51
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Adachi S, Liew SK, Lee CF, Lough A, He Z, Denis JDS, Poda G, Yudin AK. Condensation-Driven Assembly of Boron-Containing Bis(Heteroaryl) Motifs Using a Linchpin Approach. Org Lett 2015; 17:5594-7. [DOI: 10.1021/acs.orglett.5b02741] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shinya Adachi
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - Sean K. Liew
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - C. Frank Lee
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - Alan Lough
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - Zhi He
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - Jeffrey D. St. Denis
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
| | - Gennady Poda
- Drug
Discovery Program, Ontario Institute for Cancer Research, MaRS Centre, 661 University Avenue, Suite 510, Toronto, ON M5G 0A3, Canada
- Leslie
Dan Faculty of Pharmacy, University of Toronto, 144 College Street, Toronto, ON M5S
3M2, Canada
| | - Andrei K. Yudin
- Davenport
Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada
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52
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Campos J, Aldridge S. Catalytic Borylation using an Air‐Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507627] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jesús Campos
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
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53
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Campos J, Aldridge S. Catalytic Borylation using an Air-Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015; 54:14159-63. [DOI: 10.1002/anie.201507627] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Indexed: 12/11/2022]
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54
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Noda H, Bode JW. Synthesis of Chemically and Configurationally Stable Monofluoro Acylboronates: Effect of Ligand Structure on their Formation, Properties, and Reactivities. J Am Chem Soc 2015; 137:3958-66. [DOI: 10.1021/jacs.5b00822] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hidetoshi Noda
- LaboratoriumfurOrganischeChemie,
Department of Chemistry and Applied Biosciences, ETH−Zurich, 8093 Zurich, Switzerland
| | - Jeffrey W. Bode
- LaboratoriumfurOrganischeChemie,
Department of Chemistry and Applied Biosciences, ETH−Zurich, 8093 Zurich, Switzerland
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55
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Taylor CL, Bolshan Y. Metal-free synthesis of ynones from acyl chlorides and potassium alkynyltrifluoroborate salts. J Vis Exp 2015. [PMID: 25742169 PMCID: PMC4354676 DOI: 10.3791/52401] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Ynones are a valuable functional group and building block in organic synthesis. Ynones serve as a precursor to many important organic functional groups and scaffolds. Traditional methods for the preparation of ynones are associated with drawbacks including harsh conditions, multiple purification steps, and the presence of unwanted byproducts. An alternative method for the straightforward preparation of ynones from acyl chlorides and potassium alkynyltrifluoroborate salts is described herein. The adoption of organotrifluoroborate salts as an alternative to organometallic reagents for the formation of new carbon-carbon bonds has a number of advantages. Potassium organotrifluoroborate salts are shelf stable, have good functional group tolerance, low toxicity, and a wide variety are straightforward to prepare. The title reaction proceeds rapidly at ambient temperature in the presence of a Lewis acid without the exclusion of air and moisture. Fair to excellent yields may be obtained via reaction of various aryl and alkyl acid chlorides with alkynyltrifluoroborate salts in the presence of boron trichloride.
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Affiliation(s)
| | - Yuri Bolshan
- Faculty of Science, University of Ontario Institute of Technology;
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56
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Improving Transformations Through Organotrifluoroborates. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/978-3-319-13054-5_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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57
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Liu C, Ponder JW, Marshall GR. Helix stability of oligoglycine, oligoalanine, and oligo-β-alanine dodecamers reflected by hydrogen-bond persistence. Proteins 2014; 82:3043-61. [PMID: 25116421 PMCID: PMC4206583 DOI: 10.1002/prot.24665] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 08/03/2014] [Indexed: 02/03/2023]
Abstract
Helices are important structural/recognition elements in proteins and peptides. Stability and conformational differences between helices composed of α- and β-amino acids as scaffolds for mimicry of helix recognition has become a theme in medicinal chemistry. Furthermore, helices formed by β-amino acids are experimentally more stable than those formed by α-amino acids. This is paradoxical because the larger sizes of the hydrogen-bonding rings required by the extra methylene groups should lead to entropic destabilization. In this study, molecular dynamics simulations using the second-generation force field, AMOEBA (Ponder, J.W., et al., Current status of the AMOEBA polarizable force field. J Phys Chem B, 2010. 114(8): p. 2549-64.) explored the stability and hydrogen-bonding patterns of capped oligo-β-alanine, oligoalanine, and oligoglycine dodecamers in water. The MD simulations showed that oligo-β-alanine has strong acceptor+2 hydrogen bonds, but surprisingly did not contain a large content of 3(12) -helical structures, possibly due to the sparse distribution of the 3(12) -helical structure and other structures with acceptor+2 hydrogen bonds. On the other hand, despite its backbone flexibility, the β-alanine dodecamer had more stable and persistent <3.0 Å hydrogen bonds. Its structure was dominated more by multicentered hydrogen bonds than either oligoglycine or oligoalanine helices. The 3(1) (PII) helical structure, prevalent in oligoglycine and oligoalanine, does not appear to be stable in oligo-β-alanine indicating its competition with other structures (stacking structure as indicated by MD analyses). These differences are among the factors that shape helical structural preferences and the relative stabilities of these three oligopeptides.
