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Rohrbach S, Šiaučiulis M, Chisholm G, Pirvan PA, Saleeb M, Mehr SHM, Trushina E, Leonov AI, Keenan G, Khan A, Hammer A, Cronin L. Digitization and validation of a chemical synthesis literature database in the ChemPU. Science 2022; 377:172-180. [DOI: 10.1126/science.abo0058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Despite huge potential, automation of synthetic chemistry has only made incremental progress over the past few decades. We present an automatically executable chemical reaction database of 100 molecules representative of the range of reactions found in contemporary organic synthesis. These reactions include transition metal–catalyzed coupling reactions, heterocycle formations, functional group interconversions, and multicomponent reactions. The chemical reaction codes or χDLs for the reactions have been stored in a database for version control, validation, collaboration, and data mining. Of these syntheses, more than 50 entries from the database have been downloaded and robotically run in seven modular ChemPU’s with yields and purities comparable to those achieved by an expert chemist. We also demonstrate the automatic purification of a range of compounds using a chromatography module seamlessly coupled to the platform and programmed with the same language.
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Affiliation(s)
- Simon Rohrbach
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Mindaugas Šiaučiulis
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Greig Chisholm
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Petrisor-Alin Pirvan
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Michael Saleeb
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - S. Hessam M. Mehr
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Ekaterina Trushina
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Artem I. Leonov
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Graham Keenan
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Aamir Khan
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Alexander Hammer
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
| | - Leroy Cronin
- School of Chemistry, the University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
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2
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Aguirre AL, Loud NL, Johnson KA, Weix DJ, Wang Y. ChemBead Enabled High-Throughput Cross-Electrophile Coupling Reveals a New Complementary Ligand. Chemistry 2021; 27:12981-12986. [PMID: 34233043 PMCID: PMC8554800 DOI: 10.1002/chem.202102347] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Indexed: 12/15/2022]
Abstract
High-throughput experimentation (HTE) methods are central to modern medicinal chemistry. While many HTE approaches to C-N and Csp2 -Csp2 bonds are available, options for Csp2 -Csp3 bonds are limited. We report here how the adaptation of nickel-catalyzed cross-electrophile coupling of aryl bromides with alkyl halides to HTE is enabled by AbbVie ChemBeads technology. By using this approach, we were able to quickly map out the reactivity space at a global level with a challenging array of 3×222 micromolar reactions. The observed hit rate (56 %) is competitive with other often-used HTE reactions and the results are scalable. A key to this level of success was the finding that bipyridine 6-carboxamidine (BpyCam), a ligand that had not previously been shown to be optimal in any reaction, is as general as the best-known ligands with complementary reactivity. Such "cryptic" catalysts may be common and modern HTE methods should facilitate the process of finding these catalysts.
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Affiliation(s)
- Ana L Aguirre
- Advanced Chemistry Technologies Group, AbbVie, 1 N Waukegan Road, North Chicago, IL 60064, USA
| | - Nathan L Loud
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI 53706, USA
| | - Keywan A Johnson
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI 53706, USA
| | - Daniel J Weix
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave, Madison, WI 53706, USA
| | - Ying Wang
- Advanced Chemistry Technologies Group, AbbVie, 1 N Waukegan Road, North Chicago, IL 60064, USA
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3
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Campeau LC, Hazari N. Cross-Coupling and Related Reactions: Connecting Past Success to the Development of New Reactions for the Future. Organometallics 2019; 38:3-35. [PMID: 31741548 PMCID: PMC6860378 DOI: 10.1021/acs.organomet.8b00720] [Citation(s) in RCA: 216] [Impact Index Per Article: 43.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cross-coupling reactions, which were discovered almost 50 years ago, are widely used in both industry and academia. Even though cross-coupling reactions now represent mature technology, there is still a significant amount of research in this area that aims to improve the scope of these reactions, develop more efficient catalysts, and make reactions more practical. In this tutorial, a brief background to cross-coupling reactions is provided, and then the major advances in cross-coupling research over the last 20 years are described. These include the development of improved ligands and precatalysts for cross-coupling and the extension of cross-coupling reactions to a much wider range of electrophiles. For example, cross-coupling reactions are now common with sp3-hybridized electrophiles as well as ester, amide, ether, and aziridine substrates. For many of these more modern substrates, traditional palladium-based catalysts are less efficient than systems based on first-row transition metals such as nickel. Conventional cross-coupling reactions have also inspired the development of a range of related reactions, such as cross-electrophile and decarboxylative couplings as well as couplings based on metallaphotoredox chemistry. The development of these new reactions is probably at the same stage as traditional cross-coupling reactions 30 years ago, and this tutorial highlights how many of the same strategies used to improve cross-coupling reactions may also be applicable to making the new reactions more practical.
