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Search for "characterisation" in Full Text gives 161 result(s) in Beilstein Journal of Organic Chemistry.

Exfoliated black phosphorous-mediated CuAAC chemistry for organic and macromolecular synthesis under white LED and near-IR irradiation

  • Azra Kocaarslan,
  • Zafer Eroglu,
  • Önder Metin and
  • Yusuf Yagci

Beilstein J. Org. Chem. 2021, 17, 2477–2487, doi:10.3762/bjoc.17.164

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  • multifunctional monomers, Az-3 and Alk-5. Photoinduced CuAAC between benzyl azide and various alkynesa using exfoliated BPNsb in DMSO-d6 = 1 g/L. Supporting Information Supporting Information File 308: Characterisation data: 1H NMR spectra of Alk-1, Alk-2 and Alk-3, TEM, HAADF-STEM and associated EDS elemental
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Published 23 Sep 2021

Allylic alcohols and amines by carbenoid eliminative cross-coupling using epoxides or aziridines

  • Matthew J. Fleming and
  • David M. Hodgson

Beilstein J. Org. Chem. 2021, 17, 2385–2389, doi:10.3762/bjoc.17.155

Graphical Abstract
  • . Supporting Information Supporting Information File 268: Experimental procedures and characterisation data for all new compounds. Acknowledgements We thank the EPSRC National Mass Spectrometry Service Centre for mass spectra. Funding The EPSRC and GlaxoSmithKline are acknowledged for a CASE studentship to M
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Published 10 Sep 2021

Regioselective N-alkylation of the 1H-indazole scaffold; ring substituent and N-alkylating reagent effects on regioisomeric distribution

  • Ryan M. Alam and
  • John J. Keating

Beilstein J. Org. Chem. 2021, 17, 1939–1951, doi:10.3762/bjoc.17.127

Graphical Abstract
  • reagent effects on N-1/N-2 regioselectivity.a Supporting Information Supporting Information File 318: Compound synthesis, characterisation, and copies of spectral data pertaining to regioisomeric distribution (N-1:N-2) determination. Funding This work was supported by funding from the Eli Lilly Research
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Published 02 Aug 2021

Chemical synthesis of C6-tetrazole ᴅ-mannose building blocks and access to a bioisostere of mannuronic acid 1-phosphate

  • Eleni Dimitriou and
  • Gavin J. Miller

Beilstein J. Org. Chem. 2021, 17, 1527–1532, doi:10.3762/bjoc.17.110

Graphical Abstract
  • % NaHCO3, EtOH, THF, rt, 24 h, 72%. Supporting Information Supporting Information File 218: Detailed experimental protocols and characterisation data; spectral NMR data (1H, 13C, 31P and HSQC NMR for compounds 2–5, 7–14, 16–18, 20 and 21). Acknowledgements We thank the EPSRC UK National Mass Spectrometry
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Letter
Published 05 Jul 2021

Heterogeneous photocatalytic cyanomethylarylation of alkenes with acetonitrile: synthesis of diverse nitrogenous heterocyclic compounds

  • Guanglong Pan,
  • Qian Yang,
  • Wentao Wang,
  • Yurong Tang and
  • Yunfei Cai

Beilstein J. Org. Chem. 2021, 17, 1171–1180, doi:10.3762/bjoc.17.89

Graphical Abstract
  • mechanistic study. Plausible mechanism of the CN-K-catalyzed cyanomethylarylation of alkenes. Optimization of the reaction conditions and control experimentsa. Supporting Information Supporting Information File 160: Full experimental details, compound characterisation, and copies of NMR spectra. Funding The
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Published 17 May 2021