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Affiliation(s)
- Chengyu Liu
- Department of Chemistry, Washington University, St. Louis, Missouri, 63130
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58
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Synthetic fermentation of bioactive non-ribosomal peptides without organisms, enzymes or reagents. Nat Chem 2014; 6:877-84. [DOI: 10.1038/nchem.2048] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 07/28/2014] [Indexed: 12/28/2022]
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59
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Erős G, Kushida Y, Bode JW. A Reagent for the One-Step Preparation of Potassium Acyltrifluoroborates (KATs) from Aryl- and Heteroarylhalides. Angew Chem Int Ed Engl 2014; 53:7604-7. [DOI: 10.1002/anie.201403931] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2014] [Indexed: 01/22/2023]
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60
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Erős G, Kushida Y, Bode JW. A Reagent for the One-Step Preparation of Potassium Acyltrifluoroborates (KATs) from Aryl- and Heteroarylhalides. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403931] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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61
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He Z, Zajdlik A, Yudin AK. Air- and moisture-stable amphoteric molecules: enabling reagents in synthesis. Acc Chem Res 2014; 47:1029-40. [PMID: 24495255 DOI: 10.1021/ar400210c] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Researchers continue to develop chemoselective synthesis strategies with the goal of rapidly assembling complex molecules. As one appealing approach, chemists are searching for new building blocks that include multiple functional groups with orthogonal chemical reactivity. Amphoteric molecules that possess nucleophilic and electrophilic sites offer a versatile platform for the development of chemoselective transformations. As part of a program focused on new methods of synthesis, we have been developing this type of reagents. This Account highlights examples of amphoteric molecules developed by our lab since 2006. We have prepared and evaluated aziridine aldehydes, a class of stable unprotected α-amino aldehydes. Structurally, aziridine aldehydes include both a nucleophilic amine nitrogen and an electrophilic aldehyde carbon over the span of three atoms. Under ambient conditions, these compounds exist as homochiral dimers with an aziridine-fused five-membered cyclic hemiaminal structure. We have investigated chemoselective reactions of aziridine aldehydes that involve both the aziridine and aldehyde functionalities. These transformations have produced a variety of densely functionalized nitrogen-containing compounds, including amino aldehydes, 1,2-diamines, reduced hydantoins, C-vinyl or alkynyl aziridines, and macrocyclic peptides. We have also developed air- and moisture-stable α-boryl aldehydes, another class of molecules that are kinetically amphoteric. The α-boryl aldehydes contain a tetracoordinated N-methyliminodiacetyl (MIDA) boryl substituent, which stabilizes the α-metalloid carbonyl system and prevents isomerization to its O-bond enolate form. Primarily taking advantage of chemoselective transformations at the aldehyde functionality, these α-boryl aldehydes have allowed us to synthesize a series of new functionalized boron-containing compounds that are difficult or impossible to prepare using established protocols, such as α-borylcarboxylic acids, boryl alcohols, enol ethers, and enamides. Using α-borylcarboxylic acids as starting materials, we have also prepared several new amphoteric borylated reagents, such as α-boryl isocyanates, isocyanides, and acylboronates. These compounds are versatile building blocks in their own right, enabling the rapid synthesis of other boron-containing molecules.
