: A General Fragmentation Method Applied to the Synthesis of the Proposed Structure of Aglatomin B. Angew Chem Int Ed Engl 2018; 57:3617-3621. [PMID: 29388298 DOI: 10.1002/anie.201712365] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 01/29/2018] [Indexed: 11/08/2022]
Abstract
Furans are versatile synthons in organic chemistry. Described is a general method for transforming furans into alkynes by dual C-C double-bond cleavage. The reaction is proposed to proceed by sequential [4+2] cycloaddition between furan and singlet oxygen and a formal retro-(3+2) fragmentation of the endoperoxide intermediate. A wide array of furans, including those derived from sapogenins, are amenable to this reaction, thus providing the corresponding alkynoic acids in up to 88 % yields. The synthetic utility was demonstrated by a seven-step synthesis of the proposed structure of a pregnane natural product, aglatomin B, from a known intermediate.
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Affiliation(s)
- Jiachen Deng
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Jingjing Wu
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Hailong Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Jiajing Bao
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Yong Shi
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Weisheng Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Jinghan Gui
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
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9
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Kutsumura N, Shibuya K, Yamaguchi H, Saito T. n-Butyllithium-promoted regioselective elimination of vicinal bis-triflate having an adjacent ether oxygen. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.09.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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10
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Häring AP, Biallas P, Kirsch SF. An Unconventional Reaction of 2,2-Diazido Acylacetates with Amines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601625] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Andreas P. Häring
- Organic Chemistry; Bergische Universität Wuppertal; Gaußstraße 20 42119 Wuppertal Germany
| | - Phillip Biallas
- Organic Chemistry; Bergische Universität Wuppertal; Gaußstraße 20 42119 Wuppertal Germany
| | - Stefan F. Kirsch
- Organic Chemistry; Bergische Universität Wuppertal; Gaußstraße 20 42119 Wuppertal Germany
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11
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Munteanu C, Frantz DE. Palladium-Catalyzed Synthesis of Alkynes via a Tandem Decarboxylation/Elimination of (E)-Enol Triflates. Org Lett 2016; 18:3937-9. [PMID: 27456435 DOI: 10.1021/acs.orglett.6b01904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mild catalytic synthesis of alkynes via a tandem Pd-catalyzed decarboxylation/elimination of enol triflates is described. Key attributes of the method include readily available starting materials, broad functional group tolerance, and the ability to access terminal, internal, and halogenated alkynes. The preliminary scope of the reaction is demonstrated on 25 different examples with yields ranging from 63% to 96%.
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Affiliation(s)
- Charissa Munteanu
- Department of Chemistry, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
| | - Doug E Frantz
- Department of Chemistry, The University of Texas at San Antonio , One UTSA Circle, San Antonio, Texas 78249, United States
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12
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Synthesis of C1–C15 of palmerolide A: tactical advances that can lead to better design strategies for polyketide synthesis. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Hoang TT, Birepinte M, Kramer NJ, Dudley GB. Six-Step Synthesis of Alcyopterosin A, a Bioactive Illudalane Sesquiterpene with a gem-Dimethylcyclopentane Ring. Org Lett 2016; 18:3470-3. [DOI: 10.1021/acs.orglett.6b01665] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Tung T. Hoang
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Mélodie Birepinte
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Nicholas J. Kramer
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Gregory B. Dudley
- Department of Chemistry and
Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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14
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RETRACTED ARTICLE: Computational studies on the regioselectivity of metal-catalyzed synthesis of 1,2,3 triazoles via click reaction: a review. J Mol Model 2015; 21:264. [DOI: 10.1007/s00894-015-2810-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 08/30/2015] [Indexed: 01/06/2023]
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15
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Fan W, Yang Y, Lei J, Jiang Q, Zhou W. Copper-Catalyzed N-Benzoylation of Amines via Aerobic C–C Bond Cleavage. J Org Chem 2015; 80:8782-9. [DOI: 10.1021/acs.joc.5b01670] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wenyou Fan
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Youqing Yang
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Jianhua Lei
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Qijian Jiang
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Wang Zhou
- College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
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16
