1
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Tran MK, Ready JM. Chemoselective and Stereoselective Allylation of Bis(alkenyl)boronates. Angew Chem Int Ed Engl 2024:e202407824. [PMID: 38781007 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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Shen HC, Wang ZS, Noble A, Aggarwal VK. Simultaneous Stereoinvertive and Stereoselective C(sp 3)-C(sp 3) Cross-Coupling of Boronic Esters and Allylic Carbonates. J Am Chem Soc 2024; 146:13719-13726. [PMID: 38721780 PMCID: PMC11117407 DOI: 10.1021/jacs.4c03686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 05/03/2024] [Accepted: 05/03/2024] [Indexed: 05/23/2024]
Abstract
With increasing interest in constructing more three-dimensional entities, there has been growing interest in cross-coupling reactions that forge C(sp3)-C(sp3) bonds, which leads to additional challenges as it is not just a more difficult bond to construct but issues of stereocontrol also arise. Herein, we report the stereocontrolled cross-coupling of enantioenriched boronic esters with racemic allylic carbonates enabled by iridium catalysis, leading to the formation of C(sp3)-C(sp3) bonds with single or vicinal stereogenic centers. The method shows broad substrate scope, enabling primary, secondary, and even tertiary boronic esters to be employed, and can be used to prepare any of the four possible stereoisomers of a coupled product with vicinal chiral centers. The new method, which combines the simultaneous enantiospecific reaction of a chiral nucleophile with the enantioselective reaction of a chiral electrophile in a single process, offers a solution for stereodivergent cross-coupling of two C(sp3) fragments.
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Affiliation(s)
| | | | - Adam Noble
- 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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3
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Shaff AB, Yang L, Lee MT, Lalic G. Stereospecific and Regioselective Synthesis of E-Allylic Alcohols through Reductive Cross Coupling of Terminal Alkynes. J Am Chem Soc 2023. [PMID: 37917569 DOI: 10.1021/jacs.3c06963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
We have developed a convergent method for the synthesis of allylic alcohols that involves a reductive coupling of terminal alkynes with α-chloro boronic esters. The new method affords allylic alcohols with excellent regioselectivity (anti-Markovnikov) and an E/Z ratio greater than 200:1. The reaction can be performed in the presence of a wide range of functional groups and has a substrate scope that complements the stoichiometric alkenylation of α-chloro boronic esters performed using alkenyl lithium and Grignard reagents. The transformation is stereospecific and allows for the robust and highly selective synthesis of chiral allylic alcohols. Our studies support a mechanism that involves hydrocupration of the alkyne and cross-coupling of the alkenyl copper intermediate with α-chloro boronic esters. Experimental evidence excludes a radical mechanism of the cross-coupling step and is consistent with the formation of a boron-ate intermediate and a 1,2-metalate shift.
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Affiliation(s)
- Austin B Shaff
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Langxuan Yang
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Mitchell T Lee
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Gojko Lalic
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
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4
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Linne Y, Lohrberg D, Struwe H, Linne E, Stohwasser A, Kalesse M. 1,2-Metallate Rearrangement as a Toolbox for the Synthesis of Allylic Alcohols. J Org Chem 2023; 88:12623-12629. [PMID: 37594929 PMCID: PMC10476192 DOI: 10.1021/acs.joc.3c01309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Indexed: 08/20/2023]
Abstract
The development of new methods and protocols for the synthesis of biologically active substances remains one of the most important pillars in organic chemistry, and one of these privileged structural motifs are allylic alcohols. The method of choice to date for the synthesis of these is the Nozaki-Hiyama-Takai-Kishi reaction. We describe here a valuable alternative to the synthesis of allylic alcohols via 1,2-metallate rearrangement. In this work, various vinyl boronic esters with different functional groups have been applied in the Hoppe-Matteson-Aggarwal reaction. In addition, two monoterpenoids were constructed via this convergent synthetic strategy.
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Affiliation(s)
- Yannick Linne
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Daniel Lohrberg
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Henry Struwe
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Elvira Linne
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Anastasia Stohwasser
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, 30167 Hannover, Germany
| | - Markus Kalesse
- Institute
of Organic Chemistry, 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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5
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Barker TJ, Bogatkevich A, Crowder DW, Gierszal SG, Hayes JC, Hollerbach MR, Russell RW. Reactions of Benzylboronate Nucleophiles. SYNTHESIS-STUTTGART 2023; 55:2639-2647. [PMID: 37790600 PMCID: PMC10545366 DOI: 10.1055/a-2072-2754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
This short review summarizes our laboratory's development of benzylboronic esters as nucleophiles. Activation of the benzylboronic ester is achieved by irreversible coordination of an alkyllithium Lewis base to form a nucleophilic benzylboronate. This boronate was found to react with aldehydes, imines, ketones and alkyl bromides. A copper catalyst was employed in reactions of the boronate with epoxides and aziridines.
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Affiliation(s)
- Timothy J Barker
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Andrew Bogatkevich
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Dallas W Crowder
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Sophia G Gierszal
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Jacob C Hayes
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Michael R Hollerbach
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
| | - Richard W Russell
- College of Charleston, Department of Chemistry and Biochemistry, 66 George St., Charleston, SC
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6
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Keita H, Meek SJ. Synthesis of Quaternary and Tertiary Carbon-Substituted Arenes by Lewis Base Promoted Site-Selective Coupling with Allylic Nucleophiles. Angew Chem Int Ed Engl 2023; 62:e202306277. [PMID: 37350059 PMCID: PMC10529890 DOI: 10.1002/anie.202306277] [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: 05/05/2023] [Revised: 06/10/2023] [Accepted: 06/21/2023] [Indexed: 06/24/2023]
Abstract
A practical method for the preparation of quaternary and tertiary allyl-substituted heteroarenes by site-selective couplings of heteroaryl nitriles and allylic nucleophiles is disclosed. Transformations utilize readily accessible stable reagents, proceed in the presence of a Lewis base activator, and undergo aryl-C(sp3 ) quaternary and tertiary carbon formation with high γ-selectivity (up to >98 : 2 γ : α).
