1
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Malone JA, Philkhana SC, Stepherson JR, Badmus FO, Fronczek FR, Kartika R. Copper(I)-Catalyzed Synthesis of Unsymmetrical All-Carbon Bis-Quaternary Centers at the Opposing α-Carbons of Cyclohexanones. Org Lett 2022; 24:4810-4815. [PMID: 35767696 PMCID: PMC9490817 DOI: 10.1021/acs.orglett.2c01890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
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We describe a new
synthetic reaction that generates all-carbon
bis-quaternary centers at the opposing side of α-carbons in
cyclohexanone with four different substituents in a controlled manner.
Catalyzed by Cu(MeCN)4BF4 salt, this chemistry
is proposed to proceed via an intermediacy of unsymmetrical O-allyl oxyallyl cations, which undergo a sequence of regioselective
nucleophilic addition with substituted indoles and diastereoselective
Claisen rearrangement in a single synthetic operation. The stereochemical
outcome of the products features the cis diastereorelationship
between the two aryl groups at the α,α′-positions.
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Affiliation(s)
- Joshua A Malone
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Satish Chandra Philkhana
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Jacob R Stepherson
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Fatimat O Badmus
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Frank R Fronczek
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
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2
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Yokoyama H, Dokai Y, Kimaru N, Saito K, Yamada T. Lewis Acid-catalyzed Decarboxylative Cyanation of Cyclic Enol Carbonates — Access to Multi-substituted β-Ketonitriles —. CHEM LETT 2022. [DOI: 10.1246/cl.220017] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Haruki Yokoyama
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Yoichi Dokai
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Natsuki Kimaru
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Kodai Saito
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Tohru Yamada
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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3
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Aota Y, Doko Y, Kano T, Maruoka K. Brønsted Acid-Catalyzed Intramolecular α-Arylation of Ketones with Phenolic Nucleophiles via Oxy-Allyl Cation Intermediates. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000169] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yusuke Aota
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo 606-8502 Kyoto Japan
| | - Yuki Doko
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo 606-8502 Kyoto Japan
| | - Taichi Kano
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo 606-8502 Kyoto Japan
| | - Keiji Maruoka
- Department of Chemistry; Graduate School of Science; Kyoto University; Sakyo 606-8502 Kyoto Japan
- Graduate School of Pharmaceutical Sciences; Kyoto University; Sakyo 606-8501 Kyoto Japan
- School of Chemical Engineering and Light Industry; Guangdong University of Technology; 510006 Guangzhou China
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4
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Huang WH, Huang GB, Zhu WR, Weng J, Lu G. Transition metal-free synthesis of α-aryl ketones via oxyallyl cation capture with arylboronic acids. Org Chem Front 2020. [DOI: 10.1039/d0qo00447b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
α-Arylated ketones were accessed via oxyallyl cation capture with arylboronic acids in good yields with broad substrate tolerance.
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Affiliation(s)
- Wei-Hua Huang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Gong-Bin Huang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Wen-Run Zhu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Jiang Weng
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Gui Lu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
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5
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Nguyen TN, Setthakarn K, May JA. Oxyallyl Cation Capture via Electrophilic Deborylation of Organoboronates: Access to α, α'-Substituted Cyclic Ketones. Org Lett 2019; 21:7837-7840. [PMID: 31536365 DOI: 10.1021/acs.orglett.9b02831] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
An umpolung strategy to synthesize α,α'-substituted cyclic ketones through the nucleophilic addition of organoboronates to α-hydroxyl silyl enol ethers is described. The reaction proceeds via the trapping of in situ generated oxyallyl cations via the electrophilic deborylation of C(sp2) and C(sp) borates. This efficient and straightforward method provides direct access to α-substituted silyl enol ethers in high yield with complete regioselectivity. Desilylation in a one-pot procedure provides the corresponding α,α'-disubstituted ketones with high diastereoselectivity.
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Affiliation(s)
- Truong N Nguyen
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
| | - Krit Setthakarn
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
| | - Jeremy A May
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
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6
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Zhang W, Chu J, Cyr AM, Yueh H, Brown LE, Wang TT, Pelletier J, Porco JA. Intercepted Retro-Nazarov Reaction: Syntheses of Amidino-Rocaglate Derivatives and Their Biological Evaluation as eIF4A Inhibitors. J Am Chem Soc 2019; 141:12891-12900. [PMID: 31310112 PMCID: PMC6693944 DOI: 10.1021/jacs.9b06446] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Rocaglates are a family of natural products isolated from the genus Aglaia which possess a highly substituted cyclopenta[b]benzofuran skeleton and inhibit cap-dependent protein synthesis. Rocaglates are attractive compounds due to their potential for inhibiting tumor cell maintenance in vivo by specifically targeting eukaryotic initiation factor 4A (eIF4A) and interfering with recruitment of ribosomes to mRNA. In this paper, we describe an intercepted retro-Nazarov reaction utilizing intramolecular tosyl migration to generate a reactive oxyallyl cation on the rocaglate skeleton. Trapping of the oxyallyl cation with a diverse range of nucleophiles has been used to generate over 50 novel amidino-rocaglate (ADR) and amino-rocaglate derivatives. Subsequently, these derivatives were evaluated for their ability to inhibit cap-dependent protein synthesis where they were found to outperform previous lead compounds including the rocaglate hydroxamate CR-1-31-B.
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Affiliation(s)
- Wenhan Zhang
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States of America
| | - Jennifer Chu
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada, H3G 1Y6
| | - Andrew M. Cyr
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States of America
| | - Han Yueh
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States of America
| | - Lauren E. Brown
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States of America
| | - Tony T. Wang
- Laboratory of Vector-borne Viral Diseases, Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20903, USA
| | - Jerry Pelletier
- Department of Biochemistry, McGill University, Montreal, Quebec, Canada, H3G 1Y6
- Department of Oncology, McGill University, Montreal, Quebec, Canada, H3G 1Y6
- Rosalind & Morris Goodman Cancer Research Centre, McGill University, Montreal, Quebec, Canada, H3G 1Y6
| | - John A. Porco
- Department of Chemistry, Center for Molecular Discovery (BU-CMD), Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States of America
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7
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Bresnahan CG, Taylor-Edinbyrd KA, Cleveland AH, Malone JA, Dange NS, Milet A, Kumar R, Kartika R. Mechanistic Perspectives in the Regioselective Indole Addition to Unsymmetrical Silyloxyallyl Cations. J Org Chem 2019; 84:7166-7174. [PMID: 31050428 DOI: 10.1021/acs.joc.9b00853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Our investigations on the reaction mechanism to account for regioselectivity on the addition of indoles to unsymmetrical silyloxyallyl cations are reported. Using both experimental and computational methods, we confirmed the significance of steric effects from the silyl ether group toward directing the inward approach of indoles, leading to nucleophilic attack at the less substituted electrophilic α'-carbon. The role of residual water toward accelerating the rate of reaction is established through stabilization of the participating silyloxyallyl cation.
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Affiliation(s)
- Caitlin G Bresnahan
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Kiara A Taylor-Edinbyrd
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Alexander H Cleveland
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Joshua A Malone
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Nitin S Dange
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Anne Milet
- Département de Chimie Moléculaire, Université Grenoble Alpes, CNRS, UMR 5250 , F-38000 Grenoble , France
| | - Revati Kumar
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Rendy Kartika
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
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8
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Alachouzos G, Frontier AJ. Cationic Cascade for Building Complex Polycyclic Molecules from Simple Precursors: Diastereoselective Installation of Three Contiguous Stereogenic Centers in a One-Pot Process. J Am Chem Soc 2018; 141:118-122. [DOI: 10.1021/jacs.8b11713] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Georgios Alachouzos
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
| | - Alison J. Frontier
- Department of Chemistry, University of Rochester, 414 Hutchison Hall, 100 Trustee Road, Rochester, New York 14627-0216, United States
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9
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Rajkumar S, Wang J, Zheng S, Wang D, Ye X, Li X, Peng Q, Yang X. Regioselective and Enantioselective Synthesis of β-Indolyl Cyclopentenamides by Chiral Anion Catalysis. Angew Chem Int Ed Engl 2018; 57:13489-13494. [PMID: 30129692 DOI: 10.1002/anie.201807010] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Revised: 08/05/2018] [Indexed: 11/09/2022]
Abstract
The regioselective and enantioselective synthesis of β-indolyl cyclopentenamides, a versatile chiral building block, by asymmetric addition of indoles to α,β-unsaturated iminium intermediates has been achieved through chiral anion catalysis. Key to the success of this methodology is the generation of a chiral anion-paired ketone-type α,β-unsaturated iminium intermediate from α-hydroxy enamides. Preliminary mechanistic studies and DFT calculations are consistent with a mechanism involving multiple, concurrent pathways for isomerization of the initially formed azaallylcation into the key α,β-unsaturated iminium intermediate, all mediated by the phosphoric acid catalyst.
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Affiliation(s)
- Subramani Rajkumar
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
| | - Jiawen Wang
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
| | - Sujuan Zheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Donglei Wang
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
| | - Xueqian Ye
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
| | - Xuejiao Li
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
| | - Qian Peng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Xiaoyu Yang
- School of Physical Science and Technology ShanghaiTech University, Shanghai, 201210, China
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10
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Rajkumar S, Wang J, Zheng S, Wang D, Ye X, Li X, Peng Q, Yang X. Regioselective and Enantioselective Synthesis of β-Indolyl Cyclopentenamides by Chiral Anion Catalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Subramani Rajkumar
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
| | - Jiawen Wang
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
| | - Sujuan Zheng
- State Key Laboratory of Elemento-Organic Chemistry; College of Chemistry; Nankai University; Tianjin 300071 China
| | - Donglei Wang
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
| | - Xueqian Ye
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
| | - Xuejiao Li
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
| | - Qian Peng
- State Key Laboratory of Elemento-Organic Chemistry; College of Chemistry; Nankai University; Tianjin 300071 China
| | - Xiaoyu Yang
- School of Physical Science and Technology ShanghaiTech University; Shanghai 201210 China
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11
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Yang B, Zhai X, Feng S, Shao Z. Dearomatization of naphthols using oxy-allyl cations: efficient construction of α-all-carbon quaternary center-containing 2-(2-oxocycloalkyl)cycloalkyl diketones. Org Chem Front 2018. [DOI: 10.1039/c8qo00783g] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An efficient strategy for the dearomatization of both α- and β-naphthols using in situ generated oxy-allyl cations is reported.
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Affiliation(s)
- Binmiao Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Xuejie Zhai
- Key Laboratory of Medicinal Chemistry for Natural Resource
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Shubo Feng
- Key Laboratory of Medicinal Chemistry for Natural Resource
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Zhihui Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
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12
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Domżalska A, Maziarz (Pluta) E, Furman B. A new synthesis of highly functionalized cyclohexenes via a vinylogous Ferrier-Petasis cyclization reaction. Tetrahedron 2017; 73:7030-41. [DOI: 10.1016/j.tet.2017.10.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Abstract
The enantioselective coupling of indoles with racemic α-tosyloxy ketones mediated by a chiral amino alcohol catalyst is studied with density functional theory (DFT) calculations. The addition of indole to an oxyallyl cation intrinsically favors the (S,S) and (R,R) stereoisomeric products through electrostatic interactions in the transition state. Our model shows that the enantioselectivity is controlled by the cyclohexane moiety of the catalyst; selectivity diminishes upon removal of the cyclohexane ring. Substitution to enhance the enantioselectivity of this reaction is proposed.
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Affiliation(s)
- Cyndi Qixin He
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
| | - Peiyuan Yu
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
| | - Yu-Hong Lam
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095-1569, United States
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14
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Malone JA, Van Houten JP, Ganiu MO, Nepal B, Kartika R. Brønsted Acid Catalyzed Synthesis of Functionalized 1,4- and 1,6-Dicarbonyl Monosilyl Enol Ethers under Operationally Practical Conditions. J Org Chem 2017; 82:10659-10664. [PMID: 28849920 DOI: 10.1021/acs.joc.7b01687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we report an improved protocol for the concise synthesis of functionalized 1,4- and 1,6-dicarbonyl-derived monosilyl enol ethers via ionization of α'-hydroxy silyl enol ethers to generate unsymmetrical silyloxyallyl cations that were subsequently captured by TBS silyl enolates. These transformations were efficiently performed in acetonitrile at room temperature by employing pyridinium triflate as a catalyst. Our new reaction conditions are operationally more practical and broaden the accessibility of various 1,4- and 1,6-dicarbonyl groups, which include diketone, ketoester, and ketothioester functionalities.
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Affiliation(s)
- Joshua A Malone
- Department of Chemistry 232 Choppin Hall Louisiana State University Baton Rouge, Louisiana 70803, United States
| | - Joshua P Van Houten
- Department of Chemistry 232 Choppin Hall Louisiana State University Baton Rouge, Louisiana 70803, United States
| | - Moshood O Ganiu
- Department of Chemistry 232 Choppin Hall Louisiana State University Baton Rouge, Louisiana 70803, United States
| | - Binod Nepal
- Department of Chemistry 232 Choppin Hall Louisiana State University Baton Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department of Chemistry 232 Choppin Hall Louisiana State University Baton Rouge, Louisiana 70803, United States
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15
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Affiliation(s)
- Marcel Schlegel
- Institut für Organische
Chemie, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
| | - Christoph Schneider
- Institut für Organische
Chemie, University of Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
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16
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Saputra MA, Dange NS, Cleveland AH, Malone JA, Fronczek FR, Kartika R. Regioselective Functionalization of Enamides at the α-Carbon via Unsymmetrical 2-Amidoallyl Cations. Org Lett 2017; 19:2414-2417. [DOI: 10.1021/acs.orglett.7b00962] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mirza A. Saputra
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
| | - Nitin S. Dange
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
| | - Alexander H. Cleveland
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
| | - Joshua A. Malone
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton
Rouge, Louisiana 70803, United States
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17
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Vinogradov MG, Turova OV, Zlotin SG. Nazarov reaction: current trends and recent advances in the synthesis of natural compounds and their analogs. Org Biomol Chem 2017; 15:8245-8269. [DOI: 10.1039/c7ob01981e] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recent applications of the Nazarov reaction to stereoselective synthesis of pharmacology-relevant cyclopentenone scaffolds are summarized.