Molecular basis for protein–protein interactions

  • Brandon Charles Seychell and
  • Tobias Beck

Beilstein J. Org. Chem. 2021, 17, 1–10, doi:10.3762/bjoc.17.1

Graphical Abstract
  • knowledge of protein–protein interactions, common characterisation methods to characterise them, and their role in protein complex formation with some examples. A deep understanding of protein–protein interactions and their molecular interactions is important for a number of applications, including drug
  • design. Protein–protein interactions and their discovery are thus an interesting avenue for understanding how protein complexes, which make up the majority of proteins, work. Keywords: characterisation methods; heterooligomeric complex; homooligomeric complex; molecular interactions; protein–protein
  • ], therapeutic interventions [8], and are crucial for potential drug discoveries [9]. This minireview will give a short insight into the different characterisation methods to characterise PPIs. Moreover, it will provide an examination of the different molecular interactions of PPIs and their role in protein
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Review
Published 04 Jan 2021

Chiral anion recognition using calix[4]arene-based ureido receptors in a 1,3-alternate conformation

  • Tereza Horáčková,
  • Jan Budka,
  • Vaclav Eigner,
  • Wen-Sheng Chung,
  • Petra Cuřínová and
  • Pavel Lhoták

Beilstein J. Org. Chem. 2020, 16, 2999–3007, doi:10.3762/bjoc.16.249

Graphical Abstract
  • characterisation data (including X-ray data for 4a, 7a, and 7d, NMR, IR, and HRMS) as well as NMR titration data. Funding This research was supported by the Czech Science Foundation (Grant 20-07833S). Financial support from specific university research (Grant No. A1 FCHT 2020 010) is also acknowledged.
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Published 07 Dec 2020

Computational tools for drawing, building and displaying carbohydrates: a visual guide

  • Kanhaya Lal,
  • Rafael Bermeo and
  • Serge Perez

Beilstein J. Org. Chem. 2020, 16, 2448–2468, doi:10.3762/bjoc.16.199

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  • structure as a central element in the characterisation of biological function. An adequate understanding of biomolecular mechanisms inherently requires our ability to model and visualise them. Visualisation of molecular structures is thus one of the most common tasks performed by structural biologists. As
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Published 02 Oct 2020

Naphthalene diimide bis-guanidinio-carbonyl-pyrrole as a pH-switchable threading DNA intercalator

  • Poulami Jana,
  • Filip Šupljika,
  • Carsten Schmuck and
  • Ivo Piantanida

Beilstein J. Org. Chem. 2020, 16, 2201–2211, doi:10.3762/bjoc.16.185

Graphical Abstract
  • Information Supporting Information File 552: Spectrophotometric characterisation in solution, NMR and HRMS data, additional experimental data on interactions with DNA/RNA. Acknowledgements The authors would like to thank late Prof. Dr. Carsten Schmuck not only for his essential contribution to this work but
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Published 08 Sep 2020

Lipophilicity trends upon fluorination of isopropyl, cyclopropyl and 3-oxetanyl groups

  • Benjamin Jeffries,
  • Zhong Wang,
  • Robert I. Troup,
  • Anaïs Goupille,
  • Jean-Yves Le Questel,
  • Charlene Fallan,
  • James S. Scott,
  • Elisabetta Chiarparin,
  • Jérôme Graton and
  • Bruno Linclau

Beilstein J. Org. Chem. 2020, 16, 2141–2150, doi:10.3762/bjoc.16.182

Graphical Abstract
  • , characterisation and copies of spectra of the novel compounds, details of the calculations, logP determinations of the nonfluorinated parents E1 and F1, and experimental measurements of the lipophilicities of the fluorinated derivatives. Funding We are grateful to AstraZeneca for a CASE award, and to the EPSRC
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Published 02 Sep 2020

GlypNirO: An automated workflow for quantitative N- and O-linked glycoproteomic data analysis

  • Toan K. Phung,
  • Cassandra L. Pegg and
  • Benjamin L. Schulz

Beilstein J. Org. Chem. 2020, 16, 2127–2135, doi:10.3762/bjoc.16.180

Graphical Abstract
  • diseased states [8]. The current state-of-the art technology for the characterisation, identification, and quantification of the glycome or glycoproteome is liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS) [9]. Popular and powerful glycoproteomic workflows typically involve standard
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Published 01 Sep 2020