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Affiliation(s)
- Hawa Keita
- Department of Chemistry, University of North Carolina at Chapel Hill, 27599-3290, Chapel Hill, NC, USA
| | - Simon J Meek
- Department of Chemistry, University of North Carolina at Chapel Hill, 27599-3290, Chapel Hill, NC, USA
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7
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Shen HC, Popescu MV, Wang ZS, de Lescure L, Noble A, Paton RS, Aggarwal VK. Iridium-Catalyzed Asymmetric Difunctionalization of C-C σ-Bonds Enabled by Ring-Strained Boronate Complexes. J Am Chem Soc 2023. [PMID: 37471704 PMCID: PMC10401714 DOI: 10.1021/jacs.3c03248] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
Enantioenriched organoboron intermediates are important building blocks in organic synthesis and drug discovery. Recently, transition metal-catalyzed enantioselective 1,2-metalate rearrangements of alkenylboronates have emerged as an attractive protocol to access these valuable reagents by installing two different carbon fragments across C═C π-bonds. Herein, we report the development of an iridium-catalyzed asymmetric allylation-induced 1,2-metalate rearrangement of bicyclo[1.1.0]butyl (BCB) boronate complexes enabled by strain release, which allows asymmetric difunctionalization of C-C σ-bonds, including dicarbonation and carboboration. This protocol provides a variety of enantioenriched three-dimensional 1,1,3-trisubstituted cyclobutane products bearing a boronic ester that can be readily derivatized. Notably, the reaction gives trans diastereoisomers that result from an anti-addition across the C-C σ-bond, which is in contrast to the syn-additions observed for reactions promoted by PdII-aryl complexes and other electrophiles in our previous works. The diastereoselectivity has been rationalized based on a combination of experimental data and density functional theory calculations, which suggest that the BCB boronate complexes are highly nucleophilic and react via early transition states with low activation barriers.
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Affiliation(s)
- Hong-Cheng Shen
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Mihai V Popescu
- Department of Chemistry, Colorado State University, Ft. Collins, Colorado 80523-1872, United States
| | - Ze-Shu Wang
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Louis de Lescure
- Department of Chemistry, Colorado State University, Ft. Collins, Colorado 80523-1872, United States
| | - Adam Noble
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Robert S Paton
- Department of Chemistry, Colorado State University, Ft. Collins, Colorado 80523-1872, United States
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
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8
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Linne Y, Birkner M, Flormann J, Lücke D, Becker JA, Kalesse M. Sparteine-Free, Highly Stereoselective Construction of Complex Allylic Alcohols Using 1,2-Metallate Rearrangements. JACS AU 2023; 3:1695-1710. [PMID: 37388702 PMCID: PMC10301690 DOI: 10.1021/jacsau.3c00114] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 05/02/2023] [Accepted: 05/03/2023] [Indexed: 07/01/2023]
Abstract
Stereotriads bearing allylic alcohols are privileged structures in natural products, and new methods accessing these in a stereoselective fashion are highly sought after. Toward this goal, we found that the use of chiral polyketide fragments allows for performing the Hoppe-Matteson-Aggarwal rearrangement in the absence of sparteine with high yields and diastereoselectivities, rendering this protocol a highly valuable alternative to the Nozaki-Hiyama-Takai-Kishi reaction. The switch of directing groups in most cases resulted in the reversed stereochemical outcome, which could be explained by conformational analysis on density functional theory level and a Felkin-like model.
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Affiliation(s)
- Yannick Linne
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Maike Birkner
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Jan Flormann
- Institute
of Physical Chemistry and Electrochemistry, Gottfried Wilhelm Leibniz Universität Hannover, Callinstraße 3a, 30167 Hannover, Germany
| | - Daniel Lücke
- Institute
of Organic Chemistry, Gottfried Wilhelm
Leibniz Universität Hannover, Schneiderberg 1b, 30167 Hannover, Germany
| | - Jörg August Becker
- Institute
of Physical Chemistry and Electrochemistry, Gottfried Wilhelm Leibniz Universität Hannover, Callinstraße 3a, 30167 Hannover, Germany
| | - Markus Kalesse
- Institute
of 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
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9
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Wang Q, Eriksson L, Szabó KJ. Catalytic Homologation‐Allylboration Sequence for Diastereo‐ and Enantioselective Synthesis of Densely Functionalized β‐Fluorohydrins with Tertiary Fluoride Stereocenters. Angew Chem Int Ed Engl 2023. [DOI: 10.1002/ange.202301481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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10
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Sakamoto R, Odagi M, Yamanaka M, Nagasawa K. A 1,3-boron shift reaction of homoallenylboronates to synthesise 2-boryl-1,3-dienes. Chem Commun (Camb) 2023; 59:4217-4220. [PMID: 36939650 DOI: 10.1039/d2cc06600a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
We describe a 1,3-boron shift-type reaction of homoallenylboronates at the center (sp) carbon in allenes to afford 2-boryl-1,3-dienes with a variety of substituents. Notably, this reaction occurs in situ with allenylboronates in the presence of carbamate and a small excess of sec-BuLi, and it is not necessary to isolate the unstable homoallenylboronates.
