1
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Harinath A, Karmakar H, Kisan DA, Nayek HP, Panda TK. NHC-Zn alkyl catalyzed cross-dehydrocoupling of amines and silanes. Org Biomol Chem 2023; 21:4237-4244. [PMID: 37139558 DOI: 10.1039/d3ob00453h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
An N-heterocyclic carbene-zinc alkyl complex [ImDippZn(CH2CH3)2] (Im = imidazol-2-ylidene and Dipp = 2,6-diisopropylphenyl) acts as a catalyst in the cross-dehydrogenative coupling (CDC) of a wide range of primary and secondary amines and hydrosilanes to yield a substantial quantity of the corresponding aminosilanes with good chemoselectivity at room temperature. A broad substrate scope was observed during the zinc-catalyzed CDC reaction. Two zinc complexes, [{ImMesZn(μ-NHPh)(NHPh)}2] (Mes = mesityl) (3) and [{ImDippZn(CH2CH3)(μ-H)}2] (4), were isolated and structurally characterized as intermediates through controlled reactions to ascertain the CDC mechanism.
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Affiliation(s)
- Adimulam Harinath
- Department of Chemistry and Chemical Biology, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Himadri Karmakar
- Department of Chemistry and Chemical Biology, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Devadkar Ajitaro Kisan
- Department of Chemistry and Chemical Biology, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
| | - Hari Pada Nayek
- Department of Applied Chemistry. Indian Institute of Technology (ISM) Dhanbad, Dhanbad 826004, Jharkhand, India
| | - Tarun K Panda
- Department of Chemistry and Chemical Biology, Indian Institute of Technology Hyderabad, Kandi - 502 284, Sangareddy, Telangana, India.
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2
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Wu Y, Ao Y, Li Z, Liu C, Zhao J, Gao W, Li X, Wang H, Liu Y, Liu Y. Modulation of metal species as control point for Ni-catalyzed stereodivergent semihydrogenation of alkynes with water. Nat Commun 2023; 14:1655. [PMID: 36964163 PMCID: PMC10039052 DOI: 10.1038/s41467-023-37022-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 02/23/2023] [Indexed: 03/26/2023] Open
Abstract
A base-assisted metal species modulation mechanism enables Ni-catalyzed stereodivergent transfer semihydrogenation of alkynes with water, delivering both olefinic isomers smoothly using cheap and nontoxic catalysts and additives. Different from most precedents, in which E-alkenes derive from the isomerization of Z-alkene products, the isomers were formed in orthogonal catalytic pathways. Mechanistic studies suggest base as a key early element in modulation of the reaction pathways: by adding different bases, nickel species with disparate valence states could be accessed to initiate two catalytic cycles toward different stereoisomers. The practicability of the method is showcased with nearly 70 examples, including internal and terminal triple bonds, enynes and diynes, affording semi-hydrogenated products in high yields and selectivity.
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Affiliation(s)
- Yuanqi Wu
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Yuhui Ao
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Zhiming Li
- Department of Chemistry, Fudan University, 200438, Shanghai, PR China.
| | - Chunhui Liu
- College of Chemical and Materials Engineering, Xuchang University, 461000, Xuchang, PR China
| | - Jinbo Zhao
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Wenyu Gao
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Xuemeng Li
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Hui Wang
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Yongsheng Liu
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China
| | - Yu Liu
- Jilin Provincial Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Advanced Institute of Materials Science, Changchun University of Technology, 130012, Changchun, PR China.
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3
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Wirtz L, Ghulam KY, Morgenstern B, Schäfer A. Constrained Geometry
ansa
‐Half‐Sandwich Complexes of Magnesium – Versatile
s
‐Block Catalysts. ChemCatChem 2022. [DOI: 10.1002/cctc.202201007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lisa Wirtz
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - Kinza Yasmin Ghulam
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - Bernd Morgenstern
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
| | - André Schäfer
- Faculty of Natural Science and Technology Department of Chemistry Saarland University Campus Saarbrücken 66123 Saarbrücken Germany
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4
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Shi Y, Wang Y, Huang Z, Zhang F, Shao Y. t BuOLi-Promoted Hydroboration of Esters and Epoxides. ACS OMEGA 2022; 7:18876-18886. [PMID: 35694491 PMCID: PMC9178618 DOI: 10.1021/acsomega.2c01866] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Commercially available and inexpensive lithium tert-butoxide ( t BuOLi) acts as a good precatalyst for the hydroboration of esters, lactones, and epoxides using pinacolborane as a borylation agent. Functional groups such as cyano-, nitro-, amino-, vinyl, and alkynyl are unaffected under the presented hydroboration process, representing high chemoselectivity. This transformation has also been effectively applied to the synthesis of key intermediates of Erlotinib and Cinacalcet. Preliminary investigations of the mechanism show that the hydroboration proceeds through the in situ formed BH3 species.
