1
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Tran MK, Ready JM. Chemoselective and Stereoselective Allylation of Bis(alkenyl)boronates. Angew Chem Int Ed Engl 2024; 63:e202407824. [PMID: 38781007 PMCID: PMC11347121 DOI: 10.1002/anie.202407824] [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: 04/24/2024] [Revised: 05/21/2024] [Accepted: 05/23/2024] [Indexed: 05/25/2024]
Abstract
Bis(alkenyl)boronates react with optically active Ir(π-allyl) species in a process that involves allylation of the more substituted olefin and 1,2-metalate shift of the less substituted olefin. The method constructs valuable enantioenriched tertiary allylic boronic esters with high chemoselectivity, enantioselectivity and diastereoselectivity. Allylic functionalization reactions transform the 1,3-stereodiad to 1,5- and 1,6-stereochemical relationships.
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Affiliation(s)
- Minh-Khoa Tran
- Department of Biochemistry, Division of Chemistry, UT Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, TX 75390-0938 (USA)
| | - Joseph M. Ready
- Department of Biochemistry, Division of Chemistry, UT Southwestern Medical Center 5323 Harry Hines Blvd., Dallas, TX 75390-0938 (USA)
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2
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Linne E, Kalesse M. Stereoselective Construction of β-chiral Homoallyl Functionalities by Substrate- and Reagent-Controlled Iterative 1,2-Metallate Rearrangements. Org Lett 2023; 25:8210-8214. [PMID: 37943683 PMCID: PMC10683368 DOI: 10.1021/acs.orglett.3c02935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 10/24/2023] [Accepted: 10/30/2023] [Indexed: 11/12/2023]
Abstract
Homoallylic alcohols possessing chiral β-centers are considered highly valuable in the synthesis of polyketide-based natural products. Therefore, there is a significant demand for new methods that allow for their stereoselective access. In pursuit of this objective, we have successfully combined our substrate-controlled protocol of Hoppe-Matteson-Aggarwal chemistry with iterative 1,2-metallate rearrangements. Notably, this approach has proven effective in introducing not only primary alcohols but also other functional groups such as alkynes and protected amines.
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Affiliation(s)
- Elvira Linne
- Institute
of Organic Chemistry (OCI), Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Markus Kalesse
- Institute
of Organic Chemistry (OCI), Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
- Centre
of Biomolecular Drug Research (BMWZ), Gottfried
Wilhelm Leibniz Universität Hannover, 30167 Hannover, Germany
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3
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Manna S, Paul S, Kong WY, Aich D, Sahoo R, Tantillo DJ, Panda S. Stereodivergent Zweifel Olefination and its Mechanistic Dichotomy. Angew Chem Int Ed Engl 2023; 62:e202309136. [PMID: 37495925 DOI: 10.1002/anie.202309136] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/24/2023] [Accepted: 07/26/2023] [Indexed: 07/28/2023]
Abstract
Stereoselective Zweifel olefination using boronate complexes carrying two different reactive π-systems was achieved to synthesize vinyl heteroarenes and conjugated 1,3-dienes in good yield and up to 100 % stereoselectivity, which remains unexplored until now. Most importantly, we report the unprecedented formation of E vs. Z-vinyl heteroarenes for different heteroarenes under identical conditions. Density functional theory (DFT) investigations unveil the mechanistic dichotomy between olefin and heteroarene activation followed by 1,2-migration, leading to E or Z-vinyl heteroarenes respectively. We also report a previously unknown reversal of stereoselectivity by using 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) as an electrophile. The Zweifel olefination using a boronate complex that carries two different olefins was previously unexplored due to significant challenges associated with the site-selective activation of olefins. We have solved this problem and reported the site-selective activation of olefins for the stereoselective synthesis of 1,3-dienes.
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Affiliation(s)
- Samir Manna
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Swagata Paul
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Wang-Yeuk Kong
- Department of Chemistry, University of California, Davis, CA 95616, USA
| | - Debasis Aich
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Rupam Sahoo
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
| | - Dean J Tantillo
- Department of Chemistry, University of California, Davis, CA 95616, USA
| | - Santanu Panda
- Department of Chemistry, Indian Institute of Technology, Kharagpur, West Bengal, India
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4
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Iterative synthesis of 1,3-polyboronic esters with high stereocontrol and application to the synthesis of bahamaolide A. Nat Chem 2023; 15:248-256. [PMID: 36424454 DOI: 10.1038/s41557-022-01087-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 10/07/2022] [Indexed: 11/26/2022]
Abstract
Polyketide natural products often contain common repeat motifs, for example, propionate, acetate and deoxypropionate, and so can be synthesized by iterative processes. We report here a highly efficient iterative strategy for the synthesis of polyacetates based on boronic ester homologation that does not require functional group manipulation between iterations. This process involves sequential asymmetric diboration of a terminal alkene, forming a 1,2-bis(boronic ester), followed by regio- and stereoselective homologation of the primary boronic ester with a butenyl metallated carbenoid to generate a 1,3-bis(boronic ester). Each transformation independently controls the stereochemical configuration, making the process highly versatile, and the sequence can be iterated prior to stereospecific oxidation of the 1,3-polyboronic ester to yield the 1,3-polyol. This methodology has been applied to a 14-step synthesis of the oxopolyene macrolide bahamaolide A, and the versatility of the 1,3-polyboronic esters has been demonstrated in various stereospecific transformations, leading to polyalkenes, -alkynes, -ketones and -aromatics with full stereocontrol.
