1
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Li L, Hu L, Sae-Jew J, Rawal VH. Vinyltriarylbismuthonium Salts: Powerful Vehicles for α-Vinylation of Carbonyl Compounds. J Am Chem Soc 2024. [PMID: 38922228 DOI: 10.1021/jacs.4c05709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
α-Vinyl-carbonyl compounds are a class of orthogonally functionalized molecules, wherein the intrinsic C═O and C═C bonds can be used to unlock distinctly different reactivities. In this report, we present a simple method for the direct α-vinylation of carbonyl compounds utilizing vinyltriarylbismuthonium ("Vinyl-Bis") salts, which are stable and readily preparable on a decagram scale. This transformation is accomplished efficiently through the reaction of an in situ generated Li-enolate intermediate with a Vinyl-Bis reagent, leading to the formation of α-vinylated carbonyl compounds in good to excellent yields and with a remarkably broad substrate scope. Critically, this vinylation method is effective for enolates generated via numerous methods, enabling the sequencing of reactions that generate enolates with the vinylation step and the ready synthesis of diversely functionalized compounds, thereby underscoring the versatility and practicality of this method. Analogous reactions of discrete Li-enolates with other vinyl units and with aryl groups are also demonstrated.
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Affiliation(s)
- Li Li
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Lingbowei Hu
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Jirapon Sae-Jew
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Viresh H Rawal
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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2
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Teng BH, Bao ZP, Zhao Y, Wu XF. Nickel-Catalyzed Four-Component Carbonylation of 1,3-Butadiene To Access β,γ-Unsaturated Ketones. Org Lett 2024; 26:4779-4783. [PMID: 38807481 PMCID: PMC11165585 DOI: 10.1021/acs.orglett.4c01599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 05/13/2024] [Accepted: 05/16/2024] [Indexed: 05/30/2024]
Abstract
A new strategy to obtain β,γ-unsaturated ketones via the cross-coupling of 1,3-butadiene, alkyl bromides, and arylboronic acids under 1 bar of CO with nickel as the catalyst has been developed. This newly developed four-component carbonylation procedure features advantages including using a cheap catalytic system, high step economy, mild reaction conditions, and excellent 1,4-regioselectivity, thereby providing a sustainable and alternative tool for β,γ-unsaturated ketones production compared to the present tactics. To elucidate the application potential of this method, olefin synthons are derived from the representative coupling product.
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Affiliation(s)
- Bing-Hong Teng
- Dalian
National Laboratory for Clean Energy, Dalian Institute of Chemical
Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
- School
of Chemistry and Chemical Engineering, Liaoning
Normal University, 850 Huanghe Road, Dalian 116029, China
| | - Zhi-Peng Bao
- Dalian
National Laboratory for Clean Energy, Dalian Institute of Chemical
Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
- Leibniz-Institut
für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Yingying Zhao
- School
of Chemistry and Chemical Engineering, Liaoning
Normal University, 850 Huanghe Road, Dalian 116029, China
| | - Xiao-Feng Wu
- Dalian
National Laboratory for Clean Energy, Dalian Institute of Chemical
Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
- Leibniz-Institut
für Katalyse e.V., Albert-Einstein-Straße 29a, 18059 Rostock, Germany
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3
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Adhikari P, Hazarika N, Bhattacharyya K, Das A. Chromium-Catalyzed Cross-Coupling of Methyl Ketones with Cyclic Ketones toward the Selective Synthesis of β-Branched β,γ-Unsaturated Ketones. Org Lett 2024; 26:286-291. [PMID: 38165838 DOI: 10.1021/acs.orglett.3c03960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Chromium-catalyzed cross-coupling of methyl ketones with cyclic ketones to β-branched β,γ-unsaturated ketones are reported. Interestingly, single-crossed aldol condensation products are formed, even in reactions in which a mixture of products is possible. The reaction is highly chemoselective and regioselective. This catalytic route gives a unique opportunity to integrate the chemistry of the synthetic challenge cross-coupling reaction of ketones and the alkene migration reaction into a reaction pot.
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Affiliation(s)
- Priyanka Adhikari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | - Nitumoni Hazarika
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
| | | | - Animesh Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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4
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Adhikari P, Bhattacharyya D, Deori K, Sarmah BK, Das A. Chemo- and Regioselective Catalytic Cross-Coupling Reaction of Ketones for the Synthesis of β, γ-Disubstituted β, γ-Unsaturated Ketones. Chemistry 2023:e202303206. [PMID: 38140820 DOI: 10.1002/chem.202303206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 12/09/2023] [Accepted: 12/21/2023] [Indexed: 12/24/2023]
Abstract
C-C bond forming reaction of ketone with aldehyde is well-studied for the synthesis of α, β-unsaturated ketones, however, the reaction with two different ketones to unsaturated carbonyl compound has not yet been systematically studied. Probably due to the relatively low reactivity of ketones as electrophiles (aldol acceptors), its propensity for retro-aldol reaction. The reactions often suffer from unsatisfactory chemoselectivity (self- vs. crossed aldol products) and regioselectivity (thermodynamic vs. kinetic enolate). In this quest, we report here for the first time selective cross-coupling reaction of ketones to β-branched β, γ-unsaturated ketones by using ruthenium catalysis. Interestingly, single crossed aldol condensation products are formed even in reactions where a mixture of products is possible. Reaction is highly chemoselective, regioselective and produces H2 O as the only byproducts making the protocol environmentally benign. Method is compatible with a wide variety of sensitive functional group and applicable for even problematic aliphatic ketones as substrates. Notably, acetone was found as a three-carbon feedstock for the syntheses of simple β, γ-unsaturated ketone compounds. The process can further be extended to the gram-scale reaction and late-stage functionalization of natural products. With the help of DFT calculations, several control experiments, and deuterium-labeling experiments, the mechanistic finding demonstrated that initial aldol-condensation of ketones to a β, β-disubstituted α, β-unsaturated ketone, which further isomerizes to a β, γ- unsaturated ketone via η3 -allyl ruthenium complex.
