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Assoc. Univ.-Prof. Dr. Mario Waser 

Associate Professor

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ResearcherID (F-5521-2010)

ORCID (0000-0002-8421-8642)

ScopusID (8518457600)

 

Group

Current Group Members

PhD Students

Master Students

  • Isabella Eder
  • Christopher Mairhofer
  • Katharina Röser
  • Roman Schütz
  • Lotte Stockhammer
  • David Weinzierl
  • Paul Zebrowski

Former Group Members

  • Stefan Aichhorn (MSc, 2012)
  • Andreas Buchroithner (MSc, 2016)
  • Vito Capaccio (Exchange PhD, 2018)
  • Raghunath Chowdhury (Postdoc, 2014)
  • Martin Ferry (Visiting PhD, 2017)
  • Christina Gaunersdorfer (MSc, 2016)
  • Katharina Gratzer (MSc, PhD: 2010-2014)
  • Guddeangadi N. Gururaja (Postdoc, 2012)
  • Richard Herchl (MSc, PhD: 2009-2013)
  • Stefan Humer (MSc, 2015)
  • Ondrej Kovac (Exchange PhD, 2018)
  • Viktoria Kreuzer (MSc, 2017)
  • Lucia Lenti (Visiting PhD, 2018)
  • Nicole Meisinger (MSc, 2016)
  • Johanna Novacek (MSc, PhD: 2012-2016)
  • Antonia Pichler (MSc, 2012)
  • Mathias Pichler (MSc, 2014)
  • Lukas Roiser (MSc, PhD: 2014-2018)
  • Johannes Schörgenhumer (MSc, PhD: 2015-2019)
  • Maximilian Tiffner (MSc, PhD: 2014-2018)
  • Katharina Zielke (MSc, PhD: 2015-2019)

Group News

Oct. 09th, 2019: Our paper describing the a-allylation of trifluoropyruvate-derived imines to access a-CF3-amino acid derivatives has been accepted for publication in the European Journal of Organic Chemistry.

Sept. 30th, 2019: Katharina Röser and Lotte Stockhammer join the group as Master students.

Sept. 26th, 2019: Isabella Eder receives a "Best Poster Award" at the 18. Österreichische Chemietage in Linz.

Sept. 12th, 2019: Johannes Schörgenhumer receives the "JKU Early Research Achievement Award" for his PhD thesis.

Aug. 6th, 2019: David Weinzierl joins the group as a Master student.

July 30th, 2019: Johannes Schörgenhumer successfully defends his PhD thesis. Unfortunately Mario will need a new climbing partner now as Johannes will join Cristina Nevado's group in Zürich as a postdoc soon. Take care Johannes and all the best for your future.

May 29th, 2019: Katharina Zielke successfully defends her PhD thesis. Kathi unfortunately left the group some months ago already to work as an R&D chemist for Thermo Fisher. Take care Kathi and all the best for your future.

May 24th, 2019: Our paper describing the formal (3+2)-cyclization between trifluoropyruvate-based imines and Michael acceptors to access a-CF3-containing proline derivatives has been accepted for publication in Organic and Biomolecular Chemistry.

April 24th, 2019: Our paper describing the asymmetric (4+1)-cyclization between allenoates and quinone methides has been accepted for publication in Chemistry - a European Journal.

Feb. 4th, 2019: Roman Schütz joins the group as a Master student.

Dec. 12th, 2018: Victoria Haider successfully defends her Master thesis. She will stay in our group to carry out future PhD studies.

Dec. 5th, 2018: Nicole Meisinger successfully defends her Master thesis.

Oct. 16th, 2018: Isabella Eder joins the group as a Master student.

Oct. 11th, 2018: Our paper describing the asymmetric phase transfer-catalysed b-addition of isoxazolidin-5-ones to MBH carbonates has been accepted for publication in Organic Chemistry Frontiers.

Oct. 8th, 2018: The Austrian Science Funds FWF generously funds a new stand alone project of our group to work on the "Asymmetric a-Functionalization of Carboxylic Acids/Esters" (P31784).

Oct. 1st, 2018: Our communication describing the transition metal-free synthesis of 1,3-diynes has been accepted for publication in Organic & Biomolecular Chemistry.

Oct. 1st, 2018: Paul Zebrowski joins the group as a Master student.

Sept. 3rd, 2018: Ondrej Kovac from the University of Olomouc (Czech Republic) joins the group as an exchange PhD student and will stay with us for the next 6 months.

August 13th, 2018: Our full paper describing the (4+1)-cyclization between vinylogous para-quinone methides and ammonium ylides has been accepted as a feature article for publication in Synthesis.

July 18th, 2018: Our collaborative full paper with Steven Kass (Minnesotta, USA) and Raphael Robiette (Louvain-la-Neuve, Belgium) on the use of charge-containing thiourea catalysts for CO2 fixation reactions with epoxides has been accepted for publication in the Journal of Organic Chemistry.

June 29th, 2018: Unfortunately Vito Capaccio's 6 month Erasmus stay in Linz is over and he "has" to go back to Salerno, Italy.  Take care Vito and all the best for the rest of your PhD.

June 22nd, 2018: Lukas Roiser successfully defends his PhD thesis and will luckily (at least for Mario) stay a bit longer to work on a collaborative project with Isabella Derler (Biophysics Department, JKU).

June 8th, 2018: Our collaborative full paper with Axel Zimmermann from Patheon/Thermo Fisher (Linz, Austria) on the use of Ru-SNS complexes as catalysts for hydrogenation and dehydrogenation reactions has been accepted for publication in Organic Process Research and Development.

May 25th, 2018: Maximilian Tiffner successfully defends his PhD thesis. Max already started to work as an R&D chemist for Patheon (part of Thermo Fisher) some months ago.

May 23rd, 2018: Our collaborative full paper together with the group of David Diaz Diaz (Regensburg) describing the use of ionene polymers for the CO2-fixation with epoxides has been accepted for publication in a special issue in Topics in Catalysis.

May 4th, 2018: Our full paper describing the formal (4+2)-annulation of Arylideneazlactones with Allenoates has been accepted for publication in the Asian Journal of Organic Chemistry.

March 4th, 2018: Lucia Lenti joins the group as an exchange student in the course of our collaborative H2020 RISE Project "Quatsalts".

Feb 26th, 2018: Michael Winter successfully defends his master thesis and graduates as DI. He will stay in our group to carry out future PhD studies.

Jan 18th, 2018: Our communication describing the formal (4+1)-annulation of ortho-Quinone Methides with Allenoates has been accepted for publication in Organic Letters.

Jan 12th, 2018: Our communication describing the synthesis of trifluoroacetyl-containing cyclopropanes by using ammonium and sulfonium ylides has been accepted for publication in European Journal of Organic Chemistry.