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5
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McDonald TR, Rousseaux SAL. Synthesis of 3-borylated cyclobutanols from epihalohydrins or epoxy alcohol derivatives. Chem Sci 2023; 14:963-969. [PMID: 36755731 PMCID: PMC9890513 DOI: 10.1039/d2sc06088d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022] Open
Abstract
There is an increasing interest in cyclobutanes within the medicinal chemistry community. Therefore, methods to prepare cyclobutanes that contain synthetic handles for further elaboration are of interest. Herein, we report a new approach for the synthesis of 3-borylated cyclobutanols via a formal [3 + 1]-cycloaddition using readily accessible 1,1-diborylalkanes and epihalohydrins or epoxy alcohol derivatives. 1-Substituted epibromohydrin starting materials provide access to borylated cyclobutanols containing substituents at three of the four positions on the cyclobutane core, and enantioenriched epibromohydrins lead to enantioenriched cyclobutanols with high levels of enantiospecificity (>98%). Finally, derivatization studies demonstrate the synthetic utility of both the OH and Bpin handles.
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Affiliation(s)
- Tyler R. McDonald
- Department of Chemistry, University of Toronto. 80 St. George StreetTorontoONCanada
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6
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Li M, Peng GR, Yang X, Ma ZN, Xie JB. Enantio- and diastereoselective boron conjugate addition to α-alkyl α,β-unsaturated esters. Org Biomol Chem 2022; 21:53-58. [PMID: 36468637 DOI: 10.1039/d2ob01928k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
We developed a copper-catalyzed enantio- and diastereoselective boron conjugate addition to α-alkyl α,β-unsaturated esters under base-free conditions. The approach showed excellent enantioselectivities (87-99% ee) and moderate to good conversions (51-99%), albeit with moderate diastereoselectivities (1 : 1-17 : 1 dr). The synthetic utility of this protocol was demonstrated.
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Affiliation(s)
- Meng Li
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Guang-Rui Peng
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Xuan Yang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Zhen-Ning Ma
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
| | - Jian-Bo Xie
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, Yangling 712100, China.
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7
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Pavlíčková T, Stöckl Y, Marek I. Synthesis and Functionalization of Tertiary Propargylic Boronic Esters by Alkynyllithium-Mediated 1,2-Metalate Rearrangement of Borylated Cyclopropanes. Org Lett 2022; 24:8901-8906. [PMID: 36446049 PMCID: PMC9791689 DOI: 10.1021/acs.orglett.2c03756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Implementing the use of alkynyllithium reagents in a stereospecific 1,2-metalate rearrangement-mediated ring opening of polysubstituted cyclopropyl boronic esters provides a variety of tertiary pinacol boranes bearing adjacent tertiary or quaternary carbon stereocenters with high levels of diastereomeric purity. The potential of this strategy was demonstrated through a selection of α- and γ-functionalization of the propargyl boronic esters.
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8
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Li Y, Paola E, Wang Z, Menard G, Zakarian A. Lithium Enolate with a Lithium-Alkyne Interaction in the Enantioselective Construction of Quaternary Carbon Centers: Concise Synthesis of (+)-Goniomitine. Angew Chem Int Ed Engl 2022; 61:e202209987. [PMID: 36251869 PMCID: PMC9798608 DOI: 10.1002/anie.202209987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Indexed: 11/09/2022]
Abstract
We report a method for direct enantioselective alkylation of 3-alkynoic and 2,3-alkendioic acids that form quaternary stereogenic centers, and application of this method to the total enantioselective synthesis of a complex alkaloid (+)-goniomitine. The methods were effective in the alkylation of both 3-alkynoic acids, 2,3-alkendioic acids substrates with a broad range of heterocyclic and functionalized alkyl group substituents. Accompanying crystallographic studies provide mechanistic insight into the structure of well-defined chiral aggregates, highlighting cation-π interactions between lithium and alkyne groups.
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Affiliation(s)
- Yang Li
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Elena Paola
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Zongheng Wang
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Gabriel Menard
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Armen Zakarian
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
- Center for Integrative Biology, Faculty of Sciences, Geroscience Center for Brain Health and Metabolism, Universidad Mayor, Santiago, Chile
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9
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Li Y, Paola E, Wang Z, Menard G, Zakarian A. Lithium Enolate with a Lithium‐Alkyne Interaction in the Enantioselective Construction of Quaternary Carbon Centers: Concise Synthesis of (+)‐Goniomitine. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yang Li
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Elena Paola
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Zongheng Wang
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Gabriel Menard
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
| | - Armen Zakarian
- Department of Chemistry and Biochemistry University of California Santa Barbara CA 93106 USA
- Center for Integrative Biology Faculty of Sciences Geroscience Center for Brain Health and Metabolism Universidad Mayor Santiago Chile
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10
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Xu J, He Z, Zhang J, Chen J, Huang Y. A Thioether‐Catalyzed Cross‐Coupling Reaction of Allyl Halides and Arylboronic Acids. Angew Chem Int Ed Engl 2022; 61:e202211408. [DOI: 10.1002/anie.202211408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Jingwei Xu
- State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen 518055 China
- Pingshan Translational Medicine Center Shenzhen Bay Laboratory Shenzhen 518118 China
| | - Zhiqi He
- State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Jiwei Zhang
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong SAR China
| | - Jiean Chen
- Pingshan Translational Medicine Center Shenzhen Bay Laboratory Shenzhen 518118 China
| | - Yong Huang
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay, Kowloon Hong Kong SAR China
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11
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Xu J, He Z, Zhang J, Chen J, Huang Y. A Thioether‐Catalyzed Cross‐Coupling Reaction of Allyl Halides and Arylboronic Acids. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202211408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jingwei Xu
- Peking University Shenzhen Graduate School School of Chemical Biology and Biotechnology CHINA
| | - Zhiqi He
- Peking University Shenzhen Graduate School School of Chemical Biology and Biotechnology CHINA
| | - Jiwei Zhang
- Hong Kong University of Science and Technology School of Science Department of Chemistry HONG KONG
| | - Jiean Chen
- SZBL: Shenzhen Bay Laboratory Pingshan Translational Medicine Center CHINA
| | - Yong Huang
- The Hong Kong University of Science and Technology Chemistry Clear Water Bay 00000 Hong Kong HONG KONG
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12
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Duan S, Zi Y, Wang L, Cong J, Chen W, Li M, Zhang H, Yang X, Walsh PJ. α-Branched amines through radical coupling with 2-azaallyl anions, redox active esters and alkenes. Chem Sci 2022; 13:3740-3747. [PMID: 35432903 PMCID: PMC8966660 DOI: 10.1039/d2sc00500j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 03/03/2022] [Indexed: 11/21/2022] Open
Abstract
α-Branched amines are fundamental building blocks in a variety of natural products and pharmaceuticals. Herein is reported a unique cascade reaction that enables the preparation of α-branched amines bearing aryl or alkyl groups at the β- or γ-positions. The cascade is initiated by reduction of redox active esters to alkyl radicals. The resulting alkyl radicals are trapped by styrene derivatives, leading to benzylic radicals. The persistent 2-azaallyl radicals and benzylic radicals are proposed to undergo a radical-radical coupling leading to functionalized amine products. Evidence is provided that the role of the nickel catalyst is to promote formation of the alkyl radical from the redox active ester and not promote the C-C bond formation. The synthetic method introduced herein tolerates a variety of imines and redox active esters, allowing for efficient construction of amine building blocks.
