51
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Reay AJ, Hammarback LA, Bray JTW, Sheridan T, Turnbull D, Whitwood AC, Fairlamb IJS. Mild and Regioselective Pd(OAc) 2-Catalyzed C-H Arylation of Tryptophans by [ArN 2]X, Promoted by Tosic Acid. ACS Catal 2017; 7:5174-5179. [PMID: 28824821 PMCID: PMC5557615 DOI: 10.1021/acscatal.6b03121] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 06/10/2017] [Indexed: 01/08/2023]
Abstract
![]()
A regioselective
Pd-mediated C–H bond arylation methodology
for tryptophans, utilizing stable aryldiazonium salts, affords C2-arylated
tryptophan derivatives, in several cases quantitatively. The reactions
proceed in air, without base, and at room temperature in EtOAc. The
synthetic methodology has been evaluated and compared against other
tryptophan derivative arylation methods using the CHEM21 green chemistry
toolkit. The behavior of the Pd catalyst species has been probed in
preliminary mechanistic studies, which indicate that the reaction
is operating homogeneously, although Pd nanoparticles are formed during
substrate turnover. The effects of these higher order Pd species on
catalysis, under the reaction conditions examined, appear to be minimal:
e.g., acting as a Pd reservoir in the latter stages of substrate turnover
or as a moribund form (derived from catalyst deactivation). We have
determined that TsOH shortens the induction period observed when [ArN2]BF4 salts are employed with Pd(OAc)2. Pd(OTs)2(MeCN)2 was found to be a superior
precatalyst (confirmed by kinetic studies) in comparison to Pd(OAc)2.
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Affiliation(s)
- Alan J. Reay
- Department of Chemistry, University of York, York YO10 5DD, U.K
| | | | | | - Thomas Sheridan
- Department of Chemistry, University of York, York YO10 5DD, U.K
| | - David Turnbull
- Department of Chemistry, University of York, York YO10 5DD, U.K
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52
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Mendive-Tapia L, Subiros-Funosas R, Zhao C, Albericio F, Read ND, Lavilla R, Vendrell M. Preparation of a Trp-BODIPY fluorogenic amino acid to label peptides for enhanced live-cell fluorescence imaging. Nat Protoc 2017; 12:1588-1619. [PMID: 28703788 DOI: 10.1038/nprot.2017.048] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Fluorescent peptides are valuable tools for live-cell imaging because of the high specificity of peptide sequences for their biomolecular targets. When preparing fluorescent versions of peptides, labels must be introduced at appropriate positions in the sequences to provide suitable reporters while avoiding any impairment of the molecular recognition properties of the peptides. This protocol describes the preparation of the tryptophan (Trp)-based fluorogenic amino acid Fmoc-Trp(C2-BODIPY)-OH and its incorporation into peptides for live-cell fluorescence imaging-an approach that is applicable to most peptide sequences. Fmoc-Trp(C2-BODIPY)-OH contains a BODIPY (4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) fluorogenic core, which works as an environmentally sensitive fluorophore, showing high fluorescence in lipophilic conditions. It is attached to Trp via a spacer-free C-C linkage, resulting in a labeled amino acid that can mimic the molecular interactions of Trp, enabling wash-free imaging. This protocol covers the chemical synthesis of the fluorogenic amino acid Fmoc-Trp(C2-BODIPY)-OH (3-4 d), the preparation of the labeled antimicrobial peptide BODIPY-cPAF26 by solid-phase synthesis (6-7 d) and its spectral and biological characterization as a live-cell imaging probe for different fungal pathogens. As an example, we include a procedure for using BODIPY-cPAF26 for wash-free imaging of fungal pathogens, including real-time visualization of Aspergillus fumigatus (5 d for culturing, 1-2 d for imaging).