Jan 8th, 2018: Vito Capaccio from the University of Salerno (Italy) joins the group as an Erasmus exchange PhD student and will stay with us for the next 6 months.

Nov 30th, 2017: Johanna Novacek (now postdoc in Prof. Alois Fürstner's group in Mülheim, Germany) officially receives her promotion "Sub auspiciis Praesidentis" by the Austrian President Alexander Van der Bellen!

Mario (CV / Awards / Functions)

Curriculum Vitae

Since 11/2014: Associate Professor at the Institute of Organic Chemistry, JKU Linz.

06/2014: Habilitation (venia docendi) for organic chemistry - "Design of Tartaric Acid-Derived Chiral Organocatalysts and Development of Stereoselective Reaction Procedures" (Mentor: Prof. Dr. Norbert Müller).

Since 02/2011: Deputy Head of the Institute of Organic Chemistry, JKU Linz.

07/2009-10/2011: Assistant Professor at the Institute of Organic Chemistry, JKU Linz.

04/2007-06/2009: R&D Chemist DSM Fine Chemicals Austria, Linz.

02/2006-04/2007: Postdoc at the Max-Planck Institut für Kohlenforschung (Mülheim/Ruhr-Germany) in the group of Prof. Dr. Alois Fürstner, FWF - Erwin Schrödinger fellowship J2586 - "Totalsynthesis of the Iejimalides".

10/2003-10/2005: PhD thesis at the Institute of Organic Chemistry, JKU Linz in the group of Prof. Dr. Heinz Falk - "9,12-Disubstituted Hypericin Derivatives as Potential Second Generation Hypericin Based Photosensitizers" (FWF-Project P16969).

03/2003-09/2003: Diplomathesis in DSM Fine Chemicals Austria Linz under the supervision of Prof. Dr. Heinz Falk "Transition Metal Catalysed Oxidation of Benzylic Compounds using Ozone".

09/1998-09/2003: Student of WITECH (Technical Chemistry with additional basics in economics) at the Johannes Kepler University Linz.

27/09/1977: Born in Steyr, Austria

Awards and Fundings

02/2019: Outstanding Reviewer for Org. Biomol. Chem. in 2018.

02/2019: Awarded the "Golden Mitch" (ranked 1st) in the 2018/19 AG Linz "Vote Your Prof" student poll for the Faculty of Science and Engineering at the JKU.

Starting 04/2019: Standalone project funded by the Austrian Science Funds FWF „Asymmetric a-Functionalization of Carboxylic Acids/Esters“ (P31784)

10/2018: Awarded the "Golden Mitch" (ranked 1st) in the 2018 AG Linz "Vote Your Prof" student poll for the Faculty of Science and Engineering at the JKU.

04/2018: Aarded the "Silver Mitch" (ranked 2nd) in the 2017 AG Linz "Vote Your Prof" student poll for the Faculty of Science and Engineering at the JKU.

03/2018: Outstanding Reviewer for Org. Biomol. Chem. in 2017.

Since 01/2018: Standalone project funded by the Austrian Science Funds FWF „Syntheses of Chiral Fluorinated Amino Acids and Peptides“ (P30237)

11/2015: "Kardinal Innitzer Förderungspreis 2015" (Kardinal Innitzer Young Researcher Award 2015)

09/2014-10/2018: Funding of the Austrian Science Funds FWF of our project: "Syntheses of (Chiral) Hetero- and Carbocycles Using Ammonium Enolates" (P26387)

05/2012: JSP fellowship (Junior Scientists Participation Program) for the 47th Bürgenstock Conference (Brunnen, Switzerland).

02/2011: Selected as an Austrian representative for the 3rd EuCheMs Org Div Young Investigator Workshop in Crete

09/2010-09/2014: Standalone project funded by the Austrian Science Funds FWF: "Novel Tartaric Acid Derived Asymmetric Organocatalysts" (P22508)

01/2006: Erwin Schrödinger fellowship auf the Austrian Science Funds FWF for a Postdoc on the "Totalsynthesis of the Iejimalides" (02/2006 - 04/2007)

10/2004: Poster award CHI´s Discovery on Target – Boston

Memberships and Official Functions

Since 02/2018: Local GÖCH Chair for Upper Austria

09/2017: Chair of the Organizing Board of the “17th Blue Danube Symposium on Heterocyclic Chemistry” held in Linz (around 170 international participants)

Since 2017: Member of the Editorial Board of Chemical Data Collections

Since 2014: Member of the Editorial Board of Monatshefte für Chemie

2013-2017: Member of the Editorial Advisory Board of Current Organocatalysis

 

Research Interests and Funding

Generous financial support by the following agencies, institutions, and companies is gratefully acknowledged:

 

Austrian Science Funds (FWF)

Upper Austrian Government

Austrian National Funds for Research, Technology and Development

European Union (Marie Skłodowska-Curie action No 690882)

Patheon (part of Thermo Fischer)

 

General Research Interests

Organocatalytic Methods for the Synthesis of (Fluorinated) Biologically Active Compounds
Our group is interested in the use of chiral organocatalysts to access compounds or structural motives that are of interest to biological or medicinal chemists, either because of their biological properties themselves, or because of their versatility to serve as key-intermediates in the synthesis of biologically active target molecules. Hereby we have a target-driven approach as well as interest in the development of new methods to access such molecules in a more efficient way. Special focus hereby is on the development of asymmetric fluorination methods towards chiral fluorinated amino acids and peptides.
FWF Project: „Syntheses of Chiral Fluorinated Amino Acids and Peptides“ (P30237)
Marie Skłodowska-Curie action No 690882 "Quatsalts"

Bifunctional Chiral Ammonium Salt Catalysis
Chiral quaternary ammonium salt catalysis is one of the outstanding catalytic principles nowadays. Over the last years the importance of an additional catalytically active unit in these catalysts became obvious and thus we are highly interest in the development of novel bifunctional chiral quaternary ammonium salt catalysts and application thereof for novel transformations.

Ammonium Enolate Mediate Reactions
In addition to these ion pairing catalysis-based projects we are also interested in exploring the applicability of (a)chiral ammonium enolates for the stereoselective formation of small ring carbo- and heterocycles as well as for asymmetric a-functionalization reactions of simple esters and carboxylic acids. Hereby we focus on chiral auxiliary approaches (i.e. reactions of ammonium ylides) as well as on organocatalytic approaches using chiral nucleophilic catalysis. The hereby accessed structural motifs are highly important as they are often the functional groups of choice in key-intermediates in complex natural product syntheses and therefore we are highly interested in the development of alternative synthesis strategies for such compounds.
FWF Project: „Syntheses of (Chiral) Hetero- and Carbocycles Using Ammonium Enolates“ (P26387)
FWF Project: „Asymmetric a-Functionalization of Carboxylic Acids/Esters“ (P31784)

 

Running Projects

Asymmetric a-Functionalization of Carboxylic Acids/Esters
(FWF stand alone project P31784, since 04/2019)

The direct a-functionalization of simple acyclic carboxylic acid derivatives is a challenging task and this project aims on the development of new strategies to carry out such reactions in an asymmetric fashion. We will hereby rely on the use of chiral Lewis base catalysts which provide a highly reactive chiral ammonium enolate intermediate upon reaction with simple starting materials. This intermediate will then undergo the targeted asymmetric a-hetero- and carbofunctionalization reactions. The hereby accessed enantioenriched products are of high value for further applications and therefore this project will provide powerful tools to overcome challenging synthesis problem and will give access to a variety of interesting chiral small molecules in a so far unprecedented and highly efficient manner relying on simple starting materials.