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Affiliation(s)
- Maxim G. Vinogradov
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Olga V. Turova
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Sergei G. Zlotin
- N.D. Zelinsky Institute of Organic Chemistry
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
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18
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Williams CW, Shenje R, France S. Catalytic, Interrupted Formal Homo-Nazarov Cyclization with (Hetero)arenes: Access to α-(Hetero)aryl Cyclohexanones. J Org Chem 2016; 81:8253-67. [DOI: 10.1021/acs.joc.6b01312] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Corey W. Williams
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Raynold Shenje
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Stefan France
- School
of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
- Petit
Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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19
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Malone JA, Cleveland AH, Fronczek FR, Kartika R. Effects of Solvent and Residual Water on Enhancing the Reactivity of Six-Membered Silyloxyallyl Cations toward Nucleophilic Addition. Org Lett 2016; 18:4408-11. [DOI: 10.1021/acs.orglett.6b02194] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joshua A. Malone
- Department of Chemistry, 232 Choppin Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
| | - Alexander H. Cleveland
- Department of Chemistry, 232 Choppin Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
| | - Frank R. Fronczek
- Department of Chemistry, 232 Choppin Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department of Chemistry, 232 Choppin Hall, Louisiana State University, Baton
Rouge, Louisiana 70803, United States
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20
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Stepherson JR, Ayala CE, Tugwell TH, Henry JL, Fronczek FR, Kartika R. Carbazole Annulation via Cascade Nucleophilic Addition–Cyclization Involving 2-(Silyloxy)pentadienyl Cation. Org Lett 2016; 18:3002-5. [DOI: 10.1021/acs.orglett.6b01376] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jacob R. Stepherson
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Caitlan E. Ayala
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Thomas H. Tugwell
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Jeffrey L. Henry
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Frank R. Fronczek
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department
of Chemistry, 232 Choppin
Hall, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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21
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Ayala CE, Dange NS, Stepherson JR, Henry JL, Fronczek FR, Kartika R. Functionalization of Silyldienol Ethers at the γ-Position via 2-Silyloxypentadienyl Cations. Org Lett 2016; 18:1084-7. [PMID: 26867094 DOI: 10.1021/acs.orglett.6b00196] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This report describes Brønsted acid catalyzed de novo synthesis of silyldienol ethers bearing tetrasubstituted double bonds via an intermediacy of 2-silyloxypentadienyl cations. The reactivity of these novel cationic intermediates could be modulated and harnessed toward direct nucleophilic additions regioselectively at the γ-position to produce highly functionalized silyldienol ethers with tunable control of the resulting double bond geometry.
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Affiliation(s)
- Caitlan E Ayala
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Nitin S Dange
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Jacob R Stepherson
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Jeffrey L Henry
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Frank R Fronczek
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
| | - Rendy Kartika
- Department of Chemistry, Louisiana State University , 232 Choppin Hall, Baton Rouge, Louisiana 70803, United States
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22
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Liu C, Oblak EZ, Vander Wal MN, Dilger AK, Almstead DK, MacMillan DWC. Oxy-Allyl Cation Catalysis: An Enantioselective Electrophilic Activation Mode. J Am Chem Soc 2016; 138:2134-7. [PMID: 26797012 DOI: 10.1021/jacs.5b13041] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A generic activation mode for asymmetric LUMO-lowering catalysis has been developed using the long-established principles of oxy-allyl cation chemistry. Here, the enantioselective conversion of racemic α-tosyloxy ketones to optically enriched α-indolic carbonyls has been accomplished using a new amino alcohol catalyst in the presence of electron-rich indole nucleophiles. Kinetic studies reveal that the rate-determining step in this S(N)1 pathway is the catalyst-mediated α-tosyloxy ketone deprotonation step to form an enantiodiscriminant oxy-allyl cation prior to the stereodefining nucleophilic addition event.
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Affiliation(s)
- Chun Liu
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
| | - E Zachary Oblak
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
| | - Mark N Vander Wal
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
| | - Andrew K Dilger
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
| | - Danielle K Almstead
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
| | - David W C MacMillan
- Merck Center for Catalysis, Princeton University , Princeton, New Jersey 08544, United States
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23
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Stepherson JR, Fronczek FR, Kartika R. An expedient synthesis of functionalized 1,4-diketone-derived compounds via silyloxyallyl cation intermediates. Chem Commun (Camb) 2016; 52:2300-3. [DOI: 10.1039/c5cc09763k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Herein we describe the synthesis of highly functionalized 1,4-diketones that are readily differentiated as monosilylenol ethers via direct capture of silyloxyallyl cations by silyl enolates under Brønsted acid catalysis.
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Affiliation(s)
- Jacob R. Stepherson
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
| | - Frank R. Fronczek
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
| | - Rendy Kartika
- Department of Chemistry
- 232 Choppin Hall
- Louisiana State University
- Baton Rouge
- USA
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