1
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Charoughchi S, Liu JT, Berteau-Rainville M, Hase H, Askari MS, Bhagat S, Forgione P, Salzmann I. Sterically-Hindered Molecular p-Dopants Promote Integer Charge Transfer in Organic Semiconductors. Angew Chem Int Ed Engl 2023:e202304964. [PMID: 37220083 DOI: 10.1002/anie.202304964] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/14/2023] [Accepted: 05/22/2023] [Indexed: 05/25/2023]
Abstract
Molecular p-dopants designed to undergo electron transfer with organic semiconductors are typically planar molecules with high electron affinity. However, their planarity can promote the formation of ground-state charge transfer complexes with the semiconductor host and results in fractional instead of integer charge transfer, which is highly detrimental to doping efficiency. Here, we show this process can be readily overcome by targeted dopant design exploiting steric hindrance. To this end, we synthesize and characterize the remarkably stable p-dopant 2,2',2''-(cyclopropane-1,2,3-triylidene)tris(2-(perfluorophenyl)acetonitrile) comprising pendant functional groups that sterically shield its central core while retaining high electron affinity. Finally, we demonstrate it outperforms a planar dopant of identical electron affinity and increases the thin film conductivity by up to an order of magnitude. We believe exploiting steric hindrance represents a promising design strategy towards molecular dopants of enhanced doping efficiency.
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Affiliation(s)
- Somaiyeh Charoughchi
- Concordia University, Department of Chemistry and Biochemistry, H4B 1R6, Montreal, CANADA
| | - Jiang Tian Liu
- Concordia University, Department of Chemistry and Biochemistry, H4B 1R6, Montreal, CANADA
| | - Melissa Berteau-Rainville
- Institut national de la recherche scientifique, Centre Énergie Matériaux Télécommunications, J3X 1P7, Varennes, CANADA
| | - Hannes Hase
- Concordia University, Department of Physics, H4B 1R6, Montreal, CANADA
| | - Mohammad Sharif Askari
- Concordia University, Department of Chemistry and Biochemistry, H4B 1R6, Montreal, CANADA
| | | | - Pat Forgione
- Concordia University, Department of Chemistry and Biochemistry, H4B 1R6, Montreal, CANADA
| | - Ingo Salzmann
- Concordia University, Department of Chemistry and Biochemistry, Department of Physics, H4B 1R6, Montreal, CANADA
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2
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Chacón-Huete F, Messina C, Cigana B, Forgione P. Diverse Applications of Biomass-Derived 5-Hydroxymethylfurfural and Derivatives as Renewable Starting Materials. ChemSusChem 2022; 15:e202200328. [PMID: 35652539 DOI: 10.1002/cssc.202200328] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/29/2022] [Indexed: 06/15/2023]
Abstract
This Review summarizes recent efforts to capitalize on 5-hydroxymethylfurfural (HMF) and related furans as emerging building blocks for the synthesis of fine chemicals and materials, with a focus on advanced applications within medicinal and polymer chemistry, as well as nanomaterials. As with all chemical industries, these fields have historically relied heavily on petroleum-derived starting materials, an unsustainable and polluting feedstock. Encouragingly, the emergent chemical versatility of biomass-derived furans has been shown to facilitate derivatization towards valuable targets. Continued work on the synthetic manipulation of HMF, and related derivatives, for access to a wide range of target compounds and materials is crucial for further development. Increasingly, biomass-derived furans are being utilized for a wide range of chemical applications, the continuation of which is paramount to accelerate the paradigm shift towards a sustainable chemical industry.
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Affiliation(s)
- Franklin Chacón-Huete
- Department of Chemistry and Biochemistry and Centre for Green Chemistry and Catalysis, Concordia University, 7141, rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
| | - Cynthia Messina
- Department of Chemistry and Biochemistry and Centre for Green Chemistry and Catalysis, Concordia University, 7141, rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
| | - Brandon Cigana
- Department of Chemistry and Biochemistry and Centre for Green Chemistry and Catalysis, Concordia University, 7141, rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry and Centre for Green Chemistry and Catalysis, Concordia University, 7141, rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
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3
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Hernandez R RA, Burchell-Reyes K, Braga APCA, Lopez JK, Forgione P. Solvent-free synthesis of 3,5-isoxazoles via 1,3-dipolar cycloaddition of terminal alkynes and hydroxyimidoyl chlorides over Cu/Al 2O 3 surface under ball-milling conditions. RSC Adv 2022; 12:6396-6402. [PMID: 35424611 PMCID: PMC8981965 DOI: 10.1039/d1ra08443g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 01/05/2022] [Accepted: 02/10/2022] [Indexed: 01/20/2023] Open
Abstract
Scalable, solvent-free synthesis of 3,5-isoxazoles under ball-milling conditions has been developed. The proposed methodology allows the synthesis of 3,5-isoxazoles in moderate to excellent yields from terminal alkynes and hydroxyimidoyl chlorides, using a recyclable Cu/Al2O3 nanocomposite catalyst. Furthermore, the proposed conditions are reproducible to a 1.0-gram scale without further milling time variations. A practical and scalable mechanochemical 1,3-dipolar cycloaddition between hydroxyimidoyl chlorides and terminal alkynes catalyzed by Cu/Al2O3 allows a quick access to 3,5-isoxazole derivatives.![]()
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Affiliation(s)
- Rafael A Hernandez R
- Department of Chemistry and Biochemistry, Concordia University 7141 rue Sherbrooke O. Montréal QC Canada H4B 1R6
| | - Kelly Burchell-Reyes
- Department of Chemistry and Biochemistry, Concordia University 7141 rue Sherbrooke O. Montréal QC Canada H4B 1R6
| | - Arthur P C A Braga
- Department of Chemistry and Biochemistry, Concordia University 7141 rue Sherbrooke O. Montréal QC Canada H4B 1R6
| | - Jennifer Keough Lopez
- Department of Chemistry and Biochemistry, Concordia University 7141 rue Sherbrooke O. Montréal QC Canada H4B 1R6
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University 7141 rue Sherbrooke O. Montréal QC Canada H4B 1R6 .,Centre for Green Chemistry and Catalysis, McGill University 801 rue Sherbrooke O. Montréal QC Canada H3A 0B8
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4
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Chacón‐Huete F, Covone J, Zaroubi L, Forgione P. Efficient Synthesis of Bis(5‐arylfuran‐2‐yl)methane Scaffolds Utilizing Biomass‐Derived Starting Materials. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101571] [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: 11/11/2022]
Affiliation(s)
- Franklin Chacón‐Huete
- Chemistry and Biochemistry Department Concordia University 7141 Sherbrooke West Montreal Quebec H4B1R6 Canada
| | - Jason Covone
- Chemistry and Biochemistry Department Concordia University 7141 Sherbrooke West Montreal Quebec H4B1R6 Canada
| | - Liana Zaroubi
- Chemistry and Biochemistry Department Concordia University 7141 Sherbrooke West Montreal Quebec H4B1R6 Canada
| | - Pat Forgione
- Chemistry and Biochemistry Department Concordia University 7141 Sherbrooke West Montreal Quebec H4B1R6 Canada
- Centre in Green Chemistry and Catalysis McGill University 801 Sherbrooke Street West Montreal Quebec H3A0B8 Canada
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5
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Jaunky DB, Larocque K, Husser MC, Liu JT, Forgione P, Piekny A. Characterization of a recently synthesized microtubule-targeting compound that disrupts mitotic spindle poles in human cells. Sci Rep 2021; 11:23665. [PMID: 34880347 PMCID: PMC8655040 DOI: 10.1038/s41598-021-03076-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/28/2021] [Accepted: 11/26/2021] [Indexed: 11/09/2022] Open
Abstract
We reveal the effects of a new microtubule-destabilizing compound in human cells. C75 has a core thienoisoquinoline scaffold with several functional groups amenable to modification. Previously we found that sub micromolar concentrations of C75 caused cytotoxicity. We also found that C75 inhibited microtubule polymerization and competed with colchicine for tubulin-binding in vitro. However, here we found that the two compounds synergized suggesting differences in their mechanism of action. Indeed, live imaging revealed that C75 causes different spindle phenotypes compared to colchicine. Spindles remained bipolar and collapsed after colchicine treatment, while C75 caused bipolar spindles to become multipolar. Importantly, microtubules rapidly disappeared after C75-treatment, but then grew back unevenly and from multiple poles. The C75 spindle phenotype is reminiscent of phenotypes caused by depletion of ch-TOG, a microtubule polymerase, suggesting that C75 blocks microtubule polymerization in metaphase cells. C75 also caused an increase in the number of spindle poles in paclitaxel-treated cells, and combining low amounts of C75 and paclitaxel caused greater regression of multicellular tumour spheroids compared to each compound on their own. These findings warrant further exploration of C75’s anti-cancer potential.
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Affiliation(s)
| | - Kevin Larocque
- Department of Biology, Concordia University, Montreal, QC, Canada
| | - Mathieu C Husser
- Department of Biology, Concordia University, Montreal, QC, Canada
| | - Jiang Tian Liu
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
| | - Alisa Piekny
- Department of Biology, Concordia University, Montreal, QC, Canada.
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6
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Liu JT, Jaunky DB, Larocque K, Chen F, Mckibbon K, Sirouspour M, Taylor S, Shafeii A, Campbell D, Braga H, Piekny A, Forgione P. Design, structure-activity relationship study and biological evaluation of the thieno[3,2-c]isoquinoline scaffold as a potential anti-cancer agent. Bioorg Med Chem Lett 2021; 52:128327. [PMID: 34416378 DOI: 10.1016/j.bmcl.2021.128327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 05/05/2021] [Revised: 08/09/2021] [Accepted: 08/10/2021] [Indexed: 12/12/2022]
Abstract
Several derivatives of a series that share a thienoisoquinoline scaffold have demonstrated potent activity against cancer cell lines A549, HeLa, HCT-116, and MDA-MB-231 in the submicromolar concentration range. Structure-activity relationship (SAR) studies on a range of derivatives aided in identifying key pharmacophores in the lead compound. A series of compounds have been identified as the most promising with submicromolar IC50 values against a lung cancer cell line (A549). Microscopy studies of cancer cells treated with the lead compound revealed that it causes mitotic arrest and disrupts microtubules. Further evaluation via an in vitro microtubule polymerization assay and competition studies indicate that the lead compound binds to tubulin via the colchicine site.
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Affiliation(s)
- Jiang Tian Liu
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Dilan B Jaunky
- Department of Biology, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Kevin Larocque
- Department of Biology, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Fei Chen
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Keegan Mckibbon
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Mehdi Sirouspour
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Sarah Taylor
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Alexandre Shafeii
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Donald Campbell
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Helena Braga
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Alisa Piekny
- Department of Biology, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada
| | - Pat Forgione
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6, Canada; Center for Green Chemistry and Catalysis, Department of Chemistry, McGill University, 801 rue Sherbrooke O., Montréal, QC H3A 0B8, Canada.
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7
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Abstract
Herein, we report a modular synthetic route to access tetra-arylated thiophene compounds with four different substituents with programmed chemical control provided by an ester activating/directing group. This method enables the functionalization of individual positions of thiophene sequentially via regioselective halogenations and cross-coupling reactions. The reaction sequence described provides tetra-arylated thiophenes in higher yields than previous routes and employs practical reaction protocols, simple catalytic systems, and short reaction times.
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Affiliation(s)
- Cynthia Messina
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Xavier Ottenwaelder
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, Montreal, Quebec H4B 1R6, Canada
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8
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Chacón-Huete F, Lasso JD, Szavay P, Covone J, Forgione P. Synthesis of 2,5-Diaryl Nonsymmetric Furans C6-Platform Chemicals via Catalytic Conversion of Biomass and the Formal Synthesis of Dantrolene. J Org Chem 2021; 86:515-524. [PMID: 33253575 DOI: 10.1021/acs.joc.0c02236] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biomass-derived commodity chemical 5-hydroxymethyl furfural is an underutilized C6-platform chemical derived from cellulose that is ideal to prepare next-generation value-added products. We have developed an efficient synthetic strategy to access 2,5-diaryl nonsymmetric furans from 5-hydroxymethyl furfural utilizing decarboxylative cross-couplings. A key finding was that the presence of the hydroxymethyl handle enhances the yields of the palladium-catalyzed decarboxylative cross-coupling reaction. The method provides access to a broad-range nonsymmetric 2,5-diaryl furans where each arene can be systematically introduced as required. Additionally, this green synthetic strategy was employed for a formal synthesis of the muscle relaxant Dantrolene in excellent yields.
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Affiliation(s)
- Franklin Chacón-Huete
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal QC H4B 1R6, Canada.,Centre in Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street West, Montreal QC H3A 2K6, Canada
| | - Juan David Lasso
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal QC H4B 1R6, Canada
| | - Paul Szavay
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal QC H4B 1R6, Canada
| | - Jason Covone
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal QC H4B 1R6, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montreal QC H4B 1R6, Canada.,Centre in Green Chemistry and Catalysis, McGill University, 801 Sherbrooke Street West, Montreal QC H3A 2K6, Canada
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9
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Messina C, Douglas LZ, Liu JT, Forgione P. Successive Pd‐Catalyzed Decarboxylative Cross‐Couplings for the Modular Synthesis of Non‐Symmetric Di‐Aryl‐Substituted Thiophenes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000780] [Citation(s) in RCA: 4] [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: 12/21/2022]
Affiliation(s)
- Cynthia Messina
- Department of Chemistry and Biochemistry Concordia University 7141 Sherbrooke Street West H4B 1R6 Montreal Quebec Canada
- Centre in Green Chemistry and Catalysis 801 Sherbrooke Street West H3A 0B8 Montreal Quebec Canada
| | - Liam Z. Douglas
- Department of Chemistry and Biochemistry Concordia University 7141 Sherbrooke Street West H4B 1R6 Montreal Quebec Canada
| | - Jiang Tian Liu
- Department of Chemistry and Biochemistry Concordia University 7141 Sherbrooke Street West H4B 1R6 Montreal Quebec Canada
- Centre in Green Chemistry and Catalysis 801 Sherbrooke Street West H3A 0B8 Montreal Quebec Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry Concordia University 7141 Sherbrooke Street West H4B 1R6 Montreal Quebec Canada
- Centre in Green Chemistry and Catalysis 801 Sherbrooke Street West H3A 0B8 Montreal Quebec Canada
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10
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França TCC, Bastos LDC, Cuya T, Sirouspour M, Chacón-Huete F, Bendahan D, Forgione P. Microwave-assisted Synthesis and Docking Studies of Phenylureas as Candidates for the Drug Design Against the Biological Warfare Agent Yersinia Pestis. LETT DRUG DES DISCOV 2020. [DOI: 10.2174/1570180816666190710144212] [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: 11/22/2022]
Abstract
Background:
Bubonic plague is amongst the diseases with the highest potential for being
used in biological warfare attacks today. This disease, caused by the bacterium Yersina pestis, is
highly infectious and can achieve 100% of fatal victims when in its most dangerous form. Besides,
there is no effective vaccine, and the chemotherapy available today against plague is ineffective if
not administered at the beginning of the infection.
Objective:
Willing to contribute for changing this reality we propose here new phenylureas as candidates
for the drug design against plague meant to target the enzyme dihydrofolate reductase from
Y. pestis (YpDHFR).
Methods:
Seven phenylureas, four of them new, were synthesized, following synthetic routes
adapted from procedures available in the literature, and using microwave irradiation. After, they
were submitted to docking studies inside YpDHFR and human DHFR (HssDHFR) in order to check
their potential as selective inhibitors.
Results:
Our results revealed four new phenylureas and a new synthetic route for this kind of molecule
using microwave irradiation. Also, our docking studies showed that these compounds are capable
of binding to both HssDHFR and YpDHFR, with U1 - U4 and U23 showing more selectivity for
HssDHFR and U7, U8 being more selective towards YpDHFR.
Conclusion:
We reported the synthesis with good yields of seven phenylureas, following a simple
and clean alternative synthetic route using microwave irradiation. Further molecular docking studies
of our compounds suggested that two are capable of binding more selectivity to YpDHFR, qualifying
as potential candidates for the drug design of new drugs against plague.
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Affiliation(s)
- Tanos Celmar Costa França
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ, Brazil
| | - Leonardo da Costa Bastos
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ, Brazil
| | - Teobaldo Cuya
- Faculty of Technology, Department of Mathematics, Physics and Computation, University of the State of Rio de Janeiro, Resende, RJ, Brazil
| | - Mehdi Sirouspour
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
| | - Franklin Chacón-Huete
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
| | - David Bendahan
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, Montreal, QC, Canada
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11
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Liu JT, Hase H, Taylor S, Salzmann I, Forgione P. Approaching the Integer‐Charge Transfer Regime in Molecularly Doped Oligothiophenes by Efficient Decarboxylative Cross‐Coupling. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914458] [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: 11/12/2022]
Affiliation(s)
- Jiang Tian Liu
- Department of Chemistry and Biochemistry Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
| | - Hannes Hase
- Department of Physics Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
| | - Sarah Taylor
- Department of Chemistry and Biochemistry Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
| | - Ingo Salzmann
- Department of Chemistry and Biochemistry Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
- Department of Physics Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
- Centre for Research in Molecular Modeling (CERMM) Centre for NanoScience Research (CeNSR) Concordia University 7141 rue Sherbrooke O. Montreal QC H4B 1R6 Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry Concordia University 7141 rue Sherbrooke O. Montréal QC H4B 1R6 Canada
- Center for Green Chemistry and Catalysis McGill University 801 rue Sherbrooke O. Montréal QC H3A 0B8 Canada
- Centre for Research in Molecular Modeling (CERMM) Centre for NanoScience Research (CeNSR) Concordia University 7141 rue Sherbrooke O. Montreal QC H4B 1R6 Canada
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12
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Liu JT, Hase H, Taylor S, Salzmann I, Forgione P. Approaching the Integer-Charge Transfer Regime in Molecularly Doped Oligothiophenes by Efficient Decarboxylative Cross-Coupling. Angew Chem Int Ed Engl 2020; 59:7146-7153. [PMID: 31961982 DOI: 10.1002/anie.201914458] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 11/12/2019] [Indexed: 01/08/2023]
Abstract
A library of symmetrical linear oligothiophene was prepared employing decarboxylative cross-coupling reaction as the key transformation. Thiophene potassium carboxylate salts were used as cross-coupling partners without the need of co-catalyst, base, or additives. This method demonstrates complete chemoselectivity and is a comprehensive greener approach compared to the existing methods. The modularity of this approach is demonstrated with the preparation of discreet oligothiophenes with up to 10 thiophene repeat units. Symmetrical oligothiophenes are prototypical organic semiconductors where their molecular electrical doping as a function of the chain length can be assessed spectroscopically. An oligothiophene critical length for integer charge transfer was observed to be 10 thiophene units, highlighting the potential use of discrete oligothiophenes as doped conduction or injection layers in organic electronics applications.
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Affiliation(s)
- Jiang Tian Liu
- Department of Chemistry and Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada
| | - Hannes Hase
- Department of Physics, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada
| | - Sarah Taylor
- Department of Chemistry and Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada
| | - Ingo Salzmann
- Department of Chemistry and Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada.,Department of Physics, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada.,Centre for Research in Molecular Modeling (CERMM), Centre for NanoScience Research (CeNSR), Concordia University, 7141 rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, 7141 rue Sherbrooke O., Montréal, QC, H4B 1R6, Canada.,Center for Green Chemistry and Catalysis, McGill University, 801 rue Sherbrooke O., Montréal, QC, H3A 0B8, Canada.,Centre for Research in Molecular Modeling (CERMM), Centre for NanoScience Research (CeNSR), Concordia University, 7141 rue Sherbrooke O., Montreal, QC, H4B 1R6, Canada
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13
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Liang Y, Manioudakis J, Macairan JR, Askari MS, Forgione P, Naccache R. Facile Aqueous-Phase Synthesis of an Ultrasmall Bismuth Nanocatalyst for the Reduction of 4-Nitrophenol. ACS Omega 2019; 4:14955-14961. [PMID: 31552336 PMCID: PMC6751691 DOI: 10.1021/acsomega.9b01736] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/06/2019] [Indexed: 05/28/2023]
Abstract
Bismuth metallic nanoparticles have evoked considerable interest in catalysis owing to their small size, high surface area-to-volume ratio, and low toxicity. However, the need for toxic reductants and organic solvents in their synthesis often limits their desirability for application development. Here, we describe a green strategy to synthesize bismuth nanodots via the redox reactions between bismuth nitrate and d-glucose, in the presence of poly(vinylpyrrolidone) in the basic aqueous phase. Both reagents play a crucial role in the formation of monodisperse bismuth nanodots acting as mild reducing and capping agents, respectively. We further demonstrate that the catalytic activity of these dots via the successful reduction of the environmental contaminant 4-nitrophenol to its useful 4-aminophenol analogue requiring only 36 μg/mL nanocatalyst for 20 mM of the substrate. Moreover, they can be recovered and recycled in multiple reactions before the onset of an appreciable loss of catalytic activity. The proposed facile synthetic route and inexpensive matrix materials lead the way to access bismuth nanodots for both the fundamental study of reactions and their industrial catalysis applications.
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Affiliation(s)
- Yanjie Liang
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - John Manioudakis
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Jun-Ray Macairan
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
| | - Mohammad S. Askari
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
- Centre
for Green Chemistry and Catalysis, Montreal, Quebec H4B 1R6, Canada
| | - Pat Forgione
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
- Centre
for Green Chemistry and Catalysis, Montreal, Quebec H4B 1R6, Canada
| | - Rafik Naccache
- Department
of Chemistry and Biochemistry, Center for NanoScience Research, and Quebec Centre
for Advanced Materials, Concordia University, Montreal, Quebec H4B 1R6, Canada
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14
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Zhang X, Chen F, Petrella A, Chacón-Huete F, Covone J, Tsai TW, Yu CC, Forgione P, Kwan DH. A High-Throughput Glycosyltransferase Inhibition Assay for Identifying Molecules Targeting Fucosylation in Cancer Cell-Surface Modification. ACS Chem Biol 2019; 14:715-724. [PMID: 30831024 DOI: 10.1021/acschembio.8b01123] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In cancers, increased fucosylation (attachment of fucose sugar residues) on cell-surface glycans, resulting from the abnormal upregulation of the expression of specific fucosyltransferase enzymes (FUTs), is one of the most important types of glycan modifications associated with malignancy. Fucosylated glycans on cell surfaces are involved in a multitude of cellular interactions and signal regulation in normal biological processes, as well as in disease. For example, sialyl LewisX is a fucosylated cell-surface glycan that is abnormally abundant in some cancers where it has been implicated in facilitating metastasis, allowing circulating tumor cells to bind to the epithelial tissue within blood vessels and invade into secondary sites by taking advantage of glycan-mediated interactions. To identify inhibitors of FUT enzymes as potential cancer therapeutics, we have developed a novel high-throughput assay that makes use of a fluorogenically labeled oligosaccharide as a probe of fucosylation. This probe, which consists of a 4-methylumbelliferyl glycoside, is recognized and hydrolyzed by specific glycoside hydrolase enzymes to release fluorescent 4-methylumbelliferone, yet when the probe is fucosylated prior to treatment with the glycoside hydrolases, hydrolysis does not occur and no fluorescent signal is produced. We have demonstrated that this assay can be used to measure the inhibition of FUT enzymes by small molecules, because blocking fucosylation will allow glycosidase-catalyzed hydrolysis of the labeled oligosaccharide to produce a fluorescent signal. Employing this assay, we have screened a focused library of small molecules for inhibitors of a human FUT enzyme involved in the synthesis of sialyl LewisX and demonstrated that our approach can be used to identify potent FUT inhibitors from compound libraries in microtiter plate format.
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Affiliation(s)
| | | | | | | | | | - Teng-Wei Tsai
- Department of Chemistry and Biochemistry, National Chung-Cheng University, 168 University Road, Min-Hsiung, Chiayi 62102, Taiwan
| | - Ching-Ching Yu
- Department of Chemistry and Biochemistry, National Chung-Cheng University, 168 University Road, Min-Hsiung, Chiayi 62102, Taiwan
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15
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Bastos LDC, de Souza FR, Pereira Souza LM, Forgione P, Cuya T, de Alencastro RB, Pimentel AS, Celmar Costa França T. Investigating the selectivity of potential new inhibitors of dihydrofolate reductase from Yersinia pestis designed by molecular modeling. J Biomol Struct Dyn 2018. [PMID: 29542379 DOI: 10.1080/07391102.2018.1452796] [Citation(s) in RCA: 2] [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: 10/17/2022]
Affiliation(s)
- Leonardo da Costa Bastos
- a Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD) , Military Institute of Engieering , Rio de Janeiro 22290-270 , RJ , Brazil
| | - Felipe Rodrigues de Souza
- a Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD) , Military Institute of Engieering , Rio de Janeiro 22290-270 , RJ , Brazil
| | - Lucas Miguel Pereira Souza
- b Department of Chemistry , Pontifical Catholic University of Rio de Janeiro , Rio de Janeiro 22453-900 , RJ , Brazil
| | - Pat Forgione
- c Department of Chemistry & Biochemistry , Concordia University , Montreal , QC , Canada
| | - Teobaldo Cuya
- d Faculty of Technology, Department of Mathematics, Physics and Computation , University of the State of Rio de Janeiro , Resende , RJ , Brazil
| | | | - Andre Silva Pimentel
- b Department of Chemistry , Pontifical Catholic University of Rio de Janeiro , Rio de Janeiro 22453-900 , RJ , Brazil
| | - Tanos Celmar Costa França
- a Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD) , Military Institute of Engieering , Rio de Janeiro 22290-270 , RJ , Brazil.,f Faculty of Informatics and Management, Center for Basic and Applied Research , University of Hradec Kralove , Hradec Kralove , Czech Republic
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16
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Forgione P, Chen F, Chacón-Huete F, El-Husseini H. Convenient and Inexpensive Route to Sulfonylated Pyridines via SNAr Reaction of Electron-Rich Pyridines by Iron Catalysis. SYNTHESIS-STUTTGART 2018. [DOI: 10.1055/s-0036-1591541] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Sulfonylated pyridines were synthesized in moderate to excellent yields, with a wide scope of substituted pyridines and sulfinate salts as starting materials, by an iron-catalyzed SNAr reaction. This new methodology exhibits advantages for the synthesis of these useful substrates, such as the use of a readily available, inexpensive catalyst, prevention of the disproportionation of the sulfinate salts, and, more importantly, providing access to electron-rich pyridine substrates.
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Affiliation(s)
- Pat Forgione
- Department of Chemistry & Biochemistry, Concordia University
- Centre for Green Chemistry and Catalysis
| | - Fei Chen
- Department of Chemistry & Biochemistry, Concordia University
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Jaunky DB, Larocque K, Suardiaz JP, Yang D, Furze EJ, Forgione P, Piekny A. Abstract 3247: Discovery of a novel drug that affects centrosome clustering. Cancer Res 2017. [DOI: 10.1158/1538-7445.am2017-3247] [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
Abstract
Our goal is to identify molecular regulators of a mechanism that occurs uniquely in cancer cells, and to develop a selective anti-cancer drug. Most chemotherapies are non-selective, causing severe side-effects. In additions, cancers often develop resistance to some of the more commonly used chemotherapies. To expand the repertoire of available drugs, and to design drugs that are selective, we need to identify molecules that regulate the physiological changes that occur primarily in cancer cells. For example, cancer cells in many hard-to-treat cancers have aberrant centrosomes, which may be supernumerary or fragmented. During mitosis, these aberrant centrosomes must cluster to form bipolar spindles for successful division. Thus, targeting a process like centrosome clustering is ideal, since it is not necessary in healthy cells. We synthesized a small, stable scaffold with amenability to structure-activity-relationship studies, and found several analogues with IC50 values < 50 nM, depending on the cancer cell line. Preliminary tests showed that these compounds prevent tumors from forming and/or cause their regression in vitro. We performed cell biological studies to characterize their mechanism of action. In several different types of cancer cells, these compounds cause mitotic arrest and centrosome declustering at concentrations where they have little affect on non-cancerous cells. Live imaging revealed that within minutes of adding the compounds to HeLa cells expressing GFP-tagged tubulin, we observed rapid microtubule depolymerization and centrosome declustering. After washing out the compound, microtubule polymerization recovered, but the mitotic spindles were multipolar. Adding similar concentrations of Nocodazole, a microtubule-depolymerizing drug, also caused rapid microtubule depolymerization, but after washing out the drug, the spindles were bipolar. We are in the process of identifying the molecular target of these compounds to provide crucial insight to the mechanism governing centrosome clustering, and are continuing to perform SAR studies to obtain compounds with higher efficacy and selectivity.
Citation Format: Dilan B. Jaunky, Kevin Larocque, Javier Porro Suardiaz, Dan Yang, Emma J. Furze, Pat Forgione, Alisa Piekny. Discovery of a novel drug that affects centrosome clustering [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 3247. doi:10.1158/1538-7445.AM2017-3247
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Affiliation(s)
| | | | | | - Dan Yang
- Concordia University, Montreal, Quebec, Canada
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18
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Ennis D, Despland E, Chen F, Forgione P, Bauce E. Spruce budworm feeding and oviposition are stimulated by monoterpenes in white spruce epicuticular waxes. Insect Sci 2017; 24:73-80. [PMID: 26463122 DOI: 10.1111/1744-7917.12279] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/07/2015] [Indexed: 06/05/2023]
Abstract
Monoterpenes, source of the distinctive odor of conifers, are generally considered plant defensive compounds. However, they are also known to act as long-range insect attractants, as they are volatile and permeate forest airspaces. Moreover, they are lipid soluble and can be absorbed into plant epicuticular waxes. We test their role in short-range host plant choice by both adult females and larvae of a folivorous forest pest (Choristoneura fumiferana). We conducted laboratory assays testing the responses of Eastern spruce budworm to an artificial monoterpene mix (α-pinene, β-pinene, limonene, myrcene) and to white spruce (Picea glauca) epicuticular waxes in closed arenas. Ovipositing females preferred filter paper discs treated with P. glauca waxes to controls, and preferred the waxes + monoterpenes treatment to waxes alone. However, females showed no preference between the monoterpene-treated disc and the control when presented without waxes. Feeding larvae prefered wax discs to control discs. They also consumed discs treated with realistic monoterpene concentrations and wax preferentially over wax-only discs, but showed no preference between extremely high monoterpene concentrations and wax-only controls. In an insect-free assay, P. glauca epicuticular wax decreased monoterpene volatilization. These results suggest that P. glauca waxes and realistic concentrations of monoterpenes are stimulatory to both egg-laying females and feeding larvae, and that their effects are synergistic.
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Affiliation(s)
| | | | - Fei Chen
- Department of Chemistry and Biochemistry, Concordia University, Montreal, H4B 1R6
| | - Pat Forgione
- Department of Chemistry and Biochemistry, Concordia University, Montreal, H4B 1R6
| | - Eric Bauce
- Département des Sciences du bois et de la forêt, Université Laval, Québec City, Quebec, Canada
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de Souza FR, Guimarães AP, Cuya T, de Freitas MP, Gonçalves ADS, Forgione P, Costa França TC. Analysis of Coxiela burnetti dihydrofolate reductase via in silico docking with inhibitors and molecular dynamics simulation. J Biomol Struct Dyn 2016; 35:2975-2986. [PMID: 27726597 DOI: 10.1080/07391102.2016.1239550] [Citation(s) in RCA: 8] [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] [Indexed: 02/02/2023]
Abstract
Coxiella burnetii is a gram-negative bacterium able to infect several eukaryotic cells, mainly monocytes and macrophages. It is found widely in nature with ticks, birds, and mammals as major hosts. C. burnetii is also the biological warfare agent that causes Q fever, a disease that has no vaccine or proven chemotherapy available. Considering the current geopolitical context, this fact reinforces the need for discovering new treatments and molecular targets for drug design against C. burnetii. Among the main molecular targets against bacterial diseases reported, the enzyme dihydrofolate reductase (DHFR) has been investigated for several infectious diseases. In the present work, we applied molecular modeling techniques to evaluate the interactions of known DHFR inhibitors in the active sites of human and C. burnetii DHFR (HssDHFR and CbDHFR) in order to investigate their potential as selective inhibitors of CbDHFR. Results showed that most of the ligands studied compete for the binding site of the substrate more effectively than the reference drug trimethoprim. Also the most promising compounds were proposed as leads for the drug design of potential CbDHFR inhibitors.
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Affiliation(s)
- Felipe Rodrigues de Souza
- a Laboratory of Molecular Modeling Applied to Chemical and Biological Defense (LMCBD) , Military Institute of Engineering , Rio de Janeiro , RJ , Brazil
| | - Ana Paula Guimarães
- b Department of Chemistry , Federal University of Viçosa , Viçosa , MG , Brazil
| | - Teobaldo Cuya
- c Faculty of Technology , University of the State of Rio de Janeiro , Resende , RJ , Brazil
| | | | | | - Pat Forgione
- f Department of Chemistry and Biochemistry , Concordia University , Montreal , Canada
| | - Tanos Celmar Costa França
- a Laboratory of Molecular Modeling Applied to Chemical and Biological Defense (LMCBD) , Military Institute of Engineering , Rio de Janeiro , RJ , Brazil.,f Department of Chemistry and Biochemistry , Concordia University , Montreal , Canada.,g Faculty of Management and Informatics , University Hradec Kralove , Hradec Kralove , Czech Republic
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20
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Jaunky DB, Forgione P, Piekny A. Abstract 3808: Novel compound conferring selectivity for cancer cells. Cancer Res 2016. [DOI: 10.1158/1538-7445.am2016-3808] [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
Abstract
There is a need to develop novel compounds that can effectively treat a broad range of cancers on their own, or in combination with approved therapies. As personalized medicine is developed, combinatorial approaches will become more common making it crucial to increase the repertoire of available drugs. In the past, drugs often were developed to target a biologically-relevant molecule, but structural limitations, stability and solubility issues, or lack of selectivity have hindered the clinical use of many of these drugs. Our approach was to first find a ‘high-quality’ compound that is selective for cancer cells, then characterize its mechanism of action and identify its target. High throughput screening (HTS) helped to rapidly identify a subset of compounds with selective toxicity toward MCF-7 (breast cancer) cells. Some of these compounds were further tested for their efficacy in HeLa (cervical cancer) cells, and we found one that selectively causes mitotic arrest at 250 nM in comparison to non-cancerous HFF-1 (foreskin fibroblast) cells. At 200 nM, this compound synergizes with drugs known to affect microtubule dynamics and cause mitotic arrest including Nocodazole and Paclitaxel (currently in use as an anti-cancer drug), causing them to be more effective at lower concentrations. Excitingly, this compound also provides a shielding effect for HFF-1 cells treated with Paclitaxel. To learn the mechanism of action for this compound, we performed immunofluorescence microscopy on HeLa and HFF-1 cells treated with a range of concentrations. We found that the mitotic spindle is improperly organized in HeLa cells at 250 nM, but not in HFF-1 cells. Interestingly, microtubules are completely gone in mitotic HeLa cells and are reduced in mitotic HFF-1 cells treated with >500 nM. Given that this compound synergizes with drugs that directly bind to tubulin subunits to modify their dynamics of assembly and disassembly, and differently affects cancerous vs. healthy cells, we hypothesize that it has a unique mechanism of action and may affect microtubule nucleation. We are continuing to characterize the compound, and will identify its molecular target. In addition, we are generating further iterations to explore the Structure-Activity Relationship, and optimize its efficacy. Our in vitro data shows that our approach has the potential to identify novel compounds with the potential for therapeutic use.
Citation Format: Dilan B. Jaunky, Pat Forgione, Alisa Piekny. Novel compound conferring selectivity for cancer cells. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 3808.
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21
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Bastos LDC, de Souza FR, Guimarães AP, Sirouspour M, Cuya Guizado TR, Forgione P, Ramalho TC, França TCC. Virtual screening, docking, and dynamics of potential new inhibitors of dihydrofolate reductase from Yersinia pestis. J Biomol Struct Dyn 2016; 34:2184-98. [DOI: 10.1080/07391102.2015.1110832] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Leonardo da Costa Bastos
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ 22290-270, Brazil
| | - Felipe Rodrigues de Souza
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ 22290-270, Brazil
| | - Ana Paula Guimarães
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ 22290-270, Brazil
- Department of Chemistry, Federal University of Viçosa, Viçosa, MG 36570-000 Brazil
| | - Mehdi Sirouspour
- Department of Chemistry & Biochemistry, Concordia University, Montreal, QC, Canada
| | - Teobaldo Ricardo Cuya Guizado
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ 22290-270, Brazil
- Faculty of Technology, University of the State of Rio de Janeiro, Resende, RJ 27.537-000, Brazil
| | - Pat Forgione
- Department of Chemistry & Biochemistry, Concordia University, Montreal, QC, Canada
| | - Teodorico Castro Ramalho
- Laboratory of Molecular Modeling, Chemistry Department, Federal University of Lavras, Lavras, MG, Brazil
- Faculty of Informatics and Management, Center for Basic and Applied Research, University of Hradec Kralove, Hradec Kralove, Czech Republic
| | - Tanos Celmar Costa França
- Laboratory of Molecular Modeling Applied to the Chemical and Biological Defense (LMCBD), Military Institute of Engineering, Rio de Janeiro, RJ 22290-270, Brazil
- Department of Chemistry & Biochemistry, Concordia University, Montreal, QC, Canada
- Faculty of Informatics and Management, Center for Basic and Applied Research, University of Hradec Kralove, Hradec Kralove, Czech Republic
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22
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Ortgies DH, Hassanpour A, Chen F, Woo S, Forgione P. Desulfination as an Emerging Strategy in Palladium-Catalyzed C-C Coupling Reactions. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501231] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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23
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Forgione P, Mangel D, Buonomano C, Sévigny S, Di Censo G, Thevendran G. Efficient Desulfinative Cross-Coupling of Heteroaromatic Sulfinates with Aryl Triflate in Environmentally Friendly Protic Solvents. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Yu Q, Rodriguez EM, Naccache R, Forgione P, Lamoureux G, Sanz-Rodriguez F, Scheglmann D, Capobianco JA. Chemical modification of temoporfin – a second generation photosensitizer activated using upconverting nanoparticles for singlet oxygen generation. Chem Commun (Camb) 2014; 50:12150-3. [DOI: 10.1039/c4cc05867d] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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25
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26
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Rajasingam A, Schmidt R, Woo S, DeWolf C, Forgione P. Efficient Preparation of Novel Phenolic Surfactants for Self-Assembled Monolayers. SYNTHETIC COMMUN 2014. [DOI: 10.1080/00397911.2013.844259] [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: 10/26/2022]
Affiliation(s)
- Arison Rajasingam
- a Department of Chemistry and Biochemistry , Centre for NanoScience Research, Concordia University , Montreal , Canada
| | - Rolf Schmidt
- a Department of Chemistry and Biochemistry , Centre for NanoScience Research, Concordia University , Montreal , Canada
| | - Simon Woo
- a Department of Chemistry and Biochemistry , Centre for NanoScience Research, Concordia University , Montreal , Canada
| | - Christine DeWolf
- a Department of Chemistry and Biochemistry , Centre for NanoScience Research, Concordia University , Montreal , Canada
| | - Pat Forgione
- a Department of Chemistry and Biochemistry , Centre for NanoScience Research, Concordia University , Montreal , Canada
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27
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Chen F, Wong NWY, Forgione P. One-Pot Tandem Palladium-Catalyzed Decarboxylative Cross-Coupling and CH Activation Route to Thienoisoquinolines. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201300924] [Citation(s) in RCA: 14] [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] [Indexed: 12/12/2022]
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28
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Hassanpour A, De Carufel CA, Bourgault S, Forgione P. Synthesis of 2,5-diaryl-substituted thiophenes as helical mimetics: towards the modulation of islet amyloid polypeptide (IAPP) amyloid fibril formation and cytotoxicity. Chemistry 2014; 20:2522-8. [PMID: 24488624 DOI: 10.1002/chem.201303928] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Indexed: 11/08/2022]
Abstract
A range of 2,5-diarylated thiophenes were synthesised as small molecule mimetics of the α-helix to modulate the amyloidogenesis and cytotoxic effect of islet amyloid polypeptide (IAPP). 3-Substituted thiophene-2-carboxylic acids were used as key intermediates and functionalised by palladium decarboxylative cross-coupling and direct C-H activation successively with overall yields ranging from 23 to 95 %. The effect of the ligands on IAPP amyloid fibril formation was evaluated with the thioflavin T (ThT) fluorescence-based assay. Furthermore, the capacity of these compounds to inhibit the cytotoxic effect of IAPP was assessed using β-pancreatic cells.
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Affiliation(s)
- Avid Hassanpour
- Concordia University, Department of Chemistry and Biochemistry, Pharmaqam, 7141 rue Sherbrooke O., Montréal, QC H4B 1R6 (Canada)
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LaPlante SR, Forgione P, Boucher C, Coulombe R, Gillard J, Hucke O, Jakalian A, Joly MA, Kukolj G, Lemke C, McCollum R, Titolo S, Beaulieu PL, Stammers T. Enantiomeric Atropisomers Inhibit HCV Polymerase and/or HIV Matrix: Characterizing Hindered Bond Rotations and Target Selectivity. J Med Chem 2013; 57:1944-51. [DOI: 10.1021/jm401202a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Steven R. LaPlante
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Pat Forgione
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Colette Boucher
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - René Coulombe
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - James Gillard
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Oliver Hucke
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Araz Jakalian
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Marc-André Joly
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - George Kukolj
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Christopher Lemke
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Robert McCollum
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Steve Titolo
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Pierre L. Beaulieu
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
| | - Timothy Stammers
- Departments of Chemistry and Biological
Sciences, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, , Quebec H7S 2G5, Canada
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Affiliation(s)
- Pat Forgione
- Concordia University, Department of Chemistry and Biochemistry
| | - Dirk Ortgies
- Concordia University, Department of Chemistry and Biochemistry
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31
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Bilodeau F, Bailey MD, Bhardwaj PK, Bordeleau J, Forgione P, Garneau M, Ghiro E, Gorys V, Halmos T, Jolicoeur ES, Leblanc M, Lemke CT, Naud J, O’Meara J, White PW, Llinàs-Brunet M. Synthesis and optimization of a novel series of HCV NS3 protease inhibitors: 4-Arylproline analogs. Bioorg Med Chem Lett 2013; 23:4267-71. [DOI: 10.1016/j.bmcl.2013.03.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2013] [Revised: 03/08/2013] [Accepted: 03/12/2013] [Indexed: 10/27/2022]
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Forgione P, Ortgies D, Barthelme A, Aly S, Desharnais B, Rioux S. Scope of the Desulfinylative Palladium-Catalyzed Cross-Coupling of Aryl Sulfinates with Aryl Bromides. SYNTHESIS-STUTTGART 2013. [DOