1
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Shan C, Li R, Wang X. Efficient construction of a β-naphthol library under continuous flow conditions. RSC Adv 2024; 14:2673-2677. [PMID: 38226147 PMCID: PMC10789443 DOI: 10.1039/d3ra08660g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 01/04/2024] [Indexed: 01/17/2024] Open
Abstract
A β-naphthol library has been efficiently constructed utilizing a mild continuous flow procedure, relying on a tandem Friedel-Crafts reaction and starting from readily available arylacetyl chloride and alkynes. Multiple functionalized β-naphthols can be acquired within 160 s in generally high yields (up to 83%). Using an electron-rich phenylacetyl chloride derivative (4-OH- or 4-MeO-) provides spirofused triene dione as the primary product. A scale-up preparation affords a throughput of 4.70 g h-1, indicating potential large-scale application. Herein, we present a rapid, reliable, and scalable method to obtain various β-naphthols in the compound library.
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Affiliation(s)
- Chao Shan
- Heze University Heze Shandong Province 274015 China
| | - Ranran Li
- Heze University Heze Shandong Province 274015 China
| | - Xinchao Wang
- Heze University Heze Shandong Province 274015 China
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2
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Shindo M, Iwata T. Cycloaddition Initiated by Ynolates: High-Energy Dianion Equivalents as a Molecular Glue. Synlett 2021. [DOI: 10.1055/s-0040-1719857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractIn this paper, ynolate-initiated cycloaddition (annulation) to form a range of carbocycles and heterocycles is described. Ynolates consist of a ketene anion equivalent, which contains both nucleophilic and electrophilic moieties, and a carbodianion equivalent that achieves double addition. Hence, in addition to the usual [n+2] cycloaddition, ynolates can perform formal [n+1]-type annulations. Their high-energy performance has been demonstrated by their triple addition to arynes to generate triptycenes, in which the C–C triple bond of ynolates is cleaved. The synthetic applications of these methods, including natural products synthesis, are also described.1 Introduction2 Preparation of Ynolates2.1 Double Lithiation2.2 Flow Synthesis2.3 Double Deprotonation3 [2+2] Cycloaddition to C=O Bond3.1 To Aldehydes and Ketones3.2 Sequential Cycloaddition4 [2+2] Cycloaddition to Imino Groups
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3
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Shindo M, Iwata T. Synthesis, Stereochemical Stability, and Biological Activity of Stemonamine and Its Related Stemona Alkaloids. HETEROCYCLES 2019. [DOI: 10.3987/rev-19-902] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Peng C, Zhang J, Xue J, Li S, Wang XN, Chang J. Lewis Acids Catalyzed Annulations of Ynamides with Acyl Chlorides for Constructing 4-Amino-2-naphthol Derivatives and 3-Aminocyclobutenones. J Org Chem 2018; 83:9256-9266. [PMID: 29978700 DOI: 10.1021/acs.joc.8b01255] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Two complementary synthetic manifestations leading to highly substituted 1-naphthol and 2-naphthol derivatives via Lewis acids catalyzed annulations of ynamides with acyl chlorides are described here. A one-pot synthesis of 4-amino-2-naphthol derivatives is accomplished via a ZnI2-catalyzed tandem Friedel-Crafts reaction sequence. While in the presence of Pd(0) catalyst, a [2 + 2] cycloaddition reaction of ynamides with monosubstituted ketenes that were generated from the dehydrohalogenation of suitable acyl chlorides leads to efficient formation of 3-aminocyclobutenones, which were subsequently modified to generate 3-amino-1-naphthols in excellent yields.