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Affiliation(s)
- Shengzu Duan
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Yujin Zi
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Lingling Wang
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Jielun Cong
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Wen Chen
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Minyan Li
- Roy and Diana Vagelos Laboratories Penn/Merck Laboratory for High-Throughput Experimentation Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia PA USA
| | - Hongbin Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Xiaodong Yang
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education, Yunnan Province Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories Penn/Merck Laboratory for High-Throughput Experimentation Department of Chemistry, University of Pennsylvania 231 South 34th Street Philadelphia PA USA
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13
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Sharma HA, Essman JZ, Jacobsen EN. Enantioselective catalytic 1,2-boronate rearrangements. Science 2021; 374:752-757. [PMID: 34735250 DOI: 10.1126/science.abm0386] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Hayden A Sharma
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Jake Z Essman
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
| | - Eric N Jacobsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA
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14
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Mykura RC, Songara P, Luc E, Rogers J, Stammers E, Aggarwal VK. Studies on the Lithiation, Borylation, and 1,2‐Metalate Rearrangement of
O
‐Cycloalkyl 2,4,6‐Triisopropylbenzoates. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101374] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Rory C. Mykura
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Pradip Songara
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Eugenia Luc
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Jack Rogers
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Ellie Stammers
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Varinder K. Aggarwal
- Department of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
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15
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Sun S, Talavera L, Spieß P, Day CS, Martin R. sp
3
Bis
‐Organometallic Reagents via Catalytic 1,1‐Difunctionalization of Unactivated Olefins. Angew Chem Int Ed Engl 2021; 60:11740-11744. [DOI: 10.1002/anie.202100810] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Indexed: 12/26/2022]
Affiliation(s)
- Shang‐Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Laura Talavera
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Philipp Spieß
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
| | - Craig S. Day
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA) Passeig Lluïs Companys, 23 08010 Barcelona Spain
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16
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Sun S, Talavera L, Spieß P, Day CS, Martin R. sp
3
Bis
‐Organometallic Reagents via Catalytic 1,1‐Difunctionalization of Unactivated Olefins. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100810] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Shang‐Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Laura Talavera
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Philipp Spieß
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
| | - Craig S. Day
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i Virgili Departament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ) The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA) Passeig Lluïs Companys, 23 08010 Barcelona Spain
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17
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Mykura RC, Songara P, Luc E, Rogers J, Stammers E, Aggarwal VK. Studies on the Lithiation, Borylation, and 1,2-Metalate Rearrangement of O-Cycloalkyl 2,4,6-Triisopropylbenzoates. Angew Chem Int Ed Engl 2021; 60:11436-11441. [PMID: 33651488 PMCID: PMC8251992 DOI: 10.1002/anie.202101374] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Indexed: 12/29/2022]
Abstract
A broad range of acyclic primary and secondary 2,4,6‐triisopropylbenzoate (TIB) esters have been used in lithiation‐borylation reactions, but cyclic TIB esters have not. We have studied the use of cyclic TIB esters in lithiation‐borylation reactions and looked at the effect of ring size (3‐ → 6‐membered rings) on the three key steps of the lithiation‐borylation protocol: deprotonation, borylation and 1,2‐metalate rearrangement. Although all rings sizes could be deprotonated, the cyclohexyl case was impractically slow, and the cyclopentyl example underwent α‐elimination faster than deprotonation at −78 °C and so could not be used. Both cyclobutyl and cyclopropyl cases underwent rapid borylation, but only the cyclobutyl substrate underwent 1,2‐metalate rearrangement. Thus, the cyclobutyl TIB ester occupies a “Goldilocks zone,” being small enough for deprotonation and large enough to enable 1,2‐migration. The generality of the reaction was explored with a broad range of boronic esters.
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Affiliation(s)
- Rory C Mykura
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Pradip Songara
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Eugenia Luc
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Jack Rogers
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Ellie Stammers
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Varinder K Aggarwal
- Department of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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18
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Guo L, Noble A, Aggarwal VK. α‐Selective Ring‐Opening Reactions of Bicyclo[1.1.0]butyl Boronic Ester with Nucleophiles. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202011739] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lin Guo
- Bristol University Department of Chemistry Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- Bristol University Department of Chemistry Cantock's Close Bristol BS8 1TS UK
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19
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Yang Y, Tsien J, Ben David A, Hughes JME, Merchant RR, Qin T. Practical and Modular Construction of C(sp 3)-Rich Alkyl Boron Compounds. J Am Chem Soc 2020; 143:471-480. [PMID: 33347297 DOI: 10.1021/jacs.0c11964] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Alkyl boronic acids and esters play an important role in the synthesis of C(sp3)-rich medicines, agrochemicals, and material chemistry. This work describes a new type of transition-metal-free mediated transformation to enable the construction of C(sp3)-rich and sterically hindered alkyl boron reagents in a practical and modular manner. The broad generality and functional group tolerance of this method is extensively examined through a variety of substrates, including synthesis and late-stage functionalization of scaffolds relevant to medicinal chemistry. The strategic significance of this approach, with alkyl boronic acids as linchpins, is demonstrated through various downstream functionalizations of the alkyl boron compounds. This two-step concurrent cross-coupling approach, resembling formal and flexible alkyl-alkyl couplings, provides a general entry to synthetically challenging high Fsp3-containing drug-like scaffolds.