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Affiliation(s)
- Priyanka Adhikari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Dipanjan Bhattacharyya
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Kritartha Deori
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Bikash Kumar Sarmah
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
- Department of Chemistry, Sonari College, Assam, India
| | - Animesh Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
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5
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Watanabe T, Oga K, Matoba H, Nagatomo M, Inoue M. Total Synthesis of Taxol Enabled by Intermolecular Radical Coupling and Pd-Catalyzed Cyclization. J Am Chem Soc 2023; 145:25894-25902. [PMID: 37972241 DOI: 10.1021/jacs.3c10658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Taxol (1) is a clinically used antineoplastic diterpenoid. The tetracyclic ring system comprises a 6/8/6-membered carbocycle (ABC-ring) and a fused oxetane ring (D-ring) embedded with a bridgehead double bond and decorated with multiple oxygen functionalities. Here, we report a convergent total synthesis of this exceedingly complex natural product. The C-ring fragment was designed to possess a bromocyclohexenone and an extra tetrahydrofuran ring to control the reactivity and selectivity, as well as to minimize functional group manipulations en route to 1. The α-alkoxyacyl telluride of the A-ring served as a radical precursor, and intermolecular radical coupling with the C-ring realized the installation of the C2- and C3-stereocenters and reductive removal of the bromide. After the C8-quaternary stereocenter was constructed by exploiting the three-dimensional shape of the intermediate, the C11-vinyl triflate of A-ring and the C8-methyl ketone of C-ring were utilized for Pd(0)-catalyzed cyclization of the central eight-membered B-ring with the bridgehead olefin. Adjustment of the oxidation level and attachment of the oxetane D-ring completed the total synthesis of 1 (28 steps, as the longest linear sequence). The fragment design principle and implementation of the powerful radical coupling reaction described in the present synthesis provide valuable information for planning and executing syntheses of diverse densely oxygenated terpenoids.
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Affiliation(s)
- Takahiro Watanabe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Kyohei Oga
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Hiroaki Matoba
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo113-0033, Japan
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6
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Zaman MK, Li R, Deng W. Photocatalytic Cross-Coupling of Tetrafluoropyridine Sulfides with Vinyl Halides for the Synthesis of β,γ-Unsaturated Carbonyl Compounds. J Org Chem 2023; 88:15761-15766. [PMID: 37890077 DOI: 10.1021/acs.joc.3c01800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2023]
Abstract
β,γ-Unsaturated carbonyl compounds serve as versatile building blocks in organic synthesis and medicinal chemistry. Herein we reported the synthesis of β,γ-unsaturated carbonyl compounds from tetrafluoropyridine sulfides with vinyl halides. This cross-coupling reaction takes the advantage of photocatalysis, as well as zinc catalysis, which is preferred due to its less-toxic, earth abundant, and cost-effective nature.
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Affiliation(s)
- Muhammad Kashif Zaman
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China
| | - Ruining Li
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, China
| | - Wei Deng
- Department of Oncology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China
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7
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Wang X, Yang R, Zhu B, Liu Y, Song H, Dong J, Wang Q. Direct allylic acylation via cross-coupling involving cooperative N‑heterocyclic carbene, hydrogen atom transfer, and photoredox catalysis. Nat Commun 2023; 14:2951. [PMID: 37221185 DOI: 10.1038/s41467-023-38743-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Accepted: 05/10/2023] [Indexed: 05/25/2023] Open
Abstract
Herein, we report a mild, operationally simple, multicatalytic method for the synthesis of β,γ-unsaturated ketones via allylic acylation of alkenes. Specifically, the method combines N‑heterocyclic carbene catalysis, hydrogen atom transfer catalysis, and photoredox catalysis for cross-coupling reactions between a wide range of feedstock carboxylic acids and readily available olefins to afford structurally diverse β,γ-unsaturated ketones without olefin transposition. The method could be used to install acyl groups on highly functionalized natural-product-derived compounds with no need for substrate pre-activation, and C-H functionalization proceed with excellent site selectivity. To demonstrate the potential applications of the method, we convert a representative coupling product into various useful olefin synthons.
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Affiliation(s)
- Xiaochen Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Rongxin Yang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Binbing Zhu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China.
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8
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Williams CG, Nistanaki SK, Wells CW, Nelson HM. α-Vinylation of Ester Equivalents via Main Group Catalysis for the Construction of Quaternary Centers. Org Lett 2023; 25:3591-3595. [PMID: 37192420 DOI: 10.1021/acs.orglett.3c00535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A methodology for the construction of sterically congested quaternary centers via the trapping of vinyl carbocations with silyl ketene acetals is disclosed. This main group-catalyzed α-vinylation reaction is advantageous as methods to access these congested motifs are limited. Moreover, β,γ-unsaturated carbonyl moieties and tetrasubstituted alkenes are present in various bioactive natural products and pharmaceuticals, and this catalytic platform offers a means of accessing them using simple and inexpensive materials.
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Affiliation(s)
- Chloe G Williams
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Sepand K Nistanaki
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Conner W Wells
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Hosea M Nelson
- Department of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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9
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Xie J, Zheng Z, Liu X, Zhang N, Choi S, He C, Dong G. Asymmetric Total Synthesis of (+)-Phainanoid A and Biological Evaluation of the Natural Product and Its Synthetic Analogues. J Am Chem Soc 2023; 145:4828-4852. [PMID: 36799470 DOI: 10.1021/jacs.2c13889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Here, we report our detailed efforts toward the synthesis of phainanoids, a novel class of dammarane-type triterpenoids with potent immunosuppressive activities and unique structural features. Systematic model studies have been carried out, and efficient approaches have been established to construct the benzofuranone-based 4,5-spirocycle, the D/E/F tricyclic core, the [4.3.1] propellane, and the 5,5-oxaspirolactone moieties. The asymmetric synthesis of (+)-phainanoid A has been achieved through kinetic resolution of the tricyclic core followed by diastereoselective installation of the A/B/C and G/H rings and fragment coupling with the enantioenriched I/J rings. In addition, novel estrone-derived phainanoid analogues have been prepared. The immunosuppressive and cell survival assays revealed that (+)-phainanoid A and some of its synthetic analogues can specifically inhibit stimulation-induced lymphocyte proliferation but not cell survival at their effective concentrations. Preliminary structure-activity relationship information has been obtained, which could inspire future design of immunosuppressive phainanoid analogues.
