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Wartmann C, Nandi S, Neudörfl JM, Berkessel A. Titanium Salalen Catalyzed Enantioselective Benzylic Hydroxylation. Angew Chem Int Ed Engl 2023; 62:e202306584. [PMID: 37366111 DOI: 10.1002/anie.202306584] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/22/2023] [Accepted: 06/23/2023] [Indexed: 06/28/2023]
Abstract
The titanium complex of the cis-1,2-diaminocyclohexane (cis-DACH) derived Berkessel-salalen ligand is a highly efficient and enantioselective catalyst for the asymmetric epoxidation of terminal olefins with hydrogen peroxide ("Berkessel-Katsuki catalyst"). We herein report that this epoxidation catalyst also effects the highly enantioselective hydroxylation of benzylic C-H bonds with hydrogen peroxide. Mechanism-based ligand optimization identified a novel nitro-salalen Ti-catalyst of the highest efficiency ever reported for asymmetric catalytic benzylic hydroxylation, with enantioselectivities of up to 98 % ee, while overoxidation to ketone is marginal. The novel nitro-salalen Ti-catalyst also shows enhanced epoxidation efficiency, as evidenced by e.g. the conversion of 1-decene to its epoxide in 90 % yield with 94 % ee, at a catalyst loading of 0.1 mol-% only.
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Affiliation(s)
- Christina Wartmann
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, 50939, Cologne, Germany
| | - Shiny Nandi
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, 50939, Cologne, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, 50939, Cologne, Germany
| | - Albrecht Berkessel
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, 50939, Cologne, Germany
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2
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Paul M, Thomulka T, Harnying W, Neudörfl JM, Adams CR, Martens J, Berden G, Oomens J, Meijer AJHM, Berkessel A, Schäfer M. Hydrogen Bonding Shuts Down Tunneling in Hydroxycarbenes: A Gas-Phase Study by Tandem-Mass Spectrometry, Infrared Ion Spectroscopy, and Theory. J Am Chem Soc 2023. [PMID: 37235775 DOI: 10.1021/jacs.3c01698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Hydroxycarbenes can be generated and structurally characterized in the gas phase by collision-induced decarboxylation of α-keto carboxylic acids, followed by infrared ion spectroscopy. Using this approach, we have shown earlier that quantum-mechanical hydrogen tunneling (QMHT) accounts for the isomerization of a charge-tagged phenylhydroxycarbene to the corresponding aldehyde in the gas phase and above room temperature. Herein, we report the results of our current study on aliphatic trialkylammonio-tagged systems. Quite unexpectedly, the flexible 3-(trimethylammonio)propylhydroxycarbene turned out to be stable─no H-shift to either aldehyde or enol occurred. As supported by density functional theory calculations, this novel QMHT inhibition is due to intramolecular H-bonding of a mildly acidic α-ammonio C-H bonds to the hydroxyl carbene's C-atom (C:···H-C). To further support this hypothesis, (4-quinuclidinyl)hydroxycarbenes were synthesized, whose rigid structure prevents this intramolecular H-bonding. The latter hydroxycarbenes underwent "regular" QMHT to the aldehyde at rates comparable to, e.g., methylhydroxycarbene studied by Schreiner et al. While QMHT has been shown for a number of biological H-shift processes, its inhibition by H-bonding disclosed here may serve for the stabilization of highly reactive intermediates such as carbenes, even as a mechanism for biasing intrinsic selectivity patterns.
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Affiliation(s)
- Mathias Paul
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
| | - Thomas Thomulka
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
| | - Wacharee Harnying
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
| | - Charlie R Adams
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
| | - Jonathan Martens
- Institute for Molecules and Materials, FELIX Laboratory, Radboud University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
| | - Giel Berden
- Institute for Molecules and Materials, FELIX Laboratory, Radboud University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
| | - Jos Oomens
- Institute for Molecules and Materials, FELIX Laboratory, Radboud University, Toernooiveld 7, Nijmegen 6525 ED, The Netherlands
- Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, Amsterdam 1098 XH, The Netherlands
| | | | - Albrecht Berkessel
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
| | - Mathias Schäfer
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstraße 4, Cologne 50939, Germany
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3
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Klein MT, Krause BM, Neudörfl JM, Kühne R, Schmalz HG. Design and synthesis of a tetracyclic tripeptide mimetic frozen in a polyproline type II (PP2) helix conformation. Org Biomol Chem 2022; 20:9368-9377. [PMID: 36385673 DOI: 10.1039/d2ob01857h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A synthesis of the new tetracyclic scaffold ProM-19, which represents a XPP tripeptide unit frozen in a PPII helix conformation, was developed. As a key building block, N-Boc-protected ethyl (1S,3S,4R)-2-azabicyclo[2.2.1]hept-5-ene-2-carboxylate was prepared through a diastereoselective aza-Diels-Alder reaction and subsequent hydrogenolytic removal of the chiral N-1-phenylethyl substituent under temporary protection of the double bond through dihydroxylation and reconstitution by Corey-Winter olefination. The target compound Boc-[ProM-19]-OMe was then prepared via subsequent peptide coupling and Ru-catalyzed ring-closing metathesis steps employing (S)-N-Boc-allylgylcine and cis-5-vinyl-proline methyl ester as additional building blocks. In addition, Ac-[2-Cl-Phe]-[Pro]-[ProM-19]-OMe was prepared by solution phase peptide synthesis as a potential ligand for the ena-VASP EVH1 domain.
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Affiliation(s)
- Marco T Klein
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939 Köln, Germany.
| | - Bernhard M Krause
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939 Köln, Germany.
| | - Jörg-Martin Neudörfl
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939 Köln, Germany.
| | - Ronald Kühne
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Hans-Günther Schmalz
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939 Köln, Germany.
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Schlundt née Göderz A, Hemmersbach L, Romanski S, Neudörfl JM, Schmalz HG. Vinylogous Winstein Rearrangement: Unexpected Isomerization of an Azide-Substituted Cyclohexadiene–Fe(CO) 3 Complex. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Lars Hemmersbach
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Steffen Romanski
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
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5
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Abodo Onambele L, Hoffmann N, Kater L, Hemmersbach L, Neudörfl JM, Sitnikov N, Kater B, Frias C, Schmalz HG, Prokop A. An organometallic analogue of combretastatin A-4 and its apoptosis-inducing effects on lymphoma, leukemia and other tumor cells in vitro. RSC Med Chem 2022; 13:1044-1051. [PMID: 36320328 PMCID: PMC9491352 DOI: 10.1039/d2md00144f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/28/2022] [Indexed: 09/19/2023] Open
Abstract
Hexacarbonyl[1,3-dimethoxy-5-((4'-methoxyphenyl)ethynyl)benzene]dicobalt (NAHO27), an organometallic analogue of combretastatin A-4, has been synthesized and its activity against lymphoma, leukemia, breast cancer and melanoma cells has been investigated. It was shown that NAHO27 specifically induces apoptosis in BJAB lymphoma and Nalm-6 leukemia cells at low micromolar concentration and does not affect normal leukocytes in vitro. It also proved to be active against vincristine and daunorubicin resistant leukemia cell lines with p-glycoprotein-caused multidrug resistance and showed a pronounced (550%) synergistic effect when co-applied with vincristine at very low concentrations. Mechanistic investigations revealed NAHO27 to induce apoptosis via the mitochondrial (intrinsic) pathway as reflected by the processing of caspases 3 and 9, the involvement of Bcl-2 and smac/DIABLO, and the reduction of mitochondrial membrane potential. Gene expression analysis and protein expression analysis via western blot showed an upregulation of the proapoptotic protein harakiri by 9%.