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Affiliation(s)
- Lorena Mendive-Tapia
- Department of Inorganic and Organic Chemistry, University of Barcelona, Barcelona, Spain
| | - Ramon Subiros-Funosas
- Medical Research Council/University of Edinburgh Centre for Inflammation Research, The University of Edinburgh, Edinburgh, UK
| | - Can Zhao
- Manchester Fungal Infection Group, Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, UK
| | - Fernando Albericio
- Department of Inorganic and Organic Chemistry, University of Barcelona, Barcelona, Spain.,Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - Nick D Read
- Manchester Fungal Infection Group, Division of Infection, Immunity and Respiratory Medicine, University of Manchester, Manchester, UK
| | - Rodolfo Lavilla
- Networking Centre on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain.,Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, Barcelona, Spain
| | - Marc Vendrell
- Medical Research Council/University of Edinburgh Centre for Inflammation Research, The University of Edinburgh, Edinburgh, UK
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53
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Gao Y, Zhu W, Yin L, Dong B, Fu J, Ye Z, Xue F, Jiang C. Palladium-catalyzed direct C2-arylation of free (N H) indoles via norbornene-mediated regioselective C H activation. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.066] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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54
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Tomakinian T, Hamdan HA, Denizot N, Guillot R, Baltaze JP, Kouklovsky C, Vincent G. Evaluation of an NIS-Mediated Oxidative Cyclisation of Phenol-Containing N
-Acyltryptamine Precursors towards Phalarine: Synthesis of 4′,5′-Dihydrospiro[indole-3,6′-[1,3]oxazine]s. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601563] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Terry Tomakinian
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Hussein Abou Hamdan
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Natacha Denizot
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Régis Guillot
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Jean-Pierre Baltaze
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Cyrille Kouklovsky
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
| | - Guillaume Vincent
- Univ Paris Sud; CNRS; Université Paris-Saclay; Institut de Chimie moléculaire et des Matériaux d'Orsay (ICMMO); Equipe Méthodologie, Synthèse et molécules Thérapeutique (MS&MT); Bat. 410 91405 Orsay France
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55
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56
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Gu CX, Bi QW, Gao CK, Wen J, Zhao ZG, Chen Z. Post-synthetic modification of tryptophan containing peptides via NIS mediation. Org Biomol Chem 2017; 15:3396-3400. [DOI: 10.1039/c7ob00329c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A new method to provide modified tryptophan peptides through NIS mediated N2-selective coupling of a Trp unit with 1,2,3-triazoles, of which, the preliminary spectral properties were studied.
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Affiliation(s)
- Chen-Xue Gu
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
| | - Qing-Wei Bi
- College of Chemistry & Environment Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- China
| | - Chu-Kun Gao
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
| | - Jian Wen
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
| | - Zhi-Gang Zhao
- College of Chemistry & Environment Protection Engineering
- Southwest University for Nationalities
- Chengdu 610041
- China
| | - Zili Chen
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
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57
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Subiros-Funosas R, Mendive-Tapia L, Sot J, Pound JD, Barth N, Varela Y, Goñi FM, Paterson M, Gregory CD, Albericio F, Dransfield I, Lavilla R, Vendrell M. A Trp-BODIPY cyclic peptide for fluorescence labelling of apoptotic bodies. Chem Commun (Camb) 2017; 53:945-948. [DOI: 10.1039/c6cc07879f] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We describe the synthesis and characterization of a Trp-BODIPY fluorogenic peptide for labelling subcellular bodies released by human apoptotic cells.
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58
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Muralirajan K, Prakash S, Cheng CH. Cobalt-Catalyzed Mild Ring-Opening Addition of Arenes C−H Bond to 7-Oxabicyclic Alkenes. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201601026] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
| | - Sekar Prakash
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
| | - Chien-Hong Cheng
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
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59
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Noisier AFM, García J, Ionuţ IA, Albericio F. Stapled Peptides by Late-Stage C(sp3
)−H Activation. Angew Chem Int Ed Engl 2016; 56:314-318. [DOI: 10.1002/anie.201608648] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Anaïs F. M. Noisier
- Institute for Research in Biomedicine (IRB-Barcelona); Baldiri Reixac 10 08028 Barcelona Spain
| | - Jesús García
- Institute for Research in Biomedicine (IRB-Barcelona); Baldiri Reixac 10 08028 Barcelona Spain
| | - Ioana A. Ionuţ
- Institute for Research in Biomedicine (IRB-Barcelona); Baldiri Reixac 10 08028 Barcelona Spain
- Pharmaceutical Chemistry Department; Faculty of Pharmacy; Iuliu Hatieganu University of Medicine and Pharmacy; 41 Victor Babes St. 400012 Cluj-Napoca Romania
| | - Fernando Albericio
- Institute for Research in Biomedicine (IRB-Barcelona); Baldiri Reixac 10 08028 Barcelona Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine; Baldiri Reixac 10 08028 Barcelona Spain
- Department of Organic Chemistry; University of Barcelona; Barcelona Science Park; Baldiri Reixac 10 08028 Barcelona Spain
- School of Chemistry and Physics; University of KwaZulu-Natal; Durban 4001 South Africa
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60
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Noisier AFM, García J, Ionuţ IA, Albericio F. Stapled Peptides by Late‐Stage C(sp
3