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Affiliation(s)
- Jiaxin Xie
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Zhong Zheng
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Xin Liu
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Nan Zhang
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Shinyoung Choi
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Chuan He
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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10
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Hui C, Wang Z, Xie Y, Liu J. Contemporary synthesis of bioactive cyclobutane natural products. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.04.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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11
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Pellissier H. Recent developments in enantioselective nickel( ii)-catalyzed conjugate additions. Org Chem Front 2022. [DOI: 10.1039/d2qo01047j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This review updates the field of enantioselective nickel-catalyzed conjugate additions since 2016.
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Affiliation(s)
- Hélène Pellissier
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France
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12
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Shi Y, Xu X, Chen X, Gao W, Zhang X. Synthesis of Cyclopentenes and Cyclohexenes Via Cobalt(II)-Catalyzed Oxidative Cyclization. J Org Chem 2021; 86:15335-15344. [PMID: 34708650 DOI: 10.1021/acs.joc.1c01900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A unique method for the synthesis of cyclopentenes and cyclohexenes has been achieved by the coupling of diketones and alkenes under cobalt(II) catalysis and dimethyl sulfoxide involvement. Under optimal conditions, the formation of five- and six-membered rings can be readily controlled by the α-position substitution of styrenes. This process is proposed to proceed through a reaction sequence of oxidative coupling (mediated by K2S2O8), regioselective alkene insertion (promoted by cobalt), and intramolecular attack of the resulting allylcobalt species on the carbonyl group or methyl group in the reactive methylene process.
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Affiliation(s)
- Yue Shi
- Engineering Technology Research Center of Henan Province for Solar Catalysis, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Xuefeng Xu
- Engineering Technology Research Center of Henan Province for Solar Catalysis, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Xinfeng Chen
- Engineering Technology Research Center of Henan Province for Solar Catalysis, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Wenchao Gao
- Engineering Technology Research Center of Henan Province for Solar Catalysis, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
| | - Xu Zhang
- Engineering Technology Research Center of Henan Province for Solar Catalysis, College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China
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13
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Morack T, Onneken C, Nakakohara H, Mück-Lichtenfeld C, Gilmour R. Enantiodivergent Prenylation via Deconjugative Isomerization. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03089] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Tobias Morack
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149 Münster, Germany
| | - Carina Onneken
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149 Münster, Germany
| | - Hiroshi Nakakohara
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149 Münster, Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149 Münster, Germany
| | - Ryan Gilmour
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149 Münster, Germany
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14
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Tao X, Yao K, Xue W. Ni-catalyzed cross-electrophile coupling of α-hydroxy carbonyl compound-derived oxalates with vinyl triflates. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Hu Z, Belitz F, Zhang G, Papp F, Gooßen LJ. Ru-Catalyzed ( E)-Specific ortho-C-H Alkenylation of Arenecarboxylic Acids by Coupling with Alkenyl Bromides. Org Lett 2021; 23:3541-3545. [PMID: 33885311 DOI: 10.1021/acs.orglett.1c00956] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the presence of [p-cymene)RuCl2]2, (E)-configured alkenyl bromides couple with aromatic carboxylates to form ortho-vinylbenzoic acids. This C-H vinylation proceeds in high yields without any activating phosphine ligands and has an excellent functional group tolerance. Starting from commonly available (E/Z )-mixtures of alkenyl bromides, (E)-configured vinyl arenes or dienes are formed exclusively. Mechanistic studies show that this selectivity is achieved because the (E)-configured alkenyl bromides undergo a smooth coupling, whereas the (Z)-isomers are rapidly eliminated with the formation of alkynes.
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Affiliation(s)
- Zhiyong Hu
- Evonik Chair of Organic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Florian Belitz
- Evonik Chair of Organic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Guodong Zhang
- Evonik Chair of Organic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Florian Papp
- Evonik Chair of Organic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Lukas J Gooßen
- Evonik Chair of Organic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
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16
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Quintavalla A, Veronesi R, Carboni D, Martinelli A, Zaccheroni N, Mummolo L, Lombardo M. Chemodivergent Photocatalytic Synthesis of Dihydrofurans and β,γ‐Unsaturated Ketones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100260] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Arianna Quintavalla
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Ruben Veronesi
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Davide Carboni
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Ada Martinelli
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Nelsi Zaccheroni
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Liviana Mummolo
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
| | - Marco Lombardo
- Alma Mater Studiorum – University of Bologna Department of Chemistry “G. Ciamician” Via Selmi 2 40126 Bologna Italy
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17
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Thomas WP, Pronin SV. New Methods and Strategies in the Synthesis of Terpenoid Natural Products. Acc Chem Res 2021; 54:1347-1359. [PMID: 33596652 PMCID: PMC10122273 DOI: 10.1021/acs.accounts.0c00809] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Indoloterpenoids of the paxilline type belong to a large family of secondary metabolites that exhibit unique molecular architectures and a diverse set of biological activities. More than 100 congeners identified to date share a common structural motif that contains an indole moiety fused to a rearranged diterpenoid fragment. The representative physiological and cellular effects attributed to this family of natural products include neurological and insecticidal activities, modulation of lipid balance, and inhibition of mitosis. The uniting polycyclic motif combined with the diversity of individual structural features of paxilline indoloterpenoids and the broad scope of their biological activities have fascinated organic chemists for the past four decades and have led to the development of numerous syntheses. In this Account, we describe our contributions to this field and how they in turn shape new directions that are developing in our laboratory.We begin with the discussion of our strategy for the synthesis of the shared indoloterpenoid core. To address stereochemical challenges encountered in earlier reports, we planned to leverage a suitably substituted cyclopentanone in a polycyclization to form the desired trans-decalin motif. This polycyclization relied on a radical-polar crossover cascade initiated by hydrogen atom transfer. The original process exhibited poor diastereoselectivity, but we discovered an efficient solution to this problem that took advantage of intramolecular tethering effects, culminating in short synthesis of emindole SB. During these studies, we also identified indium-mediated alkenylation of silyl enol ethers with alkynes as a suitable method for the synthesis of highly substituted β,γ-unsaturated ketones that was critical to achieving brevity of our route. We subsequently developed a catalytic version of this transformation that allowed for a formal bimolecular ene reaction that exhibited unusual and potentially useful selectivity in construction of quaternary centers.To test the scope and limitations of our approach to paxilline indoloterpenoids and identify potential improvements, we developed a synthesis of the more complex congener nodulisporic acid C. The convergent assembly of this natural product was enabled by identification of new elements of stereocontrol in the radical-polar crossover polycyclization en route to the polycyclic terpenoid motif and development of a highly diastereoselective enyne cycloisomerization to access the indenopyran motif and a ketone arylation protocol to unite the two complex fragments.In subsequent studies, we expanded the radical-polar crossover cascade underlying our approach to paxilline indoloterpenoids to a bimolecular setting, which allowed for annulation of two unsaturated carbonyl components to produce functionalized cyclohexanes. This transformation is particularly well suited for installation of fully substituted carbons and can be complementary to the venerable Diels-Alder reaction. The utility of the new annulation was tested in the synthesis of forskolin, allowing for rapid construction of the complex polycyclic motif in this densely functionalized labdane diterpenoid.Over the past five years, our initial forays into the synthesis of paxilline indoloterpenoids have grown into a program that incorporates development of new synthetic methods and pursues artificial assembly of terpenoid natural products from several different families. We are encouraged by the increasing diversity of structural motifs made accessible by application of this chemistry and continue to discover new aspects of the underlying reactivity.
