1
|
Rajendran NM, Lu Q, Bouffard J. A Facile Preparation of N-Heterocyclic Olefins: Ring-Opening Polymerization of β-Butyrolactone and Frustrated Lewis Pair Reactivity. Chemistry 2024; 30:e202303358. [PMID: 38109087 DOI: 10.1002/chem.202303358] [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: 10/12/2023] [Indexed: 12/19/2023]
Abstract
A direct synthesis of N-heterocyclic olefins (NHOs) and their mesoionic congeners (mNHOs) from N-heterocyclic carbenes and N-aziridinylimines is reported. The reaction provided diverse functionalized (m)NHOs and π-extended analogues. The prepared NHOs initiated the ring-opening polymerization of β-butyrolactone, and insertion of aldehyde and nitrile into an NHO-B(C6 F5 )3 adduct was demonstrated.
Collapse
Affiliation(s)
| | - Qi Lu
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Korea
| | - Jean Bouffard
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Korea
| |
Collapse
|
2
|
Das M, Hogan C, Zielinski R, Kubicki M, Koy M, Kosbab C, Brozzesi S, Das A, Nehring MT, Balfanz V, Brühne J, Dähne M, Franz M, Esser N, Glorius F. N-Heterocyclic Olefins on a Silicon Surface. Angew Chem Int Ed Engl 2023; 62:e202314663. [PMID: 37849449 DOI: 10.1002/anie.202314663] [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: 07/05/2023] [Revised: 10/13/2023] [Accepted: 10/17/2023] [Indexed: 10/19/2023]
Abstract
The adsorption of N-heterocyclic olefins (NHOs) on silicon is investigated in a combined scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory study. We find that both of the studied NHOs bind covalently, with ylidic character, to the silicon adatoms of the substrate and exhibit good thermal stability. The adsorption geometry strongly depends on the N-substituents: for large N-substituents, an upright adsorption geometry is favored, while a flat-lying geometry is found for the NHO with smaller wingtips. These different geometries strongly influence the quality and properties of the obtained monolayers. The upright geometry leads to the formation of ordered monolayers, whereas the flat-lying NHOs yield a mostly disordered, but denser, monolayer. The obtained monolayers both show large work function reductions, as the higher density of the flat-lying monolayer is found to compensate for the smaller vertical dipole moments. Our findings offer new prospects in the design of tailor-made ligand structures in organic electronics and optoelectronics, catalysis, and material science.
Collapse
Affiliation(s)
- Mowpriya Das
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149, Münster, Germany
| | - Conor Hogan
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via del Fosso del Cavaliere 100, 00133, Rome, Italy
- Dipartimento di Fisica, Università di Roma 'Tor Vergata', Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Robert Zielinski
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Milan Kubicki
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Maximilian Koy
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149, Münster, Germany
| | - Canan Kosbab
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Simone Brozzesi
- Dipartimento di Fisica, Università di Roma 'Tor Vergata', Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Ankita Das
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149, Münster, Germany
| | - Mike Thomas Nehring
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Viktoria Balfanz
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Juls Brühne
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Mario Dähne
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Martin Franz
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
| | - Norbert Esser
- Technische Universität Berlin, Institut für Festkörperphysik, Hardenbergstrasse 36, D-10623, Berlin, Germany
- Leibniz-Institut für Analytische Wissenschaften - ISAS e.V., Schwarzschildstrasse 8, 12489, Berlin, Germany
| | - Frank Glorius
- Westfälische Wilhelms-Universität Münster, Organisch-Chemisches Institut, Corrensstrasse 40, 48149, Münster, Germany
| |
Collapse
|
3
|
Nakata M, Hirashita T, Konishi Y, Araki S. Synthesis of stable class 5 mesoionic benzo[ c]tetrazolo[2,3- a]cinnolinium thiolate, dicyanomethylide, and amides. Org Biomol Chem 2023; 21:4282-4289. [PMID: 37158001 DOI: 10.1039/d3ob00362k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Although class 5 mesoionic compounds show interesting electrical behaviour, they are generally unstable, readily undergoing ring-opening reactions. We designed and synthesized a bridged mesoionic derivative, benzo[c]tetrazolo[2,3-a]cinolinium (BTC), as a stable class 5 mesoionic compound, which was further transformed to the corresponding thiolate, cicyanomethylide, and amide. The intramolecular bridging imparted stability to the BTC thiolates and amides: the BTC thiolates were unsusceptible to ring-opening at high temperatures, and the BTC amides were stable in the absence of electron-withdrawing groups on the amide nitrogen. The properties of the BTC thiolate were compared with those of 2,3-diphenyltetrazolium derivatives based on UV-Vis absorption spectroscopy, single-crystal X-ray diffraction and quantum calculations.
Collapse
Affiliation(s)
- Mirai Nakata
- Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
| | - Tsunehisa Hirashita
- Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
| | - Yoshikazu Konishi
- Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
| | - Shuki Araki
- Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan.
| |
Collapse
|
4
|
Wang S, Zhang C, Li D, Zhou Y, Su Z, Feng X, Dong S. New chiral N-heterocyclic olefin bifunctional organocatalysis in α-functionalization of β-ketoesters. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1458-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
5
|
Wu T, Tatton MR, Greaney MF. NHC Catalysis for Umpolung Pyridinium Alkylation via Deoxy-Breslow Intermediates. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 134:e202117524. [PMID: 38504766 PMCID: PMC10947523 DOI: 10.1002/ange.202117524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Indexed: 11/09/2022]
Abstract
Umpolung N-heterocyclic carbene (NHC) catalysis of non-aldehyde substrates offers new pathways for C-C bond formation, but has proven challenging to develop in terms of viable substrate classes. Here, we demonstrate that pyridinium ions can undergo NHC addition and subsequent intramolecular C-C bond formation through a deoxy-Breslow intermediate. The alkylation demonstrates, for the first time, that deoxy-Breslow intermediates are viable for catalytic umpolung of areniums.