)−H Activation. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608648] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Anaïs F. M. Noisier
- Institute for Research in Biomedicine (IRB-Barcelona) Baldiri Reixac 10 08028 Barcelona Spain
| | - Jesús García
- Institute for Research in Biomedicine (IRB-Barcelona) Baldiri Reixac 10 08028 Barcelona Spain
| | - Ioana A. Ionuţ
- Institute for Research in Biomedicine (IRB-Barcelona) Baldiri Reixac 10 08028 Barcelona Spain
- Pharmaceutical Chemistry Department Faculty of Pharmacy Iuliu Hatieganu University of Medicine and Pharmacy 41 Victor Babes St. 400012 Cluj-Napoca Romania
| | - Fernando Albericio
- Institute for Research in Biomedicine (IRB-Barcelona) Baldiri Reixac 10 08028 Barcelona Spain
- CIBER-BBN Networking Centre on Bioengineering, Biomaterials and Nanomedicine Baldiri Reixac 10 08028 Barcelona Spain
- Department of Organic Chemistry University of Barcelona Barcelona Science Park Baldiri Reixac 10 08028 Barcelona Spain
- School of Chemistry and Physics University of KwaZulu-Natal Durban 4001 South Africa
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61
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Arun V, Pilania M, Kumar D. Access to 2-Arylindoles via Decarboxylative C−C Coupling in Aqueous Medium and to Heteroaryl Carboxylates under Base-Free Conditions using Diaryliodonium Salts. Chem Asian J 2016; 11:3345-3349. [DOI: 10.1002/asia.201601290] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Velladurai Arun
- Department of Chemistry; Birla Institute of Technology and Science; Pilani- 333031 Rajasthan India
| | - Meenakshi Pilania
- Department of Chemistry; Birla Institute of Technology and Science; Pilani- 333031 Rajasthan India
| | - Dalip Kumar
- Department of Chemistry; Birla Institute of Technology and Science; Pilani- 333031 Rajasthan India
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62
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Marzo L, Ghosh I, Esteban F, König B. Metal-Free Photocatalyzed Cross Coupling of Bromoheteroarenes with Pyrroles. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01452] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Leyre Marzo
- Institute
of Organic Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Indrajit Ghosh
- Institute
of Organic Chemistry, University of Regensburg, D-93040 Regensburg, Germany
| | - Francisco Esteban
- Department
of Organic Chemistry (Modulo I), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Burkhard König
- Institute
of Organic Chemistry, University of Regensburg, D-93040 Regensburg, Germany
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63
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Théveau L, Schneider C, Fruit C, Hoarau C. Orthogonal Palladium-Catalyzed Direct C−H Bond Arylation of Heteroaromatics with Aryl Halides. ChemCatChem 2016. [DOI: 10.1002/cctc.201600489] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Laure Théveau
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF; 1 rue Tesnière 76821 Mont Saint Aignan Cedex France
| | - Cédric Schneider
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF; 1 rue Tesnière 76821 Mont Saint Aignan Cedex France
| | - Corinne Fruit
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF; 1 rue Tesnière 76821 Mont Saint Aignan Cedex France
| | - Christophe Hoarau
- Normandie Univ, COBRA, UMR 6014 et FR 3038; Univ Rouen; INSA Rouen; CNRS, IRCOF; 1 rue Tesnière 76821 Mont Saint Aignan Cedex France
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64
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Mendive-Tapia L, Bertran A, García J, Acosta G, Albericio F, Lavilla R. Constrained Cyclopeptides: Biaryl Formation through Pd-Catalyzed C−H Activation in Peptides-Structural Control of the Cyclization vs. Cyclodimerization Outcome. Chemistry 2016; 22:13114-9. [DOI: 10.1002/chem.201601832] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Lorena Mendive-Tapia
- Institute for Research in Biomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
| | - Alexandra Bertran
- Institute for Research in Biomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
| | - Jesús García
- Institute for Research in Biomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
| | - Gerardo Acosta
- CIBER-BBN; Networking Centre in Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
| | - Fernando Albericio
- CIBER-BBN; Networking Centre in Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
- Department of Organic Chemistry; University of Barcelona; Martí i Franqués 1-11 08028 Barcelona Spain
- School of Chemistry; University of KwaZulu-Natal; 4001- Durban South Africa
| | - Rodolfo Lavilla
- CIBER-BBN; Networking Centre in Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
- Laboratory of Organic Chemistry; Faculty of Pharmacy; University of Barcelona, Barcelona Science Park; Baldiri Reixac 10-12 08028 Barcelona Spain
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65
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Yedage SL, Bhanage BM. Palladium-Catalyzed Deaminative Phenanthridinone Synthesis from Aniline via C–H Bond Activation. J Org Chem 2016; 81:4103-11. [DOI: 10.1021/acs.joc.6b00378] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Subhash L. Yedage
- Department of Chemistry, Institute of Chemical Technology, Mumbai 400 019, India
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66
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Tolnai GL, Brand JP, Waser J. Gold-catalyzed direct alkynylation of tryptophan in peptides using TIPS-EBX. Beilstein J Org Chem 2016; 12:745-9. [PMID: 27340466 PMCID: PMC4902029 DOI: 10.3762/bjoc.12.74] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 04/06/2016] [Indexed: 01/11/2023] Open
Abstract
The selective functionalization of peptides containing only natural amino acids is important for the modification of biomolecules. In particular, the installation of an alkyne as a useful handle for bioconjugation is highly attractive, but the use of a carbon linker is usually required. Herein, we report the gold-catalyzed direct alkynylation of tryptophan in peptides using the hypervalent iodine reagent TIPS-EBX (1-[(triisopropylsilyl)ethynyl]-1,2-benziodoxol-3(1H)-one). The reaction proceeded in 50-78% yield under mild conditions and could be applied to peptides containing other nucleophilic and aromatic amino acids, such as serine, phenylalanine or tyrosine.