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Zhou W, Fan W, Jiang Q, Liang YF, Jiao N. Copper-Catalyzed Aerobic Oxidative C–C Bond Cleavage of Unstrained Ketones with Air and Amines. Org Lett 2015; 17:2542-5. [DOI: 10.1021/acs.orglett.5b01114] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wang Zhou
- College
of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Wenyou Fan
- College
of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Qijian Jiang
- College
of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
| | - Yu-Feng Liang
- State
Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical
Sciences, Peking University, Xue Yuan Road 38, Beijing 100191, China
| | - Ning Jiao
- State
Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical
Sciences, Peking University, Xue Yuan Road 38, Beijing 100191, China
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17
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Pace V, Castoldi L, Holzer W. Chemoselective Additions of Chloromethyllithium Carbenoid to Cyclic Enones: A Direct Access to Chloromethyl Allylic Alcohols. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201301042] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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19
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Drahl MA, Manpadi M, Williams LJ. C-C fragmentation: origins and recent applications. Angew Chem Int Ed Engl 2013; 52:11222-51. [PMID: 24115282 DOI: 10.1002/anie.201209833] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2012] [Indexed: 11/07/2022]
Abstract
It has been 60 years since Eschenmoser and Frey disclosed the archetypal CC fragmentation reaction. New fragmentations and several variants of the original quickly followed. Many of these variations, which include the Beckmann, Grob, Wharton, Marshall, and Eschenmoser-Tanabe fragmentations, have been reviewed over the intervening years. A close examination of the origins of fragmentation has not been described. Recently, useful new methods have flourished, particularly fragmentations that give alkynes and allenes, and such reactions have been applied to a range of complex motifs and natural products. This Review traces the origins of fragmentation reactions and provides a summary of the methods, applications, and new insights of heterolytic CC fragmentation reactions advanced over the last 20 years.
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Affiliation(s)
- Michael A Drahl
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854 (USA)
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20
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Drahl MA, Manpadi M, Williams LJ. C-C-Fragmentierung: Herkunft und jüngste Anwendungen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209833] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Zhang L, Bi X, Guan X, Li X, Liu Q, Barry BD, Liao P. Chemoselective Oxidative C(CO)C(methyl) Bond Cleavage of Methyl Ketones to Aldehydes Catalyzed by CuI with Molecular Oxygen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305010] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Zhang L, Bi X, Guan X, Li X, Liu Q, Barry BD, Liao P. Chemoselective Oxidative C(CO)C(methyl) Bond Cleavage of Methyl Ketones to Aldehydes Catalyzed by CuI with Molecular Oxygen. Angew Chem Int Ed Engl 2013; 52:11303-7. [DOI: 10.1002/anie.201305010] [Citation(s) in RCA: 158] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 08/08/2013] [Indexed: 12/21/2022]
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23
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Hoang TT, Dudley GB. Synthesis of High-Value 1,6-Enynes by Tandem Fragmentation/Olefination. Org Lett 2013; 15:4026-9. [DOI: 10.1021/ol401839e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Tung T. Hoang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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24
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R.R. R, Raihan MJ, Janreddy D, Kavala V, Kuo CW, Kuo TS, Chen ML, He CH, Yao CF. Selectfluor-Mediated Fluorination and C-C Bond Cleavage of Cyclohexene-Fused IsoxazolineN-Oxides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300599] [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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25
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26
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Lisboa MP, Jones DM, Dudley GB. Formal Synthesis of Palmerolide A, Featuring Alkynogenic Fragmentation and syn-Selective Vinylogous Aldol Chemistry. Org Lett 2013; 15:886-9. [DOI: 10.1021/ol400014e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Marilda P. Lisboa
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - David M. Jones
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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27
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Jabre ND, Brewer M. Stereoelectronic effects in the fragmentation of γ-silyloxy-β-hydroxy-α-diazocarbonyl compounds. J Org Chem 2012; 77:9910-4. [PMID: 23066902 PMCID: PMC3489280 DOI: 10.1021/jo301944t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of γ-silyloxy-β-hydroxy-α-diazocarbonyl compounds were prepared as fragmentation substrates to probe the hypothesis that steric interactions between the diazo ester and adjacent silyloxy group can play an important role in determining the success of fragmentations. Proper stereoelectronic alignment of the diazo ester and the departing hydroxyl group is necessary for productive fragmentation to occur.