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Affiliation(s)
- Cheng Peng
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Jingyi Zhang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Jian Xue
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Siqi Li
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Xiao-Na Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
| | - Junbiao Chang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, and College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , P. R. China
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5
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Nimnual P, Norseeda K, Akkachairin B, Tummatorn J, Laohapaisan P, Supantanapong N, Chuangsoongnern P, Thongsornkleeb C, Sittihan S, Ruchirawat S, Rodphon W. Synthesis of β‐Naphthols and Naphthofuranones from
ortho
‐Alkynylarylketones via Sequential AgTFA‐Catalyzed Ketonization–Intramolecular Aldol Condensation: A Total Synthesis of Negundin A. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Phongprapan Nimnual
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Krissada Norseeda
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Bhornrawin Akkachairin
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Jumreang Tummatorn
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
- Laboratory of Medicinal ChemistryChulabhorn Research Institute 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Pavitra Laohapaisan
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Nantamon Supantanapong
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Pennapa Chuangsoongnern
- Laboratory of Medicinal ChemistryChulabhorn Research Institute 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Charnsak Thongsornkleeb
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
- Laboratory of Organic SynthesisChulabhorn Research Institute 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Satapanawat Sittihan
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Somsak Ruchirawat
- Program on Chemical BiologyChulabhorn Graduate Institute, Center of Excellence on Environmental Health and Toxicology (EHT), Ministry of Education 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
- Laboratory of Medicinal ChemistryChulabhorn Research Institute 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
| | - Warabhorn Rodphon
- Laboratory of Medicinal ChemistryChulabhorn Research Institute 54 Kamphaeng Phet 6, Laksi Bangkok 10210 Thailand
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6
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Fujita S, Nishikawa K, Iwata T, Tomiyama T, Ikenaga H, Matsumoto K, Shindo M. Asymmetric Total Synthesis of (−)-Stemonamine and Its Stereochemical Stability. Chemistry 2018; 24:1539-1543. [DOI: 10.1002/chem.201706057] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Satoshi Fujita
- Interdisciplinary Graduate School of Engineering Sciences; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Keisuke Nishikawa
- Institute for Materials Chemistry and Engineering; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Takayuki Iwata
- Institute for Materials Chemistry and Engineering; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Taishi Tomiyama
- Interdisciplinary Graduate School of Engineering Sciences; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Hiroshi Ikenaga
- Interdisciplinary Graduate School of Engineering Sciences; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Kenji Matsumoto
- Institute for Materials Chemistry and Engineering; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering; Kyushu University, Kasuga-koen; Kasuga 816-8580 Japan
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7
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Shindo M, Iwata T, Tomiyama T, Fujita S. First Asymmetric Total Synthesis of (-)-Isostemonamine and Kinetic Analysis of Its Isomerizations. HETEROCYCLES 2018. [DOI: 10.3987/com-18-s(t)71] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Umezu S, dos Passos Gomes G, Yoshinaga T, Sakae M, Matsumoto K, Iwata T, Alabugin I, Shindo M. Regioselective One‐Pot Synthesis of Triptycenes via Triple‐Cycloadditions of Arynes to Ynolates. Angew Chem Int Ed Engl 2016; 56:1298-1302. [DOI: 10.1002/anie.201609111] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2016] [Revised: 11/11/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Satoshi Umezu
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | | | - Tatsuro Yoshinaga
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Mikei Sakae
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Kenji Matsumoto
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Takayuki Iwata
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Igor Alabugin
- Department of Chemistry and Biochemistry Florida State University Tallahassee FL 32310 USA
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
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9
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Umezu S, dos Passos Gomes G, Yoshinaga T, Sakae M, Matsumoto K, Iwata T, Alabugin I, Shindo M. Regioselective One‐Pot Synthesis of Triptycenes via Triple‐Cycloadditions of Arynes to Ynolates. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201609111] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Satoshi Umezu
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | | | - Tatsuro Yoshinaga
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Mikei Sakae
- Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Kenji Matsumoto
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Takayuki Iwata
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
| | - Igor Alabugin
- Department of Chemistry and Biochemistry Florida State University Tallahassee FL 32310 USA
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering Kyushu University 6-1 Kasuga-koen Kasuga 816-8580 Japan
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10
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Yanai H, Ishii N, Matsumoto T. Synthesis of 1,2,3,4-tetrasubstituted naphthalenes through a cascade reaction triggered by silyl acetal activation. Chem Commun (Camb) 2016; 52:7974-7. [DOI: 10.1039/c6cc03510h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through a fluoride-induced cascade reaction of lactol silyl ethers, 1,2,3,4-tetrasubstituted naphthalenes were synthesized in a regioselective manner.