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Affiliation(s)
- William P. Thomas
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
| | - Sergey V. Pronin
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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18
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Chen Z, So CM. Palladium‐Phenylpyrazolylphosphine‐Catalyzed Cross‐Coupling of Alkenyl Pivalates. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zicong Chen
- State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom, Kowloon Hong Kong
| | - Chau Ming So
- State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hung Hom, Kowloon Hong Kong
- The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen P. R. China
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19
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Zhang CS, Bao L, Chen KQ, Wang ZX, Chen XY. Photoinduced α-Alkenylation of Katritzky Salts: Synthesis of β,γ-Unsaturated Esters. Org Lett 2021; 23:1577-1581. [PMID: 33595328 DOI: 10.1021/acs.orglett.0c04287] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
β,γ-Unsaturated esters are building blocks in biologically important compounds, pharmaceuticals, and natural products. Because the current synthetic methods often require transition-metal catalysts or lack general variants, we herein describe a simple NaI-involved photoinduced deaminative alkenylation for their synthesis in the absence of photocatalysts and additives. The density functional theory study unveils that the electrostatic interaction of NaI with Katritzky salts is the key to forming the photoactive electron donor-acceptor complex, thus leading to the alkyl radicals for the alkenylation.
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Affiliation(s)
- Chao-Shen Zhang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lei Bao
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kun-Quan Chen
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Xiang Wang
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiang-Yu Chen
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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20
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Abstract
The development of novel synthetic methods remains a cornerstone in simplifying complex molecule synthesis. Progress in the field of transition metal catalysis has enabled new mechanistic strategies to achieve difficult chemical transformations, increased the value of abundant chemical building blocks, and pushed the boundaries of creative and strategic route design to improve step economy in multistep synthesis. Methodologies to introduce an olefin into saturated molecules continue to be essential transformations because of the plethora of reactions available for alkene functionalization. Of particular importance are dehydrogenation reactions adjacent to electron-withdrawing groups such as carbonyls, which advantageously provide activated olefins that can be regioselectively manipulated. Palladium catalysis occupies a central role in the most widely adopted carbonyl dehydrogenation reactions, but limits to the scope of these protocols persist.In this Account, we describe our group's contributions to the area of transition-metal-catalyzed dehydrogenation using palladium catalysis and more sustainable and economical nickel catalysis. These metals are used in conjunction with allyl and aryl halides or pseudohalides that serve as oxidants to access a unique mechanistic approach for one-step α,β-dehydrogenation of various electron-withdrawing groups, including ketones, esters, nitriles, amides, carboxylic acids, and electron-deficient heteroarenes. The pivotal reaction parameters that can be modified to influence reaction efficiency are highlighted, including base and oxidant structure as well as ligand and salt additive effects. This discussion is expected to serve as a guide for troubleshooting challenging dehydrogenation reactions and provide insight for future reaction development in this area.In addition to enabling dehydrogenation reactions, our group's allyl-Pd and -Ni chemistry can be used for C-C and C-X bond-forming reactions, providing novel disconnections with practical applications for expediting multistep synthesis. These transformations include a telescoped process for ketone α,β-vicinal difunctionalization; an oxidative enone β-functionalization, including β-stannylation, β-silylation, and β-alkylation; and an oxidative cycloalkenylation between unstabilized ketone enolates and unactivated alkenes. These bond-forming methodologies broaden the range of transformations accessible from abundant ketone, enone, and alkene moieties. Both the dehydrogenation and C-C and C-X bond-forming methodologies have been implemented in our group's total synthesis campaigns to provide step-efficient synthetic routes toward diverse natural products.Through the lens of multistep synthesis, the utility and robustness of our dehydrogenation and dehydrogenative functionalization methodologies can be better appreciated, and we hope that this Account will inspire practitioners to apply our methodologies to their own synthetic challenges.
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Affiliation(s)
- David Huang
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Timothy R Newhouse
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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21
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Zhang S, Duan X, Li P. Access to Stereodefined Multifunctionalized β,
γ‐Unsaturated
Ketones
via
Chemo‐, Regio‐ and Diastereoselective
Copper‐Catalyzed
Diborylation of
Cross‐Conjugated
Enynones
†. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000475] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Shuai Zhang
- Frontier Institute of Science and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710054 China
| | - Xinhua Duan
- School of Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
- Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - Pengfei Li
- Frontier Institute of Science and Technology, Xi'an Jiaotong University Xi'an Shaanxi 710054 China
- State Key Laboratory of Elemento‐Organic Chemistry, Nankai University Tianjin 300071 China
- Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
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22
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Chen Z, So CM. Pd-Catalyzed Cross-Coupling of Highly Sterically Congested Enol Carbamates with Grignard Reagents via C-O Bond Activation. Org Lett 2020; 22:3879-3883. [PMID: 32352793 DOI: 10.1021/acs.orglett.0c01127] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The palladium-catalyzed cross-coupling reaction of enol carbamates to construct highly sterically congested alkenyl compounds is presented for the first time. This protocol demonstrates the potential of using thermally stable and highly atom-economic enol electrophiles as building blocks in bulky alkene synthesis. This reaction accommodates a broad substrate scope with excellent Z/E isomer ratios, which also provides a new synthetic pathway for accessing Tamoxifen.