 

Syntheses of Chiral Fluorinated Amino Acids and Peptides
(FWF stand alone project P30237, since 01/2018)

Abstract: The replacement of hydrogen atoms by fluorine in organic molecules has become a very important and powerful tool in various fields of research, mainly because of the fact that such a modification usually has a very dramatic effect on the physical, chemical, biological, and medical properties of these compounds. One class of fluorine containing compounds that has attracted a lot of interest for biomedical applications are fluorine containing amino acids and peptides. However, it is fair to say that the synthesis of chiral fluorinated amino acids or peptides still represents a major synthetic challenge. In this project plan to overcome this current limitation by establishing novel catalytic synthesis strategies to access chiral fluorinated a- and b-amino acid derivatives or peptides. Once successful, this project should thus deliver new powerful synthesis tools that will be of interest to organic and medicinal chemists and will finally give access to compounds that were not accessible with the existing state of the art methods.

Project Publications:
Please see publications 63, 67, and 68 from our general publication overview for first details about the research carried out in the course of this project.

 

Finished Projects

Syntheses of (Chiral) Hetero- and Carbocycles Using Ammonium Enolates
(FWF stand alone project P26387, 09/2014 - 10/2018)

Abstract: The development of powerful, generally applicable, and highly efficient synthetic transformations is one of the ultimate goals in (organic) chemistry, especially considering the increasing demand for complex molecules with a variety of different functions in our society nowadays (pharmaceutical applications, agrochemicals, material science,..). Amongst the frequently found structural motives, highly functionalized small and medium ring size chiral (hetero)-cycles are of uttermost importance, as they present the key-scaffold in a large variety of biologically active (natural) products. In addition they serve as versatile intermediates in the synthesis of biologically active molecules. Accordingly, novel powerful strategies to access them in an efficient, economic, and direct fashion are an important task, not only for organic chemists working academia, but also for medicinal chemists searching for new lead compounds or for industrial (pharmaceutical) applications.
The use of (chiral) ammonium enolates (either preformed or generated in situ by using a catalyst) to carry out demanding stereoselective reactions is a powerful and unique strategy, giving access to transformations that are not possible using any other (catalytic) methods. However, having a closer look at the use of this unique strategy to facilitate (stereoselective) organic reactions it is fair to say that, although impressive (stereoselective) examples have been reported recently, it seems reasonable that this methodology holds much more promise for further investigations and the development of significantly more complex and outstanding applications. Thus, it is the main target of this project to address transformations that will give access to a variety of highly important cyclic structural motives that represent major synthesis challenges, as other commonly employed methods are still not powerful enough.
Accordingly, this project will introduce versatile strategies to facilitate the activation and use of easily available starting materials in a unique and unprecedented fashion and thus will provide new powerful methodologies to the standard toolbox employed by chemists to obtain important highly functionalized cyclic compounds straightforwardly.

Project Publications:
Please see publications 31, 33, 35, 39, 40, 44, 47, 48, 49, 52, 53, 54, 56, 58, 61, 66 from our general publication overview for further details about the research carried out in the course of this project.

 

Chiral Ammonium Salts Meet Transition Metal Catalysis
(FWF Lise Meitner funding M1602, 02/2014 - 02/2015; PI: Dr Raghunath Chowdhury)

Abstract: The efficient and stereoselective construction of complex molecular architectures is one of the ultimate goals in chemistry and the use of small molecule organic catalysts (organocatalysts) has proven to be highly useful to achieve complex transformations starting from simple easily available starting materials in a large variety of different case studies. Hereby, non-covalent catalysis modes are amongst the most versatile approaches to mimic Nature, usually benefitting from mild and easy to handle reaction conditions, environmentally benign reagents, and high efficiencies. The use of chiral cations (especially chiral ammonium salt phase-transfer catalysts (PTCs)) as catalysts has obtained a prominent and outstanding position and has contributed significantly to the field of asymmetric catalysis. The enormous potential of these catalysts lies in the fact that (theoretically) every reaction involving anionic or even just highly Lewis basic intermediates (starting materials) can be affected and controlled by these cationic catalysts.
Considering the high potential of chiral PTCs to facilitate reactions where other methods clearly fail, we are confident that the use of chiral PTCs holds much promise to facilitate a series of highly demanding complex transformations, thus addressing some longstanding synthesis challenges. Although the synergistic combination of complementary activation modes has emerged as a powerful tool for complex transformations, it comes as a surprise that so far only a few reports about the synergistic combination of chiral PTCs with complementary activation modes have been published.
It is the main target of this project to carry out a systematic feasibility study of the combined use of chiral phase-transfer catalysts with complementary transition metal catalysts in a synergistic (or cascade) fashion. The high value of such an approach will be the benefit of employing the unique nucleophile-activation potential of chiral cation-based catalysts in combination with the well-described electrophile activating properties of transition metal catalysts. Accordingly, the successful implementation of the herein investigated reactions will broaden the field of asymmetric catalysis in general, as substrates which have so far not been useable in such approaches in a catalytic stereoselective manner can be directly employed to obtain valuable chiral compounds in just a single step. Thus this project should provide the community with outstanding new tools to solve longstanding problems and to get access to chiral building blocks that are otherwise only difficultly accessible in a stereoselective fashion under mild and environmentally friendly conditions by using easily tuneable and easy to handle catalysts.

Project Publications:
Please see publications 32 and 50 from our general publication overview for further details about the research carried out in the course of this project.

