1
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Khatua B, Ghosh A, Ray AK, Banerjee N, Dey J, Paul A, Guin J. Photocatalytic Synthesis of β-Keto Primary Chlorides by Selective Chlorocarbonylation of Olefins. Angew Chem Int Ed Engl 2024; 63:e202402849. [PMID: 38389271 DOI: 10.1002/anie.202402849] [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: 02/08/2024] [Revised: 02/22/2024] [Accepted: 02/22/2024] [Indexed: 02/24/2024]
Abstract
Functionalized primary alkyl chlorides are precursors to a plethora of scaffolds but their access from chemical feedstocks remains challenging. Herein, we report a concise dual Ni/photoredox catalytic protocol for regioselective chlorocarbonylation of unactivated alkenes that enables rapid access to β-keto primary chlorides. The catalytic process features an extensive substrate scope, scalability and functional group tolerance. The Ni/photocatalytic Cl⋅ generation and subsequent cross-coupling is implicated for the process based on the control experiments and DFT study. The synthetic utility of the protocol has been further corroborated through functionalization of complex substrates and modifications of the product.
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Affiliation(s)
- Bitasik Khatua
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Anjulika Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Anuj Kumar Ray
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Nayan Banerjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Jayanta Dey
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Ankan Paul
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
| | - Joyram Guin
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2 A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, India
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2
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Moon H, Jung J, Choi JH, Chung WJ. Stereospecific syn-dihalogenations and regiodivergent syn-interhalogenation of alkenes via vicinal double electrophilic activation strategy. Nat Commun 2024; 15:3710. [PMID: 38697968 PMCID: PMC11066093 DOI: 10.1038/s41467-024-47942-w] [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: 01/20/2024] [Accepted: 04/12/2024] [Indexed: 05/05/2024] Open
Abstract
Whereas the conventional anti-dihalogenation of alkenes is a valuable synthetic tool with highly predictable stereospecificity, the restricted reaction mechanism makes it challenging to alter the diastereochemical course into the complementary syn-dihalogenation process. Only a few notable achievements were made recently by inverting one of the stereocenters after anti-addition using a carefully designed reagent system. Here, we report a conceptually distinctive strategy for the simultaneous double electrophilic activation of the two alkene carbons from the same side. Then, the resulting vicinal leaving groups can be displaced iteratively by nucleophilic halides to complete the syn-dihalogenation. For this purpose, thianthrenium dication is employed, and all possible combinations of chlorine and bromine are added onto internal alkenes successfully, particularly resulting in the syn-dibromination and the regiodivergent syn-bromochlorination.
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Affiliation(s)
- Hyeon Moon
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Jungi Jung
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Jun-Ho Choi
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
| | - Won-Jin Chung
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.
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3
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Zwick P, Troncossi A, Borsley S, Vitorica-Yrezabal IJ, Leigh DA. Stepwise Operation of a Molecular Rotary Motor Driven by an Appel Reaction. J Am Chem Soc 2024; 146:4467-4472. [PMID: 38319727 PMCID: PMC10885133 DOI: 10.1021/jacs.3c10266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
To date, only a small number of chemistries and chemical fueling strategies have been successfully used to operate artificial molecular motors. Here, we report the 360° directionally biased rotation of phenyl groups about a C-C bond, driven by a stepwise Appel reaction sequence. The motor molecule consists of a biaryl-embedded phosphine oxide and phenol, in which full rotation around the biaryl bond is blocked by the P-O oxygen atom on the rotor being too bulky to pass the oxygen atom on the stator. Treatment with SOCl2 forms a cyclic oxyphosphonium salt (removing the oxygen atom of the phosphine oxide), temporarily linking the rotor with the stator. Conformational exchange via ring flipping then allows the rotor and stator to twist back and forth past the previous limit of rotation. Subsequently, the ring opening of the tethered intermediate with a chiral alcohol occurs preferentially through a nucleophilic attack on one face. Thus, the original phosphine oxide is reformed with net directional rotation about the biaryl bond over the course of the two-step reaction sequence. Each repetition of SOCl2-chiral alcohol additions generates another directionally biased rotation. Using the same reaction sequence on a derivative of the motor molecule that forms atropisomers rather than fully rotating 360° results in enantioenrichment, suggesting that, on average, the motor molecule rotates in the "wrong" direction once every three fueling cycles. The interconversion of phosphine oxides and cyclic oxyphosphonium groups to form temporary tethers that enable a rotational barrier to be overcome directionally adds to the strategies available for generating chemically fueled kinetic asymmetry in molecular systems.
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Affiliation(s)
- Patrick Zwick
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Axel Troncossi
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Stefan Borsley
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | | | - David A Leigh
- Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
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4
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Tönjes J, Kell L, Werner T. Organocatalytic Stereospecific Appel Reaction. Org Lett 2023; 25:9114-9118. [PMID: 38113448 DOI: 10.1021/acs.orglett.3c03463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
Herein we report a new method for the catalytic Appel reaction by P(III)/P(V) redox cycling at very low catalyst loadings of 1-2 mol % using low amounts of hexachloroacetone as the halogen source and phenylsilane as the terminal reductant. Twenty-six alcohols and nine epoxides containing a wide variety of functional groups were converted to the respective chlorides and dichlorides in yields of up to 97%, enantiospecificities of up to >99%, and enantiomeric ratios of up to >99:1.
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Affiliation(s)
- Jan Tönjes
- Leibniz Institute for Catalysis at the University of Rostock (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Lukas Kell
- Leibniz Institute for Catalysis at the University of Rostock (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059 Rostock, Germany
| | - Thomas Werner
- Leibniz Institute for Catalysis at the University of Rostock (LIKAT Rostock), Albert-Einstein-Str. 29a, 18059 Rostock, Germany
- Department of Chemistry and Center for Sustainable Systems Design (CSSD), Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany
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5
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Pei M, Tian A, Yang Q, Huang N, Wang L, Li D. Organophosphorus catalytic reaction based on reduction of phosphine oxide. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.10.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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6
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Lu M, Fan H, Liu Q, Sun X. A Facile Synthetic Method for Anhydride from Carboxylic Acid with the Promotion of Triphenylphosphine Oxide and Oxaloyl Chloride. ACS OMEGA 2022; 7:34352-34358. [PMID: 36188305 PMCID: PMC9520564 DOI: 10.1021/acsomega.2c03991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
A highly efficient synthesis reaction of carboxylic anhydrides catalyzed by triphenylphosphine oxide is described for the quick synthesis of a range of symmetric carboxylic anhydrides and cyclic anhydrides under mild and neutral conditions with a high yield. The system adopts the strong reactive intermediate Ph3PCl2 as the catalyst of carboxylic acid salt; driven by catalytic reaction, the synthesis takes a relatively short time to complete.