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Affiliation(s)
- Liliane Abodo Onambele
- Department of Pediatric Oncology/Hematology, Children's Hospital of the City of Cologne Amsterdamer Str. 59 50735 Cologne Germany
- Department of Pediatric Oncology/Hematology, University Medical Center Charité Campus Virchow, Augustenburger Pl. 1 13353 Berlin Germany
| | - Natalie Hoffmann
- Department of Chemistry, University of Cologne Greinstrasse 4 50939 Cologne Germany
| | - Lisa Kater
- Department of Pediatric Oncology/Hematology, University Medical Center Charité Campus Virchow, Augustenburger Pl. 1 13353 Berlin Germany
| | - Lars Hemmersbach
- Department of Chemistry, University of Cologne Greinstrasse 4 50939 Cologne Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne Greinstrasse 4 50939 Cologne Germany
| | - Nikolay Sitnikov
- Department of Chemistry, University of Cologne Greinstrasse 4 50939 Cologne Germany
| | - Benjamin Kater
- Department of Pediatric Oncology/Hematology, University Medical Center Charité Campus Virchow, Augustenburger Pl. 1 13353 Berlin Germany
| | - Corazon Frias
- Department of Pediatric Oncology/Hematology, University Medical Center Charité Campus Virchow, Augustenburger Pl. 1 13353 Berlin Germany
- Department of Pediatric Hematology/Oncology, Helios Clinic Schwerin 19055 Schwerin Germany
- MSH Medical School Hamburg Am Kaiserkai 1 20457 Hamburg Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne Greinstrasse 4 50939 Cologne Germany
| | - Aram Prokop
- Department of Pediatric Oncology/Hematology, Children's Hospital of the City of Cologne Amsterdamer Str. 59 50735 Cologne Germany
- Department of Pediatric Oncology/Hematology, University Medical Center Charité Campus Virchow, Augustenburger Pl. 1 13353 Berlin Germany
- Department of Pediatric Hematology/Oncology, Helios Clinic Schwerin 19055 Schwerin Germany
- MSH Medical School Hamburg Am Kaiserkai 1 20457 Hamburg Germany
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Reimche I, Yu H, Ariantari NP, Liu Z, Merkens K, Rotfuß S, Peter K, Jungwirth U, Bauer N, Kiefer F, Neudörfl JM, Schmalz HG, Proksch P, Teusch N. Phenanthroindolizidine Alkaloids Isolated from Tylophora ovata as Potent Inhibitors of Inflammation, Spheroid Growth, and Invasion of Triple-Negative Breast Cancer. Int J Mol Sci 2022; 23:ijms231810319. [PMID: 36142230 PMCID: PMC9499467 DOI: 10.3390/ijms231810319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/01/2022] [Accepted: 09/02/2022] [Indexed: 11/16/2022] Open
Abstract
Triple-negative breast cancer (TNBC), representing the most aggressive form of breast cancer with currently no targeted therapy available, is characterized by an inflammatory and hypoxic tumor microenvironment. To date, a broad spectrum of anti-tumor activities has been reported for phenanthroindolizidine alkaloids (PAs), however, their mode of action in TNBC remains elusive. Thus, we investigated six naturally occurring PAs extracted from the plant Tylophora ovata: O-methyltylophorinidine (1) and its five derivatives tylophorinidine (2), tylophoridicine E (3), 2-demethoxytylophorine (4), tylophoridicine D (5), and anhydrodehydrotylophorinidine (6). In comparison to natural (1) and for more-in depth studies, we also utilized a sample of synthetic O-methyltylophorinidine (1s). Our results indicate a remarkably effective blockade of nuclear factor kappa B (NFκB) within 2 h for compounds (1) and (1s) (IC50 = 17.1 ± 2.0 nM and 3.3 ± 0.2 nM) that is different from its effect on cell viability within 24 h (IC50 = 13.6 ± 0.4 nM and 4.2 ± 1 nM). Furthermore, NFκB inhibition data for the additional five analogues indicate a structure–activity relationship (SAR). Mechanistically, NFκB is significantly blocked through the stabilization of its inhibitor protein kappa B alpha (IκBα) under normoxic as well as hypoxic conditions. To better mimic the TNBC microenvironment in vitro, we established a 3D co-culture by combining the human TNBC cell line MDA-MB-231 with primary murine cancer-associated fibroblasts (CAF) and type I collagen. Compound (1) demonstrates superiority against the therapeutic gold standard paclitaxel by diminishing spheroid growth by 40% at 100 nM. The anti-proliferative effect of (1s) is distinct from paclitaxel in that it arrests the cell cycle at the G0/G1 state, thereby mediating a time-dependent delay in cell cycle progression. Furthermore, (1s) inhibited invasion of TNBC monoculture spheroids into a matrigel®-based environment at 10 nM. In conclusion, PAs serve as promising agents with presumably multiple target sites to combat inflammatory and hypoxia-driven cancer, such as TNBC, with a different mode of action than the currently applied chemotherapeutic drugs.