Access to highly substituted oxazoles by the reaction of α-azidochalcone with potassium thiocyanate

  • Mysore Bhyrappa Harisha,
  • Pandi Dhanalakshmi,
  • Rajendran Suresh,
  • Raju Ranjith Kumar and
  • Shanmugam Muthusubramanian

Beilstein J. Org. Chem. 2020, 16, 2108–2118, doi:10.3762/bjoc.16.178

Graphical Abstract
  • of iron salts and solventsa. Supporting Information Supporting Information File 518: Full experimental details, compound characterisation, and copies of NMR spectra. Funding M. B. H. is grateful to Eurofins-Advinus Limited, Bangalore for support. P. D. thanks the Science and Engineering Research
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Published 31 Aug 2020

Facile synthesis of 7-alkyl-1,2,3,4-tetrahydro-1,8-naphthyridines as arginine mimetics using a Horner–Wadsworth–Emmons-based approach

  • Rhys A. Lippa,
  • John A. Murphy and
  • Tim N. Barrett

Beilstein J. Org. Chem. 2020, 16, 1617–1626, doi:10.3762/bjoc.16.134

Graphical Abstract
  • aldehydes.a Supporting Information Supporting Information File 94: Detailed experimental procedures, and product characterisation data, along with 1H and 13C NMR spectra. Acknowledgements Thanks to Sean M. Lynn for assistance with NMR spectroscopy analysis and the GSK UK Discovery Analytical team for
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Published 08 Jul 2020

Heterogeneous photocatalysis in flow chemical reactors

  • Christopher G. Thomson,
  • Ai-Lan Lee and
  • Filipe Vilela

Beilstein J. Org. Chem. 2020, 16, 1495–1549, doi:10.3762/bjoc.16.125

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  • chemistry as previously discussed. This combines the ease of separation and recyclability of a heterogeneous catalyst, with the detailed characterisation, accessibility and synthetic versatility of a homogeneous photocatalyst. Some desirable properties of a solid support are hence; (i) a strong
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Published 26 Jun 2020

Synthesis of novel multifunctional carbazole-based molecules and their thermal, electrochemical and optical properties

  • Nuray Altinolcek,
  • Ahmet Battal,
  • Mustafa Tavasli,
  • William J. Peveler,
  • Holly A. Yu and
  • Peter J. Skabara

Beilstein J. Org. Chem. 2020, 16, 1066–1074, doi:10.3762/bjoc.16.93

Graphical Abstract
  • sensor studies either directly or with small modifications. Here we report the synthesis, full characterisation and properties of these two novel compounds (7a and 7b). Results and Discussion Synthesis Compounds 7a and 7b were synthesised in four steps from carbazole (1) as depicted in Scheme 1
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Published 19 May 2020

Aerobic synthesis of N-sulfonylamidines mediated by N-heterocyclic carbene copper(I) catalysts

  • Faïma Lazreg,
  • Marie Vasseur,
  • Alexandra M. Z. Slawin and
  • Catherine S. J. Cazin

Beilstein J. Org. Chem. 2020, 16, 482–491, doi:10.3762/bjoc.16.43

Graphical Abstract
  • reaction between 6 and 8. Synthesis of copper-acetylide intermediate A via [Cu(Cl)(Triaz)]. Catalytic reaction involving copper-acetylide complex A. Catalyst and solvent optimisation.a,b Supporting Information Supporting Information File 139: Experimental and characterisation data. Supporting Information
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Published 24 Mar 2020

Synthesis of 3-alkenylindoles through regioselective C–H alkenylation of indoles by a ruthenium nanocatalyst

  • Abhijit Paul,
  • Debnath Chatterjee,
  • Srirupa Banerjee and
  • Somnath Yadav