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Affiliation(s)
- Zicong Chen
- State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Chau Ming So
- State Key Laboratory of Chemical Biology and Drug Discovery and Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.,The Hong Kong Polytechnic University, Shenzhen Research Institute, Shenzhen, People's Republic of China
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23
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Li L, Wasik KA, Frost BJ, Geary LM. Silver catalyzed proto- and sila-Nakamura-type α-vinylation of silyl enol ethers with dichloroacetylene. Divergent formation of stereochemically pure tri- and tetrasubstituted olefins. Tetrahedron Lett 2020; 61. [PMID: 32863449 DOI: 10.1016/j.tetlet.2019.151370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The silver-catalyzed reaction of silyl enol ethers with dichloroacetylene (DCA) is described. When DCA was used as a solution in diethyl ether, we found that the silyl group was transferred to the vinyl group, resulting in stereochemically pure tetrasubstituted olefins. However, when DCA was used as a solution in the more polar acetonitrile, protonation was the major pathway, and trisubstituted olefins were the dominant products.
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Affiliation(s)
- Lun Li
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada, 89557, USA
| | - Kimberly A Wasik
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada, 89557, USA
| | - Brian J Frost
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada, 89557, USA
| | - Laina M Geary
- University of Nevada, Reno, Department of Chemistry, Reno, Nevada, 89557, USA
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24
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Bertho S, Dondasse I, Retailleau P, Nicolas C, Gillaizeau I. β-C(sp2)–H alkylation of enamides using xanthate chemistry. NEW J CHEM 2020. [DOI: 10.1039/d0nj01209b] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Access to the γ-amino-β,γ-unsaturated acyl scaffold was established by applying xanthate chemistry to enamides.
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Affiliation(s)
- Sylvain Bertho
- Institute of Organic and Analytical Chemistry
- ICOA UMR 7311 CNRS
- Université d’Orléans
- 45100 Orléans
- France
| | - Ismaël Dondasse
- Institute of Organic and Analytical Chemistry
- ICOA UMR 7311 CNRS
- Université d’Orléans
- 45100 Orléans
- France
| | - Pascal Retailleau
- Institut de Chimie des Substances Naturelles
- CNRS
- 91198 Gif-sur-Yvette Cedex
- France
| | - Cyril Nicolas
- Institute of Organic and Analytical Chemistry
- ICOA UMR 7311 CNRS
- Université d’Orléans
- 45100 Orléans
- France
| | - Isabelle Gillaizeau
- Institute of Organic and Analytical Chemistry
- ICOA UMR 7311 CNRS
- Université d’Orléans
- 45100 Orléans
- France
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25
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Pham PH, Nguyen KX, Pham HTB, Nguyen TT, Phan NTS. Homo- and Heteroannulation of sp3 C–H Bonds in Acetophenones for Divergent Synthesis of Thienothiazoles. Org Lett 2019; 21:8795-8799. [DOI: 10.1021/acs.orglett.9b03414] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Phuc H. Pham
- Faculty of Chemical Engineering, HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
| | - Khang X. Nguyen
- Faculty of Chemical Engineering, HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
| | - Hoai T. B. Pham
- Faculty of Chemical Engineering, HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
- Department of Chemistry, University of Colorado Denver, Denver, Colorado 80204, United States
| | - Tung T. Nguyen
- Faculty of Chemical Engineering, HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
| | - Nam T. S. Phan
- Faculty of Chemical Engineering, HCMC University of Technology, VNU-HCM, 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam
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26
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Chen J, Guo P, Zhang J, Rong J, Sun W, Jiang Y, Loh T. Synthesis of Functionalized α‐Vinyl Aldehydes from Enaminones. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Jie Chen
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Pan Guo
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Jianguo Zhang
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Jiaxin Rong
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Wangbin Sun
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Yaojia Jiang
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Teck‐Peng Loh
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Singapore 637616 Singapore
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27
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Chen J, Guo P, Zhang J, Rong J, Sun W, Jiang Y, Loh T. Synthesis of Functionalized α‐Vinyl Aldehydes from Enaminones. Angew Chem Int Ed Engl 2019; 58:12674-12679. [DOI: 10.1002/anie.201906213] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Jie Chen
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Pan Guo
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Jianguo Zhang
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Jiaxin Rong
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Wangbin Sun
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Yaojia Jiang
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Teck‐Peng Loh
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
- Division of Chemistry and Biological ChemistrySchool of Physical and Mathematical SciencesNanyang Technological University Singapore 637616 Singapore
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28
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Turlik A, Chen Y, Scruse AC, Newhouse TR. Convergent Total Synthesis of Principinol D, a Rearranged Kaurane Diterpenoid. J Am Chem Soc 2019; 141:8088-8092. [PMID: 31042866 PMCID: PMC7192013 DOI: 10.1021/jacs.9b03751] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The total synthesis of principinol D, a rearranged kaurane diterpenoid, is reported. This grayanane natural product is constructed via a convergent fragment coupling approach, wherein the central seven-membered ring is synthesized at a late stage. The bicyclo[3.2.1]octane fragment is accessed by a Ni-catalyzed α-vinylation reaction. Strategic reductions include a diastereoselective SmI2-mediated ketone reduction with PhSH and a new protocol for selective ester reduction in the presence of ketones. The convergent strategy reported herein may be an entry point to the larger class of kaurane diterpenoids.
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Affiliation(s)
- Aneta Turlik
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Yifeng Chen
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Anthony C. Scruse
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Timothy R. Newhouse
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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29
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Huang D, Szewczyk SM, Zhang P, Newhouse TR. Allyl-Nickel Catalysis Enables Carbonyl Dehydrogenation and Oxidative Cycloalkenylation of Ketones. J Am Chem Soc 2019; 141:5669-5674. [PMID: 30861346 PMCID: PMC7495923 DOI: 10.1021/jacs.9b02552] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We herein disclose the first report of a first-row transition metal-catalyzed α,β-dehydrogenation of carbonyl compounds using allyl-nickel catalysis. This development overcomes several limitations of previously reported allyl-palladium-catalyzed oxidation, and is further leveraged for the development of an oxidative cycloalkenylation reaction that provides access to bicycloalkenones with fused, bridged, and spirocyclic ring systems using unactivated ketone and alkene precursors.