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Affiliation(s)
- Yangyang Yang
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, United States
| | - Jet Tsien
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, United States
| | - Ayala Ben David
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, United States
| | - Jonathan M E Hughes
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Rohan R Merchant
- Department of Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States
| | - Tian Qin
- Department of Biochemistry, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, United States
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20
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Guo L, Noble A, Aggarwal VK. α‐Selective Ring‐Opening Reactions of Bicyclo[1.1.0]butyl Boronic Ester with Nucleophiles. Angew Chem Int Ed Engl 2020; 60:212-216. [DOI: 10.1002/anie.202011739] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 09/17/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Lin Guo
- Bristol University Department of Chemistry Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- Bristol University Department of Chemistry Cantock's Close Bristol BS8 1TS UK
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21
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Das KK, Panda S. Functionalization of Heterocycles through 1,2‐Metallate Rearrangement of Boronate Complexes. Chemistry 2020; 26:14270-14282. [DOI: 10.1002/chem.202002573] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/14/2020] [Indexed: 01/27/2023]
Affiliation(s)
| | - Santanu Panda
- Indian Institute of Technology Kharagpur 721302 India
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22
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Wang H, Jing C, Noble A, Aggarwal VK. Stereospecific 1,2-Migrations of Boronate Complexes Induced by Electrophiles. Angew Chem Int Ed Engl 2020; 59:16859-16872. [PMID: 32592274 PMCID: PMC7540471 DOI: 10.1002/anie.202008096] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Indexed: 12/16/2022]
Abstract
The stereospecific 1,2-migration of boronate complexes is one of the most representative reactions in boron chemistry. This process has been used extensively to develop powerful methods for asymmetric synthesis, with applications spanning from pharmaceuticals to natural products. Typically, 1,2-migration of boronate complexes is driven by displacement of an α-leaving group, oxidation of an α-boryl radical, or electrophilic activation of an alkenyl boronate complex. The aim of this article is to summarize the recent advances in the rapidly expanding field of electrophile-induced stereospecific 1,2-migration of groups from boron to sp2 and sp3 carbon centers. It will be shown that three different conceptual approaches can be utilized to enable the 1,2-migration of boronate complexes: stereospecific Zweifel-type reactions, catalytic conjunctive coupling reactions, and transition metal-free sp2 -sp3 couplings. A discussion of the reaction scope, mechanistic insights, and synthetic applications of the work described is also presented.
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Affiliation(s)
- Hui Wang
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Changcheng Jing
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
| | - Adam Noble
- School of ChemistryUniversity of BristolCantock's CloseBristolBS8 1TSUK
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23
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Wang H, Jing C, Noble A, Aggarwal VK. Stereospecific 1,2‐Migrations of Boronate Complexes Induced by Electrophiles. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008096] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Hui Wang
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Changcheng Jing
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK
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24
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Shen F, Lu L, Shen Q. Electrophilic fluoroalkylthiolation induced diastereoselective and stereospecific 1,2-metalate migration of alkenylboronate complexes. Chem Sci 2020; 11:8020-8024. [PMID: 34123079 PMCID: PMC8163329 DOI: 10.1039/d0sc03039b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
A transition metal free process for conjunctive functionalization of alkenylboron ate-complexes with electrophilic fluoroalkylthiolating reagents is described, affording β-trifluoroalkylthiolated and difluoroalkylthiolated boronic esters in good yield and excellent diastereoselectivity. The potential applicability of the method was demonstrated by the preparation of a difluoromethylthiolated mimic 12 of a potential drug molecule PF-4191834 for the treatment of asthma. A transition metal free process for conjunctive functionalization of alkenylboron ate-complexes with electrophilic fluoroalkylthiolating reagents affords β-tri- and difluoroalkylthiolated boronic esters in good yield and diastereoselectivity.![]()
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Affiliation(s)
- Feng Shen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
| | - Long Lu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences China
| | - Qilong Shen
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 China
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25
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Linne Y, Schönwald A, Weißbach S, Kalesse M. Desymmetrization of C 2 -Symmetric Bis(Boronic Esters) by Zweifel Olefinations. Chemistry 2020; 26:7998-8002. [PMID: 32068298 PMCID: PMC7384159 DOI: 10.1002/chem.202000599] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Indexed: 02/05/2023]
Abstract
anti‐Configured 1,3‐dimethyl deoxypropionate motifs are important sub structures in natural products. Herein, we describe a bidirectional approach for the rapid construction of natural products featuring such motifs by using C2‐symmetrical 1,3‐bis(boronic esters). As for its application in convergent syntheses it was important to establish a selective mono‐Zweifel olefination we describe the scope and limitations by using different 1,3‐bis(boronic esters) and nucleophiles. This protocol takes advantage of the combination of the Hoppe–Matteson–Zweifel chemistry, which was elegantly put into practice by Aggarwal et al. In order to show its applicability the total syntheses of two natural products, serricornin and (+)‐invictolide, were performed.
