1
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Guo Y, Wang X, Li C, Su J, Xu J, Song Q. Decarboxylation of β-boryl NHPI esters enables radical 1,2-boron shift for the assembly of versatile organoborons. Nat Commun 2023; 14:5693. [PMID: 37709736 PMCID: PMC10502150 DOI: 10.1038/s41467-023-41254-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 08/28/2023] [Indexed: 09/16/2023] Open
Abstract
In recent years, numerous 1,2-R shift (R = aliphatic or aryl) based on tetracoordinate boron species have been well investigated. In the contrary, the corresponding radical migrations, especially 1,2-boryl radical shift for the construction of organoborons is still in its infancy. Given the paucity and significance of such strategies in boron chemistry, it is urgent to develop other efficient and alternative synthetic protocols to enrich these underdeveloped radical 1,2-boron migrations, before their fundamental potential applications could be fully explored at will. Herein, we have demonstrated a visible-light-induced photoredox neutral decarboxylative radical cross-coupling reaction, which undergoes a radical 1,2-boron shift to give a translocated C-radical for further capture of versatile radical acceptors. The mild reaction conditions, good functional-group tolerance, and broad β-boryl NHPI esters scope as well as versatile radical acceptors make this protocol applicable in modification of bioactive molecules. It can be expected that this methodology will be a very useful tool and an alternative strategy for the construction of primary organoborons via a novel radical 1,2-boron shift mode.
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Affiliation(s)
- Yu Guo
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China
| | - Xiaosha Wang
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China
| | - Chengbo Li
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China
| | - Jianke Su
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China
| | - Jian Xu
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China.
| | - Qiuling Song
- Institute of Next Generation Matter Transformation, College of Material Sciences Engineering, Huaqiao University, 361021, Xiamen, Fujian, P. R. China.
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, 350108, Fuzhou, P. R. China.
- School of Chemistry and Chemical Engineering, Henan Normal University, 453007, Xinxiang, Henan, P. R. China.
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2
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Zhang X, Gao C, Morken JP. Enantioselective Construction of Carbocyclic and Heterocyclic Tertiary Boronic Esters by Conjunctive Cross-Coupling Reaction. J Am Chem Soc 2023; 145:16344-16349. [PMID: 37487220 PMCID: PMC10925917 DOI: 10.1021/jacs.3c05815] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
Synthesis of stereodefined carbocyclic and heterocyclic tertiary boronic esters is accomplished by performing a conjunctive cross-coupling reaction on preformed cyclic boron ate complexes. Boronates bearing spirocyclic and aryl bicyclic skeletons can be synthesized enantioselectively using a chiral PHOX-ligated Pd catalyst with achiral starting material, while substrates bearing continuous stereogenic centers can be generated diastereoselectively. A variety of aryl and alkenyl electrophiles are incorporated.
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Affiliation(s)
- Xuntong Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Chenpeng Gao
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - James P Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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3
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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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4
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McGettigan JE, Ready JM. Diastereoselective Alkylation of Activated Nitrogen Heterocycles with Alkenyl Boronate Complexes. Angew Chem Int Ed Engl 2023; 62:e202216961. [PMID: 36780188 PMCID: PMC10073296 DOI: 10.1002/anie.202216961] [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: 11/18/2022] [Revised: 02/11/2023] [Accepted: 02/13/2023] [Indexed: 02/14/2023]
Abstract
Alkenyl boronate complexes react with acylated quinolines and isoquinolines via 1,2-metalate rearrangement to give alkylated, dearomatized heterocycles in good yields, diastereoselectivities, and regioselectivities. This multi-component coupling is highly modular and can be used to access a wide scope of heterocyclic scaffolds. Chiral boronic esters made through this methodology possess high synthetic potential and can be transformed into various functional groups in one step without racemization.
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Affiliation(s)
- James E McGettigan
- 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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5
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Gao C, Wilhelmsen CA, Morken JP. Palladium-Catalyzed Conjunctive Cross-Coupling with Electronically Asymmetric Ligands. J Org Chem 2023; 88:1828-1835. [PMID: 36696654 PMCID: PMC10407824 DOI: 10.1021/acs.joc.2c02341] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Palladium-catalyzed conjunctive cross-coupling can be accomplished with the use of chiral phosphine-oxazoline based ligand structures. Of note, the reaction can be conducted on Grignard-based boron ate complexes and operates without the use of halide-scavenging additives, which are required for other catalyst systems.
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Affiliation(s)
- Chenpeng Gao
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Christopher A Wilhelmsen
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - James P Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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6
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Wilhelmsen CA, Zhang X, Myhill JA, Morken JP. Enantioselective Synthesis of Tertiary β‐Boryl Amides by Conjunctive Cross‐Coupling of Alkenyl Boronates and Carbamoyl Chlorides. Angew Chem Int Ed Engl 2022; 61:e202116784. [PMID: 35090083 PMCID: PMC8960357 DOI: 10.1002/anie.202116784] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Indexed: 12/15/2022]
Abstract
Synthesis of versatile β tert-boryl amides is accomplished by conjunctive cross-coupling of α-substituted alkenyl boron "ate" complexes and carbamoyl chloride electrophiles. This reaction can be accomplished in an enantioselective fashion using a palladium catalyst in combination with MandyPhos. The addition of water results in enhanced chemoselectivity for the conjunctive coupling product relative to the Suzuki-Miyaura cross-coupling product. Transformations of the reaction products were examined as well as application to the synthesis of (+)-adalinine.