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Affiliation(s)
- David Huang
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Suzanne M. Szewczyk
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Pengpeng Zhang
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Timothy R. Newhouse
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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30
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Zaid Y, Mboyi CD, Drapeau MP, Radal L, Chahdi FO, Rodi YK, Ollevier T, Taillefer M. Transition-Metal-Free α-Vinylation of Enolizable Ketones with β-Bromostyrenes. Org Lett 2019; 21:1564-1568. [PMID: 30801194 DOI: 10.1021/acs.orglett.8b04004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An α-vinylation of enolizable ketones has been developed by using β-bromostyrenes and a KO tBu/NMP system. β,γ-Unsaturated ketones of E configuration were obtained in excellent yield and selectivity. Further synthetic possibilities are highlighted by one-pot functionalization via trapping of intermediate dienolates with alkyl, allyl, benzyl, and propargyl halides to generate quaternary centers. The reported transformation is believed to involve phenylacetylene and propargylic alcohol derivatives.
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Affiliation(s)
- Yassir Zaid
- Laboratoire de Chimie Organique Appliquée , FST Fès BP 2202 , 30000 Fès , Morocco.,CNRS, UMR 5253, AM2N , Institut Charles Gerhardt Montpellier ENSCM , 8 rue de l'École Normale , F-34296 Montpellier Cedex 5 , France
| | - Clève Dionel Mboyi
- CNRS, UMR 5253, AM2N , Institut Charles Gerhardt Montpellier ENSCM , 8 rue de l'École Normale , F-34296 Montpellier Cedex 5 , France
| | - Martin Pichette Drapeau
- Département de chimie , Université Laval , 1045 avenue de la Médecine , Québec (Québec), G1V 0A6 , Canada.,CNRS, UMR 5253, AM2N , Institut Charles Gerhardt Montpellier ENSCM , 8 rue de l'École Normale , F-34296 Montpellier Cedex 5 , France
| | - Léa Radal
- Département de chimie , Université Laval , 1045 avenue de la Médecine , Québec (Québec), G1V 0A6 , Canada
| | | | - Youssef Kandri Rodi
- Laboratoire de Chimie Organique Appliquée , FST Fès BP 2202 , 30000 Fès , Morocco
| | - Thierry Ollevier
- Département de chimie , Université Laval , 1045 avenue de la Médecine , Québec (Québec), G1V 0A6 , Canada
| | - Marc Taillefer
- CNRS, UMR 5253, AM2N , Institut Charles Gerhardt Montpellier ENSCM , 8 rue de l'École Normale , F-34296 Montpellier Cedex 5 , France
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31
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Vargová D, Némethová I, Plevová K, Šebesta R. Asymmetric Transition-Metal Catalysis in the Formation and Functionalization of Metal Enolates. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04357] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Denisa Vargová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Ivana Némethová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Kristína Plevová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Radovan Šebesta
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
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32
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Plaza M, Paraja M, Florentino L, Valdés C. Domino Synthesis of Benzo-Fused β,γ-Unsaturated Ketones from Alkenylboronic Acids and N-Tosylhydrazone-Tethered Benzonitriles. Org Lett 2019; 21:632-635. [DOI: 10.1021/acs.orglett.8b03705] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Manuel Plaza
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33006, Spain
| | - Miguel Paraja
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33006, Spain
| | - Lucía Florentino
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33006, Spain
| | - Carlos Valdés
- Departamento de Química Orgánica e Inorgánica and Instituto Universitario de Química Organometálica “Enrique Moles”, Universidad de Oviedo, c/Julián Clavería 8, Oviedo 33006, Spain
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33
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Matoba H, Watanabe T, Nagatomo M, Inoue M. Convergent Synthesis of Taxol Skeleton via Decarbonylative Radical Coupling Reaction. Org Lett 2018; 20:7554-7557. [PMID: 30452272 DOI: 10.1021/acs.orglett.8b03302] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The highly oxygenated 6/8/6-membered ABC-ring 2 of taxol was assembled in a convergent fashion. A decarbonylative radical reaction between α-alkoxyacyl telluride 4 and cyanocyclohexenone 5 linked the A- and C-rings and stereoselectively installed the C2- and C3-tertiary carbon centers of 3. After the C8-quaternary stereocenter was constructed, the C9-methyl ketone and the C11-vinyl triflate of 30 participated in Pd(0)-promoted cyclization of the eight-membered B-ring, giving rise to the taxol skeleton 2.
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Affiliation(s)
- Hiroaki Matoba
- Graduate School of Pharmaceutical Science , The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan
| | - Takahiro Watanabe
- Graduate School of Pharmaceutical Science , The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan
| | - Masanori Nagatomo
- Graduate School of Pharmaceutical Science , The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Science , The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-0033 , Japan
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34
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DFT-assisted design and evaluation of bifunctional copper(I) catalysts for the direct intermolecular addition of aldehydes and ketones to alkynes. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.07.034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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35
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Liu C, Wang Q. Alkenylation of C(sp
3
)−H Bonds by Zincation/Copper‐Catalyzed Cross‐Coupling with Iodonium Salts. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201713278] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Chuan Liu
- French Family Science Center Department of Chemistry Duke University 124 Science Drive Durham NC 27708 USA
- Current address: HitGen Ltd. Tianfu Life Science Park 88 South Keyuan Road Chengdu 610041 P. R. China
| | - Qiu Wang
- French Family Science Center Department of Chemistry Duke University 124 Science Drive Durham NC 27708 USA
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36
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Liu C, Wang Q. Alkenylation of C(sp 3 )-H Bonds by Zincation/Copper-Catalyzed Cross-Coupling with Iodonium Salts. Angew Chem Int Ed Engl 2018; 57:4727-4731. [PMID: 29479782 DOI: 10.1002/anie.201713278] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2017] [Revised: 02/06/2018] [Indexed: 12/20/2022]
Abstract
α-Vinylation of phosphonates, phosphine oxides, sulfones, sulfonamides, and sulfoxides has been achieved by selective C-H zincation and copper-catalyzed C(sp3 )-C(sp2 ) cross-coupling reaction using vinylphenyliodonium salts. The vinylation transformation proceeds in high efficiency and stereospecificity under mild reaction conditions. This zincative cross-coupling reaction represents a general alkenylation strategy, which is also applicable for α-alkenylation of esters, amides, and nitriles in the synthesis of β,γ-unsaturated carbonyl compounds.