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Affiliation(s)
- Yannick Linne
- Institute for Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany.,Centre of Biomolecular Drug Research (BMWZ), Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 38, 30167, Hannover, Germany
| | - Axel Schönwald
- Institute for Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Sebastian Weißbach
- Institute for Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany
| | - Markus Kalesse
- Institute for Organic Chemistry, Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 1B, 30167, Hannover, Germany.,Centre of Biomolecular Drug Research (BMWZ), Gottfried Wilhelm Leibniz Universität Hannover, Schneiderberg 38, 30167, Hannover, Germany.,Helmholtz Centre for Infection Research (HZI), Inhoffenstrasse 7, 38124, Braunschweig, Germany
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26
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Sun S, Duan Y, Mega RS, Somerville RJ, Martin R. Site‐Selective 1,2‐Dicarbofunctionalization of Vinyl Boronates through Dual Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916279] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Shang‐Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i VirgiliDepartament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Yaya Duan
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
| | - Riccardo S. Mega
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
| | - Rosie J. Somerville
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Universitat Rovira i VirgiliDepartament de Química Analítica i Química Orgànica c/Marcel lí Domingo, 1 43007 Tarragona Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ)The Barcelona Institute of Science and Technology Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA) Passeig Lluïs Companys, 23 08010 Barcelona Spain
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27
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Pradeilles JA, Zhong S, Baglyas M, Tarczay G, Butts CP, Myers EL, Aggarwal VK. Odd-even alternations in helical propensity of a homologous series of hydrocarbons. Nat Chem 2020; 12:475-480. [PMID: 32123339 DOI: 10.1038/s41557-020-0429-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 01/24/2020] [Indexed: 11/09/2022]
Abstract
Odd and even homologues of some n-alkane-based systems are known to exhibit notably different trends in solid-state properties; a well-known illustration is the zigzag plot of their melting point versus chain length. Odd-even effects in the solid state often arise from intermolecular interactions that involve fully extended molecules. These effects have also been observed in less condensed phases, such as self-assembled monolayers; however, the origins of these effects in such systems can be difficult to determine. Here we combined NMR and computational analysis to show that all-syn contiguously methyl-substituted hydrocarbons, with chain lengths from C6 to C11, exhibit a dramatic odd-even effect in helical propensity. The even- and odd-numbered hydrocarbons populate regular and less-controlled helical conformations, respectively. This knowledge will guide the design of helical hydrocarbons as rigid scaffolds or as hydrophobic components in soft materials.
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Affiliation(s)
| | - Siying Zhong
- School of Chemistry, University of Bristol, Bristol, UK
| | - Márton Baglyas
- Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, Budapest, Hungary.,MTA-ELTE, Lendület Laboratory Astrochemistry Research Group, Institute of Chemistry, Eötvös University, Budapest, Hungary
| | - György Tarczay
- Laboratory of Molecular Spectroscopy, Institute of Chemistry, Eötvös University, Budapest, Hungary.,MTA-ELTE, Lendület Laboratory Astrochemistry Research Group, Institute of Chemistry, Eötvös University, Budapest, Hungary
| | - Craig P Butts
- School of Chemistry, University of Bristol, Bristol, UK.
| | - Eddie L Myers
- School of Chemistry, National University of Ireland Galway, Galway, Ireland.
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28
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Sun SZ, Duan Y, Mega RS, Somerville RJ, Martin R. Site-Selective 1,2-Dicarbofunctionalization of Vinyl Boronates through Dual Catalysis. Angew Chem Int Ed Engl 2020; 59:4370-4374. [PMID: 31910307 DOI: 10.1002/anie.201916279] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/07/2020] [Indexed: 01/05/2023]
Abstract
A modular, site-selective 1,2-dicarbofunctionalization of vinyl boronates with organic halides through dual catalysis is described. This reaction proceeds under mild conditions and is characterized by excellent chemo- and regioselectivity. It thus represents a complementary new technique for preparing densely functionalized alkyl boron architectures from simple and accessible precursors.
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Affiliation(s)
- Shang-Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Universitat Rovira i Virgili, Departament de Química Analítica i Química Orgànica, c/Marcel lí Domingo, 1, 43007, Tarragona, Spain
| | - Yaya Duan
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Riccardo S Mega
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Rosie J Somerville
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Universitat Rovira i Virgili, Departament de Química Analítica i Química Orgànica, c/Marcel lí Domingo, 1, 43007, Tarragona, Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
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29
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Nandakumar M, Rubial B, Noble A, Myers EL, Aggarwal VK. Ring-Opening Lithiation-Borylation of 2-Trifluoromethyl Oxirane: A Route to Versatile Tertiary Trifluoromethyl Boronic Esters. Angew Chem Int Ed Engl 2020; 59:1187-1191. [PMID: 31710748 DOI: 10.1002/anie.201912797] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Indexed: 11/07/2022]
Abstract
Stereogenic trifluoromethyl-substituted carbon centers are highly sought-after moieties in pharmaceutical and agrochemical discovery. Here, we show that lithiation-borylation reactions of 2-trifluoromethyl oxirane give densely functionalized and highly versatile trifluoromethyl-substituted α-tertiary boronic esters. The intermediate boronate complexes undergo the desired 1,2-rearrangement of the carbon-based group with complete retentive stereospecificity, a process that was only observed in non-polar solvents in the presence of TESOTf. Although the trifluoromethyl group adversely affects subsequent transformations of the α-boryl group, Zweifel olefinations provide trifluoromethyl-bearing quaternary stereocenters substituted with alkenes, alkynes and ketones.
