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Gillespie JE, Fanourakis A, Phipps RJ. Strategies That Utilize Ion Pairing Interactions to Exert Selectivity Control in the Functionalization of C-H Bonds. J Am Chem Soc 2022; 144:18195-18211. [PMID: 36178308 PMCID: PMC9562467 DOI: 10.1021/jacs.2c08752] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Electrostatic attraction between two groups of opposite charge, typically known as ion-pairing, offers unique opportunities for the design of systems to enable selectivity control in chemical reactions. Catalysis using noncovalent interactions is an established and vibrant research area, but it is noticeable that hydrogen bonding interactions are still the main interaction of choice in system design. Opposite charges experience the powerful force of Coulombic attraction and have the ability to exert fundamental influence on the outcome of reactions that involve charged reagents, intermediates or catalysts. In this Perspective, we will examine how ion-pairing interactions have been used to control selectivity in C-H bond functionalization processes. This broad class of reactions provides an interesting and thought-provoking lens through which to examine the application of ion-pairing design strategies because it is one that encompasses great mechanistic diversity, poses significant selectivity challenges, and perhaps most importantly is of immense interest to synthetic chemists in both industry and academia. We survey reactions that proceed via radical and ionic mechanisms alongside those that involve transition metal catalysis and will deal with control of site-selectivity and enantioselectivity. We anticipate that as this emerging area develops, it will become an ever-more important design strategy for selectivity control.
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Affiliation(s)
- James E Gillespie
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Alexander Fanourakis
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Robert J Phipps
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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2
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Gaviña D, Escolano M, Rabasa Alcañiz F, Díaz Oltra S, Sanchez-Rosello M, del Pozo C. Tandem Asymmetric Cycloaromatization/intramolecular Pictet‐Spengler‐type Reaction. An Entry to Polycyclic Pyrroles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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3
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Nakamura S, Matsuda Y, Takehara T, Suzuki T. Enantioselective Pictet-Spengler Reaction of Acyclic α-Ketoesters Using Chiral Imidazoline-Phosphoric Acid Catalysts. Org Lett 2022; 24:1072-1076. [PMID: 35080408 DOI: 10.1021/acs.orglett.1c04316] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The first enantioselective Pictet-Spengler reaction of acyclic α-ketoesters with tryptamines has been developed. Excellent yields and enantioselectivity were obtained for the reaction using chiral imidazoline-phosphoric acid catalysts. Density functional theory calculations suggested possible transition states that explain the origin of chiral induction. This process provides an efficient route for the synthesis of tetrahydro-β-carboline derivatives.
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Affiliation(s)
- Shuichi Nakamura
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.,Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Yoichiro Matsuda
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan
| | - Tsunayoshi Takehara
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
| | - Takeyuki Suzuki
- The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan
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4
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Chan YC, Sak MH, Frank SA, Miller SJ. Tunable and Cooperative Catalysis for Enantioselective Pictet-Spengler Reaction with Varied Nitrogen-Containing Heterocyclic Carboxaldehydes. Angew Chem Int Ed Engl 2021; 60:24573-24581. [PMID: 34487418 PMCID: PMC8556314 DOI: 10.1002/anie.202109694] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/24/2021] [Indexed: 01/16/2023]
Abstract
Herein we report an organocatalytic enantioselective functionalization of heterocyclic carboxaldehydes via the Pictet-Spengler reaction. Through careful pairing of novel squaramide and Brønsted acid catalysts, our method tolerates a breadth of heterocycles, enabling preparation of a series of heterocycle conjugated β-(tetrahydro)carbolines in good yield and enantioselectivity. Careful selection of carboxylic acid co-catalyst is essential for toleration of a variety of regioisomeric heterocycles. Utility is demonstrated via the three-step stereoselective preparation of pyridine-containing analogues of potent selective estrogen receptor downregulator and U.S. FDA approved drug Tadalafil.