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Affiliation(s)
- Chuan Liu
- French Family Science Center, Department of Chemistry, Duke University, 124 Science Drive, Durham, NC, 27708, USA.,Current address: HitGen Ltd., Tianfu Life Science Park, 88 South Keyuan Road, Chengdu, 610041, P. R. China
| | - Qiu Wang
- French Family Science Center, Department of Chemistry, Duke University, 124 Science Drive, Durham, NC, 27708, USA
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37
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Chen W, Li Y, Chen Y, Ho CY. (NHC)NiH-Catalyzed Regiodivergent Cross-Hydroalkenylation of Vinyl Ethers with α-Olefins: Syntheses of 1,2- and 1,3-Disubstituted Allyl Ethers. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712693] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Weihao Chen
- Department of Chemistry; Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG); Southern University of Science and Technology (SUSTech); China
| | - Yang Li
- Department of Chemistry; Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG); Southern University of Science and Technology (SUSTech); China
| | - Yang Chen
- Department of Chemistry; Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG); Southern University of Science and Technology (SUSTech); China
| | - Chun-Yu Ho
- Department of Chemistry; Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG); Southern University of Science and Technology (SUSTech); China
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38
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Chen W, Li Y, Chen Y, Ho CY. (NHC)NiH-Catalyzed Regiodivergent Cross-Hydroalkenylation of Vinyl Ethers with α-Olefins: Syntheses of 1,2- and 1,3-Disubstituted Allyl Ethers. Angew Chem Int Ed Engl 2018; 57:2677-2681. [PMID: 29359380 DOI: 10.1002/anie.201712693] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Indexed: 01/11/2023]
Abstract
Cross-hydroalkenylation of a vinyl ether (1) with an α-olefin (2) was first achieved by a set of [NHC-Ni(allyl)]BArF (NHC=N-heterocyclic carbene) catalysts. Both 1,2- and 1,3-disubstituted allyl ethers were obtained, highly selectively, by using NHCs of different sizes. In contrast, the chemoselectivity (i.e., 1 as acceptor and 2 as donor) was controlled mostly by electronic effects through the catalyst-substrate interaction. Sterically bulkier alkenes (2) were used as preferred donors compared to smaller alkenes. This electronic effect also served as a basis for the first tail-to-head cross-hydroalkenylations of 1 with either a vinyl silane or boronic ester.
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Affiliation(s)
- Weihao Chen
- Department of Chemistry, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology (SUSTech), China
| | - Yang Li
- Department of Chemistry, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology (SUSTech), China
| | - Yang Chen
- Department of Chemistry, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology (SUSTech), China
| | - Chun-Yu Ho
- Department of Chemistry, Shenzhen Key Laboratory of Full Spectral Solar Electricity Generation (FSSEG), Southern University of Science and Technology (SUSTech), China
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39
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Zhang X, Tutkowski B, Oliver A, Helquist P, Wiest O. Mechanistic Study of the Nickel-Catalyzed α,β-Coupling of Saturated Ketones. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04105] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xin Zhang
- Laboratory
of Computational Chemistry and Drug Design, Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, People’s Republic of China
| | - Brandon Tutkowski
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Allen Oliver
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Paul Helquist
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Olaf Wiest
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
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40
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Xie J, Wang J, Dong G. Synthetic Study of Phainanoids. Highly Diastereoselective Construction of the 4,5-Spirocycle via Palladium-Catalyzed Intramolecular Alkenylation. Org Lett 2017; 19:3017-3020. [DOI: 10.1021/acs.orglett.7b01303] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jiaxin Xie
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Jianchun Wang
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, United States
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41
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Transition-metal-free chemo- and regioselective vinylation of azaallyls. Nat Chem 2017; 9:997-1004. [PMID: 28937664 DOI: 10.1038/nchem.2760] [Citation(s) in RCA: 79] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Accepted: 03/01/2017] [Indexed: 11/08/2022]
Abstract
Direct C(sp3)-C(sp2) bond formation under transition-metal-free conditions offers an atom-economical, inexpensive and environmentally benign alternative to traditional transition-metal-catalysed cross-coupling reactions. A new chemo- and regioselective coupling protocol between 3-aryl-substituted-1,1-diphenyl-2-azaallyl derivatives and vinyl bromides has been developed. This is the first transition-metal-free cross-coupling of azaallyls with vinyl bromide electrophiles and delivers allylic amines in excellent yields (up to 99%). This relatively simple and mild protocol offers a direct and practical strategy for the synthesis of high-value allylic amine building blocks that does not require the use of transition metals, special initiators or photoredox catalysts. Radical clock experiments, electron paramagnetic resonance studies and density functional theory calculations point to an unprecedented substrate-dependent coupling mechanism. Furthermore, an electron paramagnetic resonance signal was observed when the N-benzyl benzophenone ketimine was subjected to silylamide base, supporting the formation of radical species upon deprotonation. The unique mechanisms outlined herein could pave the way for new approaches to transition-metal-free C-C bond formations.
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42
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Li XY, Yuan WQ, Tang S, Huang YW, Xue JH, Fu L, Guo QX. Chiral Calcium Phosphate Catalyzed Asymmetric Alkenylation Reaction of Arylglyoxals with 3-Vinylindoles. Org Lett 2017; 19:1120-1123. [DOI: 10.1021/acs.orglett.7b00143] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiao-Yun Li
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Wen-Qiang Yuan
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Sheng Tang
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Yi-Wei Huang
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Jia-Hui Xue
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Li−Na Fu
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
| | - Qi-Xiang Guo
- Key Laboratory of Applied
Chemistry of Chongqing Municipality, School of Chemistry and Chemical
Engineering, Southwest University, Chongqing 400715, China
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43
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McLarney BD, Cavitt MA, Donnell TM, Musaev DG, France S. Rh II -Catalyzed β-C(sp 2 )-H Alkylation of Enol Ethers, Enamides and Enecarbamates with α-Diazo Dicarbonyl Compounds. Chemistry 2017; 23:1129-1135. [PMID: 27966244 DOI: 10.1002/chem.201604518] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Indexed: 12/29/2022]
Abstract
A RhII -catalyzed method for intermolecular alkylation of the β-C(sp2 )-H bond of enol ethers, enamides, and enecarbamates with α-diazo-1,3-dicarbonyl compounds is reported. The products are formed in up to 99 % yield and can be readily derivatized under a variety of conditions. By utilizing a combination of experimental and computational studies, the presumptive addition-elimination reaction mechanism was investigated and found to proceed under thermodynamic control at higher temperature. The acquired fundamental knowledge was translated into a strategic reaction design and yielded the first example of the β-C-H functionalizations of acyclic enol ethers using α-diazo-1,3-dicarbonyl compounds.