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Affiliation(s)
- Irene Reimche
- Department of Biomedical Sciences, Institute of Health Research and Education, University of Osnabrück, 49090 Osnabrück, Germany
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Haiqian Yu
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Ni Putu Ariantari
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
- Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Udayana University, Bali 80361, Indonesia
| | - Zhen Liu
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Kay Merkens
- Department of Chemistry, University of Cologne, 50923 Cologne, Germany
| | - Stella Rotfuß
- Department of Biomedical Sciences, Institute of Health Research and Education, University of Osnabrück, 49090 Osnabrück, Germany
| | - Karin Peter
- Department of Biomedical Sciences, Institute of Health Research and Education, University of Osnabrück, 49090 Osnabrück, Germany
| | - Ute Jungwirth
- Department of Life Sciences, Centre for Therapeutic Innovation, University of Bath, Bath BA2 7AY, UK
| | - Nadine Bauer
- European Institute of Molecular Imaging, University of Münster, 48149 Münster, Germany
| | - Friedemann Kiefer
- European Institute of Molecular Imaging, University of Münster, 48149 Münster, Germany
- Max Planck Institute for Molecular Biomedicine, 48149 Münster, Germany
| | | | | | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
| | - Nicole Teusch
- Department of Biomedical Sciences, Institute of Health Research and Education, University of Osnabrück, 49090 Osnabrück, Germany
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University, 40225 Düsseldorf, Germany
- Correspondence: ; Tel.: +49-211-81-14163
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7
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Engelhardt PM, Rueda SF, Drexelius M, Neudörfl JM, Lauster D, Hackenberger CPR, Kühne R, Neundorf I, Schmalz HG. Synthetic α-Helical Peptides as Potential Inhibitors of the ACE2 SARS-CoV-2 Interaction. Chembiochem 2022; 23:e202200372. [PMID: 35785462 PMCID: PMC9350387 DOI: 10.1002/cbic.202200372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 07/04/2022] [Indexed: 11/11/2022]
Abstract
During viral cell entry, the spike protein of SARS‐CoV‐2 binds to the α1‐helix motif of human angiotensin‐converting enzyme 2 (ACE2). Thus, alpha‐helical peptides mimicking this motif may serve as inhibitors of viral cell entry. For this purpose, we employed the rigidified diproline‐derived module ProM‐5 to induce α‐helicity in short peptide sequences inspired by the ACE2 α1‐helix. Starting with Ac‐QAKTFLDKFNHEAEDLFYQ‐NH2 as a relevant section of α1, a series of peptides, N‐capped with either Ac‐βHAsp‐[ProM‐5] or Ac‐βHAsp‐PP, were prepared and their α‐helicities were investigated. While ProM‐5 clearly showed a pronounced effect, an even increased degree of helicity (up to 63 %) was observed in sequences in which non‐binding amino acids were replaced by alanine. The binding affinities of the peptides towards the spike protein, as determined by means of microscale thermophoresis (MST), revealed only a subtle influence of the α‐helical content and, noteworthy, led to the identification of an Ac‐βHAsp‐PP‐capped peptide displaying a very strong binding affinity (KD=62 nM).
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Affiliation(s)
| | - Sebastián Florez Rueda
- FMP: Leibniz-Forschungsinstitut fur Molekulare Pharmakologie im Forschungsverbund Berlin eV, chemical biology, GERMANY
| | - Marco Drexelius
- University of Cologne: Universitat zu Koln, Chemistry, GERMANY
| | | | - Daniel Lauster
- Freie Universitat Berlin Fachbereich Biologie Chemie Pharmazie, biochemistry and chemistry, GERMANY
| | - Christian P R Hackenberger
- FMP: Leibniz-Forschungsinstitut fur Molekulare Pharmakologie im Forschungsverbund Berlin eV, chemical biology, GERMANY
| | - Ronald Kühne
- FMP: Leibniz-Forschungsinstitut fur Molekulare Pharmakologie im Forschungsverbund Berlin eV, drug discovery, GERMANY
| | - Ines Neundorf
- University of Cologne: Universitat zu Koln, chemistry and biochemistry, GERMANY
| | - Hans-Günther Schmalz
- Universitat zu Koln, Department für Chemie, Greinstrasse 4, 50939, Köln, GERMANY
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8
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Schumacher CE, Rausch M, Greven T, Neudörfl JM, Schneider T, Schmalz HG. Total Synthesis and Antibiotic Properties of Amino‐Functionalized Aromatic Terpenoids Related to Erogorgiaene and the Pseudopterosins. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Marvin Rausch
- University of Bonn: Rheinische Friedrich-Wilhelms-Universitat Bonn Pharmaceutical Microbiology GERMANY
| | - Tobias Greven
- University of Cologne: Universitat zu Koln Chemistry GERMANY
| | | | - Tanja Schneider
- University of Bonn: Rheinische Friedrich-Wilhelms-Universitat Bonn Pharmaceutical Biology GERMANY
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9
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Stein A, Hilken née Thomopoulou P, Frias C, Hopff SM, Varela P, Wilke N, Mariappan A, Neudörfl JM, Fedorov AY, Gopalakrishnan J, Gigant B, Prokop A, Schmalz HG. B-nor-methylene Colchicinoid PT-100 Selectively Induces Apoptosis in Multidrug-Resistant Human Cancer Cells via an Intrinsic Pathway in a Caspase-Independent Manner. ACS Omega 2022; 7:2591-2603. [PMID: 35097257 PMCID: PMC8792921 DOI: 10.1021/acsomega.1c04659] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 12/31/2021] [Indexed: 05/14/2023]
Abstract
Colchicine, the main active alkaloid from Colchicum autumnale L., is a potent tubulin binder and represents an interesting lead structure for the development of potential anticancer chemotherapeutics. We report on the synthesis and investigation of potentially reactive colchicinoids and their surprising biological activities. In particular, the previously undescribed colchicinoid PT-100, a B-ring contracted 6-exo-methylene colchicinoid, exhibits extraordinarily high antiproliferative and apoptosis-inducing effects on various types of cancer cell lines like acute lymphoblastic leukemia (Nalm6), acute myeloid leukemia (HL-60), Burkitt-like lymphoma (BJAB), human melanoma (MelHO), and human breast adenocarcinoma (MCF7) cells at low nanomolar concentrations. Apoptosis induction proved to be especially high in multidrug-resistant Nalm6-derived cancer cell lines, while healthy human leukocytes and hepatocytes were not affected by the concentration range studied. Furthermore, caspase-independent initiation of apoptosis via an intrinsic pathway was observed. PT-100 also shows strong synergistic effects in combination with vincristine on BJAB and Nalm6 cells. Cocrystallization of PT-100 with tubulin dimers revealed its (noncovalent) binding to the colchicine-binding site of β-tubulin at the interface to the α-subunit. A pronounced effect of PT-100 on the cytoskeleton morphology was shown by fluorescence microscopy. While the reactivity of PT-100 as a weak Michael acceptor toward thiols was chemically proven, it remains unclear whether this contributes to the remarkable biological properties of this unusual colchicinoid.
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Affiliation(s)
- Andreas Stein
- Department
of Chemistry, University of Cologne, 50939 Cologne, Germany
| | | | - Corazon Frias
- Department
of Paediatric Oncology, Children’s
Hospital Cologne, 50735 Cologne, Germany
| | - Sina M. Hopff
- Department
of Paediatric Oncology, Children’s
Hospital Cologne, 50735 Cologne, Germany
| | - Paloma Varela
- Université
Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the
Cell (I2BC), 91198 Gif-sur-Yvette cedex, France
| | - Nicola Wilke
- Department
of Paediatric Oncology, Children’s
Hospital Cologne, 50735 Cologne, Germany
| | - Arul Mariappan
- Laboratory
for Centrosome and Cytoskeleton Biology, Institute of Human Genetics, Heinrich-Heine-University, 40225 Düsseldorf, Germany
| | | | - Alexey Yu Fedorov
- Department
of Organic Chemistry, N.I. Lobachevsky State
University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russian
Federation
| | - Jay Gopalakrishnan
- Laboratory
for Centrosome and Cytoskeleton Biology, Institute of Human Genetics, Heinrich-Heine-University, 40225 Düsseldorf, Germany
| | - Benoît Gigant
- Université
Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the
Cell (I2BC), 91198 Gif-sur-Yvette cedex, France
| | - Aram Prokop
- Department
of Paediatric Oncology, Children’s
Hospital Cologne, 50735 Cologne, Germany
- Department
of Pediatric Hematology/Oncology, Helios
Clinic Schwerin, 19055 Schwerin, Germany
- MSH
Medical School Hamburg, Am Kaiserkai 1, 20457 Hamburg, Germany
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10
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Lefarth J, Haseloer A, Kletsch L, Klein A, Neudörfl JM, Griesbeck A. From energy transfer to electron transfer photocatalysis (PenT→PET): oxidative cyclobutane cleavage alters the product composition. Chem Commun (Camb) 2022; 58:12999-13002. [DOI: 10.1039/d2cc04693h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Photocatalytic [2+2]-cycloadditions between cyclic enones and electron-rich cyclic enol ethers are initiated by triplet-triplet energy transfer from an excited iridium photocatalyst to the enone acceptor. The composition of the resulting...