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Affiliation(s)
- Yuk-Cheung Chan
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
| | - Marcus H Sak
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
| | - Scott A Frank
- Synthetic Molecule Design and Development, Eli Lilly and Company, Indianapolis, IN, 46285, USA
| | - Scott J Miller
- Department of Chemistry, Yale University, New Haven, CT, 06520, USA
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5
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Chan Y, Sak MH, Frank SA, Miller SJ. Tunable and Cooperative Catalysis for Enantioselective Pictet‐Spengler Reaction with Varied Nitrogen‐Containing Heterocyclic Carboxaldehydes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yuk‐Cheung Chan
- Department of Chemistry Yale University New Haven CT 06520 USA
| | - Marcus H. Sak
- Department of Chemistry Yale University New Haven CT 06520 USA
| | - Scott A. Frank
- Synthetic Molecule Design and Development Eli Lilly and Company Indianapolis IN 46285 USA
| | - Scott J. Miller
- Department of Chemistry Yale University New Haven CT 06520 USA
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6
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Mironov VF, Dimukhametov MN, Ivkova GA, Khayarov KR, Islamov DR, Litvinov IA. The formation of cage phosphoranes and their rearrangements in the reactions of substituted 2-(3-oxo-3-phenyl)ethoxybenzo[d]-1,3,2-dioxaphospholes with perfluorodiacetyl. Chem Commun (Camb) 2021; 57:8516-8519. [PMID: 34352057 DOI: 10.1039/d1cc02941j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Kukhtin-Ramirez reaction of 2-(3-oxo-3-phenyl)ethoxy-benzo[d]-1,3,2-dioxaphospholes with perfluorodiacetyl was monitored by NMR methods. To our surprise the initial stage involved a kinetically controlled [4+4]-cycloaddition with the formation of a cage phosphorane containing a 2',5',8',9'-tetraoxa-2λ5-phosphaspiro[benzo[d][1,3,2]dioxaphosphole-2,1'-bicyclo[4.2.1]nonan]-3'-ene (compound 5) scaffold. Intermediate 5 then converts to spirophosphorane-4',5'-bis(trifluoromethyl)-2λ5-spiro[benzo[d] [1,3,2]dioxaphosphole-2-yl-2,2'-[1,3,2] dioxaphosphole (compound 4). Compound 4 further rearranges into a cage phosphorane derivative containing a [2,5]epoxybenzo[d][1,3,6,2]trioxaphosphocine] (compound 3) backbone.
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Affiliation(s)
- Vladimir F Mironov
- A.E.Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzov Str. 8, Kazan 420088, Russia.
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7
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Xiao X, Shao B, Lu Y, Cao Q, Xia C, Chen F. Recent Advances in Asymmetric Organomulticatalysis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000961] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xiao Xiao
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic China
| | - Bing‐Xuan Shao
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic China
| | - Yin‐Jie Lu
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic China
| | - Qian‐Qian Cao
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals Zhejiang University of Technology Hangzhou 310014 People's Republic China
| | - Chun‐Nian Xia
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
| | - Fen‐Er Chen
- Institute of Pharmaceutical Science and Technology Zhejiang University of Technology Hangzhou 310014 People's Republic China
- Engineering Center of Catalysis and Synthesis for Chiral Molecules Fudan University Shanghai 200433 People's Republic China
- Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs Shanghai 200433 People's Republic China
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8
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Jaillet A, Darcel C, Bayardon J, Schlachter A, Salomon C, Rousselin Y, Harvey P, Jugé S. Design of P-Chirogenic Aminophosphine–Phosphinite Ligands at Both Phosphorus Centers: Origin of Enantioselectivities in Pd-Catalyzed Allylic Reactions. J Org Chem 2020; 85:14391-14410. [DOI: 10.1021/acs.joc.0c00536] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Antonin Jaillet
- Université de Bourgogne-Franche-Comté, Institut de Chimie Moléculaire (ICMUB-OCS, UMR-CNRS 6302), BP 47870, Dijon 21078 Cedex, France
| | - Christophe Darcel
- Université de Rennes, Institut des Sciences Chimiques de Rennes (ISCR, UMR-CNRS 6626), 35000 Rennes, France
| | - Jérôme Bayardon
- Université de Bourgogne-Franche-Comté, Institut de Chimie Moléculaire (ICMUB-OCS, UMR-CNRS 6302), BP 47870, Dijon 21078 Cedex, France
| | - Adrien Schlachter
- Université de Sherbrooke, Département de Chimie, Sherbrooke, Quebec, Canada J1K2R1
| | - Christine Salomon
- Université de Bourgogne-Franche-Comté, Institut de Chimie Moléculaire (ICMUB-OCS, UMR-CNRS 6302), BP 47870, Dijon 21078 Cedex, France
| | - Yoann Rousselin
- Université de Bourgogne-Franche-Comté, Institut de Chimie Moléculaire (ICMUB-OCS, UMR-CNRS 6302), BP 47870, Dijon 21078 Cedex, France
| | - Pierre Harvey