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7
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Yamashita K, Hirokawa R, Ichikawa M, Hisanaga T, Nagao Y, Takita R, Watanabe K, Kawato Y, Hamashima Y. Mechanistic Details of Asymmetric Bromocyclization with BINAP Monoxide: Identification of Chiral Proton-Bridged Bisphosphine Oxide Complex and Its Application to Parallel Kinetic Resolution. J Am Chem Soc 2022; 144:3913-3924. [PMID: 35226811 DOI: 10.1021/jacs.1c11816] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The mechanism of our previously reported catalytic asymmetric bromocyclization reactions using 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl (BINAP) monoxide was examined in detail by the means of control experiments, NMR studies, X-ray structure analysis, and CryoSpray electrospray ionization mass spectrometry (ESI-MS) analysis. The chiral BINAP monoxide was transformed to a key catalyst precursor, proton-bridged bisphosphine oxide complex (POHOP·Br), in the presence of N-bromosuccinimide (NBS) and contaminating water. The thus-formed POHOP further reacts with NBS to afford BINAP dioxide and molecular bromine (Br2) simultaneously in equimolar amounts. While the resulting Br2 is activated by NBS to form a more reactive brominating reagent (Br2─NBS), BINAP dioxide serves as a bifunctional catalyst, acting as both a Lewis base that reacts with Br2─NBS to form a chiral brominating agent (P═O+─Br) and also as a Brønsted base for the activation of the substrate. By taking advantage of this novel concerted Lewis/Brønsted base catalysis by BINAP dioxide, we achieved the first regio- and chemodivergent parallel kinetic resolutions (PKRs) of racemic unsymmetrical bisallylic amides via bromocyclization.
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Affiliation(s)
- Kenji Yamashita
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Ryo Hirokawa
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Mamoru Ichikawa
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Tatsunari Hisanaga
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yoshihiro Nagao
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Ryo Takita
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kohei Watanabe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yuji Kawato
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
| | - Yoshitaka Hamashima
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan
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8
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Noushini S, Park SJ, Perez J, Holgate D, Mendez V, Jamie IM, Jamie JF, Taylor PW. Electrophysiological Responses of Bactrocera kraussi (Hardy) (Tephritidae) to Rectal Gland Secretions and Headspace Volatiles Emitted by Conspecific Males and Females. Molecules 2021; 26:5024. [PMID: 34443611 PMCID: PMC8399695 DOI: 10.3390/molecules26165024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/09/2021] [Accepted: 08/16/2021] [Indexed: 11/16/2022] Open
Abstract
Pheromones are biologically important in fruit fly mating systems, and also have potential applications as attractants or mating disrupters for pest management. Bactrocera kraussi (Hardy) (Diptera: Tephritidae) is a polyphagous pest fruit fly for which the chemical profile of rectal glands is available for males but not for females. There have been no studies of the volatile emissions of either sex or of electrophysiological responses to these compounds. The present study (i) establishes the chemical profiles of rectal gland contents and volatiles emitted by both sexes of B. kraussi by gas chromatography-mass spectrometry (GC-MS) and (ii) evaluates the detection of the identified compounds by gas chromatography-electroantennogram detection (GC-EAD) and -electropalpogram detection (GC-EPD). Sixteen compounds are identified in the rectal glands of male B. kraussi and 29 compounds are identified in the rectal glands of females. Of these compounds, 5 were detected in the headspace of males and 13 were detected in the headspace of females. GC-EPD assays recorded strong signals in both sexes against (E,E)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane, 2-ethyl-7-mehtyl-1,6-dioxaspiro[4.5]decane isomer 2, (E,Z)/(Z,E)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane, and (Z,Z)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane. Male antennae responded to (E,E)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane, 2-methyl-6-pentyl-3,4-dihydro-2H-pyran, 6-hexyl-2-methyl-3,4-dihydro-2H-pyran, 6-oxononan-1-ol, ethyl dodecanoate, ethyl tetradecanoate and ethyl (Z)-hexadec-9-enoate, whereas female antennae responded to (E,E)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane and 2-methyl-6-pentyl-3,4-dihydro-2H-pyran only. These compounds are candidates as pheromones mediating sexual interactions in B. kraussi.
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Affiliation(s)
- Sally Noushini
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia; (D.H.); (I.M.J.); (J.F.J.)
- Australian Research Council Industrial Transformation Training Centre for Fruit Fly Biosecurity Innovation, Macquarie University, Sydney, NSW 2109, Australia; (S.J.P.); (J.P.); (V.M.); (P.W.T.)
| | - Soo Jean Park
- Australian Research Council Industrial Transformation Training Centre for Fruit Fly Biosecurity Innovation, Macquarie University, Sydney, NSW 2109, Australia; (S.J.P.); (J.P.); (V.M.); (P.W.T.)
- Applied BioSciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Jeanneth Perez
- Australian Research Council Industrial Transformation Training Centre for Fruit Fly Biosecurity Innovation, Macquarie University, Sydney, NSW 2109, Australia; (S.J.P.); (J.P.); (V.M.); (P.W.T.)
- Applied BioSciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Danielle Holgate
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia; (D.H.); (I.M.J.); (J.F.J.)
| | - Vivian Mendez
- Australian Research Council Industrial Transformation Training Centre for Fruit Fly Biosecurity Innovation, Macquarie University, Sydney, NSW 2109, Australia; (S.J.P.); (J.P.); (V.M.); (P.W.T.)
- Applied BioSciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Ian M. Jamie
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia; (D.H.); (I.M.J.); (J.F.J.)
| | - Joanne F. Jamie
- Department of Molecular Sciences, Macquarie University, Sydney, NSW 2109, Australia; (D.H.); (I.M.J.); (J.F.J.)
| | - Phillip W. Taylor
- Australian Research Council Industrial Transformation Training Centre for Fruit Fly Biosecurity Innovation, Macquarie University, Sydney, NSW 2109, Australia; (S.J.P.); (J.P.); (V.M.); (P.W.T.)