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Affiliation(s)
- Nitinkumar D. Jabre
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont, 05405, United States
| | - Matthias Brewer
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont, 05405, United States
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28
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Chassaing S, Specklin S, Weibel JM, Pale P. Vinyl triflates derived from 1,3-dicarbonyl compounds and analogs: access and applications to organic synthesis. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.107] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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29
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Raihan MJ, Kavala V, Guan QZ, Kuo CW, Kataria S, Shishodia S, Janreddy D, Habib PM, Yao CF. The Halonium Ion-Mediated CC Bond Cleavage of Cyclohexene-Fused Isoxazoline N-Oxides. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200217] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Tummatorn J, Batsomboon P, Clark RJ, Alabugin IV, Dudley GB. Strain-promoted azide-alkyne cycloadditions of benzocyclononynes. J Org Chem 2012; 77:2093-7. [PMID: 22316100 DOI: 10.1021/jo300188y] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Preliminary studies related to the design and development of new cycloalkyne reagents for metal-free click coupling are reported. Cyclononynes are more stable than cyclooctynes, and the robust benzocyclononyne platform offers spontaneous reactivity toward azides at rates competitive with other azidophiles that have been employed for metal-free click coupling. Benzocyclononynes (e.g., 1) provide valuable insight into the design of new cycloalkynes for strain-promoted azide-alkyne cycloaddition (SPAAC) couplings for applications in which side reactions and decomposition of the reagent must be kept to a minimum.
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Affiliation(s)
- Jumreang Tummatorn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA
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31
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Tiwari B, Zhang J, Chi YR. Facile Access to Chiral Ketones through Metal-Free Oxidative CC Bond Cleavage of Aldehydes by O2. Angew Chem Int Ed Engl 2012; 51:1911-4. [DOI: 10.1002/anie.201107473] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 11/17/2011] [Indexed: 11/09/2022]
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32
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Tiwari B, Zhang J, Chi YR. Facile Access to Chiral Ketones through Metal-Free Oxidative CC Bond Cleavage of Aldehydes by O2. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107473] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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33
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Gold B, Shevchenko NE, Bonus N, Dudley GB, Alabugin IV. Selective transition state stabilization via hyperconjugative and conjugative assistance: stereoelectronic concept for copper-free click chemistry. J Org Chem 2011; 77:75-89. [PMID: 22077877 DOI: 10.1021/jo201434w] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Dissection of stereoelectronic effects in the transition states (TSs) for noncatalyzed azide-alkyne cycloadditions suggests two approaches to selective transition state stabilization in this reaction. First, the formation of both 1,4- and 1,5-isomers is facilitated via hyperconjugative assistance to alkyne bending and C···N bond formation provided by antiperiplanar σ-acceptors at the propargylic carbons. In addition, the 1,5-TS can be stabilized via attractive C-H···F interactions. Although the two effects cannot stabilize the same transition state for the cycloaddition to α,α-difluorocyclooctyne (DIFO), they can act in a complementary, rather than competing, fashion in acyclic alkynes where B3LYP calculations predict up to ∼1 million-fold rate increase relative to 2-butyne. This analysis of stereoelectronic effects is complemented by the distortion analysis, which provides another clear evidence of selective TS stabilization. Changes in electrostatic potential along the reaction path revealed that azide polarization may create unfavorable electrostatic interactions (i.e., for the 1,5-regioisomer formation from 1-fluoro-2-butyne and methyl azide). This observation suggests that more reactive azides can be designed via manipulation of charge distribution in the azide moiety. Combination of these effects with the other activation strategies should lead to the rational design of robust acyclic and cyclic alkyne reagents for fast and tunable "click chemistry". Further computational and experimental studies confirmed the generality of the above accelerating effects and compared them with the conjugative TS stabilization by π-acceptors.