 

Novel Tartaric Acid Derived Asymmetric Organocatalysts
(FWF stand alone project P22508, 09/2010 - 09/2014)

Abstract: The ability to control the three-dimensional structure of the molecular architecture is one of the primary targets in synthetic organic chemistry. Amongst the various ways of creating enantiomerically enriched products, catalytic methods are considered to be the most appealing as the use of stoichiometric amounts of valuable chiral reagents can be avoided, thus making optimum use of the chiral pool. Besides enzymatic and metal catalyzed asymmetric transformations, the use of sub-stoichiometric amounts of organic molecules (so called organocatalysts) has proven to possess an enormous potential for the catalysis of stereoselective reactions. Among the easily available natural chiral sources, tartaric acid has obtained a prominent position not only for historical reasons, but especially due to the fact that both enantiomers are readily available from natural sources. Surprisingly, although tartaric acid derivatives are almost omnipresent in metal catalysis, their use as chiral organocatalysts has so far been limited to a few applications only. Due to the fact that tartaric acid represents a very unique carbon skeleton possessing electronic and steric properties different from other commonly used chiral moieties the primary target of this project is the synthesis of novel tartaric acid derived organocatalysts and their application in asymmetric catalysis. As both, L- and D-tartaric acid are easily and cheaply available, access to both enantiomers of new catalysts is guaranteed.
Among the different activation modes, which are hitherto known in organocatalysis, the main focus herein lies on the synthesis of chiral ammonium salts, chiral Lewis acids/bases, and bifunctional catalysts. These compounds should enable the catalysis of a wide variety of different fundamental reactions. Therefore, in each case the ability of the new catalysts for the asymmetric catalysis of reactions like alkylations, allylations, aldol type reactions, or cyclizations will be investigated. Furthermore, a careful investigation concerning the crucial structural parameters of the novel catalysts will be undertaken.
The development of these novel organocatalysts will broaden the scope of organocatalysis as it will make use of one of the most easily available and cheapest natural chiral sources which has so far not been exploited much in this field. Furthermore, due to the characteristic and unique structural features of these catalysts, different reactivities compared to the currently used organocatalysts seem to be possible.

Project Publications:
Please see publications 13, 15, 18, 21, 22, 23, 25, 26, 27, 29 from our general publication overview for further details about the research carried out in the course of this project.

 

Friends / Collaborators / Partners

Please check our publication list for further details on all our fruitful collaborations with the following groups:

Prof. Mauro Adamo, Royal College of Surgeons in Ireland (RCSI); Ireland

Prof. David Díaz Díaz, University of Regensburg, Germany

Prof. Steven Kass, University of Minnesota, US

Prof. Antonio Massa, University of Salerno, Italy

Prof. Jiří Pospíšil, Palacky University Olomouc, Czech Republic

Prof. Raphaël Robiette, Université catholique de Louvain, Belgium

Prof. Mathew Vetticatt, University of Binghamton, US

 

 

Publications

<2019>

68. "Pd-catalyzed allylation of imines to access a-CF3-substituted a-amino acid derivatives"
Michael Winter, Hyunwoo Kim, Mario Waser*
Eur. J. Org. Chem., 2019, accepted for publication. [full text]

67. "Synthesis of a-CF3-proline derivatives by means of a formal (3+2)-cyclisation between trifluoropyruvate imines and Michael acceptors"
Michael Winter, Kirill Faust, Markus Himmelsbach, Mario Waser*
Org. Biomol. Chem., 2019, 17, 5731-5735. [full text]

66. "Enantioselective Catalytic (4+1)-Cyclization of ortho-Hydroxy-para-Quinone Methides with Allenoates"
Katharina Zielke, Ondřej Kováč, Michael Winter, Jiří Pospíšil, Mario Waser*
Chem. Eur. J., 2019, 25, 8163-8168. [full text]

(Highlighted in Synfacts)

65. "(Thio)urea Containing Quaternary Ammonium Salts for the CO2-Fixation with Epoxides"
Johannes Schörgenhumer, Maximilian Tiffner, and Mario Waser*
Monatsh. Chem., 2019, 150, 789-794. [full text]

64. "Synthesis and Organocatalytic Asymmetric Nitro-aldol Initiated Cascade Reactions of 2-Acylbenzonitriles Leading to 3,3-Disubstituted Isoindolinones"
Fabio Romano, Antonia Di Mola, Laura Palombi, Maximilian Tiffner, Mario Waser,* and Antonio Massa*
Catalysts, 2019, 9, 327. [full text]

<2018>

63. "Asymmetric phase-transfer catalysed b-addition of isoxazolidin-5-ones to MBH carbonates"
Vito Capaccio, Katharina Zielke, Andreas Eitzinger, Antonio Massa, Laura Palombi, Kirill Faust, and Mario Waser*
Org. Chem. Front., 2018, 5, 3336-3340. [full text]

62. "Transition Metal-Free Coupling of Terminal Alkynes and Hypervalent Iodine-Based Alkyne-Transfer Reagents to Access Unsymmetrical 1,3-Diynes"
Johannes Schörgenhumer and Mario Waser*
Org. Biomol. Chem., 2018, 16, 7561-7563. [full text]

61. "Formal (4+1)-Cyclization of Ammonium Ylides with Vinylogous para-Quinone Methides"
Lukas Roiser, Katharina Zielke, and Mario Waser*
Synthesis, 2018, 50, 4047-4054. [full text]

60. "Synthesis of Cyclic Organic Carbonates Using Atmospheric Pressure CO2 and Charge-Containing Thiourea Catalysts"
Yang Fan, Maximilian Tiffner, Johannes Schörgenhumer, Raphaël Robiette, Mario Waser* and Steven R. Kass*
J. Org. Chem., 2018, 83, 9991−10000. [full text]

59. "SNS-Ligands for Ru-Catalyzed Homogeneous Hydrogenation and Dehydrogenation Reactions"
Johannes Schörgenhumer, Axel Zimmermann,* and Mario Waser*
Org. Process Res. Dev., 2018, 22, 862-870. [full text]

58. "Syntheses of Highly-Functionalized Spirocyclohexenes by Formal (4+2)-Annulation of Arylidene Azlactones with Allenoates "
Andreas Eitzinger, Katharina Zielke, Michael Widhalm, Raphaël Robiette,* and Mario Waser*
Asian J. Org. Chem., 2018, 7, 1620-1625. [full text]

57. "Cationic Polymers Bearing Quaternary Ammonium Groups-Catalyzed CO2 Fixation with Epoxides"
Maximilian Tiffner, Marleen Häring, David Díaz Díaz*, and Mario Waser*
Top. Catal., 2018, 61, 1545-1550. [full text]

56. "Ammonium Ylide-Mediated Cyclizations"
Lukas Roiser, Katharina Zielke, and Mario Waser*
Asian J. Org. Chem., 2018, 7, 852-864. [full text]

55. "Towards an Asymmetric Organocatalytic α-Azidation of β-Ketoesters"
Maximilian Tiffner, Lotte Stockhammer, Johannes Schörgenhumer, Katharina Röser, and Mario Waser*
Molecules, 2018, 23, 1142-1150. [full text]

54. "Formal (4+1)-Addition of Allenoates to ortho-Quinone Methides"
Katharina Zielke and Mario Waser*
Org. Lett., 2018, 20, 768-771. [full text]