- Applied BioSciences, Macquarie University, Sydney, NSW 2109, Australia
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9
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Chen Y, He R, Song H, Yu G, Li C, Liu Y, Wang Q. Two‐Step Protocol for Iodotrimethylsilane‐Mediated Deoxy‐Functionalization of Alcohols. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001602] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuming Chen
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
| | - Ru He
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
| | - Guoqing Yu
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
- Shandong Boyuan Pharmaceutical & Chemical Co., Ltd 262725 Shouguang People's Republic of China
| | - Chenglin Li
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
- Shandong Boyuan Pharmaceutical & Chemical Co., Ltd 262725 Shouguang People's Republic of China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry Research Institute of Elemento-Organic Chemistry College of Chemistry Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Nankai University 300071 Tianjin People's Republic of China
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10
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Lipshultz JM, Li G, Radosevich AT. Main Group Redox Catalysis of Organopnictogens: Vertical Periodic Trends and Emerging Opportunities in Group 15. J Am Chem Soc 2021; 143:1699-1721. [PMID: 33464903 PMCID: PMC7934640 DOI: 10.1021/jacs.0c12816] [Citation(s) in RCA: 117] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A growing number of organopnictogen redox catalytic methods have emerged-especially within the past 10 years-that leverage the plentiful reversible two-electron redox chemistry within Group 15. The goal of this Perspective is to provide readers the context to understand the dramatic developments in organopnictogen catalysis over the past decade with an eye toward future development. An exposition of the fundamental differences in the atomic structure and bonding of the pnictogens, and thus the molecular electronic structure of organopnictogen compounds, is presented to establish the backdrop against which organopnictogen redox reactivity-and ultimately catalysis-is framed. A deep appreciation of these underlying periodic principles informs an understanding of the differing modes of organopnictogen redox catalysis and evokes the key challenges to the field moving forward. We close by addressing forward-looking directions likely to animate this area in the years to come. What new catalytic manifolds can be developed through creative catalyst and reaction design that take advantage of the intrinsic redox reactivity of the pnictogens to drive new discoveries in catalysis?
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Affiliation(s)
- Jeffrey M Lipshultz
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Gen Li
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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11
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Dong X, Roeckl JL, Waldvogel SR, Morandi B. Merging shuttle reactions and paired electrolysis for reversible vicinal dihalogenations. Science 2021; 371:507-514. [DOI: 10.1126/science.abf2974] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 12/30/2020] [Indexed: 12/16/2022]
Affiliation(s)
- Xichang Dong
- Laboratory of Organic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
| | - Johannes L. Roeckl
- Laboratory of Organic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
- Department of Chemistry, Johannes Gutenberg University, Mainz, Germany
| | | | - Bill Morandi
- Laboratory of Organic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, Zürich, Switzerland
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12
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Zoller B, Stach T, Huy PH. Lewis Base Catalysis Enables the Activation of Alcohols by means of Chloroformates as Phosgene Substitutes. ChemCatChem 2020. [DOI: 10.1002/cctc.202001175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Ben Zoller
- Saarland University Organic Chemistry P. O. Box 151150 66041 Saarbrücken Germany
- Current address Helmholtz Institute for Pharmaceutical Research Saarland (HIPS) University Campus E8.1, room 2.29 66123 Saarbrücken Germany
| | - Tanja Stach
- Saarland University Organic Chemistry P. O. Box 151150 66041 Saarbrücken Germany
- Current address: Endotherm GmbH Science Park 2 66123 Saarbrücken Germany
| | - Peter H. Huy
- Saarland University Organic Chemistry P. O. Box 151150 66041 Saarbrücken Germany
- Rostock University Institute for Chemistry Albert-Einstein-Str. 3A 18059 Rostock Germany
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13
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Kohlmeyer C, Schäfer A, Huy PH, Hilt G. Formamide-Catalyzed Nucleophilic Substitutions: Mechanistic Insight and Rationalization of Catalytic Activity. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03348] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Corinna Kohlmeyer
- Oldenburg University, Institute of Chemistry, Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany
| | - André Schäfer
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, 66123 Saarbruecken, Germany
| | - Peter H. Huy
- Rostock University, Institute for Chemistry, Albert-Einstein-Straße 3A, 18059 Rostock, Germany
| | - Gerhard Hilt
- Oldenburg University, Institute of Chemistry, Carl-von-Ossietzky-Str. 9-11, 26111 Oldenburg, Germany
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14
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Li G, Nykaza TV, Cooper JC, Ramirez A, Luzung MR, Radosevich AT. An Improved P III/P V═O-Catalyzed Reductive C-N Coupling of Nitroaromatics and Boronic Acids by Mechanistic Differentiation of Rate- and Product-Determining Steps. J Am Chem Soc 2020; 142:6786-6799. [PMID: 32178514 PMCID: PMC7146866 DOI: 10.1021/jacs.0c01666] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
![]()
Experimental,
spectroscopic, and computational studies are reported
that provide an evidence-based mechanistic description of an intermolecular
reductive C–N coupling of nitroarenes and arylboronic acids
catalyzed by a redox-active main-group catalyst (1,2,2,3,4,4-hexamethylphosphetane P-oxide, i.e., 1·[O]). The central observations
include the following: (1) catalytic reduction of 1·[O]
to PIII phosphetane 1 is kinetically fast
under conditions of catalysis; (2) phosphetane 1 represents
the catalytic resting state as observed by 31P NMR spectroscopy;
(3) there are no long-lived nitroarene partial-reduction intermediates
observable by 15N NMR spectroscopy; (4) the reaction is
sensitive to solvent dielectric, performing best in moderately polar
solvents (viz. cyclopentylmethyl ether); and (5) the reaction is largely
insensitive with respect to common hydrosilane reductants. On the
basis of the foregoing studies, new modified catalytic conditions
are described that expand the reaction scope and provide for mild
temperatures (T ≥ 60 °C), low catalyst
loadings (≥2 mol%), and innocuous terminal reductants (polymethylhydrosiloxane).
DFT calculations define a two-stage deoxygenation sequence for the
reductive C–N coupling. The initial deoxygenation involves
a rate-determining step that consists of a (3+1) cheletropic addition
between the nitroarene substrate and phosphetane 1; energy
decomposition techniques highlight the biphilic character of the phosphetane
in this step. Although kinetically invisible, the second deoxygenation
stage is implicated as the critical C–N product-forming event,
in which a postulated oxazaphosphirane intermediate is diverted from
arylnitrene dissociation toward heterolytic ring opening with the
arylboronic acid; the resulting dipolar intermediate evolves by antiperiplanar
1,2-migration of the organoboron residue to nitrogen, resulting in
displacement of 1·[O] and formation of the target
C–N coupling product upon in situ hydrolysis.