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Affiliation(s)
| | - Belén Rubial
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Adam Noble
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Eddie L Myers
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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30
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Nandakumar M, Rubial B, Noble A, Myers EL, Aggarwal VK. Ring‐Opening Lithiation–Borylation of 2‐Trifluoromethyl Oxirane: A Route to Versatile Tertiary Trifluoromethyl Boronic Esters. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201912797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | - Belén Rubial
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
| | - Adam Noble
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
| | - Eddie L. Myers
- School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS UK
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31
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Ji E, Meng H, Zheng Y, Ramadoss V, Wang Y. Copper-Catalyzed Stereospecific Hydroboration of Internal Allylic Alcohols. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Enhui Ji
- Institute of Advanced Synthesis (IAS); School of Chemistry and Molecular Engineering; Nanjing Tech University; 211816 Nanjing China
| | - Haiwen Meng
- Institute of Advanced Synthesis (IAS); School of Chemistry and Molecular Engineering; Nanjing Tech University; 211816 Nanjing China
| | - Yue Zheng
- Institute of Advanced Synthesis (IAS); School of Chemistry and Molecular Engineering; Nanjing Tech University; 211816 Nanjing China
| | - Velayudham Ramadoss
- Institute of Advanced Synthesis (IAS); School of Chemistry and Molecular Engineering; Nanjing Tech University; 211816 Nanjing China
| | - Yahui Wang
- Institute of Advanced Synthesis (IAS); School of Chemistry and Molecular Engineering; Nanjing Tech University; 211816 Nanjing China
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32
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Clement HA, Boghi M, McDonald RM, Bernier L, Coe JW, Farrell W, Helal CJ, Reese MR, Sach NW, Lee JC, Hall DG. High‐Throughput Ligand Screening Enables the Enantioselective Conjugate Borylation of Cyclobutenones to Access Synthetically Versatile Tertiary Cyclobutylboronates. Angew Chem Int Ed Engl 2019; 58:18405-18409. [DOI: 10.1002/anie.201909308] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/22/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Helen A. Clement
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Michele Boghi
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Rory M. McDonald
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Louise Bernier
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Jotham W. Coe
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - William Farrell
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Christopher J. Helal
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Matthew R. Reese
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Neal W. Sach
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Jack C. Lee
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Dennis G. Hall
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
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33
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Clement HA, Boghi M, McDonald RM, Bernier L, Coe JW, Farrell W, Helal CJ, Reese MR, Sach NW, Lee JC, Hall DG. High‐Throughput Ligand Screening Enables the Enantioselective Conjugate Borylation of Cyclobutenones to Access Synthetically Versatile Tertiary Cyclobutylboronates. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909308] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Helen A. Clement
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Michele Boghi
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Rory M. McDonald
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
| | - Louise Bernier
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Jotham W. Coe
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - William Farrell
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Christopher J. Helal
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Matthew R. Reese
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Neal W. Sach
- Pfizer Worldwide Research and DevelopmentLa Jolla Laboratories 10770 Science Center Drive San Diego CA 92121 USA
| | - Jack C. Lee
- Pfizer Worldwide Research and Development Eastern Point Road Groton CT 06340 USA
| | - Dennis G. Hall
- Department of Chemistry, 4-010 CCISUniversity of Alberta Edmonton Alberta T6G 2G2 Canada
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34
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Clausen F, Kischkewitz M, Bergander K, Studer A. Catalytic protodeboronation of pinacol boronic esters: formal anti-Markovnikov hydromethylation of alkenes. Chem Sci 2019; 10:6210-6214. [PMID: 31360428 PMCID: PMC6585874 DOI: 10.1039/c9sc02067e] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 05/15/2019] [Indexed: 01/02/2023] Open
Abstract
Pinacol boronic esters are highly valuable building blocks in organic synthesis. In contrast to the many protocols available on the functionalizing deboronation of alkyl boronic esters, protodeboronation is not well developed. Herein we report catalytic protodeboronation of 1°, 2° and 3° alkyl boronic esters utilizing a radical approach. Paired with a Matteson-CH2-homologation, our protocol allows for formal anti-Markovnikov alkene hydromethylation, a valuable but unknown transformation. The hydromethylation sequence was applied to methoxy protected (-)-Δ8-THC and cholesterol. The protodeboronation was further used in the formal total synthesis of δ-(R)-coniceine and indolizidine 209B.
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Affiliation(s)
- Florian Clausen
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraβe 40 , 48149 Münster , Germany .
| | - Marvin Kischkewitz
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraβe 40 , 48149 Münster , Germany .
| | - Klaus Bergander
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraβe 40 , 48149 Münster , Germany .
| | - Armido Studer
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraβe 40 , 48149 Münster , Germany .
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35
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Wang ZX, Li BJ. Construction of Acyclic Quaternary Carbon Stereocenters by Catalytic Asymmetric Hydroalkynylation of Unactivated Alkenes. J Am Chem Soc 2019; 141:9312-9320. [PMID: 31117476 DOI: 10.1021/jacs.9b03027] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Quaternary carbon stereocenters are common structural motifs in organic synthesis. The construction of these stereocenters in a catalytic and enantioselective manner remains a prominent synthetic challenge. In particular, methods for the synthesis of alkyne-substituted quaternary carbon stereocenters are very rare. Previous catalytic systems for hydroalkynylation of alkenes create tertiary stereocenters. We describe here an iridium catalyzed asymmetric hydroalkynylation of nonactivated trisubstituted alkene. The hydroalkynylation of β,γ-unsaturated amides occurs with high regio- and enantioselectivities to afford alkyne-substituted acyclic quaternary carbon stereocenters. Computational and experimental data suggest that the enantioselectivity is not only determined by the facial selectivity of the alkene but also by an alkene isomerization process. This strategy provides an efficient method to access alkyne-substituted acyclic quaternary carbon stereocenters with minimally functionalized starting materials.
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Affiliation(s)
- Zi-Xuan Wang
- Center of Basic Molecular Science (CBMS), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Bi-Jie Li
- Center of Basic Molecular Science (CBMS), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
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36
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He T, Li B, Liu LC, Wang J, Ma WP, Li GY, Zhang QW, He W. Copper-Catalyzed Trifunctionalization of Alkynes: Rapid Formation of Oxindoles Bearing Geminal Diboronates. Chemistry 2019; 25:966-970. [PMID: 30324715 DOI: 10.1002/chem.201804480] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Indexed: 11/09/2022]
Abstract
A copper-catalyzed trifunctionalization of alkynes that provides rapid access to oxindoles bearing a geminal diboronate side chain, highlighted by the simultaneous formation of one C-C bond and two C-B bonds, is reported. This new reaction features simple reaction conditions (ligand-free catalysis), a general substrate scope, and excellent chemoselectivity. Mechanistic study revealed a reaction sequence constituted by, in the order, borylation, intramolecular cross-coupling, hydroboration, which has been rarely documented.
