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Pujol M, Maza RJ, Salvado O, Carbó JJ, Fernández E. Site‐Selective (
Z
)‐α‐Borylalkenyl Copper Systems for Nucleophilic Stereodefined Allylic Coupling. Angew Chem Int Ed Engl 2022; 61:e202208495. [PMID: 35857816 PMCID: PMC9540588 DOI: 10.1002/anie.202208495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Indexed: 11/09/2022]
Abstract
1,1‐Diborylalkenes can be transformed into (Z)‐skipped dienes through CuI‐phosphine catalyzed allylic coupling reactions. The energetically preferred formation of (Z)‐α‐borylalkenyl copper (I) species and the subsequent nucleophilic attack, explains the stereoselective nucleophilic substitution with allyl bromides. The eventual treatment of (Z)‐skipped dienes with NaOtBu promotes cyclization/aromatization patterns via enyne intermediates.
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Affiliation(s)
- Mireia Pujol
- Department Química Física i Inorgànica Universitat Rovira i Virgili 43007 Tarragona Spain
| | - Ricardo J. Maza
- Department Química Física i Inorgànica Universitat Rovira i Virgili 43007 Tarragona Spain
| | - Oriol Salvado
- Department Química Física i Inorgànica Universitat Rovira i Virgili 43007 Tarragona Spain
| | - Jorge J. Carbó
- Department Química Física i Inorgànica Universitat Rovira i Virgili 43007 Tarragona Spain
| | - Elena Fernández
- Department Química Física i Inorgànica Universitat Rovira i Virgili 43007 Tarragona Spain
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2
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Pujol M, Maza RJ, Salvado O, Carbó JJ, Fernandez E. Site‐Selective (Z)‐α‐Borylalkenyl Copper Systems for Nucleophilic Stereodefined Allylic Coupling. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mireia Pujol
- Universitat Rovira i Virgili Química Física i Inorganica SPAIN
| | - Ricardo J. Maza
- Universitat Rovira i Virgili Química Física i Inorganica SPAIN
| | - Oriol Salvado
- Universitat Rovira i Virgili Química Física i Inorganica SPAIN
| | - Jorge J. Carbó
- Universitat Rovira i Virgili Química Física i Inorganica SPAIN
| | - Elena Fernandez
- University Rovira i Virgili Química Física i Inorgànica C/Marcelli Dominso s/n 43007 Tarragona SPAIN
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3
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Pearl ES, Fellner DMJ, Söhnel T, Furkert DP, Brimble MA. A Highly Efficient
N
‐Mesityl Thiazolylidene for the Aliphatic Stetter Reaction: Stereoelectronic Quantification for Comparison of N‐Heterocyclic Carbene Organocatalysts. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Esperanza S. Pearl
- School of Chemical Sciences The University of Auckland 23 Symonds St Auckland 1010 New Zealand
| | - Daniel M. J. Fellner
- School of Chemical Sciences The University of Auckland 23 Symonds St Auckland 1010 New Zealand
| | - Tilo Söhnel
- School of Chemical Sciences The University of Auckland 23 Symonds St Auckland 1010 New Zealand
| | - Daniel P. Furkert
- School of Chemical Sciences The University of Auckland 23 Symonds St Auckland 1010 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery 3 Symonds St Auckland 1010 New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences The University of Auckland 23 Symonds St Auckland 1010 New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery 3 Symonds St Auckland 1010 New Zealand
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4
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Liu HX, Ji F, Chen Y, Gao Y, Wang JK, Zhang MZ, Liu F, Sha Q. De Novo and Divergent Synthesis of Highly Functionalized Furans by Cascade Reactions of 2-Hydroxy-1,4-diones with Nucleophiles. Chemistry 2021; 27:5225-5229. [PMID: 33427337 DOI: 10.1002/chem.202005098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/17/2020] [Indexed: 11/10/2022]
Abstract
Herein, a divergent synthesis of a variety of 2α- and 5α-substituted furan derivatives from 2-hydroxy-1,4-diones is reported. By using appropriate substrates and an acid catalyst, the reactions occurred selectively through cyclization/1,6-conjugate addition or cyclization/Friedel-Crafts-type cascade reactions. A broad range of nucleophilic reagents (>10 types for the 1,6-conjugate addition for 5α substitution and >20 types for the Friedel-Crafts-type cascade reaction for 2α substitution), including alcohols, amides, furan, thiophene, pyrrole, indole, phenols, and many others, can successfully participate in the reactions, providing a universal strategy for a diversity-oriented synthesis of α-substituted furan derivatives. Deuteriation experiments and DFT calculations were carried out to support the proposed reaction mechanisms. Antifungal activity experiments revealed that products with an indole or 4-hydroxycoumarin core substituted at the 2α position showed moderate activities against Rhizoctorzia solani and Botrytis cinerea, respectively.
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Affiliation(s)
- Hai-Xuan Liu
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
| | - Fei Ji
- Department of Pharmaceutical Engineering, China Pharmaceutical University, 639 Longmian Avenue, Jiangning District, Nanjing, 211198, P.R. China
| | - Yu Chen
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P.R. China
| | - Ya Gao
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
| | - Jun-Ke Wang
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
| | - Ming-Zhi Zhang
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
| | - Fang Liu
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
| | - Qiang Sha
- Jiangsu Key Laboratory of Pesticide Science, and Department of, Chemistry, College of Sciences, Nanjing Agricultural University, 1 Weigang Road, Xuanwu District, Nanjing, 210095, P.R. China
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5
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Kumar N, Eghbarieh N, Stein T, Shames AI, Masarwa A. Photoredox-Mediated Reaction of gem-Diborylalkenes: Reactivity Toward Diverse 1,1-Bisborylalkanes. Chemistry 2020; 26:5360-5364. [PMID: 32141638 DOI: 10.1002/chem.202000603] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Indexed: 12/21/2022]
Abstract
The use of gem-diborylalkenes as radical-reactive groups is explored for the first time. These reactions provide an efficient and general method for the photochemical conversion of gem-diborylalkenes to rapidly access 1,1-bisborylalkanes. This method exploits a novel photoredox decarboxylative radical addition to gem-diborylalkenes to afford α-gem-diboryl carbon-centered radicals, which benefit from additional stability by virtue of an interaction with the empty p-orbitals on borons. The reaction offers a highly modular and regioselective approach to γ-amino gem-diborylalkanes. Furthermore, EPR spectroscopy and DFT calculations have provided insight into the radical mechanism underlying the photochemistry reaction and the stability of the bis-metalated radicals, respectively.
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Affiliation(s)
- Nivesh Kumar
- Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, 9190401, Israel
| | - Nadim Eghbarieh
- Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, 9190401, Israel
| | - Tamar Stein
- Fritz Haber Center for Molecular Dynamics Research, Institute of Chemistry, The Hebrew University Jerusalem, Jerusalem, 91904, Israel
| | - Alexander I Shames
- Physics Department, Ben-Gurion University of the Negev, 8410501, Be'er Sheva, Israel
| | - Ahmad Masarwa
- Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, Jerusalem, 9190401, Israel
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