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Affiliation(s)
- Hikaru Yanai
- School of Pharmacy
- Tokyo University of Pharmacy and Life Sciences
- Hachioji
- Japan
| | - Nobuyuki Ishii
- School of Pharmacy
- Tokyo University of Pharmacy and Life Sciences
- Hachioji
- Japan
| | - Takashi Matsumoto
- School of Pharmacy
- Tokyo University of Pharmacy and Life Sciences
- Hachioji
- Japan
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11
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Kim HY, Oh K. A Facile Access to 4-Substituted-2-naphthols via a Tandem Friedel–Crafts Reaction: A β-Chlorovinyl Ketone Pathway. Org Lett 2014; 16:5934-6. [DOI: 10.1021/ol502951v] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hun Young Kim
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 156-756, Republic of Korea
| | - Kyungsoo Oh
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak, Seoul 156-756, Republic of Korea
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12
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Zhang H, Li C, Xie G, Wang B, Zhang Y, Wang J. Zn(II)- or Rh(I)-Catalyzed Rearrangement of Silylated [1,1′-Bi(cyclopropan)]-2′-en-1-ols. J Org Chem 2014; 79:6286-93. [DOI: 10.1021/jo5010923] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hang Zhang
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Changkun Li
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Guojun Xie
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Bo Wang
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Yan Zhang
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
| | - Jianbo Wang
- Beijing
National Laboratory of Molecular Sciences (BNLMS), Key Laboratory
of Bioorganic Chemistry and Molecular Engineering of Ministry of Education,
College of Chemistry, Peking University, Beijing 100871, China
- State
Key Laboratory of Organometallic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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13
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14
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Cabrera-Pardo JR, Chai DI, Kozmin SA. Silver-Promoted Benzannulations of Siloxy Alkynes with Pyridinium and Isoquinolinium Salts. Adv Synth Catal 2013; 355:2495-2498. [PMID: 24653670 DOI: 10.1002/adsc.201300443] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We describe the development of efficient benzannulations of siloxy alkynes with pyridinium and isoquinolinium salts. Such reactions are successfully promoted by a stoichiometric amount of silver(I) benzolate under mild reaction conditions. This process proceeds via a formal inverse-electron demand Diels-Alder reaction, followed by fragmentation of the initially produced bicyclic adducts to deliver a range of synthetically useful phenols and naphthols.
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Affiliation(s)
- Jaime R Cabrera-Pardo
- Chicago Tri-Institutional Center for Chemical Methods and Library Development. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA, ; phone: (+1)-773-702-6886
| | - David I Chai
- Chicago Tri-Institutional Center for Chemical Methods and Library Development. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA, ; phone: (+1)-773-702-6886
| | - Sergey A Kozmin
- Chicago Tri-Institutional Center for Chemical Methods and Library Development. Department of Chemistry, University of Chicago, Chicago, IL 60637, USA, ; phone: (+1)-773-702-6886
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15
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Türkmen YE, Montavon TJ, Kozmin SA, Rawal VH. Silver-catalyzed formal inverse electron-demand Diels-Alder reaction of 1,2-diazines and siloxy alkynes. J Am Chem Soc 2012; 134:9062-5. [PMID: 22607029 PMCID: PMC3415592 DOI: 10.1021/ja302537j] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A highly effective silver-catalyzed formal inverse electron-demand Diels-Alder reaction of 1,2-diazines and siloxy alkynes has been developed. The reactions provide ready access to a wide range of siloxy naphthalenes and anthracenes, which are formed in good to high yields, under mild reaction conditions, using low catalyst loadings.
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Affiliation(s)
- Yunus E. Türkmen
- Chicago Tri-Institutional Center for Chemical Methods and Library Development, Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Timothy J. Montavon
- Chicago Tri-Institutional Center for Chemical Methods and Library Development, Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Sergey A. Kozmin
- Chicago Tri-Institutional Center for Chemical Methods and Library Development, Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
| | - Viresh H. Rawal
- Chicago Tri-Institutional Center for Chemical Methods and Library Development, Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States
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16
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Wang X, Zhang Y, Ye S. Enantioselective Synthesis of Spirocyclic Oxindole‐β‐lactones
via
N‐Heterocyclic Carbene‐Catalyzed Cycloaddition of Ketenes and Isatins. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000187] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xiao‐Na Wang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86)‐10‐6255‐4449
| | - Yan‐Yong Zhang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86)‐10‐6255‐4449
| | - Song Ye
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China, Fax: (+86)‐10‐6255‐4449
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17
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Luján-Montelongo JA, Ávila-Zárraga JG. Palladium (II) catalyzed 5-endo epoxynitrile cyclizations: total syntheses of enokipodins A and B. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.072] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Shindo M, Yoshimura Y, Hayashi M, Soejima H, Yoshikawa T, Matsumoto K, Shishido K. Synthesis of Multisubstituted Furans, Pyrroles, and Thiophenes via Ynolates. Org Lett 2007; 9:1963-6. [PMID: 17439135 DOI: 10.1021/ol0705200] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient synthetic method for the preparation of multisubstituted furans, thiophenes, and pyrroles using ynolates was developed. This novel formal [4 + 1] annulation by C2-C3 and C3-C4 bond formations includes cycloaddition, cyclization, decarboxylation, and dehydration as key steps.
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Affiliation(s)
- Mitsuru Shindo
- Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Japan.