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Affiliation(s)
- Tao He
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
| | - Bin Li
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
| | - Li-Chuan Liu
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
| | - Jing Wang
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
| | - Wen-Peng Ma
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
| | - Guang-Yu Li
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Ling Ling Road, Shanghai, 200032, P. R. China
| | - Qing-Wei Zhang
- Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Wei He
- MOE Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, P. R. China
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37
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Aparece MD, Gao C, Lovinger GJ, Morken JP. Vinylidenation of Organoboronic Esters Enabled by a Pd-Catalyzed Metallate Shift. Angew Chem Int Ed Engl 2019; 58:592-595. [PMID: 30444946 PMCID: PMC6414219 DOI: 10.1002/anie.201811782] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Indexed: 12/20/2022]
Abstract
Organoboron "ate" complexes undergo a net vinyl insertion reaction to give 1,1-disubstituted alkenyl boronic esters when treated with stoichiometric allyl acetate and a palladium catalyst. Reactions that employ vinyllithium afforded good to excellent yields after one hour, while reactions that employ vinylmagnesium chloride furnished modest to good yields after 18 hours.
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Affiliation(s)
| | | | | | - James P. Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA 02467, USA,
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38
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Aparece MD, Gao C, Lovinger GJ, Morken JP. Vinylidenation of Organoboronic Esters Enabled by a Pd‐Catalyzed Metallate Shift. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811782] [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]
Affiliation(s)
- Mark D. Aparece
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Chenpeng Gao
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Gabriel J. Lovinger
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
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39
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Carbopalladation of C–C σ-bonds enabled by strained boronate complexes. Nat Chem 2018; 11:117-122. [DOI: 10.1038/s41557-018-0181-x] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 10/29/2018] [Indexed: 12/12/2022]
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40
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Kim J, Cho SH. Access to Enantioenriched Benzylic 1,1-Silylboronate Esters by Palladium-Catalyzed Enantiotopic-Group Selective Suzuki–Miyaura Coupling of (Diborylmethyl)silanes with Aryl Iodides. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03979] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Junghoon Kim
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), 37673, Pohang, Republic of Korea
| | - Seung Hwan Cho
- Department of Chemistry, Pohang University of Science and Technology (POSTECH), 37673, Pohang, Republic of Korea
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41
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Panda S, Ready JM. Tandem Allylation/1,2-Boronate Rearrangement for the Asymmetric Synthesis of Indolines with Adjacent Quaternary Stereocenters. J Am Chem Soc 2018; 140:13242-13252. [DOI: 10.1021/jacs.8b06629] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Santanu Panda
- Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9038, United States
| | - Joseph M. Ready
- Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9038, United States
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42
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Sun SZ, Martin R. Nickel-Catalyzed Umpolung Arylation of Ambiphilic α-Bromoalkyl Boronic Esters. Angew Chem Int Ed Engl 2018; 57:3622-3625. [PMID: 29446875 DOI: 10.1002/anie.201712428] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Indexed: 12/14/2022]
Abstract
A nickel-catalyzed reductive arylation of ambiphilic α-bromoalkyl boronic esters with aryl halides is described. This platform provides an unrecognized opportunity to promote the catalytic umpolung reactivity of ambiphilic reagents with aryl halides, thus unlocking a new cross-coupling strategy that complements existing methods for the preparation of densely functionalized alkyl-substituted organometallic reagents from simple and readily accessible precursors.
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Affiliation(s)
- Shang-Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, Av. Països Catalans 16, 43007, Tarragona, Spain.,Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluïs Companys, 23, 08010, Barcelona, Spain
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43
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Sun SZ, Martin R. Nickel-Catalyzed Umpolung Arylation of Ambiphilic α-Bromoalkyl Boronic Esters. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712428] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Shang-Zheng Sun
- Institute of Chemical Research of Catalonia (ICIQ); The Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
| | - Ruben Martin
- Institute of Chemical Research of Catalonia (ICIQ); The Barcelona Institute of Science and Technology; Av. Països Catalans 16 43007 Tarragona Spain
- Catalan Institution for Research and Advanced Studies (ICREA); Passeig Lluïs Companys, 23 08010 Barcelona Spain
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44
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He Z, Song F, Sun H, Huang Y. Transition-Metal-Free Suzuki-Type Cross-Coupling Reaction of Benzyl Halides and Boronic Acids via 1,2-Metalate Shift. J Am Chem Soc 2018; 140:2693-2699. [PMID: 29360376 DOI: 10.1021/jacs.8b00380] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cross-coupling of organoboron compounds with electrophiles (Suzuki-Miyaura reaction) has greatly advanced C-C bond formation and has been well received in medicinal chemistry. During the past 50 years, transition metals have played a central role throughout the catalytic cycle of this important transformation. In this process, chemoselectivity among multiple carbon-halogen bonds is a common challenge. In particular, selective oxidative addition of transition metals to alkyl halides rather than aryl halides is difficult due to unfavorable transition states and bond strengths. We describe a new approach that uses a single organic sulfide catalyst to activate both C(sp3) halides and arylboronic acids via a zwitterionic boron "ate" intermediate. This "ate" species undergoes a 1,2-metalate shift to afford Suzuki coupling products using benzyl chlorides and arylboronic acids. Various diaryl methane analogues can be prepared, including those with complex and biologically active motifs. The reactions proceed under transition-metal-free conditions, and C(sp2) halides, including aryl bromides and iodides, are unaffected. The orthogonal chemoselectivity is demonstrated in the streamlined synthesis of highly functionalized diaryl methane scaffolds using multi-halogenated substrates. Preliminary mechanistic experiments suggest both the sulfonium salt and the sulfur ylide are involved in the reaction, with the formation of sulfonium salt being the slowest step in the overall catalytic cycle.