The method thus described constitutes a mechanistically well-defined
and operationally robust main-group complement to the current workhorse
transition-metal-based methods for catalytic intermolecular C–N
coupling.
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Affiliation(s)
- Gen Li
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Trevor V Nykaza
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Julian C Cooper
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Antonio Ramirez
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Michael R Luzung
- Chemical and Synthetic Development, Bristol-Myers Squibb Company, One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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15
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Huy PH. Lewis Base Catalysis Promoted Nucleophilic Substitutions – Recent Advances and Future Directions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901495] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Peter H. Huy
- Institute for Organic Chemistry Saarland University P. O. Box 151150 66041 Saarbruecken Germany
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16
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Ángel AYB, Bragança EF, Alberto EE. Dichlorination of Alkenes Using 1,3‐Dichloro‐5,5‐Dimethylhydantoin and ZnCl
2. ChemistrySelect 2019. [DOI: 10.1002/slct.201902568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Alix Y. Bastidas Ángel
- Department of ChemistryFederal University of Minas Gerais, Belo Horizonte 31.270-901 MG Brazil
| | - Emanuella F. Bragança
- Department of ChemistryFederal University of Minas Gerais, Belo Horizonte 31.270-901 MG Brazil
| | - Eduardo E. Alberto
- Department of ChemistryFederal University of Minas Gerais, Belo Horizonte 31.270-901 MG Brazil
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17
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Pongener I, Nikitin K, McGarrigle EM. Synthesis of glycosyl chlorides using catalytic Appel conditions. Org Biomol Chem 2019; 17:7531-7535. [PMID: 31369028 DOI: 10.1039/c9ob01544b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The stereoselective synthesis of glycosyl chlorides using catalytic Appel conditions is described. Good yields of α-glycosyl chlorides were obtained using a range of glycosyl hemiacetals, oxalyl chloride and 5 mol% Ph3PO. For 2-deoxysugars treatment of the corresponding hemiacetals with oxalyl chloride without phosphine oxide catalyst also gave good yields of glycosyl chloride. The method is operationaly simple and the 5 mol% phosphine oxide by-product can be removed easily. Alternatively a one-pot, multi-catalyst glycosylation can be carried out to transform the glycosyl hemiacetal directly to a glycoside.
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Affiliation(s)
- Imlirenla Pongener
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Kirill Nikitin
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
| | - Eoghan M McGarrigle
- Centre for Synthesis and Chemical Biology, UCD School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.
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18
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Lecomte M, Lipshultz JM, Kim-Lee SH, Li G, Radosevich AT. Driving Recursive Dehydration by P III/P V Catalysis: Annulation of Amines and Carboxylic Acids by Sequential C-N and C-C Bond Formation. J Am Chem Soc 2019; 141:12507-12512. [PMID: 31345031 PMCID: PMC6693942 DOI: 10.1021/jacs.9b06277] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
A method
for the annulation of amines and carboxylic acids to form
pharmaceutically relevant azaheterocycles via organophosphorus PIII/PV redox catalysis is reported. The method employs
a phosphetane catalyst together with a mild bromenium oxidant and
terminal hydrosilane reductant to drive successive C–N and
C–C bond-forming dehydration events via the serial action of
a catalytic bromophosphonium intermediate. These results demonstrate
the capacity of PIII/PV redox catalysis to enable
iterative redox-neutral transformations in complement to the common
reductive driving force of the PIII/PV couple.
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Affiliation(s)
- Morgan Lecomte
- Department of Chemistry , Massachusetts Institute of Technology , 02139 Cambridge , Massachusetts , United States
| | - Jeffrey M Lipshultz
- Department of Chemistry , Massachusetts Institute of Technology , 02139 Cambridge , Massachusetts , United States
| | - Shin-Ho Kim-Lee
- Department of Chemistry , Massachusetts Institute of Technology , 02139 Cambridge , Massachusetts , United States.,Departamento de Química Orgánica, Facultad de Ciencias , Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid , Spain
| | - Gen Li
- Department of Chemistry , Massachusetts Institute of Technology , 02139 Cambridge , Massachusetts , United States
| | - Alexander T Radosevich
- Department of Chemistry , Massachusetts Institute of Technology , 02139 Cambridge , Massachusetts , United States
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19
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Sarie JC, Neufeld J, Daniliuc CG, Gilmour R. Catalytic Vicinal Dichlorination of Unactivated Alkenes. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02313] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jérôme C. Sarie
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
| | - Jessica Neufeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
| | - Ryan Gilmour
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 40, 48149 Münster, Germany
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20
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Mohammadkhani L, Heravi MM. Oxalyl Chloride: A Versatile Reagent in Organic Transformations. ChemistrySelect 2019. [DOI: 10.1002/slct.201900120] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Leyla Mohammadkhani
- Department of Chemistry, School of SciencesAlzahra University Vanak, Tehran Iran
| | - Majid M. Heravi
- Department of Chemistry, School of SciencesAlzahra University Vanak, Tehran Iran
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21
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Longwitz L, Jopp S, Werner T. Organocatalytic Chlorination of Alcohols by P(III)/P(V) Redox Cycling. J Org Chem 2019; 84:7863-7870. [DOI: 10.1021/acs.joc.9b00741] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lars Longwitz
- Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Stefan Jopp
- Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Thomas Werner
- Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Straße 29a, 18059 Rostock, Germany
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22
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Abstract
Selenium-based catalysts, including organo- and inorganoselenium ones, in organic synthesis in the recent decade are reviewed.