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Affiliation(s)
- Gergely L Tolnai
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland; Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Jonathan P Brand
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland; Givaudan, Chemin de la parfumerie 5, 1214 Vernier, Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis, Ecole Polytechnique Fédérale de Lausanne, EPFL SB ISIC LCSO, BCH 4306, 1015 Lausanne, Switzerland
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67
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Spacer-free BODIPY fluorogens in antimicrobial peptides for direct imaging of fungal infection in human tissue. Nat Commun 2016; 7:10940. [PMID: 26956772 PMCID: PMC4786873 DOI: 10.1038/ncomms10940] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 02/03/2016] [Indexed: 12/12/2022] Open
Abstract
Fluorescent antimicrobial peptides are promising structures for in situ, real-time imaging of fungal infection. Here we report a fluorogenic probe to image Aspergillus fumigatus directly in human pulmonary tissue. We have developed a fluorogenic Trp-BODIPY amino acid with a spacer-free C-C linkage between Trp and a BODIPY fluorogen, which shows remarkable fluorescence enhancement in hydrophobic microenvironments. The incorporation of our fluorogenic amino acid in short antimicrobial peptides does not impair their selectivity for fungal cells, and enables rapid and direct fungal imaging without any washing steps. We have optimized the stability of our probes in human samples to perform multi-photon imaging of A. fumigatus in ex vivo human tissue. The incorporation of our unique BODIPY fluorogen in biologically relevant peptides will accelerate the development of novel imaging probes with high sensitivity and specificity.
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68
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Colletto C, Islam S, Juliá-Hernández F, Larrosa I. Room-Temperature Direct β-Arylation of Thiophenes and Benzo[b]thiophenes and Kinetic Evidence for a Heck-type Pathway. J Am Chem Soc 2016; 138:1677-83. [PMID: 26788885 PMCID: PMC4774971 DOI: 10.1021/jacs.5b12242] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
![]()
The
first example of a regioselective β-arylation of benzo[b]thiophenes and thiophenes at room temperature with aryl
iodides as coupling partners is reported. This methodology stands
out for its operational simplicity: no prefunctionalization of either
starting material is required, the reaction is insensitive to air
and moisture, and it proceeds at room temperature. The mild conditions
afford wide functional group tolerance, often with complete regioselectivity
and high yields, resulting in a highly efficient catalytic system.
Initial mechanistic studies, including 13C and 2H KIEs, suggest that this process occurs via a concerted carbo-palladation
across the thiophene double bond, followed by a base-assisted anti-elimination.
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Affiliation(s)
- Chiara Colletto
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,School of Biological and Chemical Sciences, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
| | - Saidul Islam
- School of Biological and Chemical Sciences, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
| | - Francisco Juliá-Hernández
- School of Biological and Chemical Sciences, Queen Mary University of London , Mile End Road, London E1 4NS, United Kingdom
| | - Igor Larrosa
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
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69
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González R, Mendive-Tapia L, Pastrian MB, Albericio F, Lavilla R, Cascone O, Iannucci NB. Enhanced antimicrobial activity of a peptide derived from human lysozyme by arylation of its tryptophan residues. J Pept Sci 2016; 22:123-8. [PMID: 26785822 DOI: 10.1002/psc.2850] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2015] [Revised: 12/03/2015] [Accepted: 12/14/2015] [Indexed: 02/03/2023]
Abstract
Antimicrobial peptides are valuable agents to fight antibiotic resistance. These amphipatic species display positively charged and hydrophobic amino acids. Here, we enhance the local hydrophobicity of a model peptide derived from human lysozyme (107RKWVWWRNR115) by arylation of its tryptophan (Trp) residues, which renders a positive effect on Staphylococcus aureus and Staphylococcus epidermidis growth inhibition. This site-selective modification was accessed by solid-phase peptide synthesis using the non-proteinogenic amino acid 2-aryltryptophan, generated by direct C-H activation from protected Trp. The modification brought about a relevant increase in growth inhibition: S. aureus was fully inhibited by arylation of Trp 112 and by only 10% by arylation of Trp 109 or 111, respect to the non-arylated peptide. On the other hand, S. epidermidis was fully inhibited by the three arylated peptides and the parent peptide. The minimum inhibitory concentration was significantly reduced for S. aureus depending on the arylation site.