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Affiliation(s)
- Brian Gold
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA
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34
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Roy S, Davydova MP, Pal R, Gilmore K, Tolstikov GA, Vasilevsky SF, Alabugin IV. Dissecting Alkynes: Full Cleavage of Polarized C≡C Moiety via Sequential Bis-Michael Addition/Retro-Mannich Cascade. J Org Chem 2011; 76:7482-90. [DOI: 10.1021/jo201259j] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Saumya Roy
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | | | - Runa Pal
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Kerry Gilmore
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | | | | | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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35
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Xu D, Drahl MA, Williams LJ. Toward an integrated route to the vernonia allenes and related sesquiterpenoids. Beilstein J Org Chem 2011; 7:937-43. [PMID: 21804888 PMCID: PMC3135329 DOI: 10.3762/bjoc.7.104] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 06/09/2011] [Indexed: 11/23/2022] Open
Abstract
The synthesis of a model endocyclic allene related to the vernonia allenes is described. Fragmentation of a suitable decalin derivative gave the simplified germacrane scaffold. Computational analysis of this and related substrates provides insight into the stereoelectronic requirements of C-C fragmentation. The overall strategy to access these and other sesquiterpenes and the key steps in the present sequence are also discussed.
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Affiliation(s)
- Da Xu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
| | - Michael A Drahl
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
| | - Lawrence J Williams
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, NJ 08854, USA
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36
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Boltukhina EV, Sheshenev AE, Lyapkalo IM. Convenient synthesis of non-conjugated alkynyl ketones from keto aldehydes by a chemoselective one-pot nonaflation—base catalyzed elimination sequence. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Han C, Kim EH, Colby DA. Cleavage of carbon-carbon bonds through the mild release of trifluoroacetate: generation of α,α-difluoroenolates for aldol reactions. J Am Chem Soc 2011; 133:5802-5. [PMID: 21443226 DOI: 10.1021/ja202213f] [Citation(s) in RCA: 139] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The selective cleavage of carbon-carbon bonds is a significant challenge in synthetic chemistry, yet this strategy can be a powerful way to generate reactive intermediates. We have discovered that, through the facile release of trifluoroacetate which occurs by C-C bond scission, difluoroenolates can be generated under very mild reaction conditions. Unlike existing reactions, this method is not limited to a small group of fluorinated building blocks. We have applied this process to the aldol reaction to install difluoromethylene groups.
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Affiliation(s)
- Changho Han
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States
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38
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Yang J, Tummatorn J, Slegeris R, Tlais SF, Dudley GB. Synthesis of the tricyclic core of aldingenin B by oxidative cyclo-ketalization of an alkyne-diol. Org Lett 2011; 13:2065-7. [PMID: 21391664 DOI: 10.1021/ol200421s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The preparation and selenium-mediated cyclo-ketalization of an alkyne-diol is described as a model study for the synthesis of aldingenin B. The oxidative cyclization is a simplifying transformation for aldingenin B, as it provides a convenient method for generating the tricylic core of the natural product from a functionalized cyclohexane.
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Affiliation(s)
- Jingyue Yang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA
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39
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Tummatorn J, Dudley GB. Generation of medium-ring cycloalkynes by ring expansion of vinylogous acyl triflates. Org Lett 2011; 13:1572-5. [PMID: 21348490 DOI: 10.1021/ol2003308] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reductive cyclization of aryl and vinyl iodides tethered to vinylogous acyl triflates (VATs) induces a ring-expanding fragmentation to provide cyclic alkynyl ketones, including strained nine-membered cycloalkynes, in fair to excellent yield. The tandem cyclization/C-C bond-cleavage is initiated under carefully optimized conditions by halogen-metal exchange in the presence of carbonyl and vinyl triflate functionality. A modified protocol for alkylation of 1,3-cyclohexanedione is described for preparing the relevant VAT substrates.