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Affiliation(s)
- Louis-Charles Campeau
- Department of Process Research and Development, Merck Research Laboratories, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
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4
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Wotal AC, Batesky DC, Weix DJ. Nickel-Catalyzed Synthesis of Ketones from Alkyl Halides and Acid Chlorides: Preparation of Ethyl 4-Oxododecanoate. ACTA ACUST UNITED AC 2016; 93:50-62. [PMID: 27667866 DOI: 10.15227/orgsyn.093.0050] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Alexander C Wotal
- University of Rochester, Department of Chemistry, RC Box 270216, Rochester, NY, USA 14627-0216
| | - Donald C Batesky
- University of Rochester, Department of Chemistry, RC Box 270216, Rochester, NY, USA 14627-0216
| | - Daniel J Weix
- University of Rochester, Department of Chemistry, RC Box 270216, Rochester, NY, USA 14627-0216
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5
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Johnson KA, Biswas S, Weix DJ. Cross-Electrophile Coupling of Vinyl Halides with Alkyl Halides. Chemistry 2016; 22:7399-402. [PMID: 27017436 DOI: 10.1002/chem.201601320] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2016] [Indexed: 12/18/2022]
Abstract
An improved method for the reductive coupling of aryl and vinyl bromides with alkyl halides that gave high yields for a variety of substrates at room temperature with a low (2.5 to 0.5 mol %) catalyst loading is presented. Under the optimized conditions, difficult substrates, such as unhindered alkenyl bromides, can be coupled to give the desired olefins with minimal diene formation and good stereoretention. These improved conditions also worked well for aryl bromides. For example, a gram-scale reaction was demonstrated with 0.5 mol % catalyst loading, whereas reactions at 10 mol % catalyst loading completed in as little as 20 minutes. Finally, a low-cost single-component pre-catalyst, (bpy)NiI2 (bpy=2,2'-bipyridine) that is both air- and moisture-stable over a period of months was introduced.
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Affiliation(s)
- Keywan A Johnson
- Department of Chemistry, University of Rochester, Rochester, NY, 14627-0216, USA
| | - Soumik Biswas
- Department of Chemistry, University of Rochester, Rochester, NY, 14627-0216, USA
| | - Daniel J Weix
- Department of Chemistry, University of Rochester, Rochester, NY, 14627-0216, USA.
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6
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Huihui KM, Caputo JA, Melchor Z, Olivares AM, Spiewak A, Johnson KA, DiBenedetto TA, Kim S, Ackerman LKG, Weix DJ. Decarboxylative Cross-Electrophile Coupling of N-Hydroxyphthalimide Esters with Aryl Iodides. J Am Chem Soc 2016; 138:5016-9. [PMID: 27029833 PMCID: PMC4841236 DOI: 10.1021/jacs.6b01533] [Citation(s) in RCA: 306] [Impact Index Per Article: 38.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 12/22/2022]
Abstract
A new method for the decarboxylative coupling of alkyl N-hydroxyphthalimide esters (NHP esters) with aryl iodides is presented. In contrast to previous studies that form alkyl radicals from carboxylic acid derivatives, no photocatalyst, light, or arylmetal reagent is needed, only nickel and a reducing agent (Zn). Methyl, primary, and secondary alkyl groups can all be coupled in good yield (77% ave yield). One coupling with an acid chloride is also presented. Stoichiometric reactions of (dtbbpy)Ni(2-tolyl)I with an NHP ester show for the first time that arylnickel(II) complexes can directly react with NHP esters to form alkylated arenes.