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Affiliation(s)
| | - Xuntong Zhang
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Jesse A. Myhill
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
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7
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Morken JP, Wilhelmsen CA, Zhang X, Myhill JA. Enantioselective Synthesis of Tertiary β‐Boryl Amides by Conjunctive Cross‐Coupling of Alkenyl Boronates and Carbamoyl Chlorides. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202116784] [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)
- James Patrick Morken
- Boston College Dept. of Chemistry 2609 Beacon Street, Merkert Chemistry Lab 02467 Chestnut Hill UNITED STATES
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8
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Mizoguchi H, Kamada H, Morimoto K, Yoshida R, Sakakura A. Annulative Coupling of Vinylboronic Esters: Aryne-Triggered 1,2-Metallate Rearrangement. Chem Sci 2022; 13:9580-9585. [PMID: 36091886 PMCID: PMC9400639 DOI: 10.1039/d2sc02623f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 07/25/2022] [Indexed: 11/27/2022] Open
Abstract
A stereoselective annulative coupling of a vinylboronic ester ate-complex with arynes producing cyclic borinic esters has been developed. An annulation reaction that proceeded through the formation of two C–C bonds and a C–B bond was realized by exploiting a 1,2-metallate rearrangement of boronate triggered by the addition of a vinyl group to the strained triple bond of an aryne. The generated aryl anion would then cyclize to a boron atom to complete the annulation cascade. The annulated borinic ester could be converted to boronic acids and their derivatives by oxidation, halogenation, and cross-coupling. Particularly, halogenation and Suzuki–Miyaura coupling proceeded in a site-selective fashion and produced highly substituted alkylboronic acid derivatives. A stereoselective annulative coupling of a vinylboronic ester ate-complex with arynes producing cyclic borinic esters has been developed.![]()
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Affiliation(s)
- Haruki Mizoguchi
- Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka Kita-ku Okayama 700-8530 Japan
| | - Hidetoshi Kamada
- Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka Kita-ku Okayama 700-8530 Japan
| | - Kazuki Morimoto
- Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka Kita-ku Okayama 700-8530 Japan
| | - Ryuji Yoshida
- Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka Kita-ku Okayama 700-8530 Japan
| | - Akira Sakakura
- Graduate School of Natural Science and Technology, Okayama University 3-1-1 Tsushima-naka Kita-ku Okayama 700-8530 Japan
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9
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You C, Studer A. Three-component 1,2-carboamination of vinyl boronic esters via amidyl radical induced 1,2-migration. Chem Sci 2021; 12:15765-15769. [PMID: 35003609 PMCID: PMC8654000 DOI: 10.1039/d1sc05811h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 11/16/2021] [Indexed: 12/25/2022] Open
Abstract
Three-component 1,2-carboamination of vinyl boronic esters with alkyl/aryl lithium reagents and N-chloro-carbamates/carboxamides is presented. Vinylboron ate complexes generated in situ from the boronic ester and an organo lithium reagent are shown to react with readily available N-chloro-carbamates/carboxamides to give valuable 1,2-aminoboronic esters. These cascades proceed in the absence of any catalyst upon simple visible light irradiation. Amidyl radicals add to the vinylboron ate complexes followed by oxidation and 1,2-alkyl/aryl migration from boron to carbon to give the corresponding carboamination products. These practical cascades show high functional group tolerance and accordingly exhibit broad substrate scope. Gram-scale reaction and diverse follow-up transformations convincingly demonstrate the synthetic potential of this method.
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Affiliation(s)
- Cai You
- 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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10
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Segura L, Massad I, Ogasawara M, Marek I. Stereodivergent Access to Trisubstituted Alkenylboronate Esters through Alkene Isomerization. Org Lett 2021; 23:9194-9198. [PMID: 34766777 PMCID: PMC8650100 DOI: 10.1021/acs.orglett.1c03513] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
![]()
We report an efficient
method for the preparation of synthetically
valuable trisubstituted alkenylboronate esters through alkene
isomerization of their readily available 1,1-disubstituted regioisomeric
counterparts. Either stereoisomer of the target alkenylboronate
motif can be obtained at will from the same starting material by employing
different isomerization catalysts.