- Université de Sherbrooke, Département de Chimie, Sherbrooke, Quebec, Canada J1K2R1
| | - Sylvain Jugé
- Université de Bourgogne-Franche-Comté, Institut de Chimie Moléculaire (ICMUB-OCS, UMR-CNRS 6302), BP 47870, Dijon 21078 Cedex, France
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9
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Uraguchi D, Ueoka F, Tanaka N, Kizu T, Takahashi W, Ooi T. A Structurally Robust Chiral Borate Ion: Molecular Design, Synthesis, and Asymmetric Catalysis. Angew Chem Int Ed Engl 2020; 59:11456-11461. [DOI: 10.1002/anie.202001637] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/12/2020] [Indexed: 02/02/2023]
Affiliation(s)
- Daisuke Uraguchi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Fumito Ueoka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Naoya Tanaka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Tomohito Kizu
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Wakana Takahashi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Takashi Ooi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Nagoya 464-8601 Japan
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10
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Uraguchi D, Ueoka F, Tanaka N, Kizu T, Takahashi W, Ooi T. A Structurally Robust Chiral Borate Ion: Molecular Design, Synthesis, and Asymmetric Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Daisuke Uraguchi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Fumito Ueoka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Naoya Tanaka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Tomohito Kizu
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Wakana Takahashi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Takashi Ooi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Nagoya 464-8601 Japan
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11
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Viji M, Vishwanath M, Sim J, Park Y, Jung C, Lee S, Lee H, Lee K, Jung JK. α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and other N-heterocycles via decarboxylative oxidative annulation reaction. RSC Adv 2020; 10:37202-37208. [PMID: 35521290 PMCID: PMC9057147 DOI: 10.1039/d0ra07093a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/04/2020] [Indexed: 01/18/2023] Open
Abstract
A metal-free and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include the in situ generation of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford the corresponding quinoxalines, quinazolinones derivatives in moderate to high yields. A TBHP mediated, metal-free approach for the synthesis of quinoxalines, quinazolinones, and indolo quinoxaline was developed from alpha hydroxy acids via decarboxylation followed by condensation.![]()
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Affiliation(s)
- Mayavan Viji
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Manjunatha Vishwanath
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Jaeuk Sim
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Yunjeong Park
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Chanhyun Jung
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Seohu Lee
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Heesoon Lee
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
| | - Kiho Lee
- College of Pharmacy
- Korea University
- Sejong 30019
- Republic of Korea
| | - Jae-Kyung Jung
- College of Pharmacy
- Medicinal Research Center (MRC)
- Chungbuk National University
- Cheongju 28160
- Republic of Korea
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12
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Jiang XD, Toya Y, Matsukawa S, Kojima S, Jimenez-Halla JOC, Shang R, Nakamoto M, Yamamoto Y. Synthesis and characterization of a pair of O- fac/O- mer 12-P-6 alkyloxaphosphates with a P-O-C-C four-membered ring. Chem Sci 2019; 10:3466-3472. [PMID: 30996936 PMCID: PMC6432329 DOI: 10.1039/c8sc05158e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/15/2019] [Indexed: 11/21/2022] Open
Abstract
The synthesis and characterization of a stereoisomer pair of 12-P-6 alkyloxaphosphates synthesised from pentacoordinate phosphoranes.
Structurally characterized hexacoordinate organophosphorus compounds remain rare due to their highly reactive nature and thermal instability. Herein we report the first synthesis of a pair of O-facial and O-meridional hexacoordinate oxaphosphates (5B and 5D) obtained from the O-apical and O-equatorial β-hydroxyalkylphosphoranes 3 and 4. This was achieved by using the bulky C2F5-groups on the ortho-substituted aryl backbone. Calculations of the relative energies of possible isomers indicate 5B and 5D are thermodynamic products. Although the mechanisms of their formation and the determining factor of stereo-selectivity are still unclear, their isolation and structure conformation contributes to a formulation of a viable strategy for diastereoselective synthesis of heteroleptic hexacoordinate organophosphates.