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Affiliation(s)
- Ryota Sakamoto
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Ko-ganei, Tokyo 184-8588, Japan.
| | - Minami Odagi
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Ko-ganei, Tokyo 184-8588, Japan.
| | - Masahiro Yamanaka
- Department of Chemistry, Faculty of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo, 171-8501, Japan
| | - Kazuo Nagasawa
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Ko-ganei, Tokyo 184-8588, Japan.
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11
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Levi Knippel J, Ni AZ, Schuppe AW, Buchwald SL. A General Strategy for the Asymmetric Preparation of α-Stereogenic Allyl Silanes, Germanes, and Boronate Esters via Dual Copper Hydride- and Palladium-Catalysis. Angew Chem Int Ed Engl 2022; 61:e202212630. [PMID: 36137941 PMCID: PMC9828222 DOI: 10.1002/anie.202212630] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Indexed: 01/12/2023]
Abstract
α-Stereogenic allyl metalloids are versatile synthetic intermediates which can undergo various stereocontrolled transformations. Most existing methods to prepare α-stereogenic allyl metalloids involve multi-step sequences that curtail the number of compatible substrates and are limited to the synthesis of boronates. Here, we report a general method for the enantioselective preparation of α-stereogenic allyl metalloids utilizing dual CuH- and Pd-catalysis. This approach leverages a stereoretentive Cu-to-Pd transmetalation of an in situ generated alkyl copper species to allow access to enantioenriched allyl silanes, germanes, and boronate esters with broad functional group compatibility.
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Affiliation(s)
- James Levi Knippel
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
| | - Anton Z Ni
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
| | - Alexander W Schuppe
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
| | - Stephen L Buchwald
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
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12
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Wang Q, Nilsson T, Eriksson L, Szabó KJ. Sulfenofunctionalization of Chiral α-Trifluoromethyl Allylboronic Acids: Asymmetric Synthesis of SCF 3 , SCF 2 R, SCN and SAr Compounds. Angew Chem Int Ed Engl 2022; 61:e202210509. [PMID: 36152310 PMCID: PMC9828052 DOI: 10.1002/anie.202210509] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Indexed: 01/12/2023]
Abstract
We report herein a new method for the synthesis of densely functionalized chiral allyl SCF3 , SCF2 R, SCN and SAr species with a separate CF3 functionality. The synthetic approach is based on selenium-catalyzed sulfenofunctionalization of chiral α-CF3 allylboronic acids. The reactions proceeded with remarkably high stereo-, diastereo- and site-selectivity, based on the formation of a stable thiiranium ion followed by rapid deborylative ring opening.
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Affiliation(s)
- Qiang Wang
- Department of Organic ChemistryStockholm UniversitySE-10691StockholmSweden
| | - Tomas Nilsson
- Department of Organic ChemistryStockholm UniversitySE-10691StockholmSweden
| | - Lars Eriksson
- Department of Materials and Environmental ChemistryStockholm UniversitySE-10691StockholmSweden
| | - Kálmán J. Szabó
- Department of Organic ChemistryStockholm UniversitySE-10691StockholmSweden
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13
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Davis CR, Fu Y, Liu P, Ready JM. Mechanistic Basis for the Iridium-Catalyzed Enantioselective Allylation of Alkenyl Boronates. J Am Chem Soc 2022; 144:16118-16130. [PMID: 36036508 DOI: 10.1021/jacs.2c06493] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Iridium(phosphoramidite) complexes catalyze an enantio- and diastereoselective three-component coupling reaction of alkenyl boronic esters, organolithium reagents, and secondary allylic carbonates. The reaction proceeds through an allylation-induced 1,2-metalate shift of the alkenyl boronate to form non-adjacent stereocenters. Mechanistic investigations outline the overall catalytic cycle and reveal trends in reactivity and selectivity. Analysis of relative stereochemistry in products derived from a variety of 1,1-disubtituted alkenyl boronates provides insight into the transition state of the addition and indicates a concerted pathway. Kinetic analysis of the reaction revealed the kinetic order dependence in boronate, the catalyst, and both the slow- and fast-reacting enantiomer of allylic carbonate as well as the turnover-limiting step of the reaction. Determination of nucleophile-specific parameters N and sN for alkenyl boronate complexes enabled comparison to other classes of nucleophiles. DFT calculations indicate the addition of the alkenyl boronate to the cationic Ir(π-allyl) intermediate and the 1,2-metalate shift occur in a concerted mechanism. The stereoselectivity is determined by ligand-substrate steric repulsions and dispersion interactions in the syn addition transition state. Hammett studies supported the computational results with regard to electronic trends observed with both aryl-derived alkenyl boronates and aryl carbonates.