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11
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Krause BM, Bauer B, Neudörfl JM, Wieder T, Schmalz HG. ItaCORMs: conjugation with a CO-releasing unit greatly enhances the anti-inflammatory activity of itaconates. RSC Med Chem 2021; 12:2053-2059. [PMID: 35024614 PMCID: PMC8672850 DOI: 10.1039/d1md00163a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Accepted: 10/11/2021] [Indexed: 12/22/2022] Open
Abstract
Endogenous itaconate as well as the gasotransmitter CO have recently been described as powerful anti-inflammatory and immunomodulating agents. However, each of the two agents comes along with a major drawback: Whereas itaconates only exert beneficial effects at high concentrations above 100 μM, the uncontrolled application of CO has strong toxic effects. To solve these problems, we designed hybrid prodrugs, i.e. itaconates that are conjugated with an esterase-triggered CO-releasing acyloxycyclohexadiene-Fe(CO)3 unit (ItaCORMs). Here, we describe the synthesis of different ItaCORMs and demonstrate their anti-inflammatory potency in cellular assays of primary murine immune cells in the low μmolar range (<10 μM). Thus, ItaCORMs represent a promising new class of hybrid compounds with high clinical potential as anti-inflammatory agents.
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Affiliation(s)
- Bernhard M Krause
- University of Cologne, Department of Chemistry Greinstr. 4 5939 Köln Germany
| | - Britta Bauer
- University Medical Center Tübingen, Department of Dermatology Liebermeisterstr. 25 72076 Tübingen Germany
| | | | - Thomas Wieder
- University Medical Center Tübingen, Department of Dermatology Liebermeisterstr. 25 72076 Tübingen Germany.,Physiologisches Institut, Abteilung für Vegetative und Klinische Physiologie, Eberhard-Karls-Universität Tübingen Wilhelmstr. 56 72074 Tübingen Germany
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12
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Hemmersbach L, Romanski S, Botov S, Adler A, Neudörfl JM, Schmalz HG. On the Diastereoselectivity of the Complexation of Ketopinic Acid-Derived 2-Acyloxy-1,3-cyclohexadienes and the Configurational Stability of Dienol-Fe(CO) 3 Complexes. A Case Study. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00354] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lars Hemmersbach
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Steffen Romanski
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Svetlana Botov
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Andreas Adler
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
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13
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Schmalz HG, Albat D, Neudörfl JM. A Short Enantioselective Synthesis of (S)-Levetiracetam through Direct Palladium-Catalyzed Asymmetric N-Allylation of Methyl 4-Aminobutyrate. Synlett 2021. [DOI: 10.1055/a-1493-9078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractAn exceedingly short and enantioselective synthesis of the antiepileptic drug (S)-levetiracetam was elaborated. As the chirogenic key step, a Pd-catalyzed asymmetric N-allylation of methyl 4-aminobutyrate was achieved in the presence of only 1 mol% of a catalyst prepared in situ from [Pd(allyl)Cl]2 and a tartaric acid-derived C
2-symmetric diphosphine ligand.
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14
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Schmalz HG, Taspinar Ö, Stojadinovic VK, Neudörfl JM. A Concise Synthesis of 24,25-Dihydro-6-epi-Monanchosterol A. Synlett 2021. [DOI: 10.1055/a-1480-5225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractWe report the first synthetic entry to a steroid with an unusual bicyclo[4.3.1]dec-3-en-10-one A/B ring substructure as a close structural analogue of the anti-inflammatory monanchosterols. Under optimized conditions, regioselective cis-dihydroxylation of the Δ5-double bond of 7-dehydrocholesterol and subsequent Criegee oxidation yields the corresponding 5,6-seco-steroid as a pure Z-isomer which upon treatment with K2CO3 in MeOH diastereoselectively affords 24,25-dihydro-6-epi-monanchosterol A through intramolecular aldol addition (cyclization). The developed three-step sequence proceeds in 17% overall yield without the need of any protecting group. The title compound was characterized by X-ray crystallography.
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15
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Abstract
We report the first chemical synthesis of eurysterol A, a cytotoxic and antifungal marine steroidal sulfate with a unique C8−C19 oxy‐bridged cholestane skeleton. After C19 hydroxylation of cholesteryl acetate, used as an inexpensive commercial starting material, the challenging oxidative functionalization of ring B was achieved by two different routes to set up a 5α‐hydroxy‐7‐en‐6‐one moiety. As a key step, an intramolecular oxa‐Michael addition was exploited to close the oxy‐bridge (8β,19‐epoxy unit). DFT calculations show this reversible transformation being exergonic by about −30 kJ mol−1. Along the optimized (scalable) synthetic sequence, the target natural product was obtained in only 11 steps in 5 % overall yield. In addition, an access to (isomeric) 7β,19‐epoxy steroids with a previously unknown pentacyclic ring system was discovered.
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Affiliation(s)
- Ömer Taspinar
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
| | - Tobias Wilczek
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
| | - Julian Erver
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
| | - Martin Breugst
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstraße 4, 50939, Köln, Germany
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16
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Dato FM, Neudörfl JM, Gütschow M, Goldfuss B, Pietsch M. ω-Quinazolinonylalkyl aryl ureas as reversible inhibitors of monoacylglycerol lipase. Bioorg Chem 2019; 94:103352. [PMID: 31668797 DOI: 10.1016/j.bioorg.2019.103352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 10/02/2019] [Accepted: 10/09/2019] [Indexed: 02/07/2023]
Abstract
The serine hydrolase monoacylglycerol lipase (MAGL) is involved in a plethora of pathological conditions, in particular pain and inflammation, various types of cancer, metabolic, neurological and cardiovascular disorders, and is therefore a promising target for drug development. Although a large number of irreversible-acting MAGL inhibitors have been discovered over the past years, there are only few compounds known so far which inhibit the enzyme in a reversible manner. Therefore, much effort is put into the development of novel chemical entities showing reversible inhibitory behavior, which is thought to cause less undesired side effects. To explore a wide range of chemical structures as MAGL binders, we have applied a virtual screening approach by docking small molecules into the crystal structure of human MAGL (hMAGL) and envisaged a library of 45 selected compounds which were then synthesized. Biochemical investigations included the determination of the inhibitory potency on hMAGL and two related hydrolases, i.e. human fatty acid amide hydrolase (hFAAH) and murine cholesterol esterase (mCEase). The most promising candidates from theses analyses, i.e. three ω-quinazolinonylalkyl aryl ureas bearing alkyl spacers of three to five methylene groups, exhibited IC50 values of 20-41 µM and reversible, detergent-insensitive behavior towards hMAGL. Among these compounds, the inhibitor 1-(3,5-bis(trifluoromethyl)phenyl)-3-(4-(4-oxo-3,4-dihydroquinazolin-2-yl)butyl)urea (96) was selected for further kinetic characterization, yielding a dissociation constant Ki = 15.4 µM and a mixed-type inhibition with a pronounced competitive component (α = 8.94). This mode of inhibition was further supported by a docking experiment, which suggested that the inhibitor occupies the substrate binding pocket of hMAGL.