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Affiliation(s)
- Lucas Segura
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200009, Israel
| | - Itai Massad
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200009, Israel
| | - Masamichi Ogasawara
- Department of Natural Science, Graduate School of Science and Technology, Tokushima University, Tokushima 770-8506, Japan
| | - Ilan Marek
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200009, Israel
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11
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Simlandy AK, Brown MK. Allenylidene Induced 1,2‐Metalate Rearrangement of Indole‐Boronates: Diastereoselective Access to Highly Substituted Indolines. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Amit Kumar Simlandy
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN 47401 USA
| | - M. Kevin Brown
- Department of Chemistry Indiana University 800 E. Kirkwood Ave. Bloomington IN 47401 USA
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12
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Simlandy AK, Brown MK. Allenylidene Induced 1,2-Metalate Rearrangement of Indole-Boronates: Diastereoselective Access to Highly Substituted Indolines. Angew Chem Int Ed Engl 2021; 60:12366-12370. [PMID: 33734546 DOI: 10.1002/anie.202103108] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Indexed: 12/14/2022]
Abstract
A process to achieve 1,2-metalate rearrangements of indole boronate as a way to access substituted indolines in high diastereoselectivities is presented. The reaction involves the generation of a Cu-allenylidene, which is sufficiently electrophilic to induce the 1,2-metalate rearrangement. The scope of the reaction is evaluated as well as further transformations of the product.
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Affiliation(s)
- Amit Kumar Simlandy
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, IN, 47401, USA
| | - M Kevin Brown
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, IN, 47401, USA
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13
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Mizoguchi H, Sakakura A. Strain-release Difunctionalization of C–C σ- and π-bonds of an Organoboron Ate-complex through 1,2-Metallate Rearrangement. CHEM LETT 2021. [DOI: 10.1246/cl.200926] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Haruki Mizoguchi
- Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Akira Sakakura
- Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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14
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Kanti Das K, Manna S, Panda S. Transition metal catalyzed asymmetric multicomponent reactions of unsaturated compounds using organoboron reagents. Chem Commun (Camb) 2021; 57:441-459. [PMID: 33350405 DOI: 10.1039/d0cc06460b] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Asymmetric multicomponent reactions allow stitching several functional groups in an enantioselective and atom economical manner. The introduction of boron-based reagents as a multicomponent coupling partner has its own merits. In addition to being non-toxic and highly stable, organoboron compounds can be easily converted to other functional groups in a stereoselective manner. In the last decade several transition metal catalyzed asymmetric multicomponent strategies have been evolved using boron based reagents. This review will discuss the merits and scope of multicomponent strategies based on their difference in the reaction mechanism and transition metals involved.
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Affiliation(s)
- Kanak Kanti Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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15
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You C, Studer A. Synthesis of 1,3-Bis-(boryl)alkanes through Boronic Ester Induced Consecutive Double 1,2-Migration. Angew Chem Int Ed Engl 2020; 59:17245-17249. [PMID: 32579295 PMCID: PMC7540398 DOI: 10.1002/anie.202007541] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Indexed: 01/03/2023]
Abstract
A general and efficient approach for the preparation of 1,3-bis-(boryl)alkanes is introduced. It is shown that readily generated vinylboron ate complexes react with commercially available ICH2 Bpin to valuable 1,3-bis-(boryl)alkanes. The introduced transformation, which is experimentally easy to conduct, shows broad substrate scope and high functional-group tolerance. Mechanistic studies reveal that the reaction does not proceed via radical intermediates. Instead, an unprecedented boronic ester induced sequential bis-1,2-migration cascade is suggested.
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Affiliation(s)
- Cai You
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
| | - Armido Studer
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
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16
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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: 83] [Impact Index Per Article: 20.8] [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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17
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Bennett SH, Fawcett A, Denton EH, Biberger T, Fasano V, Winter N, Aggarwal VK. Difunctionalization of C-C σ-Bonds Enabled by the Reaction of Bicyclo[1.1.0]butyl Boronate Complexes with Electrophiles: Reaction Development, Scope, and Stereochemical Origins. J Am Chem Soc 2020; 142:16766-16775. [PMID: 32885974 DOI: 10.1021/jacs.0c07357] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Difunctionalization reactions of C-C σ-bonds have the potential to streamline access to molecules that would otherwise be difficult to prepare. However, the development of such reactions is challenging because C-C σ-bonds are typically unreactive. Exploiting the high ring-strain energy of polycyclic carbocycles is a common strategy to weaken and facilitate the reaction of C-C σ-bonds, but there are limited examples of highly strained C-C σ-bonds being used in difunctionalization reactions. We demonstrate that highly strained bicyclo[1.1.0]butyl boronate complexes (strain energy ca. 65 kcal/mol), which were prepared by reacting boronic esters with bicyclo[1.1.0]butyl lithium, react with electrophiles to achieve the diastereoselective difunctionalization of the strained central C-C σ-bond of the bicyclo[1.1.0]butyl unit. The reaction shows broad substrate scope, with a range of different electrophiles and boronic esters being successfully employed to form a diverse set of 1,1,3-trisubstituted cyclobutanes (>50 examples) with high diastereoselectivity. The high diastereoselectivity observed has been rationalized based on a combination of experimental data and DFT calculations, which suggests that separate concerted and stepwise reaction mechanisms are operating, depending upon the migrating substituent and electrophile used.