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Affiliation(s)
- Zhiqi He
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University , Shenzhen 518055, China
| | - Feifei Song
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University , Shenzhen 518055, China
| | - Huan Sun
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University , Shenzhen 518055, China
| | - Yong Huang
- Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School, Peking University , Shenzhen 518055, China
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45
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Millán A, Grigol Martinez PD, Aggarwal VK. Stereocontrolled Synthesis of Polypropionate Fragments based on a Building Block Assembly Strategy using Lithiation-Borylation Methodologies. Chemistry 2017; 24:730-735. [DOI: 10.1002/chem.201704946] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Alba Millán
- School of Chemistry; University of Bristol, Cantock's Close; Bristol BS8 1TS UK
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46
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Jang WJ, Song SM, Moon JH, Lee JY, Yun J. Copper-Catalyzed Enantioselective Hydroboration of Unactivated 1,1-Disubstituted Alkenes. J Am Chem Soc 2017; 139:13660-13663. [PMID: 28899086 DOI: 10.1021/jacs.7b08379] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report an efficient and highly enantioselective hydroboration of aliphatic 1,1-disubstituted alkenes with pinacolborane using a phosphine-Cu catalyst. The method allows facile preparation of enantiomerically enriched β-chiral alkyl pinacolboronates from a range of 1,1-disubstituted alkenes with high enantioselectivity up to 99% ee. Unprecedented enantiodiscrimination between the geminal alkyl substituents was observed with functional group compatibility in the hydroboration. Furthermore, a catalyst loading as low as 1 mol % furnished the desired product without a decrease in yield or selectivity, demonstrating its efficiency in gram scale synthesis.
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Affiliation(s)
- Won Jun Jang
- Department of Chemistry and Institute of Basic Science, Sungkyunkwan University , Suwon 16419, Korea
| | - Seung Min Song
- Department of Chemistry and Institute of Basic Science, Sungkyunkwan University , Suwon 16419, Korea
| | - Jong Hun Moon
- Department of Chemistry and Institute of Basic Science, Sungkyunkwan University , Suwon 16419, Korea
| | - Jin Yong Lee
- Department of Chemistry and Institute of Basic Science, Sungkyunkwan University , Suwon 16419, Korea
| | - Jaesook Yun
- Department of Chemistry and Institute of Basic Science, Sungkyunkwan University , Suwon 16419, Korea
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47
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Hoang GL, Takacs JM. Enantioselective γ-borylation of unsaturated amides and stereoretentive Suzuki-Miyaura cross-coupling. Chem Sci 2017; 8:4511-4516. [PMID: 28758006 PMCID: PMC5514528 DOI: 10.1039/c7sc01093a] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 04/19/2017] [Indexed: 01/06/2023] Open
Abstract
The rhodium-catalyzed, directed catalytic asymmetric hydroboration of γ,δ-unsaturated amides affords a direct route to chiral acyclic secondary γ-borylated carbonyl derivatives in high enantiomeric purity. In contrast to a similar β-borylated amide derivative, the γ-borylated amide undergoes Suzuki-Miyaura cross-coupling with stereoretention. The utility of the boronic ester products is further illustrated by other stereospecific C-B bond transformations leading to γ-amino acid derivatives, 1,4-amino alcohols, and 5-substituted-γ-lactone and γ-lactam ring systems.
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Affiliation(s)
- Gia L Hoang
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , NE 68588-0304 , USA .
| | - James M Takacs
- Department of Chemistry , University of Nebraska-Lincoln , Lincoln , NE 68588-0304 , USA .
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48
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Armstrong RJ, Niwetmarin W, Aggarwal VK. Synthesis of Functionalized Alkenes by a Transition-Metal-Free Zweifel Coupling. Org Lett 2017; 19:2762-2765. [PMID: 28453280 DOI: 10.1021/acs.orglett.7b01124] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The Zweifel reaction is a powerful method for the synthesis of alkenes, serving as a transition-metal-free alternative to the Suzuki-Miyaura reaction. To date, the scope of the Zweifel coupling has been rather narrow and has focused mainly on the coupling of vinyllithium reagents to synthesize simple aryl- and alkyl-substituted olefins. Herein, the development of a general transition-metal-free coupling process enabling the coupling of Grignard reagents or organolithiums is described. This method enables the enantiospecific synthesis of a wide variety of functionalized acyclic and cyclic olefin products.
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Affiliation(s)
- Roly J Armstrong
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Worawat Niwetmarin
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
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49
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Iterative assembly line synthesis of polypropionates with full stereocontrol. Nat Chem 2017; 9:896-902. [DOI: 10.1038/nchem.2757] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 02/27/2017] [Indexed: 12/23/2022]
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50
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Blair DJ, Tanini D, Bateman JM, Scott HK, Myers EL, Aggarwal VK. Selective uni- and bidirectional homologation of diborylmethane. Chem Sci 2017; 8:2898-2903. [PMID: 28451355 PMCID: PMC5376717 DOI: 10.1039/c6sc05338f] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 01/19/2017] [Indexed: 01/28/2023] Open
Abstract
Diborylmethane can be homologated uni- and bidirectionally by using enantiomerically pure lithium-stabilized carbenoids to give 1,2- and 1,3-bis(boronic esters), respectively, in good yield and with excellent levels of enantio- and diastereoselectivity. The high sensitivity of the transformation to steric hindrance enables the exclusive operation of either manifold, effected through the judicious choice of the type of carbenoid, which can be a sparteine-ligated or a diamine-free lithiated benzoate/carbamate. The scope of the 1,2-bis(boronic esters) so generated is complementary to that encompassed by the asymmetric diboration of alkenes, in that primary-secondary and primary-tertiary 1,2-bis(boronic esters) can be prepared with equally high levels of selectivity and that functional groups, such as terminal alkynes and alkenes, are tolerated. Methods for forming C2-symmetric and non-symmetrical anti and syn 1,3-bis(boronic esters) are also described and represent a powerful route towards 1,3-functionalized synthetic intermediates.
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Affiliation(s)
- Daniel J Blair
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
| | - Damiano Tanini
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
| | - Joseph M Bateman
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
| | - Helen K Scott
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
| | - Eddie L Myers
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
| | - Varinder K Aggarwal
- School of Chemistry , University of Bristol , Cantock's Close , Bristol , BS8 1TS , UK .
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