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Affiliation(s)
- Florian M Dato
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931 Cologne, Germany; Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Cologne, Germany
| | - Jörg-Martin Neudörfl
- Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Cologne, Germany
| | - Michael Gütschow
- Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, An der Immenburg 4, 53121 Bonn, Germany
| | - Bernd Goldfuss
- Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Cologne, Germany.
| | - Markus Pietsch
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931 Cologne, Germany.
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17
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Ratsch F, Schlundt W, Albat D, Zimmer A, Neudörfl JM, Netscher T, Schmalz HG. Total Synthesis of α-Tocopherol through Enantioselective Iridium-Catalyzed Fragmentation of a Spiro-Cyclobutanol Intermediate. Chemistry 2019; 25:4941-4945. [PMID: 30741456 DOI: 10.1002/chem.201900564] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 11/10/2022]
Abstract
A conceptionally new strategy for the asymmetric (2R-selective) synthesis of α-tocopherol (vitamin E) was developed. In the stereocontrolled key step, a prochiral spiro[chromane-2,3'-cyclobutanol] unit is effectively desymmetrized under C-C bond activation in an unprecedented iridium-catalyzed transformation using (S)-DTBM-SegPhos as a chiral ligand (e.r. 97:3). To complete the synthesis, the side chain was attached through Ru-catalyzed cross-metathesis employing an alkene derived from (R,R)-hexahydrofarnesol. To suppress epimerization during the final hydrogenation, PtO2 had to be used as a catalyst instead of Pd/C. In an alternative approach (employing a propargyl-substituted spiro-cyclobutanol), the side chain was constructed prior to the Ir-catalyzed ring fragmentation (>99:1 d.r.) through enyne cross-metathesis (using an alkene derived from (R)-dihydrocitronellal) followed by Cr-catalyzed 1,4-hydrogenation and (diastereoselective) Pfaltz hydrogenation of the resulting triple-substituted olefin. The work demonstrates the potential of iridium catalysis for enantioselective C-C bond activation.
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Affiliation(s)
- Friederike Ratsch
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Waldemar Schlundt
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Dominik Albat
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Anne Zimmer
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
| | - Thomas Netscher
- Research and Development, DSM Nutritional Products, P.O. Box 2676, CH-4002, Basel, Switzerland
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Koeln, Germany
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18
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Abstract
A conceptually novel and stereoselective synthesis of the enantiopure octahydroindole building block and its conversion into the ACE inhibitor trandolapril was achieved. Key steps include the α-allylation of a protected l-pyroglutamic acid derivative, a highly diastereoselective Hosomi–Sakurai reaction and a Ru-catalyzed ring-closing metathesis of a 4,5-diallylated proline. This way, the synthesis of trandolapril was efficiently achieved in 25% overall yield (12 steps).
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19
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Affiliation(s)
- Vanessa Grote
- Department of Chemistry, University of Cologne, Greinstrasse 4−6, 50939 Cologne, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4−6, 50939 Cologne, Germany
| | - Bernd Goldfuss
- Department of Chemistry, University of Cologne, Greinstrasse 4−6, 50939 Cologne, Germany
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20
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Paul M, Detmar E, Schlangen M, Breugst M, Neudörfl JM, Schwarz H, Berkessel A, Schäfer M. Intermediates of N-Heterocyclic Carbene (NHC) Dimerization Probed in the Gas Phase by Ion Mobility Mass Spectrometry: C-H⋅⋅⋅:C Hydrogen Bonding Versus Covalent Dimer Formation. Chemistry 2019; 25:2511-2518. [PMID: 30488654 DOI: 10.1002/chem.201803641] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 11/27/2018] [Indexed: 11/06/2022]
Abstract
N-Heterocyclic carbenes (NHCs, :C) can interact with azolium salts (C-H+ ) by either forming a hydrogen-bonded aggregate (CHC+ ) or a covalent C-C bond (CCH+ ). In this study, the intramolecular NHC-azolium salt interactions of aromatic imidazolin-2-ylidenes and saturated imidazolidin-2-ylidenes have been investigated in the gas phase by traveling wave ion mobility mass spectrometry (TW IMS) and DFT calculations. The TW IMS experiments provided evidence for the formation of these important intermediates in the gas phase, and they identified the predominant aggregation mode (hydrogen bond vs. covalent C-C) as a function of the nature of the interacting carbene-azolium pairs.
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Affiliation(s)
- Mathias Paul
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Eric Detmar
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Maria Schlangen
- Institute of Chemistry, Technical University Berlin, Straße des 17. Juni 115, 10623, Berlin, Germany
| | - Martin Breugst
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Helmut Schwarz
- Institute of Chemistry, Technical University Berlin, Straße des 17. Juni 115, 10623, Berlin, Germany
| | - Albrecht Berkessel
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Mathias Schäfer
- Department of Chemistry, Organic Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
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21
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Brüllingen E, Neudörfl JM, Goldfuss B. Enantioselective Cu-catalyzed 1,4-additions of organozinc and Grignard reagents to enones: exceptional performance of the hydrido-phosphite-ligand BIFOP-H. NEW J CHEM 2019. [DOI: 10.1039/c8nj05886e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Enantioselective CuI-catalyzed 1,4-additions and DFT computations concerning the enantioselective mechanism.
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Affiliation(s)
- Eric Brüllingen
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Bernd Goldfuss
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
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22
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Brüllingen E, Neudörfl JM, Goldfuss B. Ligand's electronegativity controls the sense of enantioselectivity in BIFOP-X palladium-catalyzed allylic alkylations. NEW J CHEM 2019. [DOI: 10.1039/c9nj02798j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Palladium-catalyzed allylic alkylations of Na(CH(CO2Me)2 with 1,3-diphenylallyl acetate, employing BIFOP-X (X = H, D, Cl, CN, N3) ligands, yield the C–C coupling product (up to 91% yield, 70% ee). A NBO effect reveals a change of stereochemistry.