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Affiliation(s)
- Steven H Bennett
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Alexander Fawcett
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Elliott H Denton
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Tobias Biberger
- 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
| | - Nils Winter
- 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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18
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You C, Studer A. Synthesis of 1,3‐Bis‐(boryl)alkanes through Boronic Ester Induced Consecutive Double 1,2‐Migration. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007541] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Cai You
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
| | - Armido Studer
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Corrensstrasse 40 48149 Münster Germany
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19
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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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20
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Kalita SJ, Cheng F, Huang Y. Recent Advances of Applying Boron‐Reagents in Asymmetric Total Syntheses of Natural Products and Bio‐Active Molecules. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000413] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Subarna Jyoti Kalita
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
| | - Feng Cheng
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
| | - Yi‐Yong Huang
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 People's Republic of China
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21
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Kischkewitz M, Friese FW, Studer A. Radical-Induced 1,2-Migrations of Boron Ate Complexes. Adv Synth Catal 2020; 362:2077-2087. [PMID: 32612487 PMCID: PMC7319355 DOI: 10.1002/adsc.201901503] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/20/2019] [Indexed: 11/21/2022]
Abstract
1,2-Boron ate rearrangements represent a fundamental class of transformations to establish new C-C bonds while retaining the valuable boron moiety in the product. In established ionic processes, the boron ate complex is activated by an external electrophile to induce a 1,2-migration from boron to an adjacent sp 3 or sp 2 carbon atom. Recently, two complementary radical polar crossover approaches have been explored for both classes, 1,2-migrations to sp 2 and sp 3 carbon centers. This review describes the general concepts in this emerging research field and summarizes recent developments of radical-induced 1,2-migrations from boron to carbon.
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Affiliation(s)
- Marvin Kischkewitz
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
| | - Florian W. Friese
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
| | - Armido Studer
- Organisch-Chemisches InstitutWestfälische Wilhelms-UniversitätCorrensstrasse 4048149MünsterGermany
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22
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Meng Y, Kong Z, Morken JP. Catalytic Enantioselective Synthesis of anti-Vicinal Silylboronates by Conjunctive Cross-Coupling. Angew Chem Int Ed Engl 2020; 59:8456-8459. [PMID: 32078229 PMCID: PMC7359638 DOI: 10.1002/anie.202000937] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Indexed: 01/04/2023]
Abstract
Chiral 1,2-bimetallic reagents are useful motifs in synthetic chemistry. Although syn-1,2-bimetallic compounds can be prepared by alkene dimetallation, anti-1,2-bimetallics are still rare. The stereospecific 1,2-metallate shift that occurs during conjunctive cross-coupling is shown to enable a practical and modular approach to the catalytic synthesis of enantioenriched anti-1,2-borosilanes. In addition to reaction development, the synthetic utility of anti-1,2-borosilanes was investigated, including applications to the synthesis of anti-1,2-diols and anti-1,2-amino alcohols.
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Affiliation(s)
- Yan Meng
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA 02467, USA
| | - Ziyin Kong
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA 02467, USA
| | - James P. Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA 02467, USA
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23
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Law C, Kativhu E, Wang J, Morken JP. Diastereo- and Enantioselective 1,4-Difunctionalization of Borylenynes by Catalytic Conjunctive Cross-Coupling. Angew Chem Int Ed Engl 2020; 59:10311-10315. [PMID: 32212403 DOI: 10.1002/anie.202001580] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Indexed: 01/04/2023]
Abstract
Enantioselective conjunctive cross-coupling of enyne-derived boronate complexes occurs with 1,4 addition of the electrophile and migrating group across the π system. This reaction pathway furnishes α-boryl allenes as the reaction product. In the presence of a chiral catalyst, both the central and axial chirality of the product can be controlled during product formation.
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Affiliation(s)
- Chunyin Law
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Elton Kativhu
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Johnny Wang
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - James P Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
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24
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Law C, Kativhu E, Wang J, Morken JP. Diastereo‐ and Enantioselective 1,4‐Difunctionalization of Borylenynes by Catalytic Conjunctive Cross‐Coupling. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001580] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Chunyin Law
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Elton Kativhu
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Johnny Wang
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
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25
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Meng Y, Kong Z, Morken JP. Catalytic Enantioselective Synthesis of
anti
‐Vicinal Silylboronates by Conjunctive Cross‐Coupling. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000937] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Yan Meng
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Ziyin Kong
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
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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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Fan D, Zhang J, Hu Y, Zhang Z, Gridnev ID, Zhang W. Asymmetric Hydrogenation of α-Boryl Enamides Enabled by Nonbonding Interactions. ACS Catal 2020. [DOI: 10.1021/acscatal.9b04543] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Dongyang Fan
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Jian Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Yanhua Hu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Zhenfeng Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Ilya D. Gridnev
- Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki 3-6, Aoba-ku, Sendai 980-8578, Japan
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
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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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Bigler R, Mack KA, Shen J, Tosatti P, Han C, Bachmann S, Zhang H, Scalone M, Pfaltz A, Denmark SE, Hildbrand S, Gosselin F. Asymmetric Hydrogenation of Unfunctionalized Tetrasubstituted Acyclic Olefins. Angew Chem Int Ed Engl 2020; 59:2844-2849. [PMID: 31794118 DOI: 10.1002/anie.201912640] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Indexed: 12/31/2022]
Abstract
Asymmetric hydrogenation has evolved as one of the most powerful tools to construct stereocenters. However, the asymmetric hydrogenation of unfunctionalized tetrasubstituted acyclic olefins remains the pinnacle of asymmetric synthesis and an unsolved challenge. We report herein the discovery of an iridium catalyst for the first, generally applicable, highly enantio- and diastereoselective hydrogenation of such olefins and the mechanistic insights of the reaction. The power of this chemistry is demonstrated by the successful hydrogenation of a wide variety of electronically and sterically diverse olefins in excellent yield and high enantio- and diastereoselectivity.