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Affiliation(s)
- Brett D McLarney
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
| | - Marchello A Cavitt
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
| | - Theodore M Donnell
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
| | - Djamaladdin G Musaev
- Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia, 30322, USA
| | - Stefan France
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA.,Petit Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, 30332, USA
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44
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Wu Y, Fu WC, Chiang CW, Choy PY, Kwong FY, Lei A. Palladium-catalysed mono-α-alkenylation of ketones with alkenyl tosylates. Chem Commun (Camb) 2017; 53:952-955. [DOI: 10.1039/c6cc08392g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first general Pd-catalysed mono-α-alkenylation of ketones using alkenyl tosylates is reported. The combination of Pd(dba)2 and XPhos as the catalytic system exhibited excellent chemo- and monoselectivity at a relatively low catalyst loading (0.1–1.0 mol%).
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Affiliation(s)
- Yong Wu
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies (IAS)
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Wai Chung Fu
- State Key Laboratory of Chirosciences and Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Hung Hom
- Kowloon
- China
| | - Chien-Wei Chiang
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies (IAS)
- Wuhan University
- Wuhan 430072
- P. R. China
| | - Pui Ying Choy
- State Key Laboratory of Chirosciences and Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Hung Hom
- Kowloon
- China
| | - Fuk Yee Kwong
- State Key Laboratory of Chirosciences and Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Hung Hom
- Kowloon
- China
| | - Aiwen Lei
- College of Chemistry and Molecular Sciences
- The Institute for Advanced Studies (IAS)
- Wuhan University
- Wuhan 430072
- P. R. China
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45
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Johnson T, Pultar F, Menke F, Lautens M. Palladium-Catalyzed α-Arylation of Vinylogous Esters for the Synthesis of γ,γ-Disubstituted Cyclohexenones. Org Lett 2016; 18:6488-6491. [DOI: 10.1021/acs.orglett.6b03394] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Johnson
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Felix Pultar
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Friedericke Menke
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Mark Lautens
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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46
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Grigalunas M, Wiest O, Helquist P. Single-Flask Multicomponent Synthesis of Highly Substituted α-Pyrones via a Sequential Enolate Arylation and Alkenylation Strategy. Org Lett 2016; 18:5724-5727. [PMID: 27768319 DOI: 10.1021/acs.orglett.6b02969] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Trisubstituted α-pyrones are obtained by a Pd-catalyzed three-component, single-flask operation via an α-arylation, subsequent α-alkenylation, alkene isomerization, and dienolate lactonization. A variety of coupling components under mild conditions afforded isolated yields of up to 93% of the pyrones with complete control of regioselectivity. Metal dependence was noted for three of the steps of the pathway. Utility of the pyrone products was demonstrated by further transformations providing convenient access to polyaromatic compounds, exhibiting broad molecular diversity.
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Affiliation(s)
- Michael Grigalunas
- Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46566, United States
| | - Olaf Wiest
- Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46566, United States.,Lab of Computational Chemistry and Drug Design, School of Chemical Biology and Biotechnology, Peking University, Shenzhen Graduate School , Shenzhen 518055, China
| | - Paul Helquist
- Department of Chemistry and Biochemistry, University of Notre Dame , Notre Dame, Indiana 46566, United States
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47
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48
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Holmbo SD, Godfrey NA, Hirner JJ, Pronin SV. A Catalytic Intermolecular Formal Ene Reaction between Ketone-Derived Silyl Enol Ethers and Alkynes. J Am Chem Soc 2016; 138:12316-9. [PMID: 27626462 DOI: 10.1021/jacs.6b06847] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A catalytic formal ene reaction between ketone-derived silyl enol ethers and terminal alkynes is described. This transformation is uniquely capable of bimolecular assembly of 2-siloxy-1,4-dienes and can be used to access β,γ-unsaturated ketones containing quaternary carbons in the α-position.
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Affiliation(s)
- Stephen D Holmbo
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
| | - Nicole A Godfrey
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
| | - Joshua J Hirner
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
| | - Sergey V Pronin
- Department of Chemistry, University of California , Irvine, California 92697-2025, United States
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49
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Chen P, Meng Y, Wang H, Han F, Wang Y, Song C, Chang J. Synthesis of 2-Cyclopentenone Derivatives via Palladium-Catalyzed Intramolecular Carbonyl α-Alkenylation. Org Lett 2016; 18:3914-7. [DOI: 10.1021/acs.orglett.6b01955] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Panpan Chen
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Yinggao Meng
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Han Wang
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Feipeng Han
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Yulong Wang
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Chuanjun Song
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
| | - Junbiao Chang
- College of Chemistry and
Molecular Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
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50
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Yang X, Kim BS, Li M, Walsh PJ. Palladium-Catalyzed Selective α-Alkenylation of Pyridylmethyl Ethers with Vinyl Bromides. Org Lett 2016; 18:2371-4. [PMID: 27160421 DOI: 10.1021/acs.orglett.6b00815] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient palladium-catalyzed α-alkenylation of pyridylmethyl ethers with vinyl bromides is presented. A Pd/NIXANTPHOS-based catalyst system enables a mild and chemoselective coupling between a variety of pyridylmethyl ethers and vinyl bromides in good to excellent yields. Under the mild conditions, β,γ-unsaturated products are obtained without isomerization or Heck byproducts observed.
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Affiliation(s)
- Xiaodong Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University , Kunming, 650091, P. R. China.,Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Byeong-Seon Kim
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Minyan Li
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
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