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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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Activation, Deactivation and Reversibility Phenomena in Homogeneous Catalysis: A Showcase based on the Chemistry of Rhodium/Phosphine Catalysts. Catalysts 2019. [DOI: 10.3390/catal9070582] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
In the present work, the rich chemistry of rhodium/phosphine complexes, which are applied as homogeneous catalysts to promote a wide range of chemical transformations, has been used to showcase how the in situ generation of precatalysts, the conversion of precatalysts into the actually active species, as well as the reaction of the catalyst itself with other components in the reaction medium (substrates, solvents, additives) can lead to a number of deactivation phenomena and thus impact the efficiency of a catalytic process. Such phenomena may go unnoticed or may be overlooked, thus preventing the full understanding of the catalytic process which is a prerequisite for its optimization. Based on recent findings both from others and the authors’ laboratory concerning the chemistry of rhodium/diphosphine complexes, some guidelines are provided for the optimal generation of the catalytic active species from a suitable rhodium precursor and the diphosphine of interest; for the choice of the best solvent to prevent aggregation of coordinatively unsaturated metal fragments and sequestration of the active metal through too strong metal–solvent interactions; for preventing catalyst poisoning due to irreversible reaction with the product of the catalytic process or impurities present in the substrate.
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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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Čubiňák M, Eigner V, Tobrman T. Bench-Stable Sulfoxide-Based Boronates: Preparation and Application in a Tandem Suzuki Reaction. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801000] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Marek Čubiňák
- Department of Organic Chemistry; University of Chemistry and Technology, Prague, Technická 5; 166 28 Prague 6 Czech Republic
| | - Václav Eigner
- Institute of Physics AS CR, v.v.i., Na Slovance 2; 182 21 Prague 8 Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry; University of Chemistry and Technology, Prague, Technická 5; 166 28 Prague 6 Czech Republic
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Plasko DP, Jordan CJ, Ciesa BE, Merrill MA, Hanna JM. Visible light-promoted alkylation of imines using potassium organotrifluoroborates. Photochem Photobiol Sci 2018; 17:534-538. [PMID: 29722411 DOI: 10.1039/c8pp00061a] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mild, redox-neutral, alkylation of imines with potassium alkyltrifluoroborates is described. The reaction proceeds under photoredox conditions at ∼30 °C with primary, secondary, and tertiary alkyltrifluoroborates, leading to alkylation products in moderate to good yield in most cases. Aryl-, vinyl-, and cyclopropyltrifluoroborates failed to react under the reported conditions.
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Affiliation(s)
- Davis P Plasko
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733, USA.
| | - Christopher J Jordan
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733, USA.
| | - Brittney E Ciesa
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733, USA.
| | - Madison A Merrill
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733, USA.
| | - James M Hanna
- Department of Chemistry, Physics, and Geology, Winthrop University, Sims Science Building, Rock Hill, SC 29733, USA.
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Hollerbach MR, Barker TJ. Chemoselective Benzylation of Aldehydes Using Lewis Base Activated Boronate Nucleophiles. Organometallics 2018; 37:1425-1427. [PMID: 31680714 DOI: 10.1021/acs.organomet.8b00085] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A benzylation of aldehydes using primary and secondary benzylboronic acid pinacol esters is reported. Activation of the boronic ester with s-butyllithium rendered it nucleophilic toward aldehydes. The activated nucleophile chemoselectively transfers the benzyl group over the s-butyl group, providing excellent yields of the benzylated products. 11B NMR experiments were performed to study the mechnism of this transformation.
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Affiliation(s)
- Michael R Hollerbach
- Department of Chemistry and Biochemistry, College of Charleston, 66 George St., Charleston, South Carolina 29424 United States
| | - Timothy J Barker
- Department of Chemistry and Biochemistry, College of Charleston, 66 George St., Charleston, South Carolina 29424 United States
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Qian XW, Xue ZJ, Zhao Q, Cui Z, Chen YJ, Feng CG, Lin GQ. Enantioselective Rhodium-Catalyzed Alkenylation of Aliphatic Imines. Org Lett 2017; 19:5601-5604. [DOI: 10.1021/acs.orglett.7b02737] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xue-Wei Qian
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
| | - Ze-Jian Xue
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
| | - Qian Zhao
- Jiangsu
Key Laboratory of Chiral Drug Development, Jiangsu Aosaikang Pharmaceutical Co., Ltd., Nanjing, Jiangsu 211112, P.R. China
| | - Zhe Cui
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
| | - Ya-Jing Chen
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
| | - Chen-Guo Feng
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
- Jiangsu
Key Laboratory of Chiral Drug Development, Jiangsu Aosaikang Pharmaceutical Co., Ltd., Nanjing, Jiangsu 211112, P.R. China
| | - Guo-Qiang Lin
- Key
Laboratory of Synthetic Chemistry of Natural Substances, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, P.R. China
- Jiangsu
Key Laboratory of Chiral Drug Development, Jiangsu Aosaikang Pharmaceutical Co., Ltd., Nanjing, Jiangsu 211112, P.R. China
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Wei XH, Zhao LB, Zhou HC. Oxidative cross-coupling reaction by scandium catalysis for synthesis of α-alkyl α-amino acid ester derivatives. RSC Adv 2017. [DOI: 10.1039/c7ra00664k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A novel oxidative cross-coupling reaction between N-arylglycine esters and alkyl boronic acid esters was developed by scandium catalysis.
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Affiliation(s)
- Xiao-Hong Wei
- Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province
- College of Chemical Engineering
- Northwest University for Nationalities
- Lanzhou 730030
- P. R. China
| | - Lian-Biao Zhao
- Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province
- College of Chemical Engineering
- Northwest University for Nationalities
- Lanzhou 730030
- P. R. China
| | - Han-Cheng Zhou
- Key Laboratory for Utility of Environment-Friendly Composite Materials and Biomass in University of Gansu Province
- College of Chemical Engineering
- Northwest University for Nationalities
- Lanzhou 730030
- P. R. China
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Sandford C, Aggarwal VK. Stereospecific functionalizations and transformations of secondary and tertiary boronic esters. Chem Commun (Camb) 2017; 53:5481-5494. [DOI: 10.1039/c7cc01254c] [Citation(s) in RCA: 342] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This feature article discusses the range of stereospecific transformations available to enantioenriched boronic esters, and their applications in synthesis.
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Park J, Lee Y, Kim J, Cho SH. Copper-Catalyzed Diastereoselective Addition of Diborylmethane to N-tert-Butanesulfinyl Aldimines: Synthesis of β-Aminoboronates. Org Lett 2016; 18:1210-3. [DOI: 10.1021/acs.orglett.6b00376] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jinyoung Park
- Department of Chemistry and
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea
| | - Yeosan Lee
- Department of Chemistry and
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea
| | - Junghoon Kim
- Department of Chemistry and
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea
| | - Seung Hwan Cho
- Department of Chemistry and
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Republic of Korea
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