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Affiliation(s)
- Rodrigo González
- Cathedra of Biotechnology, School of Pharmacy and Biochemistry, UBA, and NANOBIOTEC, UBA-CONICET, Junín 956, (1113), Buenos Aires, Argentina
| | - Lorena Mendive-Tapia
- Department of Organic Chemistry, School of Chemistry, University of Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain.,Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028, Barcelona, Spain.,CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028, Barcelona, Spain
| | - María B Pastrian
- Cathedra of Biotechnology, School of Pharmacy and Biochemistry, UBA, and NANOBIOTEC, UBA-CONICET, Junín 956, (1113), Buenos Aires, Argentina
| | - Fernando Albericio
- Department of Organic Chemistry, School of Chemistry, University of Barcelona, Martí i Franquès 1-11, 08028, Barcelona, Spain.,Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028, Barcelona, Spain.,CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park, Baldiri Reixac 10, 08028, Barcelona, Spain.,School of Chemistry and Physics, University of KwaZulu-Natal, Westville Campus, University Road, Westville, 4001, Durban, South Africa
| | - Rodolfo Lavilla
- Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, Barcelona Science Park, Baldiri Reixac 10-12, 08028, Barcelona, Spain
| | - Osvaldo Cascone
- Cathedra of Biotechnology, School of Pharmacy and Biochemistry, UBA, and NANOBIOTEC, UBA-CONICET, Junín 956, (1113), Buenos Aires, Argentina
| | - Nancy B Iannucci
- Cathedra of Biotechnology, School of Pharmacy and Biochemistry, UBA, and NANOBIOTEC, UBA-CONICET, Junín 956, (1113), Buenos Aires, Argentina
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70
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Devaraj K, Sollert C, Juds C, Gates PJ, Pilarski LT. Ru-catalysed C–H silylation of unprotected gramines, tryptamines and their congeners. Chem Commun (Camb) 2016; 52:5868-71. [DOI: 10.1039/c6cc00803h] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Directed and undirected Ru-catalysed C–H silylation of unprotected heteroarenes is presented which requires no protecting groups.
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Affiliation(s)
- K. Devaraj
- Department of Chemistry – BMC
- Uppsala University
- Uppsala
- Sweden
| | - C. Sollert
- Department of Chemistry – BMC
- Uppsala University
- Uppsala
- Sweden
| | - C. Juds
- Department of Chemistry – BMC
- Uppsala University
- Uppsala
- Sweden
| | - P. J. Gates
- School of Chemistry
- University of Bristol
- Cantock's Close
- Bristol
- UK
| | - L. T. Pilarski
- Department of Chemistry – BMC
- Uppsala University
- Uppsala
- Sweden
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71
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Junk L, Kazmaier U. Synthesis of indoles and tryptophan derivatives via photoinduced nitrene C–H insertion. Org Biomol Chem 2016; 14:2916-23. [DOI: 10.1039/c5ob02563j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Functionalized indoles and tryptophans can be obtained from stannylated alkenes and o-iodoanilines via Stille coupling.
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Affiliation(s)
- Lukas Junk
- Institute of Organic Chemistry
- Saarland University
- 66041 Saarbrücken
- Germany
| | - Uli Kazmaier
- Institute of Organic Chemistry
- Saarland University
- 66041 Saarbrücken
- Germany
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72
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Purohit VB, Karad SC, Patel KH, Raval DK. Palladium N-heterocyclic carbene catalyzed expected and unexpected C–C and C–N functionalization reactions of 1-aryl-3-methyl-1H-pyrazol-5(4H)-ones. RSC Adv 2016. [DOI: 10.1039/c6ra22779a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
A palladium N-heterocyclic carbene complex of vitamin B1 developed earlier in our laboratory was successfully employed as an efficient catalyst for the regioselective C–C and C–N functionalization reactions of 1-aryl-3-methyl-1H-pyrazol-5(4H)-ones.
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Affiliation(s)
- Vishal B. Purohit
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
| | - Sharad C. Karad
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
| | - Kirit H. Patel
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
| | - Dipak K. Raval
- Department of Chemistry
- Sardar Patel University
- Vallabh Vidyanagar-388 120
- India
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73
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Bartoccini F, Bartolucci S, Mari M, Piersanti G. A simple, modular synthesis of C4-substituted tryptophan derivatives. Org Biomol Chem 2016; 14:10095-10100. [DOI: 10.1039/c6ob01791f] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A straightforward, rapid, versatile, regio- and chemoselective approach for the synthesis of C4-substituted tryptophan derivatives is reported.