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Affiliation(s)
- Colton R Davis
- Department of Biochemistry, UT Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas 75390-9038, United States
| | - Yue Fu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, 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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14
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Photo-induced trifunctionalization of bromostyrenes via remote radical migration reactions of tetracoordinate boron species. Nat Commun 2022; 13:1784. [PMID: 35379818 PMCID: PMC8980057 DOI: 10.1038/s41467-022-29466-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 03/11/2022] [Indexed: 11/23/2022] Open
Abstract
Tetracoordinate boron species have emerged as radical precursors via deboronation by photo-induced single electron transfer (SET) pathway. These reactions usually produce an alkyl radical and boron-bound species, and the valuable boron species are always discarded as a by-product. Given the importance of boron species, it will be very attractive if the two parts could be incorporated into the eventual products. Herein we report a photo-catalyzed strategy in which in situ generated tetracoordinated boron species decomposed into both alkyl radicals and boron species under visible light irradiation, due to the pre-installation of a vinyl group on the aromatic ring, the newly generated alkyl radical attacks the vinyl group while leaving the boron species on ipso-position, then both radical part and boron moiety are safely incorporated into the final product. Tertiary borons, secondary borons, gem-diborons as well as 1,2-diborons, and versatile electrophiles are all well tolerated under this transformation, of note, ortho-, meta- and para-bromostyrenes all demonstrated good capabilities. The reaction portraits high atom economy, broad substrate scope, and diversified valuable products with tertiary or quaternary carbon center generated, with diborons as substrates, Csp2-B and Csp3-B are established simultaneously, which are precious synthetic building blocks in chemical synthesis. Tetracoordinate boron species are common radical precursors in organic synthesis, but the boron species are discarded as by-products. Herein the authors report a strategy to incorporate both the alkyl moiety and boron species into the eventual products, yielding organoboron compounds.
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15
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Zhao Y, Ge S. Synergistic Hydrocobaltation and Borylcobaltation Enable Regioselective Migratory Triborylation of Unactivated Alkenes. Angew Chem Int Ed Engl 2022; 61:e202116133. [PMID: 35088939 DOI: 10.1002/anie.202116133] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Indexed: 01/06/2023]
Abstract
The structural diversity of sp3 -triorganometallic reagents enhances their potentiality in the modular construction of molecular complexity in chemical synthesis. Despite significant achievements on the preparation of sp3 1,1,1- and 1,1,2-triorganometallic B,B,B-reagents, catalytic approaches that enable the installation of multiple boryl groups at skipped carbons of unactivated alkenes still remain elusive. Herein, we report a cobalt-catalyzed selective triborylation reaction of unactivated alkenes to access synthetically versatile 1,1,3-triborylalkanes. This triborylation protocol provides a general platform for regioselective trifunctionalization of unactivated alkenes, and its utility is highlighted by the synthesis of various value-added chemicals from readily accessible unactivated alkenes. Mechanistic studies, including deuterium-labelling experiments and evaluation of potential reactive intermediates, provide insight into the experimentally observed chemo- and regioselectivity.
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Affiliation(s)
- Yinsong Zhao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore, Singapore
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16
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Zhao Y, Ge S. Synergistic Hydrocobaltation and Borylcobaltation Enable Regioselective Migratory Triborylation of Unactivated Alkenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116133] [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)
- Yinsong Zhao
- National University of Singapore Department of Chemistry 3 Science Drive 3 117543 Singapore SINGAPORE
| | - Shaozhong Ge
- National University of Singapore Chemistry 3 Science Drive 3 117543 Singapore SINGAPORE
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17
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Wang Q, Biosca M, Himo F, Szabó KJ. Electrophilic Fluorination of Alkenes via Bora‐Wagner–Meerwein Rearrangement. Access to β‐Difluoroalkyl Boronates. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Qiang Wang
- Department of Organic Chemistry Stockholm University Sweden
| | - Maria Biosca
- Department of Organic Chemistry Stockholm University Sweden
| | - Fahmi Himo
- Department of Organic Chemistry Stockholm University Sweden
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18
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Wang Q, Biosca M, Himo F, Szabó KJ. Electrophilic Fluorination of Alkenes via Bora-Wagner-Meerwein Rearrangement. Access to β-Difluoroalkyl Boronates. Angew Chem Int Ed Engl 2021; 60:26327-26331. [PMID: 34613633 PMCID: PMC9299629 DOI: 10.1002/anie.202109461] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/06/2021] [Indexed: 01/26/2023]
Abstract
The electrophilic fluorination of geminal alkyl substituted vinyl‐Bmida derivatives proceeds via bora‐Wagner–Meerwein rearrangement. According to DFT modelling studies this rearrangement occurs with a low activation barrier via a bora‐cyclopropane shaped TS. The Bmida group has a larger migration aptitude than the alkyl moiety in the Wagner–Meerwein rearrangement of the presented electrophilic fluorination reactions.
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Affiliation(s)
- Qiang Wang
- Department of Organic Chemistry, Stockholm University, Sweden
| | - Maria Biosca
- Department of Organic Chemistry, Stockholm University, Sweden
| | - Fahmi Himo
- Department of Organic Chemistry, Stockholm University, Sweden
| | - Kálmán J Szabó
- Department of Organic Chemistry, Stockholm University, Sweden
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19
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Ozawa Y, Endo K, Ito H. Regio- and Stereoselective Synthesis of Multi-Alkylated Allylic Boronates through Three-Component Coupling Reactions between Allenes, Alkyl Halides, and a Diboron Reagent. J Am Chem Soc 2021; 143:13865-13877. [PMID: 34424698 DOI: 10.1021/jacs.1c06538] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multisubstituted allylic boronates are attractive and valuable precursors for the rapid and stereoselective construction of densely substituted carbon skeletons. Herein, we report the first synthetic approach for differentially 2,3,3-trialkyl-substituted allylic boronates that contain a stereodefined tetrasubstituted alkene structure. Copper(I)-catalyzed regio- and stereoselective three-component coupling reactions between gem-dialkylallenes, alkyl halides, and a diboron reagent afforded sterically congested allylic boronates. The allylboration of aldehydes diastereoselectively furnished the corresponding homoallylic alcohols that bear a quaternary carbon. A computational study revealed that the selectivity-determining mechanism was correlated to the coordination of a boryl copper(I) species to the allene substrate as well as the borylcupration step.
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Affiliation(s)
- Yu Ozawa
- Division of Applied Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Kohei Endo
- Division of Applied Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Hajime Ito
- Division of Applied Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan.,Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
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20
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Ali G, Cuny GD. Syntheses of Gymnothespirolignans B and C and Non-natural Isomer 9-Epi-gymnothespirolignan B. J Org Chem 2021; 86:10517-10525. [PMID: 34282914 DOI: 10.1021/acs.joc.1c01159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Syntheses of polycyclic spiro lignans gymnothespirolignans B and C as well as the unnatural isomer 9-epi-gymnothespirolignan B were accomplished using (R)-Roche ester and an appropriately substituted fluorenone. Key features of the convergent syntheses include coupling of the fluorenone and an iodo-alkene intermediate derived from (R)-Roche ester in the presence of the Lewis acid TiCl(OiPr)3, C9-O bond formation via an SN2 reaction with retention of stereochemistry, and diastereoselective hydrogenations of a common alkene intermediate guided by accessibility or positioning by the C8-methoxy.
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Affiliation(s)
- Ghada Ali
- Department of Chemistry, College of Natural Sciences and Mathematics, University of Houston, Houston, Texas 77204, United States
| | - Gregory D Cuny
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, Texas 77204, United States
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21
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Hari DP, Madhavachary R, Fasano V, Haire J, Aggarwal VK. Highly Diastereoselective Strain-Increase Allylborations: Rapid Access to Alkylidenecyclopropanes and Alkylidenecyclobutanes. J Am Chem Soc 2021; 143:7462-7470. [PMID: 33950678 DOI: 10.1021/jacs.1c01966] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Allylboration of carbonyl compounds is one of the most widely used methods in the stereoselective synthesis of natural products. However, these powerful transformations are so far limited to allyl- or crotylboron reagents; ring-strained substituents in the α-position have not been investigated. Such substrates would lead to an increase in strain energy upon allylboration and as such cause a significant increase in the activation barrier of the reaction. Indeed, no reaction was observed between an α-cyclopropyl allylboronic ester and an aldehyde. However, by converting the boronic ester into the much more reactive borinic ester, the allylboration proceeded well giving alkylidenecyclopropanes in high yield. This process was highly diastereoselective and gives rapid access to versatile alkylidenecyclopropanes and alkylidenecyclobutanes. The chemistry shows a broad substrate scope in terms of both the range of vinylcycloalkyl boronic esters and aldehydes that can be employed. The intermediate boronate complexes were also found to be potent nucleophiles, reacting with a range of non-carbonyl-based electrophiles and radicals, leading to an even broader range of alkylidenecyclopropanes and alkylidenecyclobutanes. Using 11B NMR experiments, we were able to track the intermediates involved, and DFT calculations supported the experimental findings.
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Affiliation(s)
- Durga Prasad Hari
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | | | - Valerio Fasano
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Jack Haire
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
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22
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Xu N, Xu J, Zhu Q, Liu C. Synthesis of Allylboronates via Zweifel‐type Deprotonative Olefination. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001351] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Nuo Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation & CAS Key Laboratory of Chemistry of Northwestern Plant Resources Suzhou Research Institute Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049
| | - Jianeng Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation & CAS Key Laboratory of Chemistry of Northwestern Plant Resources Suzhou Research Institute Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049
| | - Qing Zhu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation & CAS Key Laboratory of Chemistry of Northwestern Plant Resources Suzhou Research Institute Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 People's Republic of China
- University of Chinese Academy of Sciences Beijing 100049
| | - Chao Liu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation & CAS Key Laboratory of Chemistry of Northwestern Plant Resources Suzhou Research Institute Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 People's Republic of China
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23
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Zhao Y, Ge S. Chromium-Catalyzed Selective Dimerization/Hydroboration of Allenes to Access Boryl-Functionalized Skipped (E,Z)-Dienes. Angew Chem Int Ed Engl 2021; 60:2149-2154. [PMID: 33027539 DOI: 10.1002/anie.202012344] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Indexed: 11/10/2022]
Abstract
A chromium-catalyzed dimerization/hydroboration of allenes is developed to access synthetically versatile boryl-functionalized skipped dienes with a catalyst generated in situ from CrCl2 and a pyridine-2,6-diimine ligand mes PDI. A variety of allenes reacted with pinacolborane (HBpin) to afford the corresponding boryl-functionalized (E,Z)-1,4-dienes in high yields and with excellent selectivity. Electron paramagnetic resonance (EPR) spectroscopic studies suggest that this chromium-catalyzed reaction probably proceeds through a chromium(I) hydride intermediate.
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Affiliation(s)
- Yinsong Zhao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Shaozhong Ge
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
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24
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Zhao Y, Ge S. Chromium‐Catalyzed Selective Dimerization/Hydroboration of Allenes to Access Boryl‐Functionalized Skipped (
E
,
Z
)‐Dienes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202012344] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yinsong Zhao
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
| | - Shaozhong Ge
- Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore
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25
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Pierrot D, Marek I. Stereospecific Reactions Leading to Allylboronic Esters Within Acyclic Systems Bearing Distant Stereocenters. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010135] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- David Pierrot
- Schulich Faculty of Chemistry, Technion— Israel Institute of Technology Technion City 3200009 Haifa Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion— Israel Institute of Technology Technion City 3200009 Haifa Israel
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26
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Pierrot D, Marek I. Stereospecific Reactions Leading to Allylboronic Esters Within Acyclic Systems Bearing Distant Stereocenters. Angew Chem Int Ed Engl 2020; 59:20434-20438. [PMID: 32757448 DOI: 10.1002/anie.202010135] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/05/2020] [Indexed: 11/11/2022]
Abstract
The preparation of acyclic molecules featuring congested stereocenters in a 1,4-relationship in only three catalytic steps from commercially available building blocks is reported. This approach involves a diastereoselective diboration of alkenyl cyclopropyl methanol derivatives followed by a regioselective exergonic ring fragmentation. The starting materials can be prepared enantiomerically enriched and all substituents can be interconverted, therefore, this strategy allows a large variety of diversely functionalized allylboronic esters possessing distant tetrasubstituted stereocenters with high diastereoselectivity.
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Affiliation(s)
- David Pierrot
- Schulich Faculty of Chemistry, Technion-, Israel Institute of Technology, Technion City, 3200009, Haifa, Israel
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion-, Israel Institute of Technology, Technion City, 3200009, Haifa, Israel
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27
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Takeda M, Nagao K, Ohmiya H. Transition‐Metal‐Free Cross‐Coupling by Using Tertiary Benzylic Organoboronates. Angew Chem Int Ed Engl 2020; 59:22460-22464. [DOI: 10.1002/anie.202010251] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Indexed: 12/21/2022]
Affiliation(s)
- Mitsutaka Takeda
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Kazunori Nagao
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Hirohisa Ohmiya
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
- JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
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28
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Takeda M, Nagao K, Ohmiya H. Transition‐Metal‐Free Cross‐Coupling by Using Tertiary Benzylic Organoboronates. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010251] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mitsutaka Takeda
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Kazunori Nagao
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Hirohisa Ohmiya
- Division of Pharmaceutical Sciences Graduate School of Medical Sciences Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
- JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
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29
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Trost BM, Zhang G. Ruthenium-Catalyzed Intermolecular Coupling of Vinylic 1,2-Bisboronates with Alkynes: Stereoselective Access to Boryl-Substituted Homoallylic Alcohols. J Am Chem Soc 2020; 142:7312-7316. [DOI: 10.1021/jacs.0c01755] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, Stanford, California 94035-5080, United States
| | - Guoting Zhang
- Department of Chemistry, Stanford University, Stanford, California 94035-5080, United States
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30
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Hari DP, Abell JC, Fasano V, Aggarwal VK. Ring-Expansion Induced 1,2-Metalate Rearrangements: Highly Diastereoselective Synthesis of Cyclobutyl Boronic Esters. J Am Chem Soc 2020; 142:5515-5520. [PMID: 32146807 DOI: 10.1021/jacs.0c00813] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The broad synthetic utility of organoboron compounds stems from their ready ability to undergo 1,2-migrations. Normally, such shifts are induced by α-leaving groups or by reactions of alkenyl boronates with electrophiles. Herein, we present a new strategy to induce 1,2-metalate rearrangements, via ring expansion of vinylcyclopropyl boronate complexes activated by electrophiles. This leads to a cyclopropane-stabilized carbocation, which triggers ring expansion and concomitant 1,2-metalate rearrangement. This novel process delivers medicinally relevant 1,2-substituted cyclobutyl boronic esters with high levels of diastereoselectivity. A wide range of organolithiums and Grignard reagents, electrophiles, and vinylcyclopropyl boronic esters can be used. The methodology was applied to a short, stereoselective synthesis of (±)-grandisol. Computational studies indicate that the reaction proceeds via a nonclassical carbocation followed by anti-1,2-migration.
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Affiliation(s)
- Durga Prasad Hari
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Joseph C Abell
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, U.K
| | - Valerio Fasano
- 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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31
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A unified approach for divergent synthesis of contiguous stereodiads employing a small boronyl group. Nat Commun 2020; 11:792. [PMID: 32034155 PMCID: PMC7005891 DOI: 10.1038/s41467-020-14592-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Accepted: 01/13/2020] [Indexed: 11/29/2022] Open
Abstract
Acyclic contiguous stereocenters are frequently seen in biologically active natural and synthetic molecules. Although various synthetic methods have been reported, predictable and unified approaches to all possible stereoisomers are rare, particularly for those containing non-reactive hydrocarbon substituents. Herein, a β-boronyl group is employed as a readily accessible handle for predictable α-functionalization of enolates with either syn or anti selectivity depending on reaction conditions. Contiguous tertiary-tertiary and tertiary-quaternary stereocenters are thus accessed in generally good yields and diastereoselectivity. Based on experimental and computational studies, mechanism for syn selective alkylation is proposed, and Bpin (pinacolatoboronyl) behaves as a smaller group than most carbon-centered groups. The synthetic utility of this methodology is demonstrated by preparation of several key intermediates for bioactive molecules. Predictable and unified approaches to all possible stereoisomers of acyclic compounds with contiguous stereocentres are rare. Here, the authors disclose a divergent α-functionalization of enolates with either syn or anti selectivity employing a β-boronyl group as a small, directing handle.
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32
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Roscales S, Csáky AG. How to make C–N bonds using boronic acids and their derivatives without transition metals. Chem Soc Rev 2020; 49:5159-5177. [DOI: 10.1039/c9cs00735k] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
No need for transition-metal catalysis in amination, amidation, nitration or nitrosation reactions with boron derivatives as reagents.
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Affiliation(s)
- Silvia Roscales
- Instituto Pluridisciplinar
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
| | - Aurelio G. Csáky
- Instituto Pluridisciplinar
- Universidad Complutense de Madrid
- 28040 Madrid
- Spain
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33
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Kiyokawa K, Kainuma S, Minakata S. Electrophilic Amination of Allylic Boranes with Azodicarboxylates: Synthesis of α,α-Disubstituted Allylic Amine Derivatives. CHEM LETT 2019. [DOI: 10.1246/cl.190448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kensuke Kiyokawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Shunpei Kainuma
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Satoshi Minakata
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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34
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Shen F, Zheng H, Xue XS, Lu L, Shen Q. Transition-Metal-Free ipso-Trifluoromethylthiolation of Lithium Aryl Boronates. Org Lett 2019; 21:6347-6351. [DOI: 10.1021/acs.orglett.9b02236] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Feng Shen
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Hanliang Zheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tanjin 300071, China
| | - Xiao-Song Xue
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tanjin 300071, China
| | - Long Lu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Qilong Shen
- Key Laboratory of Organofluorine Chemistry, Center for Excellence in Molecular Synthesis, 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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35
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Tehri P, Peddinti RK. DBU-catalyzed [3 + 2] cycloaddition and Michael addition reactions of 3-benzylidene succinimides with 3-ylidene oxindoles and chalcones. Org Biomol Chem 2019; 17:3964-3970. [PMID: 30942810 DOI: 10.1039/c9ob00385a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A metal-free DBU catalyzed protocol has been developed for the regioselective [3 + 2] cycloaddition reactions of 3-benzylidene succinimides with 3-ylidene oxindoles to furnish spirooxindole derivatives. The 3-benzylidene succinimides underwent Michael addition with chalcones to provide benzylidene succinimide-tethered propanones. All the reactions proceeded under mild conditions and the products were isolated by simple filtration and washing with ethanol in good yields. The current methodology utilizes simple precursors and provides functionally-rich succinimides with two to five contiguous stereocenters in excellent diastereoselectivity and with complete regioselectivity.
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Affiliation(s)
- Piyush Tehri
- Department of Chemistry, Indian Institute of Technology, Roorkee-247667, Uttarakhand, India.
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36
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Peng S, Yang J, Liu G, Huang Z. Ligand controlled cobalt catalyzed regiodivergent 1,2-hydroboration of 1,3-dienes. Sci China Chem 2019. [DOI: 10.1007/s11426-018-9418-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Hollerbach MR, Hayes JC, Barker TJ. Benzylation of Imines with Activated Boronate Nucleophiles. European J Org Chem 2019; 2019:1646-1648. [PMID: 32099525 DOI: 10.1002/ejoc.201801804] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Benzylation reactions of N-tosyl imines and N-tert-butanesulfinyl imines using benzylboronic acid pinacol ester are reported. s-Butyllithium was used to activate the boronic ester, rendering it nucleophilic. The reaction was compatible with electronically diverse substituents on the imine in both substrate classes. Good diastereoselectivity was observed in additions to N-tert-butylsulfinylaldimines. The diastereoselectivity observed in these reactions is consistent with an open transition state for the addition. Examples of a secondary alkylboronic ester nucleophile and an N-tert-butanesulfinyl trifluoromethylketimine electrophile are also included.
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Affiliation(s)
- Michael R Hollerbach
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, USA
| | - Jacob C Hayes
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, USA
| | - Timothy J Barker
- Department of Chemistry and Biochemistry, College of Charleston, Charleston, South Carolina 29424, USA
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38
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Kiyokawa K, Hata S, Kainuma S, Minakata S. Electrophilic cyanation of allylic boranes: synthesis of β,γ-unsaturated nitriles containing allylic quaternary carbon centers. Chem Commun (Camb) 2019; 55:458-461. [DOI: 10.1039/c8cc09229j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The electrophilic cyanation of allylic boranes, a process that enables the construction of allylic quaternary carbon centers, is reported.
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Affiliation(s)
- Kensuke Kiyokawa
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Yamadaoka 2-1, Suita
- Osaka 565-0871
| | - Shotaro Hata
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Yamadaoka 2-1, Suita
- Osaka 565-0871
| | - Shunpei Kainuma
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Yamadaoka 2-1, Suita
- Osaka 565-0871
| | - Satoshi Minakata
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Yamadaoka 2-1, Suita
- Osaka 565-0871
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39
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Abstract
This review presents the methods available for the fluorination and radiofluorination of aromatic and aliphatic organoboron compounds.
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Affiliation(s)
- Graham Pattison
- Chemistry Research Group
- School of Pharmacy and Biomolecular Sciences
- University of Brighton
- Brighton
- UK
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40
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Hetzler BE, Volpin G, Vignoni E, Petrovic AG, Proni G, Hu CT, Trauner D. A Versatile Bis-Allylboron Reagent for the Stereoselective Synthesis of Chiral Diols. Angew Chem Int Ed Engl 2018; 57:14276-14280. [PMID: 30144261 DOI: 10.1002/anie.201808234] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Indexed: 01/03/2023]
Abstract
Allylboron reagents are popular in synthesis owing to their versatility and the predictable stereochemical outcomes of their reactions with carbonyl compounds. Herein, we describe the synthesis of (Z,Z)-hexadienyl bis-boronate 1, a configurationally stable, crystalline, and easy to handle compound, which represents a class of bis-allylic boron reagents with heretofore untapped synthetic potential. In combination with a chiral phosphoric acid catalyst, the reagent can be employed for the enantioselective allyl transfer reaction to a variety of one-pot transformations, enabling swift access to functionalized 1,n-diols. The in situ conversion of the reagent into the corresponding bis-borinic ester allows for the direct and diastereoselective two-fold allyl transfer to aldehydes. This affords C2 - or Ci -symmetric stereotetrads containing a 1,4-diol moiety for natural product synthesis. The usefulness of our method was demonstrated with a short synthesis of the lignan (±)-neo-olivil.
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Affiliation(s)
- Belinda E Hetzler
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Giulio Volpin
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Elisa Vignoni
- Department of Drug Sciences, University of Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Ana G Petrovic
- Department of Life Sciences, New York Institute of Technology, 1855 Broadway, New York, NY, 10023, USA
| | - Gloria Proni
- Department of Sciences, John Jay College of Criminal Justice, 524 West 54th Street, New York, NY, 10019, USA
| | - Chunhua T Hu
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Dirk Trauner
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, USA
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41
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Hetzler BE, Volpin G, Vignoni E, Petrovic AG, Proni G, Hu CT, Trauner D. Ein vielseitiges Bisallylbor‐Reagenz für die stereoselektive Synthese von chiralen Diolen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808234] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Belinda E. Hetzler
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
| | - Giulio Volpin
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
| | - Elisa Vignoni
- Department of Drug Sciences University of Pavia Via Taramelli 12 27100 Pavia Italien
| | - Ana G. Petrovic
- Department of Life Sciences New York Institute of Technology 1855 Broadway New York NY 10023 USA
| | - Gloria Proni
- Department of Sciences John Jay College of Criminal Justice 524 West 54th Street New York NY 10019 USA
| | - Chunhua T. Hu
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
| | - Dirk Trauner
- Department of Chemistry New York University 100 Washington Square East New York NY 10003 USA
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42
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Butcher TW, Hartwig JF. Enantioselective Synthesis of Tertiary Allylic Fluorides by Iridium-Catalyzed Allylic Fluoroalkylation. Angew Chem Int Ed Engl 2018; 57:13125-13129. [PMID: 30136379 DOI: 10.1002/anie.201807474] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/17/2018] [Indexed: 12/16/2022]
Abstract
Few allylic electrophiles containing two different substituents at a single allyl terminus and none in which one of the two substituents is a heteroatom, have been shown previously to react with iridium catalysts to form substitution products. We report that iridium-catalysts are uniquely suited to form tertiary allylic fluorides enantioselectively by the addition of a diverse range of carbon-centered nucleophiles at the fluorine-containing terminus of 3-fluoro-substituted allylic esters. The products contain tertiary stereogenic centers bearing a single fluorine, which are isosteric with common tertiary stereocenters containing a single hydrogen. Computational studies reveal the principal steric interactions influencing the stability of endo and exo π-allyl intermediates formed from 3,3-disubstituted allylic electrophiles.
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Affiliation(s)
- Trevor W Butcher
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
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43
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Butcher TW, Hartwig JF. Enantioselective Synthesis of Tertiary Allylic Fluorides by Iridium‐Catalyzed Allylic Fluoroalkylation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807474] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Trevor W. Butcher
- Department of Chemistry University of California Berkeley CA 94720 USA
| | - John F. Hartwig
- Department of Chemistry University of California Berkeley CA 94720 USA
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44
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Kischkewitz M, Gerleve C, Studer A. Radical-Polar Crossover Reactions of Dienylboronate Complexes: Synthesis of Functionalized Allylboronic Esters. Org Lett 2018; 20:3666-3669. [PMID: 29874093 PMCID: PMC6039077 DOI: 10.1021/acs.orglett.8b01459] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
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Radical-polar
crossover reactions of dienylboronate complexes are
applied to the synthesis of functionalized secondary and tertiary
allylboronic esters. The transition-metal-free three-component coupling
uses readily accessible dienylboronate esters as substrates in combination
with various sp3/sp2 carbon nucleophiles and
commercial alkyl iodides as radical precursors. In the visible light-initiated
radical chain process, two new C–C bonds are formed, and the E-double bond geometry in the product allylboronic esters
is controlled with good to excellent selectivity.
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Affiliation(s)
- Marvin Kischkewitz
- Institute of Organic Chemistry, Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
| | - Carolin Gerleve
- Institute of Organic Chemistry, Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
| | - Armido Studer
- Institute of Organic Chemistry, Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
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45
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Zheng P, Zhai Y, Zhao X, XU T. Difunctionalization of ketones via gem-bis(boronates) to synthesize quaternary carbon with high selectivity. Chem Commun (Camb) 2018; 54:13375-13378. [DOI: 10.1039/c8cc07781a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A transformation of gem-bis(boronate) compounds with different electrophiles through a tertiary boronate intermediate to concurrently introduce aldehyde and allylic groups, which provides an efficient protocol to difunctionalize ketones, was reported.
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Affiliation(s)
- Purui Zheng
- Shanghai Key Laboratory of Chemical Assessment and Sustainability
- School of Chemical Science and Engineering
- Tongji University
- Shanghai
- P. R. China
| | - Yujie Zhai
- Shanghai Key Laboratory of Chemical Assessment and Sustainability
- School of Chemical Science and Engineering
- Tongji University
- Shanghai
- P. R. China
| | - Xiaoming Zhao
- Shanghai Key Laboratory of Chemical Assessment and Sustainability
- School of Chemical Science and Engineering
- Tongji University
- Shanghai
- P. R. China
| | - Tao XU
- Shanghai Key Laboratory of Chemical Assessment and Sustainability
- School of Chemical Science and Engineering
- Tongji University
- Shanghai
- P. R. China
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