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Affiliation(s)
- Zhi He
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
| | - Adam Zajdlik
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
| | - Andrei K. Yudin
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto M5S 3H6, Canada
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62
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Noda H, Erős G, Bode JW. Rapid Ligations with Equimolar Reactants in Water with the Potassium Acyltrifluoroborate (KAT) Amide Formation. J Am Chem Soc 2014; 136:5611-4. [DOI: 10.1021/ja5018442] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hidetoshi Noda
- Laboratorium
für Organische
Chemie, Department of Chemistry and Applied Biosciences, ETH−Zürich, 8093 Zürich, Switzerland
| | - Gábor Erős
- Laboratorium
für Organische
Chemie, Department of Chemistry and Applied Biosciences, ETH−Zürich, 8093 Zürich, Switzerland
| | - Jeffrey W. Bode
- Laboratorium
für Organische
Chemie, Department of Chemistry and Applied Biosciences, ETH−Zürich, 8093 Zürich, Switzerland
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63
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Noda H, Bode JW. Synthesis and chemoselective ligations of MIDA acylboronates with O-Me hydroxylamines. Chem Sci 2014. [DOI: 10.1039/c4sc00971a] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A chemoselective amide-bond forming ligation of N-methyliminodiacetyl (MIDA) acylboronates and O-Me hydroxylamines, including unprotected peptide substrates, is described.
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Affiliation(s)
- Hidetoshi Noda
- Laboratorium für Organische Chemie
- Departemnt of Chemistry and Applied Bioscience
- ETH Zürich
- 8093 Zurich, Switzerland
| | - Jeffrey W. Bode
- Laboratorium für Organische Chemie
- Departemnt of Chemistry and Applied Bioscience
- ETH Zürich
- 8093 Zurich, Switzerland
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64
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Taylor C, Bolshan Y. Metal-Free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts. Org Lett 2013; 16:488-91. [DOI: 10.1021/ol403370t] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Cassandra Taylor
- University of Ontario Institute of Technology (UOIT) 2000 Simcoe Street North, Oshawa, Ontario, Canada L1H 7K4
| | - Yuri Bolshan
- University of Ontario Institute of Technology (UOIT) 2000 Simcoe Street North, Oshawa, Ontario, Canada L1H 7K4
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65
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He Z, Trinchera P, Adachi S, St Denis JD, Yudin AK. Oxidative geminal functionalization of organoboron compounds. Angew Chem Int Ed Engl 2012; 51:11092-6. [PMID: 23038428 DOI: 10.1002/anie.201206501] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Indexed: 12/20/2022]
Abstract
Excellent tolerance: Stable acylboronates equipped with N-methyliminodiacetyl (MIDA) boryl groups ([B]) were prepared by using a sequence of oxidative manipulations at the boron-bound carbon center (green in scheme). Chemoselective transformations of these acylated organoboron building blocks yielded a range of multifunctionalized boron derivatives and supplied access to valuable borylated heterocycles (see scheme).
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Affiliation(s)
- Zhi He
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George St. Toronto, ON, M5S 3H6, Canada
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66
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He Z, Trinchera P, Adachi S, St. Denis JD, Yudin AK. Oxidative Geminal Functionalization of Organoboron Compounds. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206501] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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67
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Lennox AJJ, Lloyd-Jones GC. Preparation of Organotrifluoroborate Salts: Precipitation-Driven Equilibrium under Non-Etching Conditions. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203930] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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68
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Lennox AJJ, Lloyd-Jones GC. Preparation of Organotrifluoroborate Salts: Precipitation-Driven Equilibrium under Non-Etching Conditions. Angew Chem Int Ed Engl 2012; 51:9385-8. [DOI: 10.1002/anie.201203930] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Indexed: 11/10/2022]
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69
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Dumas AM, Molander GA, Bode JW. Amide-forming ligation of acyltrifluoroborates and hydroxylamines in water. Angew Chem Int Ed Engl 2012; 51:5683-6. [PMID: 22539274 DOI: 10.1002/anie.201201077] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Indexed: 02/01/2023]
Affiliation(s)
- Aaron M Dumas
- Laboratorium für Organische Chemie, Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology (ETH) Zürich, Wolfgang Pauli Strasse 10, 8093 Zürich, Switzerland
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