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Affiliation(s)
- Yinyin Shi
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yue Wang
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Zhefan Huang
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Fangjun Zhang
- School
of Pharmaceutical Sciences, Wenzhou Medical
University, Wenzhou 325035, China
| | - Yinlin Shao
- College
of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
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5
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Kuciński K, Stachowiak-Dłużyńska H, Hreczycho G. Catalytic silylation of O–nucleophiles via Si–H or Si–C bond cleavage: A route to silyl ethers, silanols and siloxanes. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214456] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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6
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Sarkar N, Kumar Sahoo R, Ganesh Patro A, Nembenna S. Aluminum-Catalyzed Selective Hydroboration of Carbonyls and Dehydrocoupling of Alcohols, Phenols, Amines, Thiol, Selenol, Silanols with HBpin. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Liu J, Wu C, Hu T, Yang W, Xie Y, Shi Y, Liu Q, Shao Y, Zhang F. Hexamethyldisilazane Lithium (LiHMDS)-Promoted Hydroboration of Alkynes and Alkenes with Pinacolborane. J Org Chem 2022; 87:3442-3452. [PMID: 35143184 DOI: 10.1021/acs.joc.1c03012] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Lithium-promoted hydroboration of alkynes and alkenes using commercially available hexamethyldisilazane lithium as a precatalyst and HBpin as a hydride source has been developed. This method will be appealing for organic synthesis because of its remarkable substrate tolerance and good yields. Mechanistic studies revealed that the hydroboration proceeds through the in situ-formed BH3 species, which acts to drive the turnover of the hydroboration of alkynes and alkenes.
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Affiliation(s)
- Jichao Liu
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China.,College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Caiyan Wu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Tinghui Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Wei Yang
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yaoyao Xie
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yinyin Shi
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Qianrui Liu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yinlin Shao
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Fangjun Zhang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
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8
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9
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Roy MMD, Omaña AA, Wilson ASS, Hill MS, Aldridge S, Rivard E. Molecular Main Group Metal Hydrides. Chem Rev 2021; 121:12784-12965. [PMID: 34450005 DOI: 10.1021/acs.chemrev.1c00278] [Citation(s) in RCA: 132] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This review serves to document advances in the synthesis, versatile bonding, and reactivity of molecular main group metal hydrides within Groups 1, 2, and 12-16. Particular attention will be given to the emerging use of said hydrides in the rapidly expanding field of Main Group element-mediated catalysis. While this review is comprehensive in nature, focus will be given to research appearing in the open literature since 2001.
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Affiliation(s)
- Matthew M D Roy
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Alvaro A Omaña
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada
| | - Andrew S S Wilson
- Department of Chemistry, University of Bath, Avon BA2 7AY, United Kingdom
| | - Michael S Hill
- Department of Chemistry, University of Bath, Avon BA2 7AY, United Kingdom
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom
| | - Eric Rivard
- Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada
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10
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Kaufmann S, Roesky PW. Investigating a Redox Active Samarium Complex in Catalytic Reactions. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100391] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Sebastian Kaufmann
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstrasse 15 76131 Karlsruhe Germany
| | - Peter W. Roesky
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstrasse 15 76131 Karlsruhe Germany
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11
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Banerjee I, Panda TK. Recent developments in the reduction of unsaturated bonds by magnesium precursors. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6333] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Indrani Banerjee
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy India
| | - Tarun K. Panda
- Department of Chemistry Indian Institute of Technology Hyderabad Sangareddy India
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12
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Gentner TX, Mulvey RE. Alkali-Metal Mediation: Diversity of Applications in Main-Group Organometallic Chemistry. Angew Chem Int Ed Engl 2021; 60:9247-9262. [PMID: 33017511 PMCID: PMC8247348 DOI: 10.1002/anie.202010963] [Citation(s) in RCA: 95] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Indexed: 12/23/2022]
Abstract
Organolithium compounds have been at the forefront of synthetic chemistry for over a century, as they mediate the synthesis of myriads of compounds that are utilised worldwide in academic and industrial settings. For that reason, lithium has always been the most important alkali metal in organometallic chemistry. Today, that importance is being seriously challenged by sodium and potassium, as the alkali-metal mediation of organic reactions in general has started branching off in several new directions. Recent examples covering main-group homogeneous catalysis, stoichiometric organic synthesis, low-valent main-group metal chemistry, polymerization, and green chemistry are showcased in this Review. Since alkali-metal compounds are often not the end products of these applications, their roles are rarely given top billing. Thus, this Review has been written to alert the community to this rising unifying phenomenon of "alkali-metal mediation".