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Affiliation(s)
- Raphael Bigler
- Pharmaceutical Division, Small Molecules Technical Development, Department of Process Chemistry and Catalysis, F. Hoffmann-La Roche Ltd, 4070, Basel, Switzerland
| | - Kyle A Mack
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Jeff Shen
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Paolo Tosatti
- Pharmaceutical Division, Small Molecules Technical Development, Department of Process Chemistry and Catalysis, F. Hoffmann-La Roche Ltd, 4070, Basel, Switzerland
| | - Chong Han
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Stephan Bachmann
- Pharmaceutical Division, Small Molecules Technical Development, Department of Process Chemistry and Catalysis, F. Hoffmann-La Roche Ltd, 4070, Basel, Switzerland
| | - Haiming Zhang
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA, 94080, USA
| | - Michelangelo Scalone
- Pharmaceutical Division, Small Molecules Technical Development, Department of Process Chemistry and Catalysis, F. Hoffmann-La Roche Ltd, 4070, Basel, Switzerland
| | - Andreas Pfaltz
- Department of Chemistry, University of Basel, 4056, Basel, Switzerland
| | - Scott E Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, IL, 61801, USA
| | - Stefan Hildbrand
- Pharmaceutical Division, Small Molecules Technical Development, Department of Process Chemistry and Catalysis, F. Hoffmann-La Roche Ltd, 4070, Basel, Switzerland
| | - Francis Gosselin
- Department of Small Molecule Process Chemistry, Genentech, Inc., 1 DNA Way, South San Francisco, CA, 94080, USA
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30
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Bigler R, Mack KA, Shen J, Tosatti P, Han C, Bachmann S, Zhang H, Scalone M, Pfaltz A, Denmark SE, Hildbrand S, Gosselin F. Asymmetric Hydrogenation of Unfunctionalized Tetrasubstituted Acyclic Olefins. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912640] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Raphael Bigler
- Pharmaceutical DivisionSmall Molecules Technical DevelopmentDepartment of Process Chemistry and CatalysisF. Hoffmann-La Roche Ltd 4070 Basel Switzerland
| | - Kyle A. Mack
- Department of Small Molecule Process ChemistryGenentech, Inc. 1 DNA Way South San Francisco CA 94080 USA
| | - Jeff Shen
- Department of Small Molecule Process ChemistryGenentech, Inc. 1 DNA Way South San Francisco CA 94080 USA
| | - Paolo Tosatti
- Pharmaceutical DivisionSmall Molecules Technical DevelopmentDepartment of Process Chemistry and CatalysisF. Hoffmann-La Roche Ltd 4070 Basel Switzerland
| | - Chong Han
- Department of Small Molecule Process ChemistryGenentech, Inc. 1 DNA Way South San Francisco CA 94080 USA
| | - Stephan Bachmann
- Pharmaceutical DivisionSmall Molecules Technical DevelopmentDepartment of Process Chemistry and CatalysisF. Hoffmann-La Roche Ltd 4070 Basel Switzerland
| | - Haiming Zhang
- Department of Small Molecule Process ChemistryGenentech, Inc. 1 DNA Way South San Francisco CA 94080 USA
| | - Michelangelo Scalone
- Pharmaceutical DivisionSmall Molecules Technical DevelopmentDepartment of Process Chemistry and CatalysisF. Hoffmann-La Roche Ltd 4070 Basel Switzerland
| | - Andreas Pfaltz
- Department of ChemistryUniversity of Basel 4056 Basel Switzerland
| | - Scott E. Denmark
- Roger Adams LaboratoryDepartment of ChemistryUniversity of Illinois Urbana IL 61801 USA
| | - Stefan Hildbrand
- Pharmaceutical DivisionSmall Molecules Technical DevelopmentDepartment of Process Chemistry and CatalysisF. Hoffmann-La Roche Ltd 4070 Basel Switzerland
| | - Francis Gosselin
- Department of Small Molecule Process ChemistryGenentech, Inc. 1 DNA Way South San Francisco CA 94080 USA
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31
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Koo SM, Vendola AJ, Momm SN, Morken JP. Alkyl Group Migration in Ni-Catalyzed Conjunctive Coupling with C(sp 3) Electrophiles: Reaction Development and Application to Targets of Interest. Org Lett 2020; 22:666-669. [PMID: 31909622 PMCID: PMC7054899 DOI: 10.1021/acs.orglett.9b04453] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A catalytic conjunctive cross-coupling reaction is developed that allows the construction of chiral organoboronic esters from alkylboron ate complexes and alkyl iodide electrophiles. The process occurs most efficiently with a Ni/Pybox-comprised catalyst and with an acenapthoquinone-derived boron ligand. Because of the broad functional group tolerance of this reaction, it can be a versatile tool for organic synthesis. Applications to the construction of (R)-coniine and (-)-indolizidine 209D are described.