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Affiliation(s)
- Lixiong Shao
- College of Chemistry and Materials Engineering
- Wenzhou University
- Chashan University Town
- Wenzhou
- P. R. China
| | - Yiming Li
- Shanghai Key Laboratory of Green Chemistry and Chemical Process
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
| | - Jianmei Lu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Chashan University Town
- Wenzhou
- P. R. China
| | - Xuefeng Jiang
- Shanghai Key Laboratory of Green Chemistry and Chemical Process
- School of Chemistry and Molecular Engineering
- East China Normal University
- Shanghai 200062
- P. R. China
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23
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Wang Y, Chen Q, He M, Wang L. Polystyrene-supported phosphine oxide-catalysed Beckmann rearrangement of ketoximes in 1,1,1,3,3,3-hexafluoro-2-propanol. PHOSPHORUS SULFUR 2018. [DOI: 10.1080/10426507.2018.1539489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Yaoyao Wang
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou, P. R. China
| | - Qun Chen
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou, P. R. China
| | - Mingyang He
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou, P. R. China
| | - Liang Wang
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou, P. R. China
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24
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Abstract
The hallmark of nucleophilic phosphine catalysis is the initial nucleophilic addition of a phosphine to an electrophilic starting material, producing a reactive zwitterionic intermediate, generally under mild conditions. In this Review, we classify nucleophilic phosphine catalysis reactions in terms of their electrophilic components. In the majority of cases, these electrophiles possess carbon-carbon multiple bonds: alkenes (section 2), allenes (section 3), alkynes (section 4), and Morita-Baylis-Hillman (MBH) alcohol derivatives (MBHADs; section 5). Within each of these sections, the reactions are compiled based on the nature of the second starting material-nucleophiles, dinucleophiles, electrophiles, and electrophile-nucleophiles. Nucleophilic phosphine catalysis reactions that occur via the initial addition to starting materials that do not possess carbon-carbon multiple bonds are collated in section 6. Although not catalytic in the phosphine, the formation of ylides through the nucleophilic addition of phosphines to carbon-carbon multiple bond-containing compounds is intimately related to the catalysis and is discussed in section 7. Finally, section 8 compiles miscellaneous topics, including annulations of the Hüisgen zwitterion, phosphine-mediated reductions, iminophosphorane organocatalysis, and catalytic variants of classical phosphine oxide-generating reactions.
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Affiliation(s)
- Hongchao Guo
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yi Chiao Fan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569, USA
| | - Zhanhu Sun
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Yang Wu
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, P. R. China
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569, USA
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25
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Chen J, Lin JH, Xiao JC. Dehydroxylation of alcohols for nucleophilic substitution. Chem Commun (Camb) 2018; 54:7034-7037. [PMID: 29873348 DOI: 10.1039/c8cc03856b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The Ph3P/ICH2CH2I system-promoted dehydroxylative substitution of alcohols was achieved to construct C-O, C-N, C-S and C-X (X = Cl, Br, and I) bonds. Compared with the previous approaches such as the Appel reaction and Mitsunobu reaction, this protocol offers some practical advantages such as safe operation and a convenient amination process.
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Affiliation(s)
- Jia Chen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China.
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26
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Schoene J, Bel Abed H, Schmieder P, Christmann M, Nazaré M. A General One-Pot Synthesis of 2H-Indazoles Using an Organophosphorus-Silane System. Chemistry 2018; 24:9090-9100. [PMID: 29644761 DOI: 10.1002/chem.201800763] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Indexed: 11/11/2022]
Abstract
A simple and direct approach for the regioselective construction of the privileged 2H-indazole scaffold is described. The developed one-pot strategy involves phospholene-mediated N-N bond formation to access 2H-indazoles. The amount of organophosphorus reagent was minimized by recycling the phospholene oxide with organosilane reductants. Starting from functionalized 2-nitrobenzaldehydes and primary amines, a mild reductive cyclization, involving the use of commercially available phospholene oxide and silanes, delivered a wide variety of substituted 2H-indazoles in good to excellent yields.
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Affiliation(s)
- Jens Schoene
- Departments of Chemical Biology and Structural Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Campus Berlin-Buch, Robert-Roessle-Str. 10, 13125, Berlin, Germany
| | - Hassen Bel Abed
- Departments of Chemical Biology and Structural Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Campus Berlin-Buch, Robert-Roessle-Str. 10, 13125, Berlin, Germany
| | - Peter Schmieder
- Departments of Chemical Biology and Structural Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Campus Berlin-Buch, Robert-Roessle-Str. 10, 13125, Berlin, Germany
| | - Mathias Christmann
- Institut für Chemie und Biochemie, Organische Chemie, Freie Universität Berlin, Takustrasse. 3, 14195, Berlin, Germany
| | - Marc Nazaré
- Departments of Chemical Biology and Structural Biology, Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Campus Berlin-Buch, Robert-Roessle-Str. 10, 13125, Berlin, Germany.,Berlin Institute of Health (BIH), Anna-Louisa-Karsch-Str. 2, 10178 Kapelle-Ufer 2, 10117, Berlin, Germany
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27
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Abstract
An efficient reagent system, Ph3P/XCH2CH2X (X = Cl, Br, or I), was very effective for the deoxygenative halogenation (including fluorination) of alcohols (including tertiary alcohols) and aldehydes. The easily available 1,2-dihaloethanes were used as key reagents and halogen sources. The use of (EtO)3P instead of Ph3P could also realize deoxy-halogenation, allowing for a convenient purification process, as the byproduct (EtO)3P═O could be removed by aqueous washing. The mild reaction conditions, wide substrate scope, and wide availability of 1,2-dihaloethanes make this protocol attractive for the synthesis of halogenated compounds.
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Affiliation(s)
- Jia Chen
- Key Laboratory of Organofluorine Chemistry , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Jin-Hong Lin
- Key Laboratory of Organofluorine Chemistry , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Ji-Chang Xiao
- Key Laboratory of Organofluorine Chemistry , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
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28
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Cleveland AH, Fronczek FR, Kartika R. Synthesis of Vicinal Dichlorides via Activation of Aliphatic Terminal Epoxides with Triphosgene and Pyridine. J Org Chem 2018; 83:3367-3377. [PMID: 29465239 DOI: 10.1021/acs.joc.7b03197] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Herein we report a novel synthetic reaction to convert unactivated terminal aliphatic epoxide to alkyl vicinal dichloride based on triphosgene-pyridine activation. Our methodology is operationally simple and readily tolerated by a broad of scope of substrates as well as protecting groups. Furthermore, these mild conditions generally yield clean reaction mixtures that are free of byproducts upon aqueous workup.