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Affiliation(s)
- Eric Brüllingen
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
| | - Bernd Goldfuss
- Department of Chemistry
- University of Cologne
- Organic Chemistry
- 50939 Cologne
- Germany
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23
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Chiha S, Soicke A, Barone M, Müller M, Bruns J, Opitz R, Neudörfl JM, Kühne R, Schmalz HG. Design and Synthesis of Building Blocks for PPII-Helix Secondary-Structure Mimetics: A Stereoselective Entry to 4-Substituted 5-Vinylprolines. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Slim Chiha
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Arne Soicke
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Matthias Barone
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Rössle-Str. 10 13125 Berlin Germany
| | - Matthias Müller
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Rössle-Str. 10 13125 Berlin Germany
| | - Judith Bruns
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Robert Opitz
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Rössle-Str. 10 13125 Berlin Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Ronald Kühne
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); Robert-Rössle-Str. 10 13125 Berlin Germany
| | - Hans-Günther Schmalz
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
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24
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Dato FM, Sheikh M, Uhl RZ, Schüller AW, Steinkrüger M, Koch P, Neudörfl JM, Gütschow M, Goldfuss B, Pietsch M. ω-Phthalimidoalkyl Aryl Ureas as Potent and Selective Inhibitors of Cholesterol Esterase. ChemMedChem 2018; 13:1833-1847. [PMID: 30004170 DOI: 10.1002/cmdc.201800388] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 07/06/2018] [Indexed: 11/09/2022]
Abstract
Cholesterol esterase (CEase), a serine hydrolase thought to be involved in atherogenesis and thus coronary heart disease, is considered as a target for inhibitor development. We investigated recombinant human and murine CEases with a new fluorometric assay in a structure-activity relationship study of a small library of ω-phthalimidoalkyl aryl ureas. The urea motif with an attached 3,5-bis(trifluoromethyl)phenyl group and the aromatic character of the ω-phthalimide residue were most important for inhibitory activity. In addition, an alkyl chain composed of three or four methylene groups, connecting the urea and phthalimide moieties, was found to be an optimal spacer for inhibitors. The so-optimized compounds 2 [1-(3,5-bis(trifluoromethyl)phenyl)-3-(3-(1,3-dioxoisoindolin-2-yl)propyl)urea] and 21 [1-(3,5-bis(trifluoromethyl)phenyl)-3-(4-(1,3-dioxoisoindolin-2-yl)butyl)urea] exhibited dissociation constants (Ki ) of 1-19 μm on the two CEases and showed either a competitive (2 on the human enzyme and 21 on the murine enzyme) or a noncompetitive mode of inhibition. Two related serine hydrolases-monoacylglycerol lipase and fatty acid amide hydrolase-were inhibited by ω-phthalimidoalkyl aryl ureas to a lesser extent.
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Affiliation(s)
- Florian M Dato
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany.,Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Miriam Sheikh
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany
| | - Rocky Z Uhl
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany
| | - Alexandra W Schüller
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany.,Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Michaela Steinkrüger
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany
| | - Peter Koch
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany
| | - Jörg-Martin Neudörfl
- Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Michael Gütschow
- Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, An der Immenburg 4, 53121, Bonn, Germany
| | - Bernd Goldfuss
- Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 4, 50939, Cologne, Germany
| | - Markus Pietsch
- Institute II of Pharmacology, Center of Pharmacology, Medical Faculty, University of Cologne, Gleueler Strasse 24, 50931, Cologne, Germany
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25
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Lingscheid Y, Paul M, Bröhl A, Neudörfl JM, Giernoth R. Determination of inter-ionic and intra-ionic interactions in a monofluorinated imidazolium ionic liquid by a combination of X-ray crystallography and NOE NMR spectroscopy. Magn Reson Chem 2018; 56:80-85. [PMID: 28497466 DOI: 10.1002/mrc.4608] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 04/20/2017] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
We report the very first application of a Transient 1D 1 H{19 F} NOE NMR experiment in neat ionic liquids. In comparison with classical 2D HOESY NMR spectroscopy, a substantial reduction in measurement time is gained with comparable quality and information content of the spectra. In combination with classical X-ray crystallography, we have applied this technique for the determination of inter-ionic distances (i.e. probabilities of presence) utilizing an ionic liquid containing a monofluorinated imidazolium cation. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Yves Lingscheid
- Department für Chemie, Universität zu Köln, Cologne, Germany
| | - Mathias Paul
- Department für Chemie, Universität zu Köln, Cologne, Germany
| | - Andreas Bröhl
- Department für Chemie, Universität zu Köln, Cologne, Germany
| | | | - Ralf Giernoth
- Department für Chemie, Universität zu Köln, Cologne, Germany
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26
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Du Q, Neudörfl JM, Schmalz HG. Chiral Phosphine-Phosphite Ligands in Asymmetric Gold Catalysis: Highly Enantioselective Synthesis of Furo[3,4-d
]-Tetrahydropyridazine Derivatives through [3+3]-Cycloaddition. Chemistry 2018; 24:2379-2383. [DOI: 10.1002/chem.201800042] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Indexed: 12/25/2022]
Affiliation(s)
- Qingwei Du
- Department of Chemistry; University of Cologne; Greinstr. 4, D- 50939 Köln Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry; University of Cologne; Greinstr. 4, D- 50939 Köln Germany
| | - Hans-Günther Schmalz
- Department of Chemistry; University of Cologne; Greinstr. 4, D- 50939 Köln Germany
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27
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Chiha S, Soicke A, Barone M, Müller M, Bruns J, Opitz R, Neudörfl JM, Kühne R, Schmalz HG. Design and Synthesis of Building Blocks for PPII-Helix Secondary-Structure Mimetics: A Stereoselective Entry to 4-Substituted 5-Vinylprolines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701584] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Slim Chiha
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Arne Soicke
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Matthias Barone
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); 13125 Berlin Germany
| | - Matthias Müller
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); 13125 Berlin Germany
| | - Judith Bruns
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Robert Opitz
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); 13125 Berlin Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
| | - Ronald Kühne
- Campus BerlinBuch; Leibniz-Institut für Molekulare Pharmakologie (FMP); 13125 Berlin Germany
| | - Hans-Günther Schmalz
- Department of Chemistry; University of Cologne; Greinstrasse 4 50939 Cologne Germany
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28
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Vailati Facchini S, Neudörfl JM, Pignataro L, Cettolin M, Gennari C, Berkessel A, Piarulli U. Synthesis of [Bis(hexamethylene)cyclopentadienone]iron Tricarbonyl and its Application to the Catalytic Reduction of C=O Bonds. ChemCatChem 2017. [DOI: 10.1002/cctc.201601591] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sofia Vailati Facchini
- Dipartimento di Scienza e Alta Tecnologia; Università degli Studi dell'Insubria; Via Valleggio 11 22100 Como Italy
- Department für Chemie; Universität zu Köln; Greinstraße 4 50939 Köln Germany
| | | | - Luca Pignataro
- Dipartimento di Chimica; Università degli Studi di Milano; Via C. Golgi, 19 20133 Milano Italy
| | - Mattia Cettolin
- Dipartimento di Chimica; Università degli Studi di Milano; Via C. Golgi, 19 20133 Milano Italy
| | - Cesare Gennari
- Dipartimento di Chimica; Università degli Studi di Milano; Via C. Golgi, 19 20133 Milano Italy
| | - Albrecht Berkessel
- Department für Chemie; Universität zu Köln; Greinstraße 4 50939 Köln Germany
| | - Umberto Piarulli
- Dipartimento di Scienza e Alta Tecnologia; Università degli Studi dell'Insubria; Via Valleggio 11 22100 Como Italy
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29
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Abstract
Breslow intermediates, first postulated in 1958, are pivotal intermediates in carbene-catalyzed umpolung. Attempts to isolate and characterize these fleeting amino enol species first met with success in 2012 when we found that saturated bis-Dipp/Mes imidazolidinylidenes readily form isolable, though reactive diamino enols with aldehydes and enals. In contrast, triazolylidenes, upon stoichiometric reaction with aldehydes, gave exclusively the keto tautomer, and no isolable enol. Herein, we present the synthesis of the "missing" keto tautomers of imidazolidinylidene-derived diamino enols, and computational thermodynamic data for 15 enol-ketone pairs derived from various carbenes/aldehydes. Electron-withdrawing substituents on the aldehyde favor enol formation, the same holds for N,N'-Dipp [2,6-di(2-propyl)phenyl] and N,N'-Mes [2,4,6-trimethylphenyl] substitution on the carbene component. The latter effect rests on stabilization of the diamino enol tautomer by Dipp substitution, and could be attributed to dispersive interaction of the 2-propyl groups with the enol moiety. For three enol-ketone pairs, equilibration of the thermodynamically disfavored tautomer was attempted with acids and bases but could not be effected, indicating kinetic inhibition of proton transfer.