53. "Synthesis of Trifluoroacetyl-Substituted Cyclopropanes Using Onium Ylides"
Michael Winter, Christina Gaunersdorfer, Lukas Roiser, Katharina Zielke, Uwe Monkowius, and Mario Waser*
Eur. J. Org. Chem., 2018, 418-421. [full text]

52. "Progress in the synthesis of δ-sultones"
Christina Gaunersdorfer and Mario Waser*
Monatsh. Chem., 2018, 149, 701-714. [full text]

<2017>

51. "Chiral Phase-Transfer Catalysis in the Asymmetric a-Heterofunctionalization of Prochiral Nucleophiles"
Johannes Schörgenhumer, Maximilian Tiffner, and Mario Waser*
Beilstein J. Org. Chem., 2017, 13, 1753-1769. [full text]

50. "Hypervalent Iodine-Mediated a-Arylation of Glycine Schiff Base"
Johannes Schörgenhumer, Raghunath Chowdhury,* and Mario Waser*
Chem. Data Collect., 2017, 11-12, 36-39. [full text]

49. "Enantioselective spirocyclopropanation of para-quinone methides using ammonium ylides"
Lukas Roiser and Mario Waser*
Org. Lett., 2017, 19, 2338-2341. [full text]

48. "CO2 Fixation with Epoxides under Mild Conditions with a Cooperative Metal Corrole - Quaternary Ammonium Salt Catalyst System"
Maximilian Tiffner, Sabrina Gonglach, Michael Haas, Wolfgang Schöfberger,* and Mario Waser*
Chem. Asian J., 2017, 12, 1048-1051. [full text]

47. "Asymmetric synthesis of 2,3-dihydrobenzofurans via a (4+1) annulation between ammonium ylides and in situ generated ortho-quinone methides"
Nicole Meisinger, Lukas Roiser, Uwe Monkowius, Markus Himmelsbach, Raphaël Robiette,* and Mario Waser*
Chem. Eur. J., 2017, 23, 5137-5142. [full text]

46. "On-Surface Site-Selective Cyclization of Corrole Radicals"
Stefano Tebi, Mateusz Paszkiewicz, Hazem Aldahhak, Francesco Allegretti, Sabrina Gonglach, Michael Haas, Mario Waser, Peter S. Deimel, Pablo Casado Aguilar, Yi-Qi Zhang, Anthoula C. Papageorgiou, David A. Duncan, Johannes V. Barth, Wolf G. Schmidt, Reinhold Koch, Uwe Gerstmann,* Eva Rauls,* Florian Klappenberger,* Wolfgang Schöfberger* and Stefan Müllegger*
ACS Nano, 2017, 11, 3383-3391. [full text]

45. "A systematic study on the use of different organocatalytic activation modes for asymmetric conjugated addition reactions of isoindolinones"
Francesco Scorzelli, Antonia Di Mola, Francesco De Piano, Consiglia Tedesco, Laura Palombi, Rosanna Filosa, Mario Waser and Antonio Massa*
Tetrahedron, 2017, 73, 819-828. [full text]

44. "On the origin of the stereoselectivity in chiral amide-based ammonium ylide-mediated epoxidations"
Johanna Novacek, Raphael Robiette, and Mario Waser*
Monatsh. Chem., 2017, 148, 77-81. [full text]

<2016>

43. "Bifunctional Ammonium Salt Catalyzed Asymmetric α-Hydroxylation of β-Ketoesters by Simultaneous Resolution of Oxaziridines"
Johanna Novacek, Joseph A. Izzo, Mathew J. Vetticatt, and Mario Waser*
Chem. Eur. J., 2016, 22, 17339-17344. [full text]

42. "New strategies and applications using electrophilic cyanide-transfer reagents under transition metal-free conditions"
Johannes Schörgenhumer and Mario Waser*
Org. Chem. Front., 2016, 3, 1535-1540. [full text]

41. "Phase-Transfer Catalysis with Ionene Polymers"
Maximilian Tiffner, Katharina Zielke, Judith Mayr, Marleen Häring, David Díaz Díaz,* and Mario Waser*
ChemistrySelect, 2016, 1, 4030–4033. [full text]

40. "Towards a General Understanding of Carbonyl-Stabilised Ammonium Ylide-Mediated Epoxidation Reactions"
Johanna Novacek, Lukas Roiser, Katharina Zielke, Raphaël Robiette,* and Mario Waser*
Chem. Eur. J., 2016, 22, 11422-11428. [full text]

39. "Benzylic Ammonium Ylide-Mediated Epoxidations"
Lukas Roiser, Raphaël Robiette,* and Mario Waser*
Synlett, 2016, 27, 1963-1968. [full text]

38. "Asymmetric tandem hemiaminal-heterocyclization-Aza-Mannich reaction of 2-formylbenzonitriles and amines using chiral phase transfer catalysis: an experimental and theoretical study"
Amedeo Capobianco,* Antonia Di Mola, Valentina Intintoli, Antonio Massa, Vito Capaccio, Lukas Roiser, Mario Waser, and Laura Palombi*
RSC Adv., 2016, 6, 31861-31870. [full text]

37. "Transition metal-free dimerization of alkynes using hypervalent iodine reagents"
Johannes Schörgenhumer and Mario Waser*
Tetrahedron Lett., 2016, 57, 1678-1680. [full text]

36. "Asymmetric α-Chlorination of β-Ketoesters Using Bifunctional Ammonium Salt Catalysis"
Johanna Novacek, Uwe Monkowius, Markus Himmelsbach, and Mario Waser*
Monatsh. Chem., 2016, 147, 533–538. [full text]

<2015>

35. "Bifunctional Phase Transfer Catalysis in the Asymmetric Synthesis of Biologically Active Isoindolinones"
Antonia Di Mola, Maximilian Tiffner, Francesco Scorzelli, Laura Palombi, Rosanna Filosa, Paolo De Caprariis, Mario Waser,* and Antonio Massa*
Beilstein J. Org. Chem., 2015, 11, 2591–2599. [full text]

34. "An organocatalytic biomimetic strategy paves the way for the asymmetric Umpolung of imines"
Mario Waser* and Johanna Novacek,
Angew. Chem., 2015, 127, 14434–14437, Angew. Chem. Int. Ed., 2015, 54, 14228–14231. [full text]

33. "Design of Chiral Urea-Quaternary Ammonium Salt Hybrid Catalysts for Asymmetric Reactions of Glycine Schiff Bases"
Maximilian Tiffner, Johanna Novacek, Alfonso Busillo, Katharina Gratzer, Antonio Massa,* and Mario Waser*
RSC Adv., 2015, 5, 78941-78949. [full text]

32. "Towards an asymmetric organocatalytic α-cyanation of β-ketoesters"
Raghunath Chowdhury, Johannes Schörgenhumer, Johanna Novacek, and Mario Waser*
Tetrahedron Lett., 2015, 56, 1911-1914. [full text]

31. "Asymmetric Syntheses of Three-Membered Heterocycles Using Chiral Amide-Based Ammonium Ylides"
Mathias Pichler, Johanna Novacek, Raphaël Robiette, Vanessa Poscher, Markus Himmelsbach, Uwe Monkowius, Norbert Müller and Mario Waser*
Org. Biomol. Chem., 2015, 13, 2092-2099. [full text]

 

<2014>

30."Stereoselective Cyclization Reactions under Phase-Transfer Catalysis"
Richard Herchl and Mario Waser*
Tetrahedron, 2014, 70, 1935-1960. [full text]

29. "Syntheses and Applications of (Thio)-Urea Containing Chiral Quaternary Ammonium Salt Catalysts"
Johanna Novacek and Mario Waser*
Eur. J. Org. Chem, 2014, 802-809. [full text]

28. "Thin-layer chromatography-spray mass spectrometry: A method for easy identification of synthesis products and UV filters from TLC aluminum foils"
Markus Himmelsbach*, Mario Waser and Christian Klampfl
Anal. Bioanal. Chem., 2014, 406, 3647-3656. [full text]

 

<2013>

27. "Towards Tartaric Acid-Derived Asymmetric Organocatalysts"
Katharina Gratzer, Guddeangadi N. Gururaja and Mario Waser*
Eur. J. Org. Chem, 2013, 4471-4482. [full text]

26. "Application Scope and Limitations of TADDOL-Derived Chiral Ammonium Salt Phase-Transfer Catalysts"
Guddeangadi N. Gururaja, Richard Herchl, Antonia Pichler, Katharina Gratzer, and Mario Waser*
Molecules, 2013, 18, 4357-4372. [full text]

25. "Asymmetric cyclopropanation of chalcones using chiral phase-transfer catalysts."
Richard Herchl and Mario Waser*
Tetrahedron Lett., 2013, 54, 2472-2475. [full text]

24. "Scope and limitations of diastereoselective aziridination reactions using stabilised ammonium ylides or α-bromo carbonyl nucleophiles."
Stefan Aichhorn, Guddeangadi N. Gururaja, Michael Reisinger and Mario Waser*
RSC Adv, 2013, 3, 4552-4557. [full text]

23. "Bifunctional Chiral Quaternary Ammonium Salt Catalysts – A Rapidly Emerging Class of Powerful Asymmetric Catalysts"
Johanna Novacek and Mario Waser*
Eur. J. Org. Chem, 2013, 637–648. [full text]

 

<2012>

22. "Investigations Concerning the Syntheses of TADDOL-Derived Secondary Amines and Their Use to Access Novel Chiral Organocatalysts"
Katharina Gratzer and Mario Waser*
Synthesis, 2012, 44, 3661-3670. [full text]

21. "Design, Synthesis, and Application of Tartaric Acid Derived N-Spiro Quaternary Ammonium Salts as Chiral Phase-Transfer Catalysts"
Mario Waser,* Katharina Gratzer, Richard Herchl, and Norbert Müller;
Org. Biomol. Chem., 2012, 10, 251-254. [full text]

20. "Photoreactive, water-soluble conjugates of hypericin with polyphosphazenes"
Ian Teasdale,* Mario Waser, Sandra Wilfert, Heinz Falk, Oliver Brüggemann;
Monatsh. Chem., 2012, 143, 355-360. [full text]

 

<2011>

19. "Process Development for a Key Synthetic Intermediate of LY2140023, a Clinical Candidate for the Treatment of Schizophrenia"
Mario Waser,* Eric D. Moher,* Sandy S. K. Borders, Marvin M. Hansen, David W. Hoard, Michael E. Laurila, Michael E. LeTourneau, Richard D. Miller, Michael L. Phillips, Kevin A. Sullivan, Jeffrey A. Ward, Chaoyu Xie, Cheryl A. Bye, Tanja Leitner, Brigitte Herzog-Krimbacher, Marcus Kordian, and Martin Müllner;
Org. Proc. Res. Dev., 2011, 15, 1266-1274. [full text]

18. "Identification of the Best-Suited Leaving Group for the Diastereoselective Synthesis of Glycidic Amides from Stabilised Ammonium Ylides and Aldehydes"
Richard Herchl, Martin Stiftinger, and Mario Waser;*
Org. Biomol. Chem., 2011, 9, 7023–7027. [full text]

17. "Progress in the Chemistry of Second Generation Hypericin Based Photosensitizers"
Mario Waser* and Heinz Falk;
Curr. Org. Chem., 2011, 15, 3894-3907.

16. "Molecular Editing and Assessment of the Cytotoxic Properties of Iejimalide and Progeny"
Julien Gagnepain, Emilie Moulin, Cristina Nevado, Mario Waser, Armin Maier, Gerhard Kelter, Heinz-Herbert Fiebig, and Alois Fürstner;*
Chem. Eur. J., 2011, 17, 6973–6984. [full text]

15. "Ammonium Ylides for the Diastereoselective Synthesis of Glycidic Amides"
Mario Waser,* Richard Herchl, and Norbert Müller;
Chem. Commun., 2011, 47, 2170-2172. [full text]

14. "Identification of Thymol Phase I Metabolites in Human Urine by Headspace Sorptive Extraction Combined with Thermal Desorption and Gas Chromatography Mass Spectrometry"
Bernhard Thalhamer,* Wolfgang Buchberger, and Mario Waser;
J. Pharm. Biomed. Anal., 2011, 56, 64–69.

 

<2005-2010>

13. "A Remarkable Cyclization of TADDOL-bisthioacetate under Oxidative Conditions"
Mario Waser,* Manuela Haunschmidt, and Markus Himmelsbach;
Monatsh. Chem., 2010, 141, 1347–1351.

12. "Development of a Scalable and Safe Process for the Production of 4-Chloro-2,3-Dimethylpyridine-N-oxide as a Key-Intermediate in the Syntheses of Proton Pump Inhibitors"
Mario Waser, Roland Obermüller, John Matthias Wiegand, Wolfgang Schiek, Hans Fierz, and Wolfgang Skranc;*
Org. Proc. Res. Dev., 2010, 14, 562-567.

11. "In Vitro Study of the Photocytotoxicity of Bathochromically Shifted Hypericin Derivatives"
Mieke Roelants, Bernd Lackner, Mario Waser, Heinz Falk, Patrizia Agostinis, Hendrik Van Poppel, and Peter A.M. de Witte;*
Photochem. Photobiol. Sci., 2009, 8, 822-829.

10. "A Versatile Protocol for Stille–Migita Cross Coupling Reactions"
Alois Fürstner,* Jacques-Alexis Funel, Martin Tremblay, Laure C. Bouchez, Cristina Nevado, Mario Waser, Jens Ackerstaff, and Christopher C. Stimson;
Chem. Commun., 2008, 2873-2875.

