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Berger M, Carboni D, Melchiorre P. Photochemical Organocatalytic Regio- and Enantioselective Conjugate Addition of Allyl Groups to Enals. Angew Chem Int Ed Engl 2021; 60:26373-26377. [PMID: 34695283 PMCID: PMC9298816 DOI: 10.1002/anie.202111648] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 10/18/2021] [Indexed: 11/18/2022]
Abstract
We report the first catalytic enantioselective conjugate addition of allyl groups to α,β‐unsaturated aldehydes. The chemistry exploits the visible‐light‐excitation of chiral iminium ions to activate allyl silanes towards the formation of allylic radicals, which are then intercepted stereoselectively. The underlying radical mechanism of this process overcomes the poor regio‐ and chemoselectivity that traditionally affects the conjugate allylation of enals proceeding via polar pathways. We also demonstrate how this organocatalytic strategy could selectively install a valuable prenyl fragment at the β‐carbon of enals.
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Affiliation(s)
- Martin Berger
- ICIQ-Institute of Chemical Research of Catalonia, the Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona, Spain
| | - Davide Carboni
- ICIQ-Institute of Chemical Research of Catalonia, the Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona, Spain
| | - Paolo Melchiorre
- ICREA-Passeig Lluís Companys 23, 08010, Barcelona, Spain.,ICIQ-Institute of Chemical Research of Catalonia, the Barcelona Institute of Science and Technology, Avenida Països Catalans 16, 43007, Tarragona, Spain
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2
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Berger M, Carboni D, Melchiorre P. Photochemical Organocatalytic Regio‐ and Enantioselective Conjugate Addition of Allyl Groups to Enals. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111648] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Martin Berger
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
| | - Davide Carboni
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
| | - Paolo Melchiorre
- ICREA—Passeig Lluís Companys 23 08010 Barcelona Spain
- ICIQ—Institute of Chemical Research of Catalonia the Barcelona Institute of Science and Technology Avenida Països Catalans 16 43007 Tarragona Spain
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3
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Lin X, Liu Y, Li C. Allylsilane Reagent-Controlled Divergent Asymmetric Catalytic Reactions of 2-Naphthoquinone-1-methide. Chemistry 2020; 26:14173-14180. [PMID: 32815199 DOI: 10.1002/chem.202002814] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/29/2020] [Indexed: 12/26/2022]
Abstract
Herein, the first allylsilane reagent-controlled divergent asymmetric Hosomi-Sakurai conjugate allylation and hetero-Diels-Alder (HDA) with 2-naphthoquinone-1-methide (2-Nap-Q-1-M) under the catalysis of ScIII /Feng ligand complex is reported. With these methods, a variety of uniquely substituted chiral allyl-functionalized diaryl compounds and naphthopyran products were obtained in a straightforward and highly stereoselective (up to 96.5:3.5 e.r.) manner under mild conditions. Moreover, it is demonstrated that 2-Nap-Q-1-M can serve as an efficient diene for a side asymmetric Diels-Alder (D-A) reaction. This principle can provide a straightforward access to hydrophenalene in an optically active form, which represents a structural core of various natural products and bioactive molecules.