Collapse
Affiliation(s)
- Terence Wu
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Matthew R. Tatton
- Early Chemical DevelopmentPharmaceutical SciencesR&D, AstraZenecaMacclesfieldSK10 2NAUK
| | - Michael F. Greaney
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| |
Collapse
|
6
|
Wu T, Tatton MR, Greaney MF. NHC Catalysis for Umpolung Pyridinium Alkylation via Deoxy-Breslow Intermediates. Angew Chem Int Ed Engl 2022; 61:e202117524. [PMID: 35103381 PMCID: PMC9306516 DOI: 10.1002/anie.202117524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Indexed: 12/24/2022]
Abstract
Umpolung N-heterocyclic carbene (NHC) catalysis of non-aldehyde substrates offers new pathways for C-C bond formation, but has proven challenging to develop in terms of viable substrate classes. Here, we demonstrate that pyridinium ions can undergo NHC addition and subsequent intramolecular C-C bond formation through a deoxy-Breslow intermediate. The alkylation demonstrates, for the first time, that deoxy-Breslow intermediates are viable for catalytic umpolung of areniums.
Collapse
Affiliation(s)
- Terence Wu
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| | - Matthew R. Tatton
- Early Chemical DevelopmentPharmaceutical SciencesR&D, AstraZenecaMacclesfieldSK10 2NAUK
| | - Michael F. Greaney
- School of ChemistryThe University of ManchesterOxford RoadManchesterM13 9PLUK
| |
Collapse
|
7
|
Ghanbari H, Robertson KN, Clyburne J, Soleimani E. Betaine formation from the reactions of N-heterocyclic carbenes with polarized alkenes. CAN J CHEM 2021. [DOI: 10.1139/cjc-2021-0234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
N-heterocyclic carbenes [1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene 1a (IMes) or 1,3-bis(2,6-di-iso-propylphenyl)imidazolidene 1b (SIPr)] react with the polarized alkenes 2 and 4 to form the crystalline betaines 3a, 3b and 5a. Furthermore, a one-pot reaction between an aldehyde, malonitrile, and an imidazolium salt of an N-heterocyclic carbene has been developed for the efficient preparation of betaine 5a without isolation of the free carbene. Full characterization data, including X-ray crystal structures, is reported for the three synthesized betaines. The structures of the betaines 3a, 3b and 5a shed new light on the initial products formed in the reactions between N-heterocyclic carbenes and compounds containing polarized double bonds.
Collapse
Affiliation(s)
- Hamed Ghanbari
- Razi University, 48494, Department of Chemistry, Kermanshah, Iran (the Islamic Republic of)
| | - Katherine N. Robertson
- Saint Mary's University, Chemistry, 923 Robie Street, Halifax, Nova Scotia, Canada, B3H 3C3
| | - Jason Clyburne
- Saint Mary’s University, Department of Chemistry, Halifax, Canada, B3H 3C3
| | - Ebrahim Soleimani
- Razi University, 48494, Department of Chemistry, Kermanshah, Iran (the Islamic Republic of)
- Saint Mary’s University, Department of Chemistry, Halifax, Canada, B3H 3C3
- Dalhousie University, 3688, Department of Chemistry, Halifax, Canada, B3H 4R2
| |
Collapse
|
8
|
Kundu A, Chandra S, Mandal D, Neuman NI, Mahata A, Anga S, Rawat H, Pal S, Schulzke C, Sarkar B, Chandrasekhar V, Jana A. Twisted Push-Pull Alkenes Bearing Geminal Cyclicdiamino and Difluoroaryl Substituents. J Org Chem 2021; 86:12683-12692. [PMID: 34473501 DOI: 10.1021/acs.joc.1c01201] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The systematic combination of N-heterocyclic olefins (NHOs) with fluoroarenes resulted in twisted push-pull alkenes. These alkenes carry electron-donating cyclicdiamino substituents and two electron-withdrawing fluoroaryl substituents in the geminal positions. The synthetic method can be extended to a variety of substituted push-pull alkenes by varying the NHO as well as the fluoroarenes. Solid-state molecular structures of these molecules reveal a notable elongation of the central C-C bond and a twisted geometry in the alkene motif. Absorption properties were investigated with UV-vis spectroscopy. The redox properties of the twisted push-pull alkenes were probed with electrochemistry as well as UV-vis/NIR and EPR spectroelectrochemistry, while the electronic structures were computationally evaluated and validated.