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Affiliation(s)
- Mathias Paul
- Department of Chemistry (Organic Chemistry), University of Cologne , Greinstrasse 4, 50939 Cologne, Germany
| | - Martin Breugst
- Department of Chemistry (Organic Chemistry), University of Cologne , Greinstrasse 4, 50939 Cologne, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry (Organic Chemistry), University of Cologne , Greinstrasse 4, 50939 Cologne, Germany
| | - Raghavan B Sunoj
- Department of Chemistry, Indian Institute of Technology Bombay , Powai, Mumbai 400076, India
| | - Albrecht Berkessel
- Department of Chemistry (Organic Chemistry), University of Cologne , Greinstrasse 4, 50939 Cologne, Germany
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30
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Reuter C, Opitz R, Soicke A, Dohmen S, Barone M, Chiha S, Klein MT, Neudörfl JM, Kühne R, Schmalz HG. Design and Stereoselective Synthesis of ProM-2: A Spirocyclic Diproline Mimetic with Polyproline Type II (PPII) Helix Conformation. Chemistry 2015; 21:8464-70. [DOI: 10.1002/chem.201406493] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/11/2015] [Indexed: 11/08/2022]
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31
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Bräutigam M, Teusch N, Schenk T, Sheikh M, Aricioglu RZ, Borowski SH, Neudörfl JM, Baumann U, Griesbeck AG, Pietsch M. Selective Inhibitors of Glutathione Transferase P1 with Trioxane Structure as Anticancer Agents. ChemMedChem 2015; 10:629-39. [DOI: 10.1002/cmdc.201402553] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Indexed: 11/09/2022]
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32
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Abstract
Electrochemical polymerization of tetraaryldiketopyrrolo[3,2-b]pyrrole (isoDPP) derivatives leads to deeply coloured low band gap polymers with reversible oxidation and reduction behaviour and electrochromic properties.
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Affiliation(s)
| | | | - Bernd Tieke
- Department of Chemistry
- University of Cologne
- D-50939 Köln
- Germany
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33
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Sitnikov NS, Kokisheva AS, Fukin GK, Neudörfl JM, Sutorius H, Prokop A, Fokin VV, Schmalz HG, Fedorov AY. Synthesis of Indole-Derived Allocolchicine Congeners through Pd-Catalyzed Intramolecular C-H Arylation Reaction. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402850] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Soicke A, Reuter C, Winter M, Neudörfl JM, Schlörer N, Kühne R, Schmalz HG. Stereoselective Synthesis of Tricyclic Diproline Analogues that Mimic a PPII Helix: Structural Consequences of Ring-Size Variation. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402737] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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35
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Reuter C, Kleczka M, de Mazancourt S, Neudörfl JM, Kühne R, Schmalz HG. Stereoselective Synthesis of Proline-Derived Dipeptide Scaffolds (ProM-3 and ProM-7) Rigidified in a PPII Helix Conformation. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301875] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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36
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Abstract
Deeply coloured 1,6-naphthodifuranone-/1,6-naphthodipyrrolidone-based monomers and polymers are reported. The polymers exhibit broad and strong absorption in the visible region from 400 to 1000 nm, and low band gaps of 1.20–1.41 eV.
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Affiliation(s)
- Haichang Zhang
- Department of Chemistry
- University of Cologne
- D-50939 Cologne, Germany
| | | | - Bernd Tieke
- Department of Chemistry
- University of Cologne
- D-50939 Cologne, Germany
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37
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Hirschhäuser C, Velcicky J, Schlawe D, Hessler E, Majdalani A, Neudörfl JM, Prokop A, Wieder T, Schmalz HG. Nucleoside analogues with a 1,3-diene-Fe(CO)3 substructure: stereoselective synthesis, configurational assignment, and apoptosis-inducing activity. Chemistry 2013; 19:13017-29. [PMID: 23934861 DOI: 10.1002/chem.201301672] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Indexed: 01/09/2023]
Abstract
The synthesis and stereochemical assignment of two classes of iron-containing nucleoside analogues, both of which contain a butadiene-Fe(CO)3 substructure, is described. The first type of compounds are Fe(CO)3-complexed 3'-alkenyl-2',3'-dideoxy-2',3'-dehydro nucleosides (2,5-dihydrofuran derivatives), from which the second class of compounds is derived by formal replacement of the ring oxygen atom by a CH2 group (carbocyclic nucleoside analogues). These compounds were prepared in a stereoselective manner through the metal-assisted introduction of the nucleobase. Whilst the furanoid intermediates were prepared from carbohydrates (such as methyl-glucopyranoside), the carbocyclic compounds were obtained by using an intramolecular Pauson-Khand reaction. Stereochemical assignments based on NMR and CD spectroscopy were confirmed by X-ray structural analysis. Biological investigations revealed that several of the complexes exhibited pronounced apoptosis-inducing properties (through an unusual caspase 3-independent but ROS-dependent pathway). Furthermore, some structure-activity relationships were identified, also as a precondition for the design and synthesis of fluorescent and biotin-labeled conjugates.