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Affiliation(s)
- Jumreang Tummatorn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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40
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Hierold J, Hsia T, Lupton DW. The Grob/Eschenmoser fragmentation of cycloalkanones bearing β-electron withdrawing groups: a general strategy to acyclic synthetic intermediates. Org Biomol Chem 2011; 9:783-92. [DOI: 10.1039/c0ob00632g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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41
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Tummatorn J, Dudley GB. Stereodefined Homopropargyl Amines by Tandem Nucleophilic Addition/Fragmentation of Dihydropyridone Triflates. Org Lett 2010; 13:158-60. [DOI: 10.1021/ol102760q] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jumreang Tummatorn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
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42
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Saget T, Cramer N. Heteroatom-Nucleophile-Induced CC Fragmentations: Synthesis of Allenes and Entry to Domino Reactions. Angew Chem Int Ed Engl 2010; 49:8962-5. [DOI: 10.1002/anie.201004795] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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43
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Jones DM, Dudley GB. An open-and-shut strategy: preparation of benzo-fused indanes by ring-opening of a vinylogous acyl triflate and metal-catalyzed Asao–Yamamoto benzannulation. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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44
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Jones DM, Lisboa MP, Kamijo S, Dudley GB. Ring Opening of Cyclic Vinylogous Acyl Triflates Using Stabilized Carbanion Nucleophiles: Claisen Condensation Linked to Carbon−Carbon Bond Cleavage. J Org Chem 2010; 75:3260-7. [DOI: 10.1021/jo100249g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- David M. Jones
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
| | - Marilda P. Lisboa
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
| | - Shin Kamijo
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
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45
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Prantz K, Mulzer J. Synthetic Applications of the Carbonyl Generating Grob Fragmentation. Chem Rev 2010; 110:3741-66. [DOI: 10.1021/cr900386h] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kathrin Prantz
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
| | - Johann Mulzer
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, A-1090 Vienna, Austria
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46
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Bayir A, Draghici C, Brewer M. Preparation of Tethered Aldehyde Ynoates and Ynones by Ring Fragmentation of Cyclic γ-Oxy-β-hydroxy-α-diazo Carbonyls. J Org Chem 2009; 75:296-302. [DOI: 10.1021/jo902405f] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ali Bayir
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont 05405
| | - Cristian Draghici
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont 05405
| | - Matthias Brewer
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont 05405
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47
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Kolakowski RV, Manpadi M, Zhang Y, Emge TJ, Williams LJ. Allene Synthesis via C−C Fragmentation: Method and Mechanistic Insight. J Am Chem Soc 2009; 131:12910-1. [DOI: 10.1021/ja906189h] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert V. Kolakowski
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
| | - Madhuri Manpadi
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
| | - Yue Zhang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
| | - Thomas J. Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
| | - Lawrence J. Williams
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
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48
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Babinski D, Soltani O, Frantz DE. Stereoselective synthesis of acetoacetate-derived enol triflates. Org Lett 2008; 10:2901-4. [PMID: 18540630 DOI: 10.1021/ol8010002] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A highly stereoselective method for preparing ( Z)- and ( E)-enol triflates derived from substituted acetoacetate derivatives is described. The salient feature of this methodology is the use of Schotten-Baumann-type conditions to control enolate geometry using either aqueous LiOH ( Z-selective) or aqueous (Me)(4)NOH ( E-selective) in combination with triflic anhydride to provide a practical and predictable approach to these valuable substrates.
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Affiliation(s)
- David Babinski
- Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, USA
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49
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Tummatorn J, Dudley GB. Ring Opening/Fragmentation of Dihydropyrones for the Synthesis of Homopropargyl Alcohols. J Am Chem Soc 2008; 130:5050-1. [DOI: 10.1021/ja801018r] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jumreang Tummatorn
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306–4390, and Department of Chemistry, Faculty of Science, Chulalongkorn University, Phyathai Road, Bangkok 10330, Thailand
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306–4390, and Department of Chemistry, Faculty of Science, Chulalongkorn University, Phyathai Road, Bangkok 10330, Thailand
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50
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Gu Z, Ma S. Studies on Thermal Reactivity of β-(1,2-Allenyl)butenolides and 2-Allyl-3-allenylcyclohex-2-enones. Chemistry 2008; 14:2453-64. [DOI: 10.1002/chem.200701171] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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