Collapse
Affiliation(s)
- Abhinanda Kundu
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Shubhadeep Chandra
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Debdeep Mandal
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Nicolás I Neuman
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany.,Instituto de Desarrollo Tecnológico para la Industria Química, CCT Santa Fe CONICET-UNL, Colectora Ruta Nacional 168, Paraje El Pozo, 3000 Santa Fe, Argentina
| | - Alok Mahata
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Srinivas Anga
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Hemant Rawat
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Sudip Pal
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| | - Carola Schulzke
- Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Straße 4, D-17489 Greifswald, Germany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische Koordinationschemie, Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | | | - Anukul Jana
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500046, Telangana, India
| |
Collapse
|
9
|
Shyam A, Pradhan AK, Mondal P. A density functional theory investigation on bis(diethylamino)cyclopropenylidene catalyzed synthesis of 1,4‐bifunctional compounds. J PHYS ORG CHEM 2021. [DOI: 10.1002/poc.4219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Abhijit Shyam
- Department of Chemistry Assam University Silchar India
| | | | | |
Collapse
|
10
|
Gupta P, Siewert JE, Wellnitz T, Fischer M, Baumann W, Beweries T, Hering-Junghans C. Reactivity of phospha-Wittig reagents towards NHCs and NHOs. Dalton Trans 2021; 50:1838-1844. [PMID: 33471018 DOI: 10.1039/d1dt00071c] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Phospha-Wittig reagents, RPPMe3 (R = Mes* 2,4,6-tBu3-C6H2; MesTer 2,6-(2,4,6-Me3C6H2)-C6H3; DipTer 2,6-(2,6-iPr2C6H3)-C6H3), can be considered as phosphine-stabilized phosphinidenes. In this study we show that PMe3 can be displaced by NHCs or NHOs. Interestingly, phosphinidene-like reactivity results in a subsequent C(sp2)-H activation of the exocyclic CH2 group in NHOs. This concept was further extended to allyl-apended NHOs, which resulted in phosphine-substituted allyl species.
Collapse
Affiliation(s)
- Priyanka Gupta
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Jan-Erik Siewert
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Tim Wellnitz
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Malte Fischer
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Wolgang Baumann
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Torsten Beweries
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| | - Christian Hering-Junghans
- Leibniz-Institut für Katalyse e.V. (LIKAT Rostock), Albert-Einstein-Straße 29a, 18059 Rostock, Germany.
| |
Collapse
|
11
|
Tan H, Wang S, Yan Z, Liu J, Wei J, Song S, Jiao N. N‐Heterocyclic Carbene Catalyzed Ester Synthesis from Organic Halides through Incorporation of Oxygen Atoms from Air. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011039] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hui Tan
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Shen‐An Wang
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Zixi Yan
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Jianzhong Liu
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Jialiang Wei
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Song Song
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
- State Key Laboratory of Organometallic Chemistry Chinese Academy of Sciences Shanghai 200032 China
| |
Collapse
|
12
|
Tan H, Wang S, Yan Z, Liu J, Wei J, Song S, Jiao N. N‐Heterocyclic Carbene Catalyzed Ester Synthesis from Organic Halides through Incorporation of Oxygen Atoms from Air. Angew Chem Int Ed Engl 2020; 60:2140-2144. [DOI: 10.1002/anie.202011039] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/23/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Hui Tan
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Shen‐An Wang
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Zixi Yan
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Jianzhong Liu
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Jialiang Wei
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Song Song
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Xue Yuan Rd. 38 Beijing 100191 China
- State Key Laboratory of Organometallic Chemistry Chinese Academy of Sciences Shanghai 200032 China
| |
Collapse
|
13
|
Shyam A, Pradhan AK, Mondal P. Mechanistic Insights into the N‐Heterocyclic Carbene Catalyzed Synthesis of α,δ‐Diketones: A DFT Approach. ChemistrySelect 2020. [DOI: 10.1002/slct.202002811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Abhijit Shyam
- Department of Chemistry Assam University Silchar 788011, Assam India
| | - Amit K. Pradhan
- Department of Chemistry Assam University Silchar 788011, Assam India
| | - Paritosh Mondal
- Department of Chemistry Assam University Silchar 788011, Assam India
| |
Collapse
|
14
|
B S A, Bhattacharjee R, Gupta S, Ahammad S, Datta A, Kundu S. Deoxygenation of nitrosoarene by N-heterocyclic carbene (NHC): an elusive Breslow-type intermediate bridging carbene and nitrene. Chem Commun (Camb) 2020; 56:12166-12169. [PMID: 32909566 DOI: 10.1039/d0cc05192f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Heterocyclic carbene (NHC) activates and deoxygenates nitrosoarene (ArNO) to afford arylnitrene (ArN), thereby portraying a fundamental route connecting two 6e- species. A combination of spectroscopic and computational studies suggests that the interaction of ArNO with NHC affords a transient 2,2'-diamino imine-N-oxide as a key intermediate in ArNO deoxygenation.
Collapse
Affiliation(s)
- Anju B S
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram - 695551, India.
| | - Rameswar Bhattacharjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur - 700032, Kolkata, India.
| | - Shourya Gupta
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram - 695551, India.
| | - Soniya Ahammad
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram - 695551, India.
| | - Ayan Datta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur - 700032, Kolkata, India.
| | - Subrata Kundu
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram - 695551, India.
| |
Collapse
|
15
|
Zhang Z, Huang S, Huang L, Xu X, Zhao H, Yan X. Synthesis of Mesoionic N-Heterocyclic Olefins and Catalytic Application for Hydroboration Reactions. J Org Chem 2020; 85:12036-12043. [DOI: 10.1021/acs.joc.0c00257] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Zengyu Zhang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Shiqing Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Linwei Huang
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xingyu Xu
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Hongyan Zhao
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| | - Xiaoyu Yan
- Department of Chemistry, Renmin University of China, Beijing 100872, China
| |
Collapse
|
16
|
Hansmann MM, Antoni PW, Pesch H. Stable Mesoionic N-Heterocyclic Olefins (mNHOs). Angew Chem Int Ed Engl 2020; 59:5782-5787. [PMID: 31863704 PMCID: PMC7154647 DOI: 10.1002/anie.201914571] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/16/2019] [Indexed: 01/07/2023]
Abstract
We report a new class of stable mesoionic N-heterocyclic olefins, featuring a highly polarized (strongly ylidic) double bond. The ground-state structure cannot be described through an uncharged mesomeric Lewis-structure, thereby structurally distinguishing them from traditional N-heterocyclic olefins (NHOs). mNHOs can easily be obtained through deprotonation of the corresponding methylated N,N'-diaryl-1,2,3-triazolium and N,N'-diaryl-imidazolium salts, respectively. In their reactivity, they represent strong σ-donor ligands as shown by their coordination complexes of rhodium and boron. Their calculated proton affinities, their experimentally derived basicities (competition experiments), as well as donor abilities (Tolman electronic parameter; TEP) exceed the so far reported class of NHOs.