Beilstein J. Org. Chem. 2020, 16, 140–148, doi:10.3762/bjoc.16.16

Graphical Abstract
  • . Results and Discussion Synthesis and characterisation of the Ru nanocatalyst The surfactant- and stabiliser-free RuNC was synthesised photochemically, based on a procedure that we have previously reported for the synthesis of Pd nanoparticles [46][47]. The synthesised RuNC, obtained directly after
  • Information Supporting Information File 90: Figures for the characterisation of the Ru nanocatalyst, detailed experimental procedures, and product characterisation data, along with 1H and 13C NMR spectra. Acknowledgements The TEM facilities of CUSAT Kochi and IACS Kolkata are gratefully acknowledged. The XPS
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Published 29 Jan 2020

An improved, scalable synthesis of Notum inhibitor LP-922056 using 1-chloro-1,2-benziodoxol-3-one as a superior electrophilic chlorinating agent

  • Nicky J. Willis,
  • Elliott D. Bayle,
  • George Papageorgiou,
  • David Steadman,
  • Benjamin N. Atkinson,
  • William Mahy and
  • Paul V. Fish

Beilstein J. Org. Chem. 2019, 15, 2790–2797, doi:10.3762/bjoc.15.271

Graphical Abstract
  • non-CNS disease. Results and Discussion Improved synthesis of 1; first generation Our first complete synthesis of 1 is presented in Scheme 1 (see Supporting Information File 1 for experimental procedures and characterisation data). This short sequence starts with 4-chlorothieno[3,2-d]pyrimidine (3
  • -dimethylformamide; HBTU, O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate. Mouse pharmacokinetic data for 1; oral (p.o.) dose at 10 mg/kg.a Supporting Information (1) experimental procedures and characterisation data for 3–10 and 1; (2) mouse PK data which includes: study design summary
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Published 19 Nov 2019

Nanangenines: drimane sesquiterpenoids as the dominant metabolite cohort of a novel Australian fungus, Aspergillus nanangensis

  • Heather J. Lacey,
  • Cameron L. M. Gilchrist,
  • Andrew Crombie,
  • John A. Kalaitzis,
  • Daniel Vuong,
  • Peter J. Rutledge,
  • Peter Turner,
  • John I. Pitt,
  • Ernest Lacey,
  • Yit-Heng Chooi and
  • Andrew M. Piggott

Beilstein J. Org. Chem. 2019, 15, 2631–2643, doi:10.3762/bjoc.15.256

Graphical Abstract
  • characterisation of A. nanangensis will be reported elsewhere in due course. Herein, we report the isolation, structure elucidation and bioassay of a family of drimane sesquiterpenoids from A. nanangensis, which we named the nanangenines. Notably, A. nanangensis distinguishes itself within the genus by the
  • profile. Preparative cultivation, extraction and isolation Two preparative-scale cultivations were carried out to produce sufficient quantities of the nanangenine family for characterisation and bioassay. Cultivation conditions were identical with the exception of growth medium. Culture A was prepared
  • , 20 mL min−1) to yield nanangenine D (5; tR = 21.8 min; 29.9 mg). Fraction 5 (24.4 mg) was purified by isocratic preparative HPLC (Zorbax C18, isocratic 75% MeCN/H2O, 20 mL min−1) to yield nanangenine E (7; tR = 12.8 min; 8.7 mg). Characterisation of compounds Nanangenine A (1): white powder; [α]D20
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Published 05 Nov 2019

Safe and highly efficient adaptation of potentially explosive azide chemistry involved in the synthesis of Tamiflu using continuous-flow technology

  • Cloudius R. Sagandira and
  • Paul Watts

Beilstein J. Org. Chem. 2019, 15, 2577–2589, doi:10.3762/bjoc.15.251

Graphical Abstract
  • reaction was quenched within the flow reactor using aqueous HCl (0.11 M, 1.1 equiv) when necessary. Samples were collected and analysed using HPLC resulting in 4.84 min retention time for azide 5. For characterisation, an appropriate amount of toluene and water was added to the reaction mixture after
  • thermally controlled microreactor system which was fitted with a 10 bar back pressure regulator. NaN3, DPPA, TMSA and TBAA were the various azidating agents investigated. Samples were collected and analysed using HPLC resulting in 4.84 min retention time for azide 5. For characterisation, the reaction
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Published 30 Oct 2019