9. "Total Synthesis of Iejimalide A-D and Assessment of the Remarkable Actin-Depolymerizing Capacity of these Polyene Macrolides"
Alois Fürstner,* Cristina Nevado, Mario Waser, Martin Tremblay, Carine Chevrier, Filip Teplý, Christophe Aissa, Emilie Moulin, and Oliver Müller;
J. Am. Chem. Soc., 2007, 129, 9150-9161.

8. "Towards Second Generation Hypericin Based Photosensitizers for Photodynamic Therapy"
Mario Waser* and Heinz Falk;*
Curr. Org. Chem., 2007, 11, 547-558.

7. "Totalsynthesis of Iejimalide B"
Alois Fürstner,* Cristina Nevado, Martin Tremblay, Carine Chevrier, Filip Teplý, Christophe Aissa, and Mario Waser;
Angew. Chem. Int. Ed., 2006, 45, 5837-5842; Angew. Chem., 2006, 118, 5969-5974.

6. "Condensed Emodin Derivatives and Their Applicability for the Synthesis of a Fused Heterocyclic Hypericin Derivative"
Mario Waser* and Heinz Falk;*
Eur. J. Org. Chem., 2006, 1200-1206.

5. "9,12-Dibenzothiazolylhypericin and 10,11-Dibenzothiazolyl-10,11-didemethylhypericin: Photochemical Properties of Hypericin Derivatives Depending on the Substitution Site"
Mario Waser, Yulita Popova, Christian W. Klampfl, and Heinz Falk;*
Monatsh. Chem., 2005, 136, 1791–1797.

4. "Concerning Chemistry, Reactivity, and Mechanism of Transition Metal Catalysed Oxidation of Benzylic Compounds by Means of Ozone"
Mario Waser, Walther G. Jary, Peter Pöchlauer, and Heinz Falk;*
J. Mol. Catal. A-Chem., 2005, 236, 187-193.

3. "Syntheses, Photochemical Properties, and Tautomerism of Intramolecularly Friedel- Crafts Acylated Hypericin Derivatives"
Mario Waser, Yulita Popova, Christoph Etzlstorfer, Werner F. Huber, and Heinz Falk;*
Monatsh. Chem., 2005, 136, 1221–1231.

2. "An Efficient Regioselective Synthesis of Endocrocin and Structural Related Natural Anthraquinones Starting from Emodin"
Mario Waser, Bernd Lackner, Joachim Zuschrader, Norbert Müller, and Heinz Falk;*
Tetrahedron Lett., 2005, 46, 2377–2380.

1. "Intramolecularly Friedel-Crafts Acylated Emodin Derivatives. An Access to the Cores of Angucyclinones, Anthracyclinones, and to Hypericin Analogues"
Mario Waser and Heinz Falk;*
Monatsh. Chem., 2005, 136, 609–618.

Books / Patents / Talks

Contributions to Books and Bookchapters:

5. "Tyrosine Alkaloids"
Uwe Rinner and Mario Waser
in From Biosynthesis to Total Synthesis: Strategies and Tactics for Natural Products. A. Zografos (Ed.) 2016, Chapter 12, 431-472, Wiley, ISBN 978-1-118-75173-2.

4. "Monoterpenes and Iridoids"
Mario Waser and Uwe Rinner
in From Biosynthesis to Total Synthesis: Strategies and Tactics for Natural Products. A. Zografos (Ed.) 2016, Chapter 6, 196-235, Wiley, ISBN 978-1-118-75173-2.

3. "Cooperative Catalysis Involving Chiral Ion Pair Catalysts"
Mario Waser, Johanna Novacek, and Katharina Gratzer
in Cooperative Catalysis. R. Peters (Ed.) 2015, Chapter 7, 197-226, Wiley-VCH Weinheim, ISBN 978-3-527-33689-0.

2. “Asymmetric Phase–Transfer Catalysis as a Powerful Tool in the Synthesis of Biologically Active Chiral Complex Natural Products“
Guddeangadi N. Gururaja, Mario Waser
in Studies in Natural Product Chemistry. Atta-ur-Rahman (Ed.) 2014, 43, Chapter 14, 409-435, Elsevier.
      
1. "Asymmetric Organocatalysis in Natural Product Syntheses"
Mario Waser
Prog. Chem. Org. Nat. Prod., A. D. Kinghorn, H. Falk, J. Kobayashi (Eds), 2012, 96.
Springer, ISBN 978-3-7091-1162-8.
 

Patent Applications:

"Process for the manufacture of Isavuconazole or Ravuconazole"
Ruben van Summeren, Harrie Vaessen, Daniel Mink, and Mario Waser;
WO2014023623 A1.

"Iejimalid Analoga and Uses Thereof"
Alois Fürstner, Cristina Nevado-Blazquez, Mario Waser, Emilie Moulin, and Christophe Aissa;
WO2008/113320 A1.
 

Invited Talks and Oral Presentations:

"Design, Synthesis, and Applications of Chiral Quaternary Ammonium Salts"
18th Austrian Chemistry Days, Sept. 24, 2019, Linz, A.

"Syntheses of Chiral Heterocycles Using Ammonium Ylides"
27th ISHC, Sept. 03, 2019, Kyoto, Japan.

"Asymmetric Syntheses and Catalysis Employing Chiral Quaternary (Amm)-Onium Salts"
University of Nagasaki, August 30, 2019, Nagasaki, Japan.

"Asymmetric Syntheses Using Chiral Quaternary Ammonium Salts"
Université de Rouen Normandie, April 26, 2019, Rouen, F.

"Asymmetric Syntheses Using Chiral Quaternary Ammonium Salts"
University of Caen, April 24, 2019, Caen, F.

"Synthesis and Catalysis Using (Chiral) Quaternary Ammonium Salts"
University Graz, January 17, 2019, Graz, A.

"Chiral Quaternary Ammonium Salts as Catalysts or Auxiliaries for Asymmetric Syntheses"
10th Singapore International Chemistry Conference (SICC-10), December 18, 2018, Singapore.

"Chiral Quaternary Ammonium Salts for Asymmetric Transformations"
TU Graz, October 10, 2018, Graz, A.

"Bifunctional Ammonium Salt-Catalysed Asymmetric a-Fluorination of b-Ketoesters"
22nd International Symposium on Fluorine Chemistry, July 23, 2018, Oxford, UK.

"Asymmetric Syntheses with Quaternary Ammonium Salts"
Comenius University, April 13, 2018, Bratislava, SK.

"Quaternary Ammonium Salts in Asymmetric Syntheses"
Palacky University, March 23, 2018, Olomouc, CZ.

"Quaternary Ammonium Salts in Asymmetric Syntheses"
Masaryk University, March 22, 2018, Brno, CZ.