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Affiliation(s)
- Thomas X. Gentner
- Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Robert E. Mulvey
- Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
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13
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Gentner TX, Mulvey RE. Alkalimetall‐Mediatoren: Vielfältige Anwendungen in der metallorganischen Chemie der Hauptgruppenelemente. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202010963] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Thomas X. Gentner
- Department of Pure and Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
| | - Robert E. Mulvey
- Department of Pure and Applied Chemistry University of Strathclyde Glasgow G1 1XL Großbritannien
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14
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Banerjee I, Sagar S, Panda TK. Calcium mediated efficient synthesis of N-arylamidines from organic nitriles and amines. Org Biomol Chem 2020; 18:4231-4237. [PMID: 32458962 DOI: 10.1039/d0ob00805b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Amidines are a preeminent group of organic compounds having wide applications in various industries. Here, we have developed a simple one-step reaction protocol for the facile synthesis of N-arylamidines catalysed by calcium bis(hexamethyldisilazide) [Ca{N(SiMe3)2}2(THF)2]. The amidine synthesis was readily achieved from organic nitriles and amines which provided a broad substrate scope ranging from electron-withdrawing to electron-donating substitutions as well as heterocyclic substitution. The reaction was carried out in a solvent-free medium under ambient conditions. The nucleophilic addition of aromatic amines to aryl nitriles led to good to excellent yields of the corresponding amidines. The reactivity of the amidines was further examined and the respective urea derivatives were achieved in excellent yields. The plausible mechanism involves the generation of an active calcium amido pre-catalyst that helps in the activation of nitriles in the reaction course.
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Affiliation(s)
- Indrani Banerjee
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
| | - Shweta Sagar
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy 502285, Telangana, India.
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15
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Kuciński K, Stachowiak H, Hreczycho G. Silylation of silanols with hydrosilanes via main-group catalysis: the synthesis of unsymmetrical siloxanes and hydrosiloxanes. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00904k] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Apart from some specific synthetic solutions, a dehydrogenative coupling of silanols with hydrosilanes seems to be the most atom-economical and practical method for the formation of unsymmetrical siloxanes.
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Affiliation(s)
- Krzysztof Kuciński
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - Hanna Stachowiak
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - Grzegorz Hreczycho
- Faculty of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
- Center for Advanced Technologies
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16
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Ried ACA, Taylor LJ, Geer AM, Williams HEL, Lewis W, Blake AJ, Kays DL. A Highly Active Bidentate Magnesium Catalyst for Amine-Borane Dehydrocoupling: Kinetic and Mechanistic Studies. Chemistry 2019; 25:6840-6846. [PMID: 30875128 PMCID: PMC6563444 DOI: 10.1002/chem.201901197] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Indexed: 11/06/2022]
Abstract
A magnesium complex (1) featuring a bidentate aminopyridinato ligand is a remarkably selective catalyst for the dehydrocoupling of amine-boranes. This reaction proceeds to completion with low catalyst loadings (1 mol %) under mild conditions (60 °C), exceeding previously reported s-block systems in terms of selectivity, rate, and turnover number (TON). Mechanistic studies by in situ NMR analysis reveals the reaction to be first order in both catalyst and substrate. A reaction mechanism is proposed to account for these findings, with the high TON of the catalyst attributed to the bidentate nature of the ligand, which allows for reversible deprotonation of the substrate and regeneration of 1 as a stable resting state.