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Affiliation(s)
- F. Bartoccini
- Department of Biomolecular Sciences
- University of Urbino “Carlo Bo”
- 61029 Urbino
- Italy
| | - S. Bartolucci
- Department of Biomolecular Sciences
- University of Urbino “Carlo Bo”
- 61029 Urbino
- Italy
| | - M. Mari
- Department of Biomolecular Sciences
- University of Urbino “Carlo Bo”
- 61029 Urbino
- Italy
| | - G. Piersanti
- Department of Biomolecular Sciences
- University of Urbino “Carlo Bo”
- 61029 Urbino
- Italy
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74
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Xu J, Sharma N, Sharma UK, Li Z, Song G, Van der Eycken EV. Cationic Rhodium(III)-Catalyzed Direct C-2 Carboxamidation of Indoles with IsocyanatesviaCH Bond Functionalization. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500109] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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75
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76
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Zhu Y, Bauer M, Ackermann L. Late-Stage Peptide Diversification by Bioorthogonal Catalytic CH Arylation at 23 °C in H2O. Chemistry 2015; 21:9980-3. [DOI: 10.1002/chem.201501831] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Indexed: 12/12/2022]
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77
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Mendive-Tapia L, Preciado S, García J, Ramón R, Kielland N, Albericio F, Lavilla R. New peptide architectures through C-H activation stapling between tryptophan-phenylalanine/tyrosine residues. Nat Commun 2015; 6:7160. [PMID: 25994485 PMCID: PMC4455059 DOI: 10.1038/ncomms8160] [Citation(s) in RCA: 214] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 04/10/2015] [Indexed: 12/22/2022] Open
Abstract
Natural peptides show high degrees of specificity in their biological action. However, their therapeutical profile is severely limited by their conformational freedom and metabolic instability. Stapled peptides constitute a solution to these problems and access to these structures lies on a limited number of reactions involving the use of non-natural amino acids. Here, we describe a synthetic strategy for the preparation of unique constrained peptides featuring a covalent bond between tryptophan and phenylalanine or tyrosine residues. The preparation of such peptides is achieved in solution and on solid phase directly from the corresponding sequences having an iodo-aryl amino acid through an intramolecular palladium-catalysed C–H activation process. Moreover, complex topologies arise from the internal stapling of cyclopeptides and double intramolecular arylations within a linear peptide. Finally, as a proof of principle, we report the application to this new stapling method to relevant biologically active compounds. Macrocyclic, constrained peptides show promise in therapeutic applications due to the stable and defined conformations that can be produced. Here, the authors report a method to form macrocyclic peptides through C–H activation on tryptophan and coupling with iodo-substituted aryl amino acids
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Affiliation(s)
- Lorena Mendive-Tapia
- 1] Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain [2] Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain [3] CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine
| | - Sara Preciado
- Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain
| | - Jesús García
- Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain
| | - Rosario Ramón
- Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain
| | - Nicola Kielland
- Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain
| | - Fernando Albericio
- 1] Institute for Research in Biomedicine, Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain [2] Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Spain [3] CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine [4] School of Chemistry, Yachay Tech, Yachay City of Knowledge, 100119 Urcuqui, Ecuador
| | - Rodolfo Lavilla
- 1] Barcelona Science Park, Baldiri Reixac 10-12, 08028 Barcelona, Spain [2] Laboratory of Organic Chemistry, Faculty of Pharmacy, University of Barcelona, Avda. Joan XXII s.n., 08028 Barcelona, Spain
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78
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Tiwari VK, Kamal N, Kapur M. Ruthenium-Catalyzed Heteroatom-Directed Regioselective C–H Arylation of Indoles Using a Removable Tether. Org Lett 2015; 17:1766-9. [DOI: 10.1021/acs.orglett.5b00535] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Virendra Kumar Tiwari
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore Bypass
Road, Bhauri, Bhopal 462066, India
| | - Neha Kamal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore Bypass
Road, Bhauri, Bhopal 462066, India
| | - Manmohan Kapur
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore Bypass
Road, Bhauri, Bhopal 462066, India
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79
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Sollert C, Devaraj K, Orthaber A, Gates PJ, Pilarski LT. Ru-catalysed C-H arylation of indoles and pyrroles with boronic acids: scope and mechanistic studies. Chemistry 2015; 21:5380-6. [PMID: 25689052 PMCID: PMC4600241 DOI: 10.1002/chem.201405931] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Indexed: 12/28/2022]
Abstract
The Ru-catalysed C2–H arylation of indoles and pyrroles by using boronic acids under oxidative conditions is reported. This reaction can be applied to tryptophan derivatives and tolerates a wide range of functional groups on both coupling partners, including bromides and iodides, which can be further derivatised selectively. New indole-based ruthenacyclic complexes are described and investigated as possible intermediates in the reaction. Mechanistic studies suggest the on-cycle intermediates do not possess a para-cymene ligand and that the on-cycle metalation occurs through an electrophilic attack by the Ru centre.
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Affiliation(s)
- Carina Sollert
- Department of Chemistry-BMC, Uppsala University, Box 576, 75-123 Uppsala (Sweden), Fax: (+46) 18-471-38-18
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80
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ElMarrouni A, Heras M. Synthesis of new unnatural N(α)-Fmoc pyrimidin-4-one amino acids: use of the p-benzyloxybenzyloxy group as a pyrimidinone masking group. Org Biomol Chem 2015; 13:851-8. [PMID: 25407750 DOI: 10.1039/c4ob02235a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The p-benzyloxybenzyloxy group is used to mask the oxo function of the 4(3H)-pyrimidinone ring in the synthesis of new unnatural amino acids. The synthetic approach is based on an aromatic nucleophilic substitution reaction between 4-[4-(benzyloxy)benzyloxy]-2-(benzylsulfonyl)pyrimidine and the nucleophilic side chain of several N(α)-Boc amino esters, as the key step, followed by a series of standard protecting group transformations. p-Benzyloxybenzyloxy is efficiently removed under mild acid conditions to recover the 4(3H)-pyrimidinone system.