"Quaternary Ammonium Salts for Asymmetric Syntheses"
LICAT-JKU Meeting, February 22, 2018, Linz, A.

Chiral Bifunctional Phase-Transfer Catalysis – Catalyst Design and Applications
2nd International Conference on Catalysis and Chemical Engineering, February 19, 2018, Paris, F.

Quaternary Ammonium Salts for Asymmetric Syntheses
Servier, February 13, 2018, Budapest, H.

Chiral Quaternary Ammonium Salts for Asymmetric Syntheses
University of Ghent, October 18, 2017, Ghent, BE.

Design, Synthesis and Applications of Bifunctional Chiral Urea-Quaternary Ammonium Salt Catalysts
20th European Symposium on Organic Chemistry (ESOC 2017), July 4, 2017, Cologne, DE.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries for Asymmetric Transformations"
University of Strasbourg, February 9, 2017, Strasbourg, F.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries for Asymmetric Transformations"
University of Basel, February 8, 2017, Basel, CH.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries for Asymmetric Transformations"
University of Mulhouse, February 8, 2017, Mulhouse, F.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries for Asymmetric Transformations"
Organic Syntheses Symposium @ University of Zürich, February 7, 2017, Zürich, CH.

Design, Syntheses, and Applications of (Thio)-Urea/Quaternary Ammonium Salt Hybrid Catalysts"
21st International Conferenc on Organic Synthesis, December 12, 2016, Mumbai, India.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries in Asymmetric Reactions"
BHABHA Atomic Research Centre, December 9, 2016, Mumbai, India.

Quaternary Ammonium Salts as Powerful Catalysts and Auxiliaries for Asymmetric Reactions
University Innsbruck, November 17, 2016, Innsbruck, A.

Chiral Quaternary Ammonium Salts as Catalysts and Auxiliaries in Asymmetric Transformations
TU Vienna, April 28, 2016, Vienna, A.

Quaternary Ammonium Salts for Asymmetric Synthesis"
Anatolian Conference on Synthetic Organic Chemistry, March 23, 2016, Kusadasi, TR.

Chiral Quaternary Ammonium Salts in Asymmetric Synthesis
KickOff Meeting - Workgroup Organic Chemistry of the Austrian Chemical Society (GÖCH), March 1, 2016, Linz, A.

Quaternary Ammonium Salts: Powerful Catalysts and Auxiliaries in Asymmetric Reactions
LMU Munich, February 1, 2016, Munich, DE.

Design, Syntheses, and Applications of (Thio)-Urea/Quaternary Ammonium Salt Hybrid Catalysts

University of Oxford, November 26, 2015, Oxford, UK.

Quaternary Ammonium Salts: Powerful Catalysts and Auxiliaries in Asymmetric Reactions
University of Liverpool, November 25, 2015, Liverpool, UK.

Quaternary Ammonium Salts: Powerful Catalysts and Auxiliaries in Asymmetric Reactions
University of Bristol, November 23, 2015, Bristol, UK.

Quaternary Ammonium Salts: Powerful Catalysts and Auxiliaries in Asymmetric Reactions
University of Regensburg, November 18, 2015, Regensburg, DE.

Design and Application of New Tools for (Asymmetric) Catalysis
JKU Linz, June 29, 2015, Linz, A.

Asymmetric Syntheses of Epoxides and Aziridines using Ammonium Ylides
16th Blue Danube Symposium on Heterocyclic Chemistry, June 17, 2015, Balatonalmadi, H.

Quaternary Ammonium Salts: Powerful Catalysts and Auxiliaries in Asymmetric Reactions
University of Salerno, May 28, 2015, Salerno, I.

Design, Syntheses, and Applications of Chiral Quaternary Ammonium Salt Catalysts
University of Vienna, May 4, 2015, Vienna, A.

Quaternary Ammonium Salts: Powerful Asymmetric Catalysts and Auxiliaries for Stereoselective Reactions
DPx Fine Chemicals, Oct. 10, 2014, Linz, A.

Design, Synthesis and Applications of Bifunctional (Thio)-Urea Containing Chiral Ammonium Salt Catalysts
GDCH Chemiedozententagung, March 10-11, 2014, Paderborn, DE.

From the Development of Tartaric Acid Derived Organocatalysts Towards New Methods for Asymmetric Synthesis"
Université catholique de Louvain, Jan. 27, 2014, Louvain-la-Neuve, BE.

Bifunctional (Thio)-Urea Containing Chiral Ammonium Salt Catalysts
Syngenta Crop Protection, Jan. 13, 2014, Stein, CH.

From the Development of Tartaric Acid-Derived Organocatalysts Towards New Stereoselective Methods
Austrian Chemistry Days, Sept. 23-25, 2013, Graz, AT.

"Syntheses of Epoxides and Aziridines Using Ammonium Ylides
The 24th International Society of Heterocyclic Chemistry Congress, September 8-13, 2013, Shanghai, China.

From the Development of Tartaric Acid-Derived Organocatalysts Towards New Synthetic Methodologies
GDCH Chemiedozententagung, March 11-13, 2013, Berlin, DE.

"Design, Syntheses and Applications of TADDOL-Derived Asymmetric Phase-Transfer Catalysts
4th EuCheMS Chemistry Congress, August 26-30, 2012, Prague, CZ.

Design, Syntheses, and Applications of TADDOL-Derived Asymmetric Phase-Transfer Catalysts
Poster Chalk-Talk - Gordon Research Conference on Stereochemistry, July 29 - Aug 3, 2012, Newport, USA.

“Tartaric Acid Derived Organocatalysts
14th Austrian Chemistry Days, Sept. 26-29, 2011, Linz, Austria; OP-11.

Synthesis of TADDOL-derived N-spiro Quaternary Ammonium Salts and Applications in Asymmetric Phase-Transfer Catalysis
Gregynog Synthesis Workshop, Sept. 23-25, 2011, Newtown, UK.

Towards Tartaric Acid Derived Quaternary Ammonium Salts for Asymmetric Phase Transfer Catalysis
17th European Symposium on Organic Chemistry (ESOC 2011), July 10-15, 2011, Crete, Greece; OC-25.

Towards Tartaric Acid Derived Organocatalysts
3rd Young Investigator's Workshop of the EuCheMS Organic Division, July 8-9, 2011, Heraklion, Greece.

TADDOL Derived Quaternary Ammonium Salts: Syntheses and Applications in Asymmetric Catalysis
XXIII Conference on Advances in Organic Synthesis (CAOS 2011), June 26-30, 2011, Hradec Kralove, Czech Republic.

Totalsyntheses of the Iejimalides
IKCOC-10, Nov. 13-17, 2006, Kyoto, Japan.

Towards Second Generation Hypericin Based Photosensitizers
10th World Congress of the International Photodynamic Association, June 22-25, 2005, Munich, Germany.