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Affiliation(s)
| | - Laurence J. Taylor
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - Ana M. Geer
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
- Current address: Department of ChemistryUniversity of VirginiaCharlottesvilleVirginia22904USA
| | - Huw E. L. Williams
- Centre for Biomolecular SciencesUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - William Lewis
- School of ChemistryThe University of Sydney, F11Eastern AveSydneyNSW2006Australia
| | - Alexander J. Blake
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
| | - Deborah L. Kays
- School of ChemistryUniversity of NottinghamUniversity ParkNottinghamNG7 2RDUK
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17
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Banerjee I, Harinath A, Panda TK. Alkali Metal Catalysed Double Hydrophosphorylation of Nitriles and Alkynes. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900164] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Indrani Banerjee
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
| | - Adimulam Harinath
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
| | - Tarun K. Panda
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi – 502 285, Sangareddy, Telangana India
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18
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Harinath A, Bhattacharjee J, Nayek HP, Panda TK. Alkali metal complexes as efficient catalysts for hydroboration and cyanosilylation of carbonyl compounds. Dalton Trans 2018; 47:12613-12622. [PMID: 30043795 DOI: 10.1039/c8dt02032a] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We report here reactions between the N-adamantyliminopyrolyl ligand 2-(AdN[double bond, length as m-dash]CH)-C4H3NH (L-H) and alkali metal hexamethyldisilazides [MN(SiMe3)2] (M = Li, Na and K) to afford the dimeric [{2-(AdN[double bond, length as m-dash]CH)-C4H3NLi(THF)}2] (1), [{2-(AdN[double bond, length as m-dash]CH)-C4H3N}{Na(THF)1.5}2] (2) and polymeric [{2-(AdN[double bond, length as m-dash]CH)-C4H3NK(THF)}n] (3) complexes at ambient temperature. A one-pot reaction between L-H, [KN(SiMe3)2] and alkaline earth metal diiodide (AeI2) in a 2 : 2 : 1 molar ratio, which resulted in the formation of a heteroleptic Ae metal complex [κ2-{2-(AdN[double bond, length as m-dash]CH)-C4H3N}2Ae(THF)2] [Ae = Mg (4), Ca (5)], is also reported. The solid-state structures of complexes 1, 3 and 4 were established through single-crystal X-ray diffraction analysis. The alkali and alkaline earth metal complexes 1-5 were utilised as precatalysts for the catalytic hydroboration of pinacolborane (HBpin) with aldehydes and ketones, and potassium complex 3 was identified as a competent catalyst under mild conditions. Additionally, cyanosilylation of carbonyl compounds was explored with trimethylsilyl cyanide and aldehydes/ketones, using the alkali metal precatalyst 3 under mild conditions. In both catalytic processes, the potassium catalyst 3 exhibited high tolerance towards a number of functional groups.
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Affiliation(s)
- Adimulam Harinath
- Department of Chemistry, Indian Institute of Technology Hyderabad Kandi - 502 285, Sangareddy, Telangana, India.
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19
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Moreno S, Ramos A, Carrillo-Hermosilla F, Rodríguez-Diéguez A, García-Vivó D, Fernández-Galán R, Antiñolo A. Selective Three-Component Coupling for CO 2 Chemical Fixation to Boron Guanidinato Compounds. Inorg Chem 2018; 57:8404-8413. [PMID: 29949350 DOI: 10.1021/acs.inorgchem.8b01068] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A selective three-component coupling was employed to fix carbon dioxide to boron guanidinato compounds. The one-pot reaction of carbon dioxide, carbodiimides, and borylamines (ArNH)BC8H14 afforded the corresponding 1,2-adducts {R(H)N}C{N(Ar)}(NR)(CO2)BC8H14. Alternatively, the reaction with p-MeOC6H4NC or 2,6-Me2C6H3NC gave the corresponding isocyanide 1,1-adducts { i-PrHN}C{N(p-Me-C6H4)}(N i-Pr){CNAr}BC8H14. The molecular structures of products (2,6- i-Pr2C6H3NH)BC8H14 7, { i-Pr(H)N}C{N(p-MeC6H4)}(N i-Pr)(CO2)BC8H14 9, {Cy(H)N}C{N( p-MeC6H4)}(Cy)(CO2)BC8H14 13, and { i-PrHN}C{N( p-MeC6H4)}(N i-Pr){CNR″}BC8H14 (R″ = p-MeOC6H4, 2,6-Me2C6H3) 14 and 15 were established by X-ray diffraction. Density functional theory calculations at the M05-2X level of theory revealed that CO2 fixation and formation of the corresponding adduct is exothermic and proceeds via a nonchelate boron guanidinato intermediate.
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Affiliation(s)
- Sonia Moreno
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Alberto Ramos
- Departamento de Química Inorgánica, Orgánica y Bioquímica , Instituto Regional de Investigación Científica Aplicada, Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Fernando Carrillo-Hermosilla
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias , Universidad de Granada , Avenida de la Fuente Nueva S/N , 18071 Granada , Spain
| | - Daniel García-Vivó
- Departamento de Química Orgánica e Inorgánica/IUQOEM , Universidad de Oviedo , E-33071 Oviedo , Spain
| | - Rafael Fernández-Galán
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
| | - Antonio Antiñolo
- Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Castilla-La Mancha , Campus Universitario , E-13071 Ciudad Real , Spain
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20
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Rauser M, Warzecha DP, Niggemann M. O2
-Mediated Oxidation of Aminoboranes through 1,2-N Migration. Angew Chem Int Ed Engl 2018; 57:5903-5907. [DOI: 10.1002/anie.201803168] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Marian Rauser
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Daniel P. Warzecha
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Meike Niggemann
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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Rauser M, Warzecha DP, Niggemann M. O2
-Mediated Oxidation of Aminoboranes through 1,2-N Migration. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Marian Rauser
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Daniel P. Warzecha
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Meike Niggemann
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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22
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Romero EA, Peltier JL, Jazzar R, Bertrand G. Catalyst-free dehydrocoupling of amines, alcohols, and thiols with pinacol borane and 9-borabicyclononane (9-BBN). Chem Commun (Camb) 2018; 52:10563-5. [PMID: 27498971 DOI: 10.1039/c6cc06096j] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Contrary to recent reports, the dehydrocoupling of pinacol borane and 9-borabicyclononane with a variety of amines, alcohols and thiols can be achieved under mild conditions without catalyst. This process involves the formation of Lewis acid-base adducts featuring a hydridic B-H in close proximity to an acidic Nu-H.
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Affiliation(s)
- Erik A Romero
- UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA.
| | - Jesse L Peltier
- UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA.
| | - Rodolphe Jazzar
- UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA.
| | - Guy Bertrand
- UCSD-CNRS Joint Research Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0358, USA.
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23
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Nolla-Saltiel R, Geer AM, Lewis W, Blake AJ, Kays DL. Dehydrogenation of dimethylamine-borane mediated by Group 1 pincer complexes. Chem Commun (Camb) 2018; 54:1825-1828. [DOI: 10.1039/c7cc08385h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alkali metal carbazolido complexes are precatalysts for the dehydrogenation of Me2NH·BH3, where the cation plays a vital role in the reaction outcome.
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Affiliation(s)
| | - Ana M. Geer
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
| | - William Lewis
- School of Chemistry
- University of Nottingham
- Nottingham
- UK
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24
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McLellan R, Kennedy AR, Mulvey RE, Orr SA, Robertson SD. 1-Alkali-metal-2-alkyl-1,2-dihydropyridines: Soluble Hydride Surrogates for Catalytic Dehydrogenative Coupling and Hydroboration Applications. Chemistry 2017; 23:16853-16861. [PMID: 28940713 PMCID: PMC5820744 DOI: 10.1002/chem.201703609] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Indexed: 01/27/2023]
Abstract
Equipped with excellent hydrocarbon solubility, the lithium hydride surrogate 1-lithium-2-tert-butyl-1,2-dihydropyridine (1tLi) functions as a precatalyst to convert Me2 NH⋅BH3 to [NMe2 BH2 ]2 (89 % conversion) under competitive conditions (2.5 mol %, 60 h, 80 °C, toluene solvent) to that of previously reported LiN(SiMe3 )2 . Sodium and potassium dihydropyridine congeners produce similar high yields of [NMe2 BH2 ]2 but require longer times. Switching the solvent to pyridine induces a remarkable change in the dehydrocoupling product ratio, with (NMe2 )2 BH favoured over [NMe2 BH2 ]2 (e.g., 94 %:2 % for 1tLi). Demonstrating its versatility, precatalyst 1tLi was also successful in promoting hydroboration reactions between pinacolborane and a selection of aldehydes and ketones. Most reactions gave near quantitative conversion to the hydroborated products in 15 minutes, though sterically demanding carbonyl substrates require longer times. The mechanisms of these rare examples of Group 1 metal-catalysed processes are discussed.
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Affiliation(s)
- Ross McLellan
- WestCHEM, Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Alan R. Kennedy
- WestCHEM, Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Robert E. Mulvey
- WestCHEM, Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Samantha A. Orr
- WestCHEM, Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
| | - Stuart D. Robertson
- WestCHEM, Department of Pure and Applied ChemistryUniversity of StrathclydeGlasgowG1 1XLUK
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25
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26
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Rauser M, Ascheberg C, Niggemann M. Electrophilic Amination with Nitroarenes. Angew Chem Int Ed Engl 2017; 56:11570-11574. [DOI: 10.1002/anie.201705356] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Revised: 07/04/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Marian Rauser
- Institute of Organic Chemistry; RWTH Aachen; Landoltweg 1 52072 Aachen Germany
| | - Christoph Ascheberg
- Institute of Organic Chemistry; RWTH Aachen; Landoltweg 1 52072 Aachen Germany
| | - Meike Niggemann
- Institute of Organic Chemistry; RWTH Aachen; Landoltweg 1 52072 Aachen Germany
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27
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Wu D, Wang R, Li Y, Ganguly R, Hirao H, Kinjo R. Electrostatic Catalyst Generated from Diazadiborinine for Carbonyl Reduction. Chem 2017. [DOI: 10.1016/j.chempr.2017.06.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Affiliation(s)
- Étienne Rochette
- Département de Chimie, Centre de Catalyse et Chimie Verte (C3 V) Université Laval, 1045 Avenue de
la Médecine, Québec, G1V 0A6 Québec, Canada
| | - Hugo Boutin
- Département de Chimie, Centre de Catalyse et Chimie Verte (C3 V) Université Laval, 1045 Avenue de
la Médecine, Québec, G1V 0A6 Québec, Canada
| | - Frédéric-Georges Fontaine
- Département de Chimie, Centre de Catalyse et Chimie Verte (C3 V) Université Laval, 1045 Avenue de
la Médecine, Québec, G1V 0A6 Québec, Canada
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29
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Harinath A, Bhattacharjee J, Anga S, Panda TK. Dehydrogenative Coupling of Hydrosilanes and Alcohols by Alkali Metal Catalysts for Facile Synthesis of Silyl Ethers. Aust J Chem 2017. [DOI: 10.1071/ch16537] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Cross-dehydrogenative coupling (CDC) of hydrosilanes with hydroxyl groups, using alkali metal hexamethyldisilazide as a single-component catalyst for the formation of Si–O bonds under mild condition, is reported. The potassium salt [KN(SiMe3)2] is highly efficient and chemoselective for a wide range of functionalized alcohols (99 % conversion) under solvent-free conditions. The CDC reaction of alcohols with silanes exhibits first-order kinetics with respect to both catalyst and substrate concentrations. The most plausible mechanism for this reaction suggests that the initial step most likely involves the formation of an alkoxide followed by the formation of metal hydride as active species.
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Ojeda-Amador AI, Martínez-Martínez AJ, Robertson GM, Robertson SD, Kennedy AR, O'Hara CT. Exploring the solid state and solution structural chemistry of the utility amide potassium hexamethyldisilazide (KHMDS). Dalton Trans 2017; 46:6392-6403. [PMID: 28466908 DOI: 10.1039/c7dt01118k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The coordination chemistry of the important potassium amide KHMDS has been explored both in the solid state and in solution.
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Affiliation(s)
- Ana I. Ojeda-Amador
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | | | - Gemma M. Robertson
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Stuart D. Robertson
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Alan R. Kennedy
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | - Charles T. O'Hara
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
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31
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McLellan R, Kennedy AR, Orr SA, Robertson SD, Mulvey RE. Lithium Dihydropyridine Dehydrogenation Catalysis: A Group 1 Approach to the Cyclization of Diamine Boranes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610905] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ross McLellan
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Alan R. Kennedy
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Samantha A. Orr
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Stuart D. Robertson
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Robert E. Mulvey
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
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32
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McLellan R, Kennedy AR, Orr SA, Robertson SD, Mulvey RE. Lithium Dihydropyridine Dehydrogenation Catalysis: A Group 1 Approach to the Cyclization of Diamine Boranes. Angew Chem Int Ed Engl 2016; 56:1036-1041. [PMID: 28000994 PMCID: PMC5396369 DOI: 10.1002/anie.201610905] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Indexed: 11/15/2022]
Abstract
In reactions restricted previously to a ruthenium catalyst, a 1‐lithium‐2‐alkyl‐1,2‐dihydropyridine complex is shown to be a competitive alternative dehydrogenation catalyst for the transformation of diamine boranes into cyclic 1,3,2‐diazaborolidines, which can in turn be smoothly arylated in good yields. This study established the conditions and solvent dependence of the catalysis through NMR monitoring, with mechanistic insight provided by NMR (including DOSY) experiments and X‐ray crystallographic studies of several model lithio intermediates.
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Affiliation(s)
- Ross McLellan
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Alan R Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Samantha A Orr
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Stuart D Robertson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Robert E Mulvey
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
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