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Affiliation(s)
- Seung Moh Koo
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Alex J. Vendola
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Sarah Noemi Momm
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - James P. Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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32
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Ma G, Chen C, Talukdar S, Zhao X, Lei C, Gong H. Metal catalyst-free photo-induced alkyl C–O bond borylation. Chem Commun (Camb) 2020; 56:10219-10222. [DOI: 10.1039/d0cc04776g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Tertiary alkyl boronates were prepared via the C–O bond borylation of the corresponding oxalates under catalyst-free/(DMF)2–B2cat2 initiated visible light-induced conditions.
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Affiliation(s)
- Guobin Ma
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Changzhou Chen
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Sangita Talukdar
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Xinluo Zhao
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Chuanhu Lei
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
| | - Hegui Gong
- Center for Supramolecular Chemistry and Catalysis, Department of Chemistry and Department of Physics and Institute for the Conservation of Cultural Heritage
- Shanghai University
- Shanghai 200444
- China
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33
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Aparece MD, Hu W, Morken JP. Catalytic Enantioselective Synthesis of β-Allenyl Boronic Esters by Conjunctive Cross-Coupling with Propargylic Carbonates. ACS Catal 2019; 9:11381-11385. [PMID: 33692912 DOI: 10.1021/acscatal.9b04453] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantioselective conjunctive cross-coupling with propargylic carbonates affords (β-boryl allenes as the reaction product. The reaction is found to proceed through the intermediacy of dimethoxyboronate complexes that are generated in situ by a strain-induced ligand exchange reaction.
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Affiliation(s)
- Mark D. Aparece
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Weipeng Hu
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - James P. Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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34
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Chierchia M, Xu P, Lovinger GJ, Morken JP. Enantioselective Radical Addition/Cross-Coupling of Organozinc Reagents, Alkyl Iodides, and Alkenyl Boron Reagents. Angew Chem Int Ed Engl 2019; 58:14245-14249. [PMID: 31390474 PMCID: PMC6764867 DOI: 10.1002/anie.201908029] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/06/2019] [Indexed: 11/06/2022]
Abstract
A hybrid transition-metal/radical process is described that results in the addition of organozinc reagents and alkyl halides across alkenyl boron reagents in an enantioselective catalytic fashion. The reaction can be accomplished both intermolecularly and intramolecularly, providing useful product yields and high enantioselectivities in both manifolds.
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Affiliation(s)
- Matteo Chierchia
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Peilin Xu
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Gabriel J Lovinger
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - James P Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
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35
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Wang D, Mück-Lichtenfeld C, Studer A. Hydrogen Atom Transfer Induced Boron Retaining Coupling of Organoboronic Esters and Organolithium Reagents. J Am Chem Soc 2019; 141:14126-14130. [PMID: 31454481 PMCID: PMC6756585 DOI: 10.1021/jacs.9b07960] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
![]()
α-Functionalization
of alkyl boronic esters and homologation
of aryl boronic esters by regioselective radical C(sp3)–H activation in boron-ate complexes
is reported. Reaction of commercial or readily accessed aryl boronic
acid pinacol esters with alkyl lithium reagents provides boron-ate
complexes. Selective α-C–H abstraction by in situ generated
trifluoromethyl radicals leads to radical anions that undergo electron
transfer oxidation followed by 1,2-aryl/alkyl migration from boron
to carbon to give the α-arylated/alkylated alkyl boronic esters.
The valuable boronic ester functionality remains in the products and
the cheap trifluoromethyl iodide acts as the oxidant in these C–C
couplings. The 1,2-alkyl migration from boron to carbon is highly
stereospecific allowing access to stereoisomerically pure boronic
esters.
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Affiliation(s)
- Dinghai Wang
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
| | - Armido Studer
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität , Corrensstraße 40 , 48149 Münster , Germany
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36
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Chierchia M, Xu P, Lovinger GJ, Morken JP. Enantioselective Radical Addition/Cross‐Coupling of Organozinc Reagents, Alkyl Iodides, and Alkenyl Boron Reagents. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201908029] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Matteo Chierchia
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Peilin Xu
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Gabriel J. Lovinger
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - James P. Morken
- Department of Chemistry Boston College 2609 Beacon Street Chestnut Hill MA 02467 USA
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37
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Chen LA, Lear AR, Gao P, Brown MK. Nickel-Catalyzed Arylboration of Alkenylarenes: Synthesis of Boron-Substituted Quaternary Carbons and Regiodivergent Reactions. Angew Chem Int Ed Engl 2019; 58:10956-10960. [PMID: 31250959 PMCID: PMC6663602 DOI: 10.1002/anie.201904861] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Indexed: 12/19/2022]
Abstract
A method for the construction of boron-substituted quaternary carbons or diarylquaternary carbons by arylboration of highly substituted alkenylarenes is presented. A wide range of alkenes and arylbromides can participate in this reaction thus allowing for a diverse assortment of products to be prepared. In addition, a solvent dependent regiodivergent arylboration of 1,2-disubstituted alkenylarenes is presented, thus greatly increasing the scope of products that can be accessed.