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Affiliation(s)
- Alexander H Cleveland
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Frank R Fronczek
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Rendy Kartika
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
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29
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Zhang K, Cai L, Yang Z, Houk KN, Kwon O. Bridged [2.2.1] bicyclic phosphine oxide facilitates catalytic γ-umpolung addition-Wittig olefination. Chem Sci 2018; 9:1867-1872. [PMID: 29732112 PMCID: PMC5909331 DOI: 10.1039/c7sc04381c] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/02/2018] [Indexed: 12/13/2022] Open
Abstract
A novel bridged [2.2.1] bicyclic phosphine oxide, devised to circumvent the waste generation and burdens of purification that are typical of reactions driven by the generation of phosphine oxides, has been prepared in three steps from commercially available cyclopent-3-ene-1-carboxylic acid. The performance of this novel phosphine oxide was superior to those of current best-in-class counterparts, as verified experimentally through kinetic analysis of its silane-mediated reduction. It has been applied successfully in halide-/base-free catalytic γ-umpolung addition-Wittig olefinations of allenoates and 2-amidobenzaldehydes to produce 1,2-dihydroquinolines with good efficiency. One of the 1,2-dihydroquinoline products was converted to known antitubercular furanoquinolines.
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Affiliation(s)
- Kui Zhang
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , USA .
| | - Lingchao Cai
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , USA .
| | - Zhongyue Yang
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , USA .
| | - K N Houk
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , USA .
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry , University of California , Los Angeles , California 90095-1569 , USA .
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30
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Nykaza TV, Ramirez A, Harrison TS, Luzung MR, Radosevich AT. Biphilic Organophosphorus-Catalyzed Intramolecular C sp2-H Amination: Evidence for a Nitrenoid in Catalytic Cadogan Cyclizations. J Am Chem Soc 2018; 140:3103-3113. [PMID: 29389114 DOI: 10.1021/jacs.7b13803] [Citation(s) in RCA: 87] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A small-ring phosphacycloalkane (1,2,2,3,4,4-hexamethylphosphetane, 3) catalyzes intramolecular C-N bond forming heterocyclization of o-nitrobiaryl and -styrenyl derivatives in the presence of a hydrosilane terminal reductant. The method provides scalable access to diverse carbazole and indole compounds under operationally trivial homogeneous organocatalytic conditions, as demonstrated by 17 examples conducted on 1 g scale. In situ NMR reaction monitoring studies support a mechanism involving catalytic PIII/PV═O cycling, where tricoordinate phosphorus compound 3 represents the catalytic resting state. For the catalytic conversion of o-nitrobiphenyl to carbazole, the kinetic reaction order was determined for phosphetane catalyst 3 (first order), substrate (first order), and phenylsilane (zeroth order). For differentially 5-substituted 2-nitrobiphenyls, the transformation is accelerated by electron-withdrawing substituents (Hammett factor ρ = +1.5), consistent with the accrual of negative charge on the nitro substrate in the rate-determining step. DFT modeling of the turnover-limiting deoxygenation event implicates a rate-determining (3 + 1) cheletropic addition between the phosphetane catalyst 3 and 2-nitrobiphenyl substrate to form an unobserved pentacoordinate spiro-bicyclic dioxazaphosphetane, which decomposes via (2 + 2) cycloreversion giving 1 equiv of phosphetane P-oxide 3·[O] and 2-nitrosobiphenyl. Experimental and computational investigations into the C-N bond forming event suggest the involvement of an oxazaphosphirane (2 + 1) adduct between 3 and 2-nitrosobiphenyl, which evolves through loss of phosphetane P-oxide 3·[O] to give the observed carbazole product via C-H insertion in a nitrene-like fashion.
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Affiliation(s)
- Trevor V Nykaza
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Antonio Ramirez
- Chemical and Synthetic Development, Bristol-Myers Squibb Company , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Tyler S Harrison
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Michael R Luzung
- Chemical and Synthetic Development, Bristol-Myers Squibb Company , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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31
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Jia M, Jiang L, Niu F, Zhang Y, Sun X. A novel and highly efficient esterification process using triphenylphosphine oxide with oxalyl chloride. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171988. [PMID: 29515897 PMCID: PMC5830786 DOI: 10.1098/rsos.171988] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 01/16/2018] [Indexed: 06/10/2023]
Abstract
Triphenylphosphine oxide (TPPO) and oxalyl chloride ((COCl)2) are used as novel and high-efficiency coupling reagents for the esterification of alcohols with carboxylic acids via the TPPO/(COCl)2 system at room temperature for 1 h. The reaction represents the first TPPO-promoted esterification under mild and neutral conditions with excellent yields. Furthermore, we proposed a plausible mechanism with the help of 31P NMR spectroscopy.
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Affiliation(s)
| | | | | | | | - Xiaoling Sun
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, 201418, Shanghai, People's Republic of China
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32
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Shipilovskikh SA, Vaganov VY, Denisova EI, Rubtsov AE, Malkov AV. Dehydration of Amides to Nitriles under Conditions of a Catalytic Appel Reaction. Org Lett 2018; 20:728-731. [DOI: 10.1021/acs.orglett.7b03862] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Vladimir Yu. Vaganov
- Department
of Chemistry, Perm State University, Bukireva 15, Perm 614990, Russia
| | - Elena I. Denisova
- Department
of Chemistry, Perm State University, Bukireva 15, Perm 614990, Russia
| | - Aleksandr E. Rubtsov
- Department
of Chemistry, Perm State University, Bukireva 15, Perm 614990, Russia
| | - Andrei V. Malkov
- Department
of Chemistry, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K
- Department
of Organic Chemistry, RUDN University, 6 Miklukho-Maklaya Street, Moscow 117198, Russia
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33
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Nikitin K, Müller-Bunz H, Muldoon J, Gilheany DG. Mysterious Decomposition of Alkoxyphosphonium Chlorides: Postulated Involvement of the HCl2Anion and Its Capture in the Solid State. Chemistry 2017; 23:4794-4802. [DOI: 10.1002/chem.201604898] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Kirill Nikitin
- School of Chemistry, Centre for Synthesis and Chemical Biology; University College Dublin; Ireland
| | - Helge Müller-Bunz
- School of Chemistry, Centre for Synthesis and Chemical Biology; University College Dublin; Ireland
| | - Jimmy Muldoon
- School of Chemistry, Centre for Synthesis and Chemical Biology; University College Dublin; Ireland
| | - Declan G. Gilheany
- School of Chemistry, Centre for Synthesis and Chemical Biology; University College Dublin; Ireland
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34
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Jiang L, Yu J, Niu F, Zhang D, Sun X. A high-efficient method for the amidation of carboxylic acids promoted by triphenylphosphine oxide and oxalyl chloride. HETEROATOM CHEMISTRY 2017. [DOI: 10.1002/hc.21364] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Lixue Jiang
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai China
| | - Jing Yu
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai China
| | - Fanfan Niu
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai China
| | - Derundong Zhang
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai China
| | - Xiaoling Sun
- School of Chemical and Environmental Engineering; Shanghai Institute of Technology; Shanghai China
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35
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Biagiotti G, Langè V, Ligi C, Caporali S, Muniz-Miranda M, Flis A, Pietrusiewicz KM, Ghini G, Brandi A, Cicchi S. Nanostructured carbon materials decorated with organophosphorus moieties: synthesis and application. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:485-493. [PMID: 28326239 PMCID: PMC5331327 DOI: 10.3762/bjnano.8.52] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 02/02/2017] [Indexed: 05/03/2023]
Abstract
A new synthetic approach for the production of carbon nanomaterials (CNM) decorated with organophosphorus moieties is presented. Three different triphenylphosphine oxide (TPPO) derivatives were used to decorate oxidized multiwalled carbon nanotubes (ox-MWCNTs) and graphene platelets (GPs). The TPPOs chosen bear functional groups able to react with the CNMs by Tour reaction (an amino group), nitrene cycloaddition (an azido group) or CuAAC reaction (one terminal C-C triple bond). All the adducts were characterized by FTIR, Raman spectroscopy, TEM, XPS, elemental analysis and ICP-AES. The cycloaddition of nitrene provided the higher loading on ox-MWCNTs and GPs as well, while the Tour approach gave best results with nanotubes (CNTs). Finally, we investigated the possibility to reduce the TPPO functionalized CNMs to the corresponding phosphine derivatives and applied one of the materials produced as heterogeneous organocatalyst in a Staudinger ligation reaction.