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19
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Bull J, Hutchings M, Quayle P. A Remarkably Simple and Efficient Benzannulation Reaction. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200603416] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Bull JA, Hutchings MG, Quayle P. A Remarkably Simple and Efficient Benzannulation Reaction. Angew Chem Int Ed Engl 2007; 46:1869-72. [PMID: 17450613 DOI: 10.1002/anie.200603416] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- James A Bull
- School of Chemistry, University of Manchester, Manchester M13 9PL, UK
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21
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Chavan SP, Dhawane AN, Kalkote UR. A facile total synthesis of (±)-α-cuparenone employing diallylation and RCM as key steps. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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23
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Shindo M, Sato Y, Yoshikawa T, Koretsune R, Shishido K. Stereoselective olefination of unfunctionalized ketones via ynolates. J Org Chem 2004; 69:3912-6. [PMID: 15153025 DOI: 10.1021/jo0497813] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ynolates react with ketones at room temperature to afford alpha,beta,beta-trisubstituted acrylates (tetrasubstituted olefins) with 2:1-8:1 geometrical selectivities. This can be regarded as a new olefination reaction of ketones giving tetrasubstituted olefins in good yield, even in the case of sterically hindered substrates. The reaction mechanism involves cycloaddition of ynolates with a carbonyl group and subsequent thermal electrocyclic ring-opening of the resulting beta-lactone enolates. The stereoselectivity is determined in the ring-opening, which is regulated by torquoselectivity. In this paper, we describe the scope and limitations of olefination of ketones via ynolates and discuss the stereocontrol mechanism.
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Affiliation(s)
- Mitsuru Shindo
- Institute for Medicinal Resources, University of Tokushima, Sho-machi 1, Tokushima 770-8505, Japan.
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24
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Romo D, Wang Y, L. Tennyson R. β-Lactones: Intermediates for Natural Product Total Synthesis and New Transformations. HETEROCYCLES 2004. [DOI: 10.3987/rev-04-sr(p)3] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Shindo M, Sato Y, Koretsune R, Yoshikawa T, Matsumoto K, Itoh K, Shishido K. Synthesis of alpha,alpha-dibromo esters as precursors of ynolates. Chem Pharm Bull (Tokyo) 2003; 51:477-8. [PMID: 12673013 DOI: 10.1248/cpb.51.477] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aliphatic alpha,alpha-dibromo esters, precursors of ynolates, were synthesized via bromination of lithium alpha-bromo ester enolates with 1,2-dibromotetrafluoroethane in good yields. alpha-Trimethylsilyl-alpha,alpha-dibromo esters were synthesized via radical bromination.
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Affiliation(s)
- Mitsuru Shindo
- Institute for Medicinal Resources, University of Tokushima, 1 Sho-machi, Japan.
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de Koning CB, Rousseau AL, van Otterlo WA. Modern methods for the synthesis of substituted naphthalenes. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(02)01424-2] [Citation(s) in RCA: 200] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Turecek F, Vivekananda S, Sadílek M, Polásek M. Lactone enols are stable in the gas phase but highly unstable in solution. J Am Chem Soc 2002; 124:13282-9. [PMID: 12405857 DOI: 10.1021/ja0202457] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2-Hydroxyoxol-2-ene (C(5)-1), the enol tautomer of gamma-butyrolactone, was generated in the gas phase as the first representative of the hitherto elusive class of lactone enols and shown by neutralization-reionization mass spectrometry to be remarkably stable as an isolated species. Ab initio calculations by QCISD(T)/6-311+G(3df,2p) provided the enthalpies of formation, proton affinities, and gas-phase basicities for gaseous lactone enols with four- (C(4)-1), five- (C(5)-1), and six-membered rings (C(6)-1). The acid-base properties of C(4)-C(6) lactones and enols and reference carboxylic acid enols CH(2)=C(OH)(2) (3) and CH(2)=C(OH)OCH(3) (4) were also calculated in aqueous solution. The C(4)-C(6) lactone enols show gas-phase proton affinities in the range of 933-944 kJ mol(-)(1) and acidities in the range of 1401-1458 kJ mol(-)(1). In aqueous solution, the lactone enols are 15-20 orders of magnitude more acidic than the corresponding lactones, with enol pK(a) values increasing from 5.6 (C(4)-1) to 14.5 (C(6)-1). Lactone enols are moderately weak bases in water with pK(BH) in the range of 3.9-8.1, whereas the lactones are extremely weak bases of pK(BH) in the range of -10.5 to -17.4. The acid-base properties of lactone enols point to their high reactivity in protic solvents and explain why no lactone enols have been detected thus far in solution studies.
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Affiliation(s)
- Frantisek Turecek
- Department of Chemistry, Bagley Hall, Box 351700, University of Washington, Seattle, Washington 98195-1700, USA.
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Shindo M, Sato Y, Shishido K. An ynolate-initiated tandem process giving cyclopentenones: total synthesis of cucumin E. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01015-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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