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Affiliation(s)
- Xiangfeng Lin
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100039, P. R. China
| | - Yan Liu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China
| | - Can Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China
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4
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Tang Q, Fu K, Ruan P, Dong S, Su Z, Liu X, Feng X. Asymmetric Catalytic Formal 1,4‐Allylation of β,γ‐Unsaturated α‐Ketoesters: Allylboration/Oxy‐Cope Rearrangement. Angew Chem Int Ed Engl 2019; 58:11846-11851. [DOI: 10.1002/anie.201905533] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 06/07/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Qiong Tang
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Kai Fu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Peiran Ruan
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Zhishan Su
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
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5
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Tang Q, Fu K, Ruan P, Dong S, Su Z, Liu X, Feng X. Asymmetric Catalytic Formal 1,4‐Allylation of β,γ‐Unsaturated α‐Ketoesters: Allylboration/Oxy‐Cope Rearrangement. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905533] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Qiong Tang
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Kai Fu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Peiran Ruan
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Zhishan Su
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China
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6
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Huang Y, Torker S, Li X, del Pozo J, Hoveyda AH. Racemic Vinylallenes in Catalytic Enantioselective Multicomponent Processes: Rapid Generation of Complexity through 1,6‐Conjugate Additions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201812535] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Youming Huang
- Department of ChemistryMerkert Chemistry CenterBoston College Chestnut Hill MA 02467 USA
| | - Sebastian Torker
- Department of ChemistryMerkert Chemistry CenterBoston College Chestnut Hill MA 02467 USA
| | - Xinghan Li
- Department of ChemistryMerkert Chemistry CenterBoston College Chestnut Hill MA 02467 USA
| | - Juan del Pozo
- Department of ChemistryMerkert Chemistry CenterBoston College Chestnut Hill MA 02467 USA
| | - Amir H. Hoveyda
- Department of ChemistryMerkert Chemistry CenterBoston College Chestnut Hill MA 02467 USA
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7
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Huang Y, Torker S, Li X, Del Pozo J, Hoveyda AH. Racemic Vinylallenes in Catalytic Enantioselective Multicomponent Processes: Rapid Generation of Complexity through 1,6-Conjugate Additions. Angew Chem Int Ed Engl 2019; 58:2685-2691. [PMID: 30653802 DOI: 10.1002/anie.201812535] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/31/2018] [Indexed: 01/22/2023]
Abstract
Racemic vinylallenes are shown to be effective substrates for catalytic multicomponent diastereo- and enantioselective 1,6-conjugate addition of multifunctional allyl moieties to easily accessible α,β,γ,δ-unsaturated diesters. Reactions may be catalyzed by 5.0 mol % of a readily accessible NHC-Cu complex at ambient temperature, and other than a vinylallene, involve B2 (pin)2 and an α,β,γ,δ-unsaturated diester. A variety of vinylallenes were converted to products bearing a Z-trisubstituted alkenyl-B(pin) moiety, a vinyl group, a β,γ-unsaturated diester unit, and vicinal stereogenic centers in up to 67 % yield, 87:13 Z/E ratio, >98:2 d.r., and 98:2 e.r. Chemoselective modifications involving the alkenyl-B(pin), the vinyl, or the 1,2-disubstituted olefin moieties were carried out to demonstrate versatility and utility. Stereochemical models, based on mechanistic and DFT studies, demonstrate the dynamic behavior of intermediated Cu-allyl species and account for various selectivity profiles.
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Affiliation(s)
- Youming Huang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Sebastian Torker
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Xinghan Li
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Juan Del Pozo
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
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Misaki T, Tatsumi T, Okamoto T, Hayashi Y, Jin N, Sugimura T. Stereoconvergent 1,4-Addition Reaction of 5H-Oxazol-4-ones with E,Z Isomeric Mixture of Alkylidene β-Ketoesters Catalyzed by Chiral Guanidines. Chemistry 2018; 24:9778-9782. [PMID: 29741785 DOI: 10.1002/chem.201802271] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Indexed: 12/13/2022]
Abstract
A 1,4-addition reaction of 5H-oxazol-4-ones to alkylidene β-ketoesters, which was catalyzed by using chiral guanidines via a dynamic kinetic resolution process that involved geometric isomerization of the alkylidene β-ketoesters, was developed. This method allowed using E,Z isomeric mixture of various acyclic alkylidene β-ketoesters to obtain the products stereoselectively. The relation between the geometry and the stereoselectivity of products was investigated, and the derivatization of the products to the corresponding α-acyl-γ-lactone was performed.