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Affiliation(s)
- Giacomo Biagiotti
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
| | - Vittoria Langè
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
| | - Cristina Ligi
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
| | - Stefano Caporali
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia di Materiali INSTM, 50123 Firenze, Italy
- Istituto dei Sistemi Complessi Consiglio Nazionale delle Ricerche, 50019 Sesto Fiorentino, Italy
| | - Maurizio Muniz-Miranda
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
| | - Anna Flis
- Department of Organic Chemistry Maria Curie-Skłodowska University, ul. Gliniana 33, 20-614 Lublin, Poland
| | - K Michał Pietrusiewicz
- Department of Organic Chemistry Maria Curie-Skłodowska University, ul. Gliniana 33, 20-614 Lublin, Poland
| | - Giacomo Ghini
- Nanesa S.r.l. Via Setteponti 143 - 1, 52100 Arezzo, Italy
| | - Alberto Brandi
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
| | - Stefano Cicchi
- Dipartimento di Chimica Ugo Schiff Università di Firenze, Via della Lastruccia 3–13, 50019 Sesto Fiorentino, Italy
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36
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Saska J, Lewis W, Paton RS, Denton RM. Synthesis of malhamensilipin A exploiting iterative epoxidation/chlorination: experimental and computational analysis of epoxide-derived chloronium ions. Chem Sci 2016; 7:7040-7049. [PMID: 28337338 PMCID: PMC5282550 DOI: 10.1039/c6sc03012b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 08/02/2016] [Indexed: 11/21/2022] Open
Abstract
We report a 12-step catalytic enantioselective formal synthesis of malhamensilipin A (3) based upon an iterative epoxidation/chlorination strategy.
We report a 12-step catalytic enantioselective formal synthesis of malhamensilipin A (3) and diastereoisomeric analogues from (E)-2-undecenal. The convergent synthesis relied upon iterative epoxidation and phosphorus(v)-mediated deoxydichlorination reactions as well a titanium-mediated epoxide-opening to construct the C11–C16 stereohexad. The latter transformation occurred with very high levels of stereoretention regardless of the C13 configuration of the parent epoxide, implicating anchimeric assistance of either the γ- or δ-chlorine atoms, and the formation of chloretanium or chlorolanium ions, respectively. A computational analysis of the chloronium ion intermediates provided support for the involvement of chlorolanium ions, whereas the potential chloretanium ions were found to be less likely intermediates on the basis of their greater carbocationic character.
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Affiliation(s)
- J Saska
- School of Chemistry , University Park , Nottingham , NG7 2RD , UK .
| | - W Lewis
- School of Chemistry , University Park , Nottingham , NG7 2RD , UK .
| | - R S Paton
- Chemistry Research Laboratory , 12 Mansfield Road , Oxford OX1 3TA , UK .
| | - R M Denton
- School of Chemistry , University Park , Nottingham , NG7 2RD , UK .
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37
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Wang L, Xie YB, Huang NY, Yan JY, Hu WM, Liu MG, Ding MW. Catalytic aza-Wittig Reaction of Acid Anhydride for the Synthesis of 4H-Benzo[d][1,3]oxazin-4-ones and 4-Benzylidene-2-aryloxazol-5(4H)-ones. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00165] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Long Wang
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
- Hubei Key Laboratory
of Natural Products Research and Development, China Three Gorges University, Yichang, Hubei 443002, China
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan, Hubei 430079, China
| | - Yi-Bi Xie
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
| | - Nian-Yu Huang
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
- Hubei Key Laboratory
of Natural Products Research and Development, China Three Gorges University, Yichang, Hubei 443002, China
| | - Jia-Ying Yan
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
| | - Wei-Min Hu
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
| | - Ming-Guo Liu
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
- Hubei Key Laboratory
of Natural Products Research and Development, China Three Gorges University, Yichang, Hubei 443002, China
| | - Ming-Wu Ding
- College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan, Hubei 430079, China
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38
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Chung WJ, Vanderwal CD. Stereoselective Halogenation in Natural Product Synthesis. Angew Chem Int Ed Engl 2016; 55:4396-434. [PMID: 26833878 PMCID: PMC6028003 DOI: 10.1002/anie.201506388] [Citation(s) in RCA: 196] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 08/27/2015] [Indexed: 01/23/2023]
Abstract
At last count, nearly 5000 halogenated natural products have been discovered. In approximately half of these compounds, the carbon atom to which the halogen is bound is sp(3) -hybridized; therefore, there are an enormous number of natural products for which stereocontrolled halogenation must be a critical component of any synthesis strategy. In this Review, we critically discuss the methods and strategies used for stereoselective introduction of halogen atoms in the context of natural product synthesis. Using the successes of the past, we also attempt to identify gaps in our synthesis technology that would aid the synthesis of halogenated natural products, as well as existing methods that have not yet seen application in complex molecule synthesis. The chemistry described herein demonstrates yet again how natural products continue to provide the inspiration for critical advances in chemical synthesis.