Formation of alkyne-bridged ferrocenophanes using ring-closing alkyne metathesis on 1,1’-diacetylenic ferrocenes

  • Celine Bittner,
  • Dirk Bockfeld and
  • Matthias Tamm

Beilstein J. Org. Chem. 2019, 15, 2534–2543, doi:10.3762/bjoc.15.246

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  • characterisation, crystallographic data. Acknowledgements The authors wish to thank Dr. Holger Ott from Bruker AXS Inc., Karlsruhe, for the crystal structure determination of compound 4.
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Published 24 Oct 2019

An overview of the cycloaddition chemistry of fulvenes and emerging applications

  • Ellen Swan,
  • Kirsten Platts and
  • Anton Blencowe

Beilstein J. Org. Chem. 2019, 15, 2113–2132, doi:10.3762/bjoc.15.209

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  • ] activity, respectively. Soldier nasute termites use secretion of tetracyclic kempane skeletons as a defence mechanism [131], so their complete synthesis would invite further characterisation of the termite species. In a comprehensive study by Hong et al., precursor skeletons to kigelinol and kempane
  • increase the nucleophilic character, and stabilise the fulvene system (see dipolar forms in Scheme 1). Similar results have been observed by other groups [32][96][124][203]. Whilst many of the documented reactions focus on chemical synthesis and characterisation rather than applications, several
  • al. developed a programmable enantioselective one-pot synthesis of molecules with eight stereocentres greatly improving the efficiency of natural product synthesis [83]. Each of these natural products are biologically active, hence their total synthesis will allow further characterisation of their
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Published 06 Sep 2019

Genome mining in Trichoderma viride J1-030: discovery and identification of novel sesquiterpene synthase and its products

  • Xiang Sun,
  • You-Sheng Cai,
  • Yujie Yuan,
  • Guangkai Bian,
  • Ziling Ye,
  • Zixin Deng and
  • Tiangang Liu

Beilstein J. Org. Chem. 2019, 15, 2052–2058, doi:10.3762/bjoc.15.202

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  • characterised by GC–MS and 1D and 2D NMR, revealing a 5/6 bicyclic sesquiterpene and its C-11 esterified structure. Based on a literature search, to our knowledge, this is the first report of the characterisation of a sesquiterpene synthase in T. viride. In addition, this study demonstrates the effectiveness of
  • Trichoderma, such as trichodiene synthase homologous gene isolation and characterisation in T. harzianum [32] and functional identification of terpene synthase vir4 in T. virens [33]. However, owing to the general lack of previous studies of terpene synthases in T. viride, Tvi09626 is the first terpene
  • metabolic engineering strategy was used to reconstruct an FPP overproduction platform in S. cerevisiae in order to obtain sufficient quantities of the products of Tvi09626 for chemical structural characterisation. S. cerevisiae YZL141, engineered previously [21], was used owing to its ability to provide
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Published 28 Aug 2019

Bipolenins K–N: New sesquiterpenoids from the fungal plant pathogen Bipolaris sorokiniana

  • Chin-Soon Phan,
  • Hang Li,
  • Simon Kessler,
  • Peter S. Solomon,
  • Andrew M. Piggott and
  • Yit-Heng Chooi

Beilstein J. Org. Chem. 2019, 15, 2020–2028, doi:10.3762/bjoc.15.198

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  • research was undertaken with the assistance of resources and services from the National Computational Infrastructure (NCI), which is supported by the Australian Government. Authors acknowledge the facilities of Microscopy Australia at the Centre for Microscopy, Characterisation & Analysis, The University
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Published 26 Aug 2019

Isolation and characterisation of irinans, androstane-type withanolides from Physalis peruviana L.

  • Annika Stein,
  • Dave Compera,
  • Bianka Karge,
  • Mark Brönstrup and
  • Jakob Franke

Beilstein J. Org. Chem. 2019, 15, 2003–2012, doi:10.3762/bjoc.15.196

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Published 23 Aug 2019
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