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Affiliation(s)
- Tomonori Misaki
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
| | - Toshifumi Tatsumi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
| | - Tatsumasa Okamoto
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
| | - Yusuke Hayashi
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
| | - Nari Jin
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
| | - Takashi Sugimura
- Graduate School of Material Science, University of Hyogo, 3-2-1 Kohto, Kamigori, Hyogo, 678-1297, Japan
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Berkes B, Ozsváth K, Molnár L, Gáti T, Holczbauer T, Kardos G, Soós T. Expedient and Diastereodivergent Assembly of Terpenoid Decalin Subunits having Quaternary Stereocenters through Organocatalytic Robinson Annulation of Nazarov Reagent. Chemistry 2016; 22:18101-18106. [DOI: 10.1002/chem.201604541] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Barbara Berkes
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Kristóf Ozsváth
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Laura Molnár
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tamás Gáti
- Servier Research Institute of Medicinal Chemistry; Záhony Street 7 1031 Budapest Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - György Kardos
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tibor Soós
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
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10
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Li X, Meng F, Torker S, Shi Y, Hoveyda AH. Catalytic Enantioselective Conjugate Additions of (pin)B-Substituted Allylcopper Compounds Generated in situ from Butadiene or Isoprene. Angew Chem Int Ed Engl 2016; 55:9997-10002. [PMID: 27436785 DOI: 10.1002/anie.201605001] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Indexed: 02/03/2023]
Abstract
Multicomponent catalytic enantioselective transformations that entail the combination of butadiene or isoprene (common feedstock), an enoate (prepared in one step) and B2 (pin)2 (commercially available) are presented. These processes constitute an uncommon instance of conjugate addition of an allyl moiety and afford the desired products in up to 83 % yield and 98:2 enantiomeric ratio. Based on DFT calculations stereochemical models and rationale for the observed profiles in selectivity are provided.
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Affiliation(s)
- Xiben Li
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Fanke Meng
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Sebastian Torker
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Ying Shi
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA, 02467, USA.
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11
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Li X, Meng F, Torker S, Shi Y, Hoveyda AH. Catalytic Enantioselective Conjugate Additions of (pin)B‐Substituted Allylcopper Compounds Generated in situ from Butadiene or Isoprene. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xiben Li
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Fanke Meng
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Sebastian Torker
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Ying Shi
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
| | - Amir H. Hoveyda
- Department of Chemistry Merkert Chemistry Center Boston College Chestnut Hill MA 02467 USA
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12
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Huang Y, Ma C, Lee YX, Huang RZ, Zhao Y. Cobalt-Catalyzed Allylation of Heterobicyclic Alkenes: Ligand-Induced Divergent Reactivities. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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13
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Huang Y, Ma C, Lee YX, Huang RZ, Zhao Y. Cobalt-Catalyzed Allylation of Heterobicyclic Alkenes: Ligand-Induced Divergent Reactivities. Angew Chem Int Ed Engl 2015; 54:13696-700. [DOI: 10.1002/anie.201506003] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 07/15/2015] [Indexed: 11/10/2022]
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Ball-Jones NR, Badillo JJ, Tran NT, Franz AK. Catalytic enantioselective carboannulation with allylsilanes. Angew Chem Int Ed Engl 2014; 53:9462-5. [PMID: 25045133 PMCID: PMC4795922 DOI: 10.1002/anie.201403607] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Indexed: 11/06/2022]
Abstract
The first catalytic asymmetric carboannulation with allylsilanes is presented. The enantioselective [3+2] annulation is catalyzed using a scandium(III)/indapybox complex with tetrakis-[3,5-bis(trifluoromethyl)phenyl]-borate (BArF) to enhance catalytic activity and control stereoselectivity. Functionalized cyclopentanes containing a quaternary carbon center are derived from alkylidene oxindole, coumarin, and malonate substrates with high stereoselectivity. The enantioselective 1,4-conjugate addition and enantioselective lactone formation (by trapping of the β-silyl carbocation) is also described.