Collapse
Affiliation(s)
- Max M. Hansmann
- Fakultät für Chemie und Chemische BiologieTechnische Universität DortmundOtto-Hahn-Str. 644227DortmundGermany
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| | - Patrick W. Antoni
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| | - Henner Pesch
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| |
Collapse
|
17
|
Shyam A, Mondal P. Theoretical Insight towards Mechanism, Role of NHC and DBU in the Synthesis of Substituted Quinolines. ChemistrySelect 2020. [DOI: 10.1002/slct.201903697] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Abhijit Shyam
- Department of ChemistryAssam University, Silchar, Silchar Assam 788011 India
| | - Paritosh Mondal
- Department of ChemistryAssam University, Silchar, Silchar Assam 788011 India
| |
Collapse
|
18
|
Hansmann MM, Antoni PW, Pesch H. Stable Mesoionic N‐Heterocyclic Olefins (mNHOs). Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914571] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Max M. Hansmann
- Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Str. 6 44227 Dortmund Germany
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| | - Patrick W. Antoni
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| | - Henner Pesch
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| |
Collapse
|
19
|
Satyam K, Harish B, Nanubolu JB, Suresh S. N-Heterocyclic carbene (NHC)-catalyzed tandem imine umpolung–aza-Michael addition–oxidation of β-carboline cyclic imines. Chem Commun (Camb) 2020; 56:2803-2806. [DOI: 10.1039/d0cc00321b] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Heterocyclic carbene (NHC)-catalyzed tandem imine umpolung–aza-Michael addition–oxidation of cyclic imines for the synthesis of a wide range of biologically relevant β-carboline-1-one derivatives has been disclosed.
Collapse
Affiliation(s)
- Killari Satyam
- Department of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Battu Harish
- Department of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Jagadeesh Babu Nanubolu
- Laboratory of X-Ray Crystallography
- Department of Analytical Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007
- India
| | - Surisetti Suresh
- Department of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500 007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| |
Collapse
|
20
|
Nguyen XB, Nakano Y, Lupton DW. Polarity Inversion Catalysis by the 1,4-Addition of N-Heterocyclic Carbenes. Aust J Chem 2020. [DOI: 10.1071/ch19550] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Polarity inversion is the hallmark of N-heterocyclic carbene (NHC) organocatalysis, with the generation and reaction of acyl anion equivalents known for more than 70 years. In contrast, polarity inversion through 1,4-addition of NHCs to conjugate acceptors was first applied in a catalytic reaction in 2006. This sub-field of NHC-organocatalysis has developed steadily over the subsequent years, enabling novel coupling reactions, enantioselective cycloisomerizations, polymerizations, and other reactions. In this review, this emerging area of NHC-organocatalysis is discussed with comprehensive coverage. In addition, notes regarding the use of other Lewis base catalysts for related reactions, and comments regarding NHC selection for this type of catalysis, are provided.
Collapse
|
21
|
Nguyen XB, Nakano Y, Duggan NM, Scott L, Breugst M, Lupton DW. N‐Heterocyclic Carbene Catalyzed (5+1) Annulations Exploiting a Vinyl Dianion Synthon Strategy. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905475] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xuan B. Nguyen
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | | | - Lydia Scott
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Martin Breugst
- Department für Chemie Universität zu Köln Greinstraße 4 50939 Köln Germany
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
22
|
Nguyen XB, Nakano Y, Duggan NM, Scott L, Breugst M, Lupton DW. N‐Heterocyclic Carbene Catalyzed (5+1) Annulations Exploiting a Vinyl Dianion Synthon Strategy. Angew Chem Int Ed Engl 2019; 58:11483-11490. [DOI: 10.1002/anie.201905475] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Xuan B. Nguyen
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | | | - Lydia Scott
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Martin Breugst
- Department für Chemie Universität zu Köln Greinstraße 4 50939 Köln Germany
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
23
|
Watson IC, Schumann A, Yu H, Davy EC, McDonald R, Ferguson MJ, Hering‐Junghans C, Rivard E. N‐Heterocyclic Olefin‐Ligated Palladium(II) Complexes as Pre‐Catalysts for Buchwald–Hartwig Aminations. Chemistry 2019; 25:9678-9690. [DOI: 10.1002/chem.201901376] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Ian C. Watson
- Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - André Schumann
- Leibniz Institute for CatalysisUniversity of Rostock Albert Einstein Strasse 29a 18059 Rostock Germany
| | - Haoyang Yu
- Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Emma C. Davy
- Department of Physical SciencesQuest University 3200 University Boulevard Squamish British Columbia V8B 0N8 Canada
| | - Robert McDonald
- Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Michael J. Ferguson
- Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| | - Christian Hering‐Junghans
- Leibniz Institute for CatalysisUniversity of Rostock Albert Einstein Strasse 29a 18059 Rostock Germany
| | - Eric Rivard
- Department of ChemistryUniversity of Alberta 11227 Saskatchewan Drive Edmonton Alberta T6G 2G2 Canada
| |
Collapse
|
24
|
Charvieux A, Duc Vu N, Duguet N, Lemaire M. Valorization of Methyl Azelaaldehydate - A Vegetable Oil Based Platform Molecule for the Synthesis of Monomers through Stetter Reaction. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Aubin Charvieux
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Nam Duc Vu
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Nicolas Duguet
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| | - Marc Lemaire
- Univ Lyon, Université Claude Bernard Lyon1, CNRS, INSA, CPE-Lyon, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, ICBMS, UMR 5246, Equipe CAtalyse, SYnthèse et ENvironnement (CASYEN), Bâtiment Lederer; 1 rue Victor Grignard 69100 Villeurbanne cedex France
| |
Collapse
|
25
|
Patra A, James A, Das TK, Biju AT. Oxidative NHC Catalysis for the Generation of Imidoyl Azoliums: Synthesis of Benzoxazoles. J Org Chem 2018; 83:14820-14826. [DOI: 10.1021/acs.joc.8b02598] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atanu Patra
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Anjima James
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Tamal Kanti Das
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Akkattu T. Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| |
Collapse
|
26
|
Scott L, Nakano Y, Zhang C, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalyzed Cyclopentene Synthesis via the β‐Azolium Ylide. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804271] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lydia Scott
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Changhe Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
27
|
Scott L, Nakano Y, Zhang C, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalyzed Cyclopentene Synthesis via the β‐Azolium Ylide. Angew Chem Int Ed Engl 2018; 57:10299-10303. [DOI: 10.1002/anie.201804271] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 05/30/2018] [Indexed: 01/04/2023]
Affiliation(s)
- Lydia Scott
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Changhe Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
28
|
Patra A, Gelat F, Pannecoucke X, Poisson T, Besset T, Biju AT. Synthesis of 4-Difluoromethylquinolines by NHC-Catalyzed Umpolung of Imines. Org Lett 2018; 20:1086-1089. [DOI: 10.1021/acs.orglett.7b04055] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Atanu Patra
- Organic
Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi
Bhabha Road, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110020, India
| | - Fabien Gelat
- Normandie Université,
INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France
| | - Xavier Pannecoucke
- Normandie Université,
INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France
| | - Thomas Poisson
- Normandie Université,
INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France
- Institut Universitaire de France, 103 boulevard Saint-Michel, 75005 Paris, France
| | - Tatiana Besset
- Normandie Université,
INSA Rouen, UNIROUEN, CNRS, COBRA (UMR 6014), 76000 Rouen, France
| | - Akkattu T. Biju
- Organic
Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi
Bhabha Road, Pune 411008, India
| |
Collapse
|
29
|
Paisley NR, Lui MW, McDonald R, Ferguson MJ, Rivard E. Structurally versatile phosphine and amine donors constructed from N-heterocyclic olefin units. Dalton Trans 2018; 45:9860-70. [PMID: 26924395 DOI: 10.1039/c6dt00299d] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A general strategy for the synthesis of hindered N- and P-based donors is presented whereby the strongly electron releasing N-heterocyclic olefin (NHO) unit, IPr[double bond, length as m-dash]CH-, (IPr[double bond, length as m-dash]CH- = [(HCNDipp)2C[double bond, length as m-dash]CH](-); Dipp = 3,6-(i)Pr2C6H2) is linked to terminally bound phosphine and amine donors. Preliminary coordination chemistry is presented involving phosphine (IPr[double bond, length as m-dash]CH)PR2 (R = (i)Pr and Ph) and amine (IPr[double bond, length as m-dash]CH)NMe2 ligands and the Lewis acids BH3 and AuCl. Interestingly, (IPr[double bond, length as m-dash]CH)NMe2 binds AuCl through an exocyclic olefin unit, while the softer phosphorus centers in (IPr[double bond, length as m-dash]CH)PR2 coordinate to yield Au-P linkages; thus the reported NHO-based ligands exhibit tunable binding modes to metals.
Collapse
Affiliation(s)
- Nathan R Paisley
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada.
| | - Melanie W Lui
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada.
| | - Robert McDonald
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada.
| | - Michael J Ferguson
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada.
| | - Eric Rivard
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive, Edmonton, AB, T6G 2G2 Canada.
| |
Collapse
|
30
|
Das TK, Biju AT. A Method for the Analysis of Free Carbenes Present after NHC-Organocatalyzed Transformations. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700903] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tamal Kanti Das
- Organic Chemistry Division; CSIR National Chemical Laboratory; Dr. Homi Bhabha Road 411008 Pune Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR); 110020 New Delhi India
| | - Akkattu T. Biju
- Organic Chemistry Division; CSIR National Chemical Laboratory; Dr. Homi Bhabha Road 411008 Pune Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR); 110020 New Delhi India
| |
Collapse
|
31
|
Roy MMD, Rivard E. Pushing Chemical Boundaries with N-Heterocyclic Olefins (NHOs): From Catalysis to Main Group Element Chemistry. Acc Chem Res 2017; 50:2017-2025. [PMID: 28777537 DOI: 10.1021/acs.accounts.7b00264] [Citation(s) in RCA: 139] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
N-Heterocyclic olefins (NHOs) have gone from the topic of a few scattered (but important) reports in the early 1990s to very recently being a ligand/reagent of choice in the far-reaching research fields of organocatalysis, olefin and heterocycle polymerization, and low oxidation state main group element chemistry. NHOs are formally derived by appending an alkylidene (CR2) unit onto an N-heterocyclic carbene (NHC), and their pronounced ylidic character leads to high nucleophilicity and soft Lewis basic character at the ligating carbon atom. These olefinic donors can also be structurally derived from imidazole, triazole, and thiazole-based heterocyclic carbenes and, as a result, have highly tunable electronic and steric properties. In this Account, we will focus on various synthetic routes to imidazole-2-ylidene derived NHOs (sometimes referred to as deoxy-Breslow intermediates) followed by a discussion of the electron-donor ability of this structurally tunable ligand group. It should be mentioned that NHOs have a close structural analogy with Breslow-type intermediates, N-heterocyclic ketene aminals, and β-azolium ylides; while these latter species play important roles in advancing synthetic organic chemistry, discussion in this Account will be confined mostly to imidazole-2-ylidene derived NHOs. In addition, we will cover selected examples from the literature where NHOs and their anionic counterparts, N-heterocyclic vinylenes, are used to access reactive main group species not attainable using traditional ligands. Added motivation for these studies comes from the emerging number of low coordinate main group element based compounds that display reactivity once reserved for precious metal complexes (such as H-H and C-H bond activation). Moreover, NHOs are versatile precursors to new mixed element (P/C and N/C), and potentially bidentate, ligand constructs of great potential in catalysis, where various metal oxidation states and coordination environments need to be stabilized during a catalytic cycle. The most active area of recent growth for NHOs is their use as nucleophiles to promote efficient organocatalytic transformations, including transesterification, carbonyl reduction, and the conversion of CO2 into value added products. Polyesters have also been generated through the NHO-promoted ring-opening polymerization of lactones, and the highly tunable nature of NHO organocatalysts allows for the rapid screening and enhancement of catalytic performance. Therefore, the growing utility of NHOs in the realm of organic and polymer chemistry can be viewed as evidence of the widespread impact of N-heterocyclic olefins on the chemical community. It is hoped that through this Account others will join this flourishing research domain and that the rapid recent growth of NHO chemistry is sustained for the foreseeable future.
Collapse
Affiliation(s)
- Matthew M. D. Roy
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta Canada, T6G 2G2
| | - Eric Rivard
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta Canada, T6G 2G2
| |
Collapse
|
32
|
Wang G, Fu Z, Huang W. Access to Amide from Aldimine via Aerobic Oxidative Carbene Catalysis and LiCl as Cooperative Lewis Acid. Org Lett 2017; 19:3362-3365. [PMID: 28654279 DOI: 10.1021/acs.orglett.7b01195] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, an efficient route to amides from aldimines via aza-Breslow intermediates through aerobic oxidative carbene catalysis with LiCl as a cooperative Lewis acid is described. Many of the obtained N-heteroarylamides feature biological activity. Ambient air was used as the sole oxidant and source of oxygen in this catalytically oxidative amidation. This method allows for a broad substrate scope and mild conditions. The aza-Breslow intermediate derivative was isolated and its crystal structure confirmed.
Collapse
Affiliation(s)
- Guanjie Wang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University , 30 South Puzhu Road, Nanjing 211816, China
| | - Zhenqian Fu
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University , 30 South Puzhu Road, Nanjing 211816, China
| | - Wei Huang
- Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University , 30 South Puzhu Road, Nanjing 211816, China.,Key Laboratory for Organic Electronics and Information Displays, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications , 9 Wenyuan Road, Nanjing 210023, China
| |
Collapse
|
33
|
Zanatta M, dos Santos FP, Biehl C, Marin G, Ebeling G, Netz PA, Dupont J. Organocatalytic Imidazolium Ionic Liquids H/D Exchange Catalysts. J Org Chem 2017; 82:2622-2629. [DOI: 10.1021/acs.joc.6b03029] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcileia Zanatta
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Francisco P. dos Santos
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Cristina Biehl
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Graciane Marin
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Gunter Ebeling
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Paulo A. Netz
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
| | - Jairton Dupont
- Institute of Chemistry − UFRGS Av. Bento Gonçalves, 9500 Porto Alegre, RS, Agronomia 91501-970, Brazil
- School
of Chemistry, University of Nottingham University Park, Nottingham NG72RD, United Kingdom
| |
Collapse
|
34
|
Zhao M, Chen J, Yang H, Zhou L. N-Heterocyclic Carbene-Catalyzed Intramolecular Nucleophilic Substitution: Enantioselective Construction of All-Carbon Quaternary Stereocenters. Chemistry 2017; 23:2783-2787. [DOI: 10.1002/chem.201700198] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Indexed: 01/04/2023]
Affiliation(s)
- Ming Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education; Department of Chemistry and Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education; Department of Chemistry and Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Hui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education; Department of Chemistry and Materials Science; Northwest University; Xi'an 710127 P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education; Department of Chemistry and Materials Science; Northwest University; Xi'an 710127 P. R. China
| |
Collapse
|
35
|
Chong CC, Rao B, Ganguly R, Li Y, Kinjo R. Bis(N-heterocyclic olefin) Derivative: An Efficient Precursor for Isophosphindolylium Species. Inorg Chem 2017; 56:8608-8614. [DOI: 10.1021/acs.inorgchem.6b02991] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Che Chang Chong
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, and §NTU-CBC Crystallography
Facility, Nanyang Technological University (NTU), Singapore 637371, Singapore
| | - Bin Rao
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, and §NTU-CBC Crystallography
Facility, Nanyang Technological University (NTU), Singapore 637371, Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, and §NTU-CBC Crystallography
Facility, Nanyang Technological University (NTU), Singapore 637371, Singapore
| | - Yongxin Li
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, and §NTU-CBC Crystallography
Facility, Nanyang Technological University (NTU), Singapore 637371, Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological
Chemistry, School of Physical and Mathematical Sciences, and §NTU-CBC Crystallography
Facility, Nanyang Technological University (NTU), Singapore 637371, Singapore
| |
Collapse
|
36
|
Patra A, Mukherjee S, Das TK, Jain S, Gonnade RG, Biju AT. N-Heterocyclic-Carbene-Catalyzed Umpolung of Imines. Angew Chem Int Ed Engl 2017; 56:2730-2734. [DOI: 10.1002/anie.201611268] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 01/04/2017] [Indexed: 12/22/2022]
Affiliation(s)
- Atanu Patra
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Subrata Mukherjee
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Tamal Kanti Das
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Shailja Jain
- Physical/Materials Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
| | - Rajesh G. Gonnade
- Centre for Materials Characterization; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
| | - Akkattu T. Biju
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| |
Collapse
|
37
|
Patra A, Mukherjee S, Das TK, Jain S, Gonnade RG, Biju AT. N-Heterocyclic-Carbene-Catalyzed Umpolung of Imines. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611268] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Atanu Patra
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Subrata Mukherjee
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Tamal Kanti Das
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| | - Shailja Jain
- Physical/Materials Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
| | - Rajesh G. Gonnade
- Centre for Materials Characterization; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
| | - Akkattu T. Biju
- Organic Chemistry Division; CSIR-National Chemical Laboratory; Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110020 India
| |
Collapse
|
38
|
Di Carmine G, Ragno D, De Risi C, Bortolini O, Giovannini PP, Fantin G, Massi A. Synthesis of functionalized imidazolidine-2-thiones via NHC/base-promoted aza-benzoin/aza-acetalization domino reactions. Org Biomol Chem 2017; 15:8788-8801. [DOI: 10.1039/c7ob02259j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Benzylidene thioureas were generated in situ from α-sulfonylamines and used as novel umpolung acceptors in aza-benzoin/aza-acetalization domino reactions giving 5-hydroxy-imidazolidine-2-thiones.
Collapse
Affiliation(s)
- Graziano Di Carmine
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Daniele Ragno
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Carmela De Risi
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Olga Bortolini
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Pier Paolo Giovannini
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Giancarlo Fantin
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| | - Alessandro Massi
- Dipartimento di Scienze Chimiche e Farmaceutiche
- Università di Ferrara
- I-44121 Ferrara
- Italy
| |
Collapse
|
39
|
Powers K, Hering-Junghans C, McDonald R, Ferguson MJ, Rivard E. Improved synthesis of N-heterocyclic olefins and evaluation of their donor strengths. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.07.070] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
40
|
Kumar A, Maurya S, Pratap K, Srivastava S. Betaine mediated synthesis of annulated dihydrofurans from oxobis(methylthio)ketene acetals and N-butyl-N'-methyl ethane-1,2-diamine as precursors via NHC elimination. Chem Commun (Camb) 2016; 52:2795-8. [PMID: 26771026 DOI: 10.1039/c5cc09509c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
First in situ generation of a betaine intermediate has been developed using two new precursors oxobis(methylthio)ketene acetals and N-butyl-N'-methyl ethane-1,2-diamine for the synthesis of annulated dihydrofurans. This protocol adds a new dimension for the formation of annulated dihydrofurans through a series of selective consecutive formation of C-C and C-O bonds after reacting with enone rings. This in situ generated betaine intermediate corresponds to deoxy-Breslow intermediates in the reaction via elimination of NHC.
Collapse
Affiliation(s)
- Atul Kumar
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi 110001, India
| | - Shivam Maurya
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi 110001, India
| | - Kemant Pratap
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi 110001, India
| | - Suman Srivastava
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram extension, Sitapur Road, P.O. Box 173, Lucknow 226031, India.
| |
Collapse
|
41
|
Hong M, Tang X, Falivene L, Caporaso L, Cavallo L, Chen EYX. Proton-Transfer Polymerization by N-Heterocyclic Carbenes: Monomer and Catalyst Scopes and Mechanism for Converting Dimethacrylates into Unsaturated Polyesters. J Am Chem Soc 2016; 138:2021-35. [PMID: 26779897 DOI: 10.1021/jacs.5b13019] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This contribution presents a full account of experimental and theoretical/computational investigations into the N-heterocyclic carbene (NHC)-catalyzed proton-transfer polymerization (HTP) that converts common dimethacrylates (DMAs) containing no protic groups into unsaturated polyesters. This new HTP proceeds through the step-growth propagation cycles via enamine intermediates, consisting of the proposed conjugate addition-proton transfer-NHC release fundamental steps. This study examines the monomer and catalyst scopes as well as the fundamental steps involved in the overall HTP mechanism. DMAs having six different types of linkages connecting the two methacrylates have been polymerized into the corresponding unsaturated polyesters. The most intriguing unsaturated polyester of the series is that based on the biomass-derived furfuryl dimethacrylate, which showed a unique self-curing ability. Four MeO- and Cl-substituted TPT (1,3,4-triphenyl-4,5-dihydro-1H-1,2,4-triazol-5-ylidene) derivatives as methanol insertion products, (Rx)TPT(MeO/H) (R = MeO, Cl; x = 2, 3), and two free carbenes (catalysts), (OMe2)TPT and (OMe3)TPT, have been synthesized, while (OMe2)TPT(MeO/H) and (OMe2)TPT have also been structurally characterized. The structure/reactivity relationship study revealed that (OMe2)TPT, being both a strong nucleophile and a good leaving group, exhibits the highest HTP activity and also produced the polyester with the highest Mn, while the Cl-substituted TPT derivatives are least active and efficient. Computational studies have provided mechanistic insights into the tail-to-tail dimerization coupling step as a suitable model for the propagation cycle of the HTP. The extensive energy profile was mapped out, and the experimentally observed unicity of the TPT-based catalysts was satisfactorily explained with the thermodynamic formation of key spirocyclic species.
Collapse
Affiliation(s)
- Miao Hong
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523-1872, United States
| | - Xiaoyan Tang
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523-1872, United States
| | - Laura Falivene
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Kaust Catalysis Center, Thuwal 23955-6900, Saudi Arabia.,Dipartimento di Chimica e Biologia, Università di Salerno , Via Papa Paolo Giovanni II, I-84084, Fisciano, Italy
| | - Lucia Caporaso
- Dipartimento di Chimica e Biologia, Università di Salerno , Via Papa Paolo Giovanni II, I-84084, Fisciano, Italy
| | - Luigi Cavallo
- King Abdullah University of Science and Technology (KAUST), Physical Sciences and Engineering Division, Kaust Catalysis Center, Thuwal 23955-6900, Saudi Arabia.,Dipartimento di Chimica e Biologia, Università di Salerno , Via Papa Paolo Giovanni II, I-84084, Fisciano, Italy
| | - Eugene Y-X Chen
- Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523-1872, United States
| |
Collapse
|
42
|
Nakano Y, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalysis by the Umpolung of α,β‐Unsaturated Ketones. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510106] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
43
|
Nakano Y, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalysis by the Umpolung of α,β‐Unsaturated Ketones. Angew Chem Int Ed Engl 2016; 55:3135-9. [DOI: 10.1002/anie.201510106] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 12/24/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Yuji Nakano
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| |
Collapse
|
44
|
Bhunia A, Yetra SR, Gonnade RG, Biju AT. Synthesis of 4H-chromenes by an unexpected, K3PO4-mediated intramolecular Rauhut–Currier type reaction. Org Biomol Chem 2016; 14:5612-6. [DOI: 10.1039/c6ob00654j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The K3PO4-mediated intramolecular Rauhut-Currier type reaction of chalcones having an enoate moiety leading to the formation of 4H-chromenes in moderate to good yields is demonstrated.
Collapse
Affiliation(s)
- Anup Bhunia
- Organic Chemistry Division
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Santhivardhana Reddy Yetra
- Organic Chemistry Division
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Rajesh G. Gonnade
- Centre for Materials Characterization
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
| | - Akkattu T. Biju
- Organic Chemistry Division
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| |
Collapse
|
45
|
Matsuoka SI, Nakazawa M, Suzuki M. Expanding the Scope of the Tail-to-Tail Dimerization of Vinyl Compounds Catalyzed by N-Heterocyclic Carbene. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2015. [DOI: 10.1246/bcsj.20150048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Shin-ichi Matsuoka
- Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
| | - Masanori Nakazawa
- Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
| | - Masato Suzuki
- Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology
| |
Collapse
|
46
|
|
47
|
Bhunia A, Thorat S, Gonnade RG, Biju AT. Reaction of N-heterocyclic carbenes with chalcones leading to the synthesis of deoxy-Breslow intermediates in their oxidized form. Chem Commun (Camb) 2015; 51:13690-3. [DOI: 10.1039/c5cc05800g] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Presented herein is the reaction of N-heterocyclic carbenes (NHCs) with chalcones resulting in the isolation of the deoxy-Breslow intermediate in the oxidized form. In addition, the tetrahedral intermediate formed by the initial 1,4-addition of NHC to chalcones has also been isolated.
Collapse
Affiliation(s)
- Anup Bhunia
- Organic Chemistry Division
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
| | - Shridhar Thorat
- Centre for Materials Characterization
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
| | - Rajesh G. Gonnade
- Centre for Materials Characterization
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
| | - Akkattu T. Biju
- Organic Chemistry Division
- CSIR-National Chemical Laboratory (CSIR-NCL)
- Pune-411008
- India
| |
Collapse
|
48
|
Kelemen Z, Streubel R, Nyulászi L. Zwitterionic carbene adducts and their carbene isomers. RSC Adv 2015. [DOI: 10.1039/c5ra07039b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N-heterocyclic carbenes (NHC) and abnormal NHCs (aNHC) form the stable adducts,1and2, with X (CH2, SiH2, NH, PH, O, S), which are excellent nucleophiles at X.
Collapse
Affiliation(s)
- Z. Kelemen
- Department of Inorganic and Analytical Chemistry
- Budapest University of Technology and Economics
- Budapest
- Hungary
| | - R. Streubel
- Institut fur Anorganische Chemie der
- Rheinischen Friedrich-Wilhelms-Universitat Bonn
- 53121 Bonn
- Germany
| | - L. Nyulászi
- Department of Inorganic and Analytical Chemistry
- Budapest University of Technology and Economics
- Budapest
- Hungary
| |
Collapse
|
49
|
Matsuoka SI, Namera S, Suzuki M. Oxa-Michael addition polymerization of acrylates catalyzed by N-heterocyclic carbenes. Polym Chem 2015. [DOI: 10.1039/c4py01184h] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-heterocyclic carbenes (NHCs) smoothly catalyze the oxa-Michael addition polymerization of hydroxyl functionalized acrylate monomers at room temperature via a zwitterionic intermediate.
Collapse
Affiliation(s)
- Shin-ichi Matsuoka
- Department of Materials Science and Engineering
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya
- Japan
| | - Shoko Namera
- Department of Materials Science and Engineering
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya
- Japan
| | - Masato Suzuki
- Department of Materials Science and Engineering
- Graduate School of Engineering
- Nagoya Institute of Technology
- Nagoya
- Japan
| |
Collapse
|
50
|
Hong M, Chen EYX. Proton-Transfer Polymerization (HTP): Converting Methacrylates to Polyesters by an N-Heterocyclic Carbene. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406630] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|