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Affiliation(s)
- Abdellatif ElMarrouni
- Department of Chemistry, Faculty of Science, University of Girona, Campus de Montilivi, E-17071 Girona, Spain.
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81
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Reay AJ, Williams TJ, Fairlamb IJS. Unified mild reaction conditions for C2-selective Pd-catalysed tryptophan arylation, including tryptophan-containing peptides. Org Biomol Chem 2015; 13:8298-309. [DOI: 10.1039/c5ob01174d] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mild Pd-mediated C–H functionalisation protocols, facilitating tryptophan C2-arylation, have been developed. Tryptophan-containing peptides, susceptible to oxidation, have been arylated.
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82
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Saoudi B, Debache A, Soulé JF, Doucet H. Synthesis of heteroarenes dyads from heteroarenes and heteroarylsulfonyl chlorides via Pd-catalyzed desulfitative C–H bond heteroarylations. RSC Adv 2015. [DOI: 10.1039/c5ra07762a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We report palladium-catalyzed synthesis of heteroarenes dyads using heteroarylsulfonyl chlorides as coupling partners. The C–H bond functionalizations occurred at α-position with pyrroles and furans, while at β-position with thiophenes.
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Affiliation(s)
- Besma Saoudi
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1 “Organométalliques, Matériaux et Catalyse”
- Campus de Beaulieu
- 35042 Rennes
- France
| | - Adbelmadjid Debache
- Laboratoire de synthèse des molecules à intérêt biologique Université Mentouri-Constantine
- 25000 Constantine
- Algeria
| | - Jean-François Soulé
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1 “Organométalliques, Matériaux et Catalyse”
- Campus de Beaulieu
- 35042 Rennes
- France
| | - Henri Doucet
- Institut des Sciences Chimiques de Rennes
- UMR 6226 CNRS-Université de Rennes 1 “Organométalliques, Matériaux et Catalyse”
- Campus de Beaulieu
- 35042 Rennes
- France
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83
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Iaroshenko VO, Gevorgyan A, Mkrtchyan S, Grigoryan T, Movsisyan E, Villinger A, Langer P. Regioselective Direct Arylation of Fused 3-Nitropyridines and Other Nitro-Substituted Heteroarenes: The Multipurpose Nature of the Nitro Group as a Directing Group. ChemCatChem 2014. [DOI: 10.1002/cctc.201402715] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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84
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Mari M, Lucarini S, Bartoccini F, Piersanti G, Spadoni G. Synthesis of 2-substituted tryptophans via a C3- to C2-alkyl migration. Beilstein J Org Chem 2014; 10:1991-8. [PMID: 25246958 PMCID: PMC4168769 DOI: 10.3762/bjoc.10.207] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 08/08/2014] [Indexed: 12/24/2022] Open
Abstract
The reaction of 3-substituted indoles with dehydroalanine (Dha) derivatives under Lewis acid-mediated conditions has been investigated. The formation of 2-substituted tryptophans is proposed to occur through a selective alkylative dearomatization–cyclization followed by C3- to C2-alkyl migration and rearomatization.
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Affiliation(s)
- Michele Mari
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Piazza del Rinascimento 6, 61029 Urbino (PU), Italy
| | - Simone Lucarini
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Piazza del Rinascimento 6, 61029 Urbino (PU), Italy
| | - Francesca Bartoccini
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Piazza del Rinascimento 6, 61029 Urbino (PU), Italy
| | - Giovanni Piersanti
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Piazza del Rinascimento 6, 61029 Urbino (PU), Italy
| | - Gilberto Spadoni
- Department of Biomolecular Sciences, University of Urbino "Carlo Bo", Piazza del Rinascimento 6, 61029 Urbino (PU), Italy
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85
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Noisier AFM, Brimble MA. C–H Functionalization in the Synthesis of Amino Acids and Peptides. Chem Rev 2014; 114:8775-806. [DOI: 10.1021/cr500200x] [Citation(s) in RCA: 422] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Anaïs F. M. Noisier
- School of Chemical Sciences
and the Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 23 Symonds Street, Auckland
Central 1010, New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences
and the Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 23 Symonds Street, Auckland
Central 1010, New Zealand
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86
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Maity S, Pathak S, Pramanik A. Substituted Benzo[a]carbazoles and Indoleacetic Acids from Arylglyoxals and Enamines through Domino Condensation, Thermal Cyclization, and Aromatization. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402085] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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87
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Liu C, Zhang W, Dai LX, You SL. Copper-Catalyzed C-2 Arylation or Vinylation of Indole Derivatives with Iodonium Salts. Chem Asian J 2014; 9:2113-8. [DOI: 10.1002/asia.201402071] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Indexed: 12/24/2022]
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88
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Liu Q, Fan W, Tian H. A highly efficient TfOH-assisted alkylation of azaindoles with α-phenylethanols. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.03.059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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89
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Hassanpour A, De Carufel CA, Bourgault S, Forgione P. Synthesis of 2,5-diaryl-substituted thiophenes as helical mimetics: towards the modulation of islet amyloid polypeptide (IAPP) amyloid fibril formation and cytotoxicity. Chemistry 2014; 20:2522-8. [PMID: 24488624 DOI: 10.1002/chem.201303928] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Indexed: 11/08/2022]
Abstract
A range of 2,5-diarylated thiophenes were synthesised as small molecule mimetics of the α-helix to modulate the amyloidogenesis and cytotoxic effect of islet amyloid polypeptide (IAPP). 3-Substituted thiophene-2-carboxylic acids were used as key intermediates and functionalised by palladium decarboxylative cross-coupling and direct C-H activation successively with overall yields ranging from 23 to 95 %. The effect of the ligands on IAPP amyloid fibril formation was evaluated with the thioflavin T (ThT) fluorescence-based assay. Furthermore, the capacity of these compounds to inhibit the cytotoxic effect of IAPP was assessed using β-pancreatic cells.