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Affiliation(s)
| | | | - Zulema Melchor
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Astrid M. Olivares
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Amanda
M. Spiewak
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Keywan A. Johnson
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Tarah A. DiBenedetto
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | - Seoyoung Kim
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
| | | | - Daniel J. Weix
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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Rouhi-Saadabad H, Akhlaghinia B. A One-Pot, fast, and efficient amidation of carboxylic acids, α-amino acids and sulfonic acids using pph 3/ n-chlorobenzotriazole system. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2015.1024313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Hamed Rouhi-Saadabad
- Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Batool Akhlaghinia
- Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
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8
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Weix DJ. Methods and Mechanisms for Cross-Electrophile Coupling of Csp(2) Halides with Alkyl Electrophiles. Acc Chem Res 2015; 48:1767-75. [PMID: 26011466 PMCID: PMC4484513 DOI: 10.1021/acs.accounts.5b00057] [Citation(s) in RCA: 669] [Impact Index Per Article: 74.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
Cross-electrophile
coupling, the cross-coupling of two different
electrophiles, avoids the need for preformed carbon nucleophiles,
but development of general methods has lagged behind cross-coupling
and C–H functionalization. A central reason for this slow development
is the challenge of selectively coupling two substrates that are alike
in reactivity. This Account describes the discovery of generally cross-selective
reactions of aryl halides and acyl halides with alkyl halides, the
mechanistic studies that illuminated the underlying principles of
these reactions, and the use of these fundamental principles in the
rational design of new cross-electrophile coupling reactions. Although the coupling of two different electrophiles under reducing
conditions often leads primarily to symmetric dimers, the subtle differences
in reactivity of aryl halides and alkyl halides with nickel catalysts
allowed for generally cross-selective coupling reactions. These conditions
could also be extended to the coupling of acyl halides with alkyl
halides. These reactions are exceptionally functional group tolerant
and can be assembled on the benchtop. A combination of stoichiometric
and catalytic studies on the mechanism
of these reactions revealed an unusual radical-chain mechanism and
suggests that selectivity arises from (1) the preference of nickel(0)
for oxidative addition to aryl halides and acyl halides over alkyl
halides and (2) the greater propensity of alkyl halides to form free
radicals. Bipyridine-ligated arylnickel intermediates react with alkyl
radicals to efficiently form, after reductive elimination, new C–C
bonds. Finally, the resulting nickel(I) species is proposed to regenerate
an alkyl radical to carry the chain. Examples of new reactions
designed using these principles include
carbonylative coupling of aryl halides with alkyl halides to form
ketones, arylation of epoxides to form β-aryl alcohols, and
coupling of benzyl sulfonate esters with aryl halides to form diarylmethanes.
Arylnickel(II) intermediates can insert carbon monoxide to form acylnickel(II)
intermediates that react with alkyl halides to form ketones, demonstrating
the connection between the mechanisms of reactions of aryl halides
and acid chlorides with alkyl halides. The low reactivity of epoxides
with nickel can be overcome by the use of either titanium or iodide
cocatalysis to facilitate radical generation and this can also be
extended to enantioselective arylation of meso-epoxides.
The high reactivity of benzyl bromide with nickel, which leads to
the formation of bibenzyl in attempted reactions with bromobenzene,
can be overcome by using a benzyl mesylate along with cobalt phthalocyanine
cocatalysis to convert the mesylate into an alkyl radical.
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Affiliation(s)
- Daniel J. Weix
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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Wotal AC, Ribson RD, Weix DJ. Stoichiometric Reactions of Acylnickel(II) Complexes with Electrophiles and the Catalytic Synthesis of Ketones. Organometallics 2014; 33:5874-5881. [PMID: 25364092 PMCID: PMC4210159 DOI: 10.1021/om5004682] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Indexed: 12/12/2022]
Abstract
![]()
Acylnickel(II)
complexes feature prominently in cross-electrophile
coupling (XEC) reactions that form ketones, yet their reactivity has
not been systematically investigated. We present here our studies
on the reactivity of acylnickel(II) complexes with a series of carbon
electrophiles. Bromobenzene, α-chloroethylbenzene, bromooctane,
and iodooctane were reacted with (dtbbpy)NiII(C(O)C5H11)(Br) (1b) and (dtbbpy)NiII(C(O)tolyl)(Br) (1c) to form a variety of organic products.