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Affiliation(s)
- Christoph Hirschhäuser
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln (Germany), Fax: (+49) 221-470-3064
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38
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Affiliation(s)
- Haichang Zhang
- Department of Chemistry, University
of Cologne, Luxemburger Strasse 116, D-50939 Cologne Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University
of Cologne, Luxemburger Strasse 116, D-50939 Cologne Germany
| | - Bernd Tieke
- Department of Chemistry, University
of Cologne, Luxemburger Strasse 116, D-50939 Cologne Germany
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39
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Hack V, Reuter C, Opitz R, Schmieder P, Beyermann M, Neudörfl JM, Kühne R, Schmalz HG. Efficient α-Helix Induction in a Linear Peptide Chain byN-Capping with a Bridged-tricyclic Diproline Analogue. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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40
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Hack V, Reuter C, Opitz R, Schmieder P, Beyermann M, Neudörfl JM, Kühne R, Schmalz HG. Efficient α-Helix Induction in a Linear Peptide Chain byN-Capping with a Bridged-tricyclic Diproline Analogue. Angew Chem Int Ed Engl 2013; 52:9539-43. [DOI: 10.1002/anie.201302014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Revised: 04/11/2013] [Indexed: 11/11/2022]
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41
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Botov S, Stamellou E, Romanski S, Guttentag M, Alberto R, Neudörfl JM, Yard B, Schmalz HG. Synthesis and Performance of Acyloxy-diene-Fe(CO)3 Complexes with Variable Chain Lengths as Enzyme-Triggered Carbon Monoxide-Releasing Molecules. Organometallics 2013. [DOI: 10.1021/om301233h] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Svetlana Botov
- Department für Chemie, Universität zu Köln, Greinstrasse 4,
D-50939 Köln, Germany
| | - Eleni Stamellou
- Medizinische Klinik, Universitätsmedizin Mannheim, 68167 Mannheim, Germany
| | - Steffen Romanski
- Department für Chemie, Universität zu Köln, Greinstrasse 4,
D-50939 Köln, Germany
| | - Miguel Guttentag
- Institut für Anorganische Chemie, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Roger Alberto
- Institut für Anorganische Chemie, Universität Zürich, CH-8057 Zürich, Switzerland
| | - Jörg-Martin Neudörfl
- Department für Chemie, Universität zu Köln, Greinstrasse 4,
D-50939 Köln, Germany
| | - Benito Yard
- Medizinische Klinik, Universitätsmedizin Mannheim, 68167 Mannheim, Germany
| | - Hans-Günther Schmalz
- Department für Chemie, Universität zu Köln, Greinstrasse 4,
D-50939 Köln, Germany
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42
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Hegemann C, Tyrra W, Neudörfl JM, Mathur S. Synthetic and Structural Investigations on the Reactivity of the Cd–I Bond in [ICd{Zr2(OPri)9}] to Construct New Mixed-Metal Alkoxides. Organometallics 2013. [DOI: 10.1021/om301053b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Corinna Hegemann
- Institute
of Inorganic Chemistry and ‡Institute of Organic
Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
| | - Wieland Tyrra
- Institute
of Inorganic Chemistry and ‡Institute of Organic
Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
| | - Jörg-Martin Neudörfl
- Institute
of Inorganic Chemistry and ‡Institute of Organic
Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
| | - Sanjay Mathur
- Institute
of Inorganic Chemistry and ‡Institute of Organic
Chemistry, Department of Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
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43
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Zhang H, Welterlich I, Neudörfl JM, Tieke B, Yang C, Chen X, Yang W. Synthesis and characterization of 1,3,4,6-tetraarylpyrrolo[3,2-b]-pyrrole-2,5-dione (isoDPP)-based donor–acceptor polymers with low band gap. Polym Chem 2013. [DOI: 10.1039/c3py00570d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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44
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Affiliation(s)
- Wibke Lölsberg
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Susen Werle
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstrasse 4, 50939 Köln, Germany
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45
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Termath AO, Ritter S, König M, Kranz DP, Neudörfl JM, Prokop A, Schmalz HG. Synthesis of Oxa-B-Ring Analogs of Colchicine through Rh-Catalyzed Intramolecular [5+2] Cycloaddition. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200677] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Kranz DP, Chiha S, Meier zu Greffen A, Neudörfl JM, Schmalz HG. Synthesis of B-Ring-Modified Steroids through BF3-Promoted Rearrangement/Substitution of 6β-Hydroxy-5,19-cyclosteroids. Org Lett 2012; 14:3692-5. [DOI: 10.1021/ol301532w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Darius P. Kranz
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | - Slim Chiha
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | | | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
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47
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Romanski S, Rücker H, Stamellou E, Guttentag M, Neudörfl JM, Alberto R, Amslinger S, Yard B, Schmalz HG. Iron Dienylphosphate Tricarbonyl Complexes as Water-Soluble Enzyme-Triggered CO-Releasing Molecules (ET-CORMs). Organometallics 2012. [DOI: 10.1021/om300359a] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Steffen Romanski
- Department für Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln,
Germany
| | - Hannelore Rücker
- Institut für Organische Chemie, Universität Regensburg, 93503
Regensburg, Germany
| | - Eleni Stamellou
- Medizinische Klinik, Universitätsmedizin Mannheim, 68167 Mannheim, Germany
| | - Miguel Guttentag
- Institut
für Anorganische Chemie, Universität Zürich, CH-8057 Zürich,
Switzerland
| | - Jörg-Martin Neudörfl
- Department für Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln,
Germany
| | - Roger Alberto
- Institut
für Anorganische Chemie, Universität Zürich, CH-8057 Zürich,
Switzerland
| | - Sabine Amslinger
- Institut für Organische Chemie, Universität Regensburg, 93503
Regensburg, Germany
| | - Benito Yard
- Medizinische Klinik, Universitätsmedizin Mannheim, 68167 Mannheim, Germany
| | - Hans-Günther Schmalz
- Department für Chemie, Universität zu Köln, Greinstrasse 4, D-50939 Köln,
Germany
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48
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Romanski S, Kraus B, Guttentag M, Schlundt W, Rücker H, Adler A, Neudörfl JM, Alberto R, Amslinger S, Schmalz HG. Acyloxybutadiene tricarbonyl iron complexes as enzyme-triggered CO-releasing molecules (ET-CORMs): a structure–activity relationship study. Dalton Trans 2012; 41:13862-75. [DOI: 10.1039/c2dt30662j] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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49
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Saiai A, Bielig H, Velder J, Neudörfl JM, Menning M, Kufer TA, Schmalz HG. Hydrophenalene–Cr(CO)3 complexes as anti-inflammatory agents based on specific inhibition of NOD2 signalling: a SAR study. Med Chem Commun 2012. [DOI: 10.1039/c2md20221b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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50
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Falk A, Fiebig L, Neudörfl JM, Adler A, Schmalz HG. Rhodium-Catalyzed Enantioselective Intramolecular [4+2] Cycloaddition using a Chiral Phosphine-Phosphite Ligand: Importance of Microwave-Assisted Catalyst Conditioning. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100658] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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