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Affiliation(s)
- Avid Hassanpour
- Concordia University, Department of Chemistry and Biochemistry, Pharmaqam, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6 (Canada)
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90
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Rossi R, Bellina F, Lessi M, Manzini C. Cross-Coupling of Heteroarenes by CH Functionalization: Recent Progress towards Direct Arylation and Heteroarylation Reactions Involving Heteroarenes Containing One Heteroatom. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300922] [Citation(s) in RCA: 366] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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91
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Williams TJ, Reay AJ, Whitwood AC, Fairlamb IJS. A mild and selective Pd-mediated methodology for the synthesis of highly fluorescent 2-arylated tryptophans and tryptophan-containing peptides: a catalytic role for Pd0 nanoparticles? Chem Commun (Camb) 2014; 50:3052-4. [DOI: 10.1039/c3cc48481e] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The C2-arylation of tryptophan derivatives, and small peptides containing tryptophan, is possible using a Pd/Cu co-catalyst system. The products are highly fluorescent, with potential for studying protein function.
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Affiliation(s)
| | - Alan J. Reay
- Department of Chemistry
- University of York
- York, UK YO10 5DD
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92
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Shi J, Zhao G, Wang X, Xu HE, Yi W. Rhodium(iii)-catalyzed regioselective C2-amidation of indoles with N-(2,4,6-trichlorobenzoyloxy)amides and its synthetic application to the development of a novel potential PPARγ modulator. Org Biomol Chem 2014; 12:6831-6. [DOI: 10.1039/c4ob00637b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Here an efficient rhodium(iii)-catalyzed C2-amidation of indoles and its synthetic application to a new PPARγ modulator have been developed.
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Affiliation(s)
- Jingjing Shi
- VARI/SIMM Center
- Center for Structure and Function of Drug Targets
- CAS-Key Laboratory of Receptor Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
| | - Guanguan Zhao
- VARI/SIMM Center
- Center for Structure and Function of Drug Targets
- CAS-Key Laboratory of Receptor Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
| | - Xiaowei Wang
- VARI/SIMM Center
- Center for Structure and Function of Drug Targets
- CAS-Key Laboratory of Receptor Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
| | - H. Eric Xu
- VARI/SIMM Center
- Center for Structure and Function of Drug Targets
- CAS-Key Laboratory of Receptor Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
| | - Wei Yi
- VARI/SIMM Center
- Center for Structure and Function of Drug Targets
- CAS-Key Laboratory of Receptor Research
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
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93
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Potukuchi HK, Bach T. Selective C-2 alkylation of tryptophan by a Pd(II)/norbornene-promoted C-H activation reaction. J Org Chem 2013; 78:12263-7. [PMID: 24237413 DOI: 10.1021/jo402107m] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A palladium(II)-catalyzed norbornene-mediated regioselective alkylation at the C-2 indole position of N-tert-butyloxycarbonyl (Boc)-protected (S)-tryptophan ethyl ester is reported. The protocol employs mild reaction conditions and is tolerant of a range of functional groups. The reaction proceeds without racemization at the stereogenic center of the amino acid.
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Affiliation(s)
- Harish Kumar Potukuchi
- Lehrstuhl für Organische Chemie I and Catalysis Research Center (CRC), Technische Universität München , Lichtenbergstrasse 4, 85747 Garching, Germany
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94
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Wang Q, Huang L, Wu X, Jiang H. Nucleopalladation Triggering the Oxidative Heck Reaction: A General Strategy to Diverse β-Indole Ketones. Org Lett 2013; 15:5940-3. [DOI: 10.1021/ol4027683] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Qian Wang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Liangbin Huang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Xia Wu
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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95
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Wang SH, Liu WJ, Zhan HY, Zhang H, Liang Y, Tian Y. Ligandless microwave-assisted Pd(OAc)2-catalyzed direct arylation of thiazolo[3,2-b]-1,2,4-triazoles. RSC Adv 2013. [DOI: 10.1039/c3ra44486d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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