While reactions with bromobenzene formed complex mixtures of ketones,
reactions with α-chloroethylbenzene were highly selective for
the cross-ketone product. Reactions with iodooctane and bromooctane
also produced the cross-ketone product, but in intermediate yield
and selectivity. In most cases the presence or absence of a chemical
reductant (zinc) had only a small effect on the selectivity of the
reaction. The coupling of 1c with iodooctane (60% yield)
was translated into a catalytic reaction, the carbonylative coupling
of bromoarenes with primary bromoalkanes (six examples, 60% average
yield).
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Affiliation(s)
- Alexander C Wotal
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
| | - Ryan D Ribson
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
| | - Daniel J Weix
- Department of Chemistry, University of Rochester , Rochester, New York 14627-0216, United States
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Everson D, Weix DJ. Cross-electrophile coupling: principles of reactivity and selectivity. J Org Chem 2014; 79:4793-8. [PMID: 24820397 PMCID: PMC4049235 DOI: 10.1021/jo500507s] [Citation(s) in RCA: 411] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Indexed: 12/12/2022]
Abstract
A critical overview of the catalytic joining of two different electrophiles, cross-electrophile coupling (XEC), is presented with an emphasis on the central challenge of cross-selectivity. Recent synthetic advances and mechanistic studies have shed light on four possible methods for overcoming this challenge: (1) employing an excess of one reagent; (2) electronic differentiation of starting materials; (3) catalyst-substrate steric matching; and (4) radical chain processes. Each method is described using examples from the recent literature.
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Affiliation(s)
- Daniel
A. Everson
- Department
of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Daniel J. Weix
- Department
of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States
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Everson DA, Buonomo JA, Weix DJ. Nickel-catalyzed cross-electrophile coupling of 2-chloropyridines with alkyl bromides. Synlett 2014; 25:233-238. [PMID: 24795502 PMCID: PMC4006914 DOI: 10.1055/s-0033-1340151] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of 2-alkylated pyridines by the nickel-catalyzed cross-coupling of two different electrophiles, 2-chloropyridines with alkyl bromides, is described. Compared to our previously published conditions for aryl halides, this method uses the different, more rigid bathophenanthroline ligand and is conducted at high concentration in DMF solvent. The method displays promising functional group compatibility and the conditions are orthogonal to the Stille coupling.
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Affiliation(s)
- Daniel A. Everson
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA. Fax: 1-585-276-0205
| | - Joseph A. Buonomo
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA. Fax: 1-585-276-0205
| | - Daniel J. Weix
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA. Fax: 1-585-276-0205
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Zhao Y, Weix DJ. Nickel-catalyzed regiodivergent opening of epoxides with aryl halides: co-catalysis controls regioselectivity. J Am Chem Soc 2013; 136:48-51. [PMID: 24341892 DOI: 10.1021/ja410704d] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Epoxides are versatile intermediates in organic synthesis, but have rarely been employed in cross-coupling reactions. We report that bipyridine-ligated nickel can mediate the addition of functionalized aryl halides, a vinyl halide, and a vinyl triflate to epoxides under reducing conditions. For terminal epoxides, the regioselectivity of the reaction depends upon the cocatalyst employed. Iodide cocatalysis results in opening at the less hindered position via an iodohydrin intermediate. Titanocene cocatalysis results in opening at the more hindered position, presumably via Ti(III)-mediated radical generation. 1,2-Disubstituted epoxides are opened under both conditions to form predominantly the trans product.
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Affiliation(s)
- Yang Zhao
- Department of Chemistry, University of Rochester , Rochester, New York, United States 14627-0216
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Buonomo JA, Everson DA, Weix DJ. Substituted 2,2'-bipyridines by nickel-catalysis: 4,4'-di- tert-butyl-2,2'-bipyridine. SYNTHESIS-STUTTGART 2013; 45:3099-3102. [PMID: 25221358 PMCID: PMC4160121 DOI: 10.1055/s-0033-1338520] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
A simple, ligand-free synthesis of the important bipyridyl ligand 4,4'-di-tert-butyl-2,2'-bipyridine is presented. 5,5'-bis(trifluoromethyl)-2,2'-bipyridine is also synthesized by the same protocol. The syntheses efficiently couple the parent 2-chlorpyridies by a nickel-catalyzed dimerization with manganese powder as the terminal reductant.
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Affiliation(s)
- Joseph A. Buonomo
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA
| | - Daniel A. Everson
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA
| | - Daniel J. Weix
- Department of Chemistry, University of Rochester, Rochester, NY 14627-0216 USA
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