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Affiliation(s)
- Nicolas R. Ball-Jones
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616 (USA)
| | - Joseph J. Badillo
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616 (USA)
| | - Ngon T. Tran
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616 (USA)
| | - Annaliese K. Franz
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616 (USA)
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Ball-Jones NR, Badillo JJ, Tran NT, Franz AK. Catalytic Enantioselective Carboannulation with Allylsilanes. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403607] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Silvi M, Renzi P, Rosato D, Margarita C, Vecchioni A, Bordacchini I, Morra D, Nicolosi A, Cari R, Sciubba F, Scarpino Schietroma DM, Bella M. Enantioselective aza-Michael addition of imides by using an integrated strategy involving the synthesis of a family of multifunctional catalysts, usage of multiple catalysis, and rational design of experiment. Chemistry 2013; 19:9973-8. [PMID: 23765568 DOI: 10.1002/chem.201301493] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Indexed: 11/07/2022]
Abstract
A challenging asymmetric reaction (aza-Michael addition of imides to enones) has been optimized through an integrated approach involving the synthesis of a family of organocatalysts, multiple catalysis (usage of additives), and finally with rational exploration of the chemical space by the application of the experiment design.
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Affiliation(s)
- Mattia Silvi
- Department of Chemistry, Sapienza University of Roma, P.le Aldo Moro 5, 00185 Roma, Italy
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Yamamoto Y, Yamada S, Nishiyama H. Copper-Catalyzed Regio- and Stereoselective Conjugate Allylation of Electron-Deficient Alkynes with Allylboronates under Mild Conditions. Chemistry 2012; 18:3153-6. [DOI: 10.1002/chem.201103697] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Indexed: 12/28/2022]
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18
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Hanhan NV, Ball-Jones NR, Tran NT, Franz AK. Catalytic Asymmetric [3+2] Annulation of Allylsilanes with Isatins: Synthesis of Spirooxindoles. Angew Chem Int Ed Engl 2011; 51:989-92. [DOI: 10.1002/anie.201105739] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2011] [Indexed: 11/09/2022]
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19
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Hanhan NV, Ball-Jones NR, Tran NT, Franz AK. Catalytic Asymmetric [3+2] Annulation of Allylsilanes with Isatins: Synthesis of Spirooxindoles. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105739] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Huang YY, Chakrabarti A, Morita N, Schneider U, Kobayashi S. A Catalytic Asymmetric Borono Variant of Hosomi-Sakurai Reactions with N,O-Aminals. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105182] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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21
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Huang YY, Chakrabarti A, Morita N, Schneider U, Kobayashi S. A Catalytic Asymmetric Borono Variant of Hosomi-Sakurai Reactions with N,O-Aminals. Angew Chem Int Ed Engl 2011; 50:11121-4. [DOI: 10.1002/anie.201105182] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2011] [Indexed: 11/07/2022]
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22
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Wang L, Meng W, Zhu CL, Zheng Y, Nie J, Ma JA. The Long-Arm Effect: Influence of Axially Chiral Phosphoramidite Ligands on the Diastereo- and Enantioselectivity of the Tandem 1,4-Addition/Fluorination. Angew Chem Int Ed Engl 2011; 50:9442-6. [DOI: 10.1002/anie.201104565] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Indexed: 11/11/2022]
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23
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Wang L, Meng W, Zhu CL, Zheng Y, Nie J, Ma JA. The Long-Arm Effect: Influence of Axially Chiral Phosphoramidite Ligands on the Diastereo- and Enantioselectivity of the Tandem 1,4-Addition/Fluorination. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104565] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Schietroma DMS, Monaco MR, Visca V, Insogna S, Overgaard J, Bella M. Enamine-Mediated Addition of Aldehydes to Cyclic Enones. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201000755] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Yanagida Y, Yazaki R, Kumagai N, Shibasaki M. Asymmetric Synthesis of Isothiazoles through Cu Catalysis: Direct Catalytic Asymmetric Conjugate Addition of Allyl Cyanide to α,β-Unsaturated Thioamides. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102467] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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26
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Yanagida Y, Yazaki R, Kumagai N, Shibasaki M. Asymmetric Synthesis of Isothiazoles through Cu Catalysis: Direct Catalytic Asymmetric Conjugate Addition of Allyl Cyanide to α,β-Unsaturated Thioamides. Angew Chem Int Ed Engl 2011; 50:7910-4. [DOI: 10.1002/anie.201102467] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2011] [Indexed: 11/06/2022]
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