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Affiliation(s)
- Xin-Dong Jiang
- College of Applied Chemistry , Shenyang University of Chemical Technology , Shenyang , 110142 , China
| | - Yuya Toya
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Shiro Matsukawa
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Satoshi Kojima
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - J Oscar C Jimenez-Halla
- Department of Chemistry , Division of Natural and Exact Sciences , University of Guanajuato , Campus Gto, Noria Alta s/n 36050 , Guanajuato , Mexico
| | - Rong Shang
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Masaaki Nakamoto
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
| | - Yohsuke Yamamoto
- Department of Chemistry , Graduate School of Science , Hiroshima University , Higashi-hiroshima , 7398526 , Japan .
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13
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Mörsdorf JM, Wadepohl H, Ballmann J. A Tautomeric λ 3/λ 5-Phosphane Pair and Its Ambiphilic Reactivity. Inorg Chem 2019; 58:3502-3508. [PMID: 30777436 DOI: 10.1021/acs.inorgchem.9b00076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The central phosphorus atom of a novel hydroxyl-functionalized triarylphosphane was shown to reversibly insert into one of the molecule's O-H bonds, which forms the basis for a tautomeric λ3/λ5-phosphane equilibrium. For the first time, this equilibrium was detected for a λ3-triarylphosphane and the underlying dynamic process was elucidated by NMR spectroscopy. On the basis of reactivity studies, a nucleophilic character was assigned to the minor species present in solution, the λ3-phosphane. Upon methylation, for example, the λ3-form was selectively removed from the equilibrium and converted to the corresponding phosphonium salt. However, upon generation of an alkoxide via proton abstraction, the electrophilic character of the λ5-phosphane in the equilibrium became evident since the alkoxide was found to attack the molecule's phosphorus atom. This intramolecular reaction led to the selective formation of a new anionic λ6-hydridospirophosphane.
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Affiliation(s)
- Jean-Marc Mörsdorf
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 276 , 69120 Heidelberg , Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 276 , 69120 Heidelberg , Germany
| | - Joachim Ballmann
- Anorganisch-Chemisches Institut , Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 276 , 69120 Heidelberg , Germany
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14
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Barrios-Rivera J, Xu Y, Wills M. Applications of N′-monofunctionalised TsDPEN derivatives in asymmetric catalysis. Org Biomol Chem 2019; 17:1301-1321. [DOI: 10.1039/c8ob02889c] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
N′-Monoalkylated or N′-mono(thio)acylated(N-sulfonyl)-1,2-diphenylethylene-1,2-diamine (TsDPEN) derivatives are have found extensive applications in asymmetric catalysis of a wide range of synthetic applications.
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Affiliation(s)
| | - Yingjian Xu
- GoldenKeys High-tech Materials Co. Ltd
- Building B
- Innovation & Entrepreneurship Park
- Guian New Area
- China
| | - Martin Wills
- Department of Chemistry
- Warwick University
- Coventry CV4 7AL
- UK
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15
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Zhan C, Han Z, Patrick BO, Gates DP. 2-Aminophenolate ligands for phosphorus(v): a lithium salt featuring the chiral [P(OC 6H 4NR) 3] - anion. Dalton Trans 2018; 47:12118-12129. [PMID: 30065977 DOI: 10.1039/c8dt02522c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Phosphoranes P(OC6H4NR)2(OC6H4NHR) [R = Me (2a), Ph (2b), C6F5 (2c)] were synthesized by treating PCl5 with the respective 2-aminophenol derivative (1a-c, 3.1 equiv.). In one instance, an intermediate species, P(OC6H4NR)2Cl [R = Me (3a)], was isolated and structurally characterized. Deprotonation of the amine moieties (-NH[combining low line]R) in phosphoranes 2a and 2b with a strong alkali-metal base (e.g. n-BuLi) in the presence of a strong-donor solvent (e.g. THF) afforded salts composed of the hexacoordinate P(v)-anions [P(OC6H4NR)3]- (R = Me, [4a]-; Ph, [4b]-). Employing precursor 2a, the salt Li(THF)3fac-[4a]- was isolated. The X-ray crystal of each enantiomer of [4a]- was determined and, to our knowledge, represents the first structurally characterized example of a salt containing a hexacoordinate P(v)N3O3 anion featuring P(v)-N bonds.
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Affiliation(s)
- Chuantian Zhan
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, CanadaV6T 1Z1.
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