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Affiliation(s)
- Won-jin Chung
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, South Korea.
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39
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Chung WJ, Vanderwal CD. Stereoselektive Halogenierungen in der Naturstoffsynthese. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201506388] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Won-jin Chung
- Department of Chemistry; Gwangju Institute of Science and Technology; Gwangju Südkorea
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40
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Zeng X, Gong C, Zhang J, Xie J. A simple and highly diasteroselective approach for the vicinal dichlorination of functional olefins. RSC Adv 2016. [DOI: 10.1039/c6ra20101f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient strategy for triphenylphosphine oxide-catalyzed vicinal dichlorination of functional olefins was developed using sulfuryl chloride as the source of chloride.
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Affiliation(s)
- Xianghua Zeng
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Chunhua Gong
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Junyong Zhang
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Jingli Xie
- College of Biological
- Chemical Sciences and Engineering
- Jiaxing University
- Jiaxing 314001
- China
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41
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Bel Abed H, Mammoliti O, Bande O, Van Lommen G, Herdewijn P. Organophosphorus-catalyzed diaza-Wittig reaction: application to the synthesis of pyridazines. Org Biomol Chem 2015; 12:7159-66. [PMID: 25101802 DOI: 10.1039/c4ob01201a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The elaboration of the first organophosphorus-catalyzed diaza-Wittig reaction is reported. This catalytic reaction is applied to the synthesis of substituted pyridazine and phthalazine derivatives bearing electron-withdrawing groups with good to excellent yields from substrates containing a diazo functionality as the starting material and a phospholene oxide as the catalyst.
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Affiliation(s)
- Hassen Bel Abed
- Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroedersstraat 10, B-3000 Leuven, Belgium.
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42
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43
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Catalytic, stereospecific syn-dichlorination of alkenes. Nat Chem 2015; 7:146-52. [PMID: 25615668 DOI: 10.1038/nchem.2141] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/18/2014] [Indexed: 11/08/2022]
Abstract
As some of the oldest organic chemical reactions known, the ionic additions of elemental halogens such as bromine and chlorine to alkenes are prototypical examples of stereospecific reactions, typically delivering vicinal dihalides resulting from anti-addition. Although the invention of enantioselective variants is an ongoing challenge, the ability to overturn the intrinsic anti-diastereospecificity of these transformations is also a largely unsolved problem. Here, we describe the first catalytic, syn-stereospecific dichlorination of alkenes, employing a group transfer catalyst based on a redox-active main group element (selenium). With diphenyl diselenide (PhSeSePh) (5 mol%) as the pre-catalyst, benzyltriethylammonium chloride (BnEt3NCl) as the chloride source and an N-fluoropyridinium salt as the oxidant, a wide variety of functionalized cyclic and acyclic 1,2-disubstituted alkenes, including simple allylic alcohols, deliver syn-dichlorides with exquisite stereocontrol. This methodology is expected to find applications in streamlining the synthesis of polychlorinated natural products such as the chlorosulfolipids.
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44
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Jennings EV, Nikitin K, Ortin Y, Gilheany DG. Degenerate Nucleophilic Substitution in Phosphonium Salts. J Am Chem Soc 2014; 136:16217-26. [DOI: 10.1021/ja507433g] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Elizabeth V. Jennings
- Centre for Synthesis and
Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Dublin 4, Ireland
| | - Kirill Nikitin
- Centre for Synthesis and
Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Dublin 4, Ireland
| | - Yannick Ortin
- Centre for Synthesis and
Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Dublin 4, Ireland
| | - Declan G. Gilheany
- Centre for Synthesis and
Chemical Biology, School of Chemistry and Chemical Biology, University College Dublin, Dublin 4, Ireland
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45
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Somai Magar KB, Lee YR. Ruthenium(II)-Catalyzed Protocol for Preparation of Diverse α,β- and β,β-Dihaloenones from Diazodicarbonyls. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400348] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Xia X, Toy PH. Rasta resin-triphenylphosphine oxides and their use as recyclable heterogeneous reagent precursors in halogenation reactions. Beilstein J Org Chem 2014; 10:1397-405. [PMID: 24991294 PMCID: PMC4077539 DOI: 10.3762/bjoc.10.143] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 05/18/2014] [Indexed: 11/23/2022] Open
Abstract
Heterogeneous polymer-supported triphenylphosphine oxides based on the rasta resin architecture have been synthesized, and applied as reagent precursors in a wide range of halogenation reactions. The rasta resin–triphenylphosphine oxides were reacted with either oxalyl chloride or oxalyl bromide to form the corresponding halophosphonium salts, and these in turn were reacted with alcohols, aldehydes, aziridines and epoxides to form halogenated products in high yields after simple purification. The polymer-supported triphenylphosphine oxides formed as a byproduct during these reactions could be recovered and reused numerous times with no appreciable decrease in reactivity.
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Affiliation(s)
- Xuanshu Xia
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Patrick H Toy
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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47
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Umezawa T, Matsuda F. Recent progress toward synthesis of chlorosulfolipids: total synthesis and methodology. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.03.082] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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48
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Cui XM, Guan YH, Li N, Lv H, Fu LA, Guo K, Fan X. A mild and efficient method for bromination of alcohols using α,α-dibromo-β-dicarbonyl compounds as halogen sources. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.10.120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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Tang X, An J, Denton RM. A procedure for Appel halogenations and dehydrations using a polystyrene supported phosphine oxide. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.11.098] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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50
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Tang X, Chapman C, Whiting M, Denton R. Development of a redox-free Mitsunobu reaction exploiting phosphine oxides as precursors to dioxyphosphoranes. Chem Commun (Camb) 2014; 50:7340-3. [DOI: 10.1039/c4cc02171a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The development of a redox-free protocol for Mitsunobu inversion is described.
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Affiliation(s)
- Xiaoping Tang
- School of Chemistry
- University Park
- University of Nottingham
- Nottingham, UK
| | - Charlotte Chapman
- School of Chemistry
- University Park
- University of Nottingham
- Nottingham, UK
| | | | - Ross Denton
- School of Chemistry
- University Park
- University of Nottingham
- Nottingham, UK
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