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Affiliation(s)
- Liang-An Chen
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Alan R Lear
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
| | - Pin Gao
- Department of Chemistry, School of Science, Xi'an Key Laboratory of Sustainable Energy Material Chemistry, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China
| | - M Kevin Brown
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, IN, 47405, USA
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38
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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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39
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Namirembe S, Morken JP. Reactions of organoboron compounds enabled by catalyst-promoted metalate shifts. Chem Soc Rev 2019; 48:3464-3474. [PMID: 31062812 PMCID: PMC7053661 DOI: 10.1039/c9cs00180h] [Citation(s) in RCA: 143] [Impact Index Per Article: 28.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This tutorial review describes recent developments in catalytic reaction design that involve catalyst-promoted 1,2-metalate shifts as a critical part of the reaction mechanism. Issues pertaining to catalysis, stereoselectivity, and reaction mechanism are discussed.
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Affiliation(s)
- Sheila Namirembe
- Department of Chemistry, Boston College, Chestnut Hill, MA 02467, USA.
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40
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Chen L, Lear AR, Gao P, Brown MK. Nickel‐Catalyzed Arylboration of Alkenylarenes: Synthesis of Boron‐Substituted Quaternary Carbons and Regiodivergent Reactions. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904861] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Liang‐An Chen
- Department of ChemistryIndiana University 800 E. Kirkwood Ave. Bloomington IN 47405 USA
| | - Alan R. Lear
- Department of ChemistryIndiana University 800 E. Kirkwood Ave. Bloomington IN 47405 USA
| | - Pin Gao
- Department of ChemistrySchool of ScienceXi'an Key Laboratory of Sustainable Energy Material ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - M. Kevin Brown
- Department of ChemistryIndiana University 800 E. Kirkwood Ave. Bloomington IN 47405 USA
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41
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Zhao B, Li Z, Wu Y, Wang Y, Qian J, Yuan Y, Shi Z. An Olefinic 1,2‐Boryl‐Migration Enabled by Radical Addition: Construction of
gem
‐Bis(boryl)alkanes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903721] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Binlin Zhao
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
| | - Zexian Li
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
| | - Yixiao Wu
- College of Chemistry and Chemical EngineeringYangzhou University Yangzhou 225002 China
| | - Yandong Wang
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
| | - Jiasheng Qian
- College of Chemistry and Chemical EngineeringYangzhou University Yangzhou 225002 China
| | - Yu Yuan
- College of Chemistry and Chemical EngineeringYangzhou University Yangzhou 225002 China
| | - Zhuangzhi Shi
- State Key Laboratory of Coordination ChemistrySchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 China
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42
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Zhao B, Li Z, Wu Y, Wang Y, Qian J, Yuan Y, Shi Z. An Olefinic 1,2-Boryl-Migration Enabled by Radical Addition: Construction of gem-Bis(boryl)alkanes. Angew Chem Int Ed Engl 2019; 58:9448-9452. [PMID: 31058401 DOI: 10.1002/anie.201903721] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 04/20/2019] [Indexed: 12/11/2022]
Abstract
A series of in situ formed alkenyl diboronate complexes from alkenyl Grignard reagents (commercially available or prepared from alkenyl bromides and Mg) with B2 Pin2 (bis(pinacolato)diboron) react with diverse alkyl halides by a Ru photocatalyst to give various gem-bis(boryl)alkanes. Alkyl radicals add efficiently to the alkenyl diboronate complexes, and the adduct radical anions undergo radical-polar crossover, specifically, a 1,2-boryl-anion shift from boron to the α-carbon sp2 center. This transformation shows good functional-group compatibility and can serve as a powerful synthetic tool for late-stage functionalization in complex compounds. Measurements of the quantum yield reveal that a radical-chain mechanism is operative in which the alkenyl diboronates acts as reductive quencher for the excited state of the photocatalyst.
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Affiliation(s)
- Binlin Zhao
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Zexian Li
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Yixiao Wu
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China
| | - Yandong Wang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Jiasheng Qian
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China
| | - Yu Yuan
- College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China
| | - Zhuangzhi Shi
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
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43
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Law C, Meng Y, Koo SM, Morken JP. Catalytic Conjunctive Coupling of Carboxylic Acid Derivatives with 9-BBN-Derived Ate Complexes. Angew Chem Int Ed Engl 2019; 58:6654-6658. [PMID: 30893498 PMCID: PMC6502666 DOI: 10.1002/anie.201901927] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Indexed: 12/14/2022]
Abstract
β-Boryl carbonyl compounds are produced by a Ni-catalyzed cross-coupling of vinylboron "ate" complexes and acid chloride or acid anhydride electrophiles. The reactions are efficient, being complete in as little as two minutes, and can be applied to a broad range of substrates.
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Affiliation(s)
- Chunyin Law
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Yan Meng
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - Seung Moh Koo
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
| | - James P Morken
- Department of Chemistry, Boston College, 2609 Beacon Street, Chestnut Hill, MA, 02467, USA
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44
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Law C, Meng Y, Koo SM, Morken JP. Catalytic Conjunctive Coupling of Carboxylic Acid Derivatives with 9‐BBN‐Derived Ate Complexes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901927] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Chunyin Law
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Yan Meng
- Department of ChemistryBoston College 2609 Beacon Street Chestnut Hill MA 02467 USA
| | - Seung Moh Koo
- 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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45
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Carreras J, Caballero A, Pérez PJ. Alkenyl Boronates: Synthesis and Applications. Chem Asian J 2019; 14:329-343. [DOI: 10.1002/asia.201801559] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 12/11/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Javier Carreras
- Departamento de Química Orgánica y Química InorgánicaUniversidad de Alcalá (IQAR) 28805-Alcalá de Henares Madrid Spain
| | - Ana Caballero
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de QuímicaUniversidad de Huelva 21007- Huelva Spain
| | - Pedro J. Pérez
- Laboratorio de Catálisis Homogénea, Unidad Asociada al CSIC CIQSO-Centro de Investigación en Química Sostenible and Departamento de QuímicaUniversidad de Huelva 21007- Huelva Spain
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46
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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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47
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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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48
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Tao Z, Robb KA, Panger JL, Denmark SE. Enantioselective, Lewis Base-Catalyzed Carbosulfenylation of Alkenylboronates by 1,2-Boronate Migration. J Am Chem Soc 2018; 140:15621-15625. [PMID: 30411878 DOI: 10.1021/jacs.8b10288] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A catalytic, enantioselective method for the preparation of chiral, non-racemic, alkylboronic esters bearing two vicinal stereogenic centers is described. The reaction proceeds via a 1,2-migration of a zwitterionic thiiranium-boronate complex to give exclusively anti carbosulfenylation products. A broad scope of aryl groups migrate with good yield and excellent enantioselectivity (up to 99:1 e.r.). Similarly, a range of di- and trisubstituted alkenylboronic esters are competent reaction partners. This method provides access to both secondary and tertiary chiral alkylboronic esters.
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Affiliation(s)
- Zhonglin Tao
- Roger Adams Laboratory, Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States
| | - Kevin A Robb
- Roger Adams Laboratory, Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States
| | - Jesse L Panger
- Roger Adams Laboratory, Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States
| | - Scott E Denmark
- Roger Adams Laboratory, Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States
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49
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Myhill JA, Wilhelmsen CA, Zhang L, Morken JP. Diastereoselective and Enantioselective Conjunctive Cross-Coupling Enabled by Boron Ligand Design. J Am Chem Soc 2018; 140:15181-15185. [PMID: 30376317 DOI: 10.1021/jacs.8b09909] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Enantio- and diastereoselective conjunctive cross-coupling of β-substituted alkenylboron "ate" complexes is studied. Whereas β-substitution shifts the chemoselectivity of the catalytic reaction in favor of the Suzuki-Miyaura product, use of a boronic ester ligand derived from acenaphthoquinone allows the process to favor the conjunctive product, even with substituted substrates.
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Affiliation(s)
- Jesse A Myhill
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Christopher A Wilhelmsen
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Liang Zhang
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - James P Morken
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
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50
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Chakrabarty S, Takacs JM. Phosphonate-Directed Catalytic Asymmetric Hydroboration: Delivery of Boron to the More Substituted Carbon, Leading to Chiral Tertiary Benzylic Boronic Esters. ACS Catal 2018; 8:10530-10536. [PMID: 31134137 DOI: 10.1021/acscatal.8b03591] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Phosphonate-directed catalytic asymmetric hydroboration (CAHB) of β-aryl/heteroaryl methylidenes and trisubstituted alkenes by pinacolborane enables facile access to functionalized, chiral tertiary benzylic boronic esters. Hydroboration is catalyzed by a chiral rhodium catalyst prepared in situ from a Rh(I)-precursor in combination with a simple TADDOL-derived chiral cyclic monophosphite in a 1:1 ratio. The regio- and stereochemistry arises from the combined effects of the relative disposition of the directing group to the alkene, the alkene substitution pattern, and the necessity of an aryl substituent attached to the alkene. A range of aryl and heteroaryl substituents can be accommodated, and for several chiral substrates, the reactions are efficiently catalyst-controlled enabling the choice of diastereomeric products as desired. Stereospecific transformations of the chiral boronic ester afford chiral phosphonates bearing a quaternary carbon stereocenter. The synthetic utility of the products is further demonstrated by α-oxidation of the phosphonate leading to hydroxy- and oxo-phosphonates; the latter readily undergo elimination/substitution reactions to unmask the phosphonate functionality with the formation of aldehydes, alcohols, esters, amides, acids and ketones.
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Affiliation(s)
- Suman Chakrabarty
- Department of Chemistry and Center for Integrated Biomolecular Communication, University of Nebraska—Lincoln, Lincoln, Nebraska 68588−0304, United States
| | - James M. Takacs
- Department of Chemistry and Center for Integrated Biomolecular Communication, University of Nebraska—Lincoln, Lincoln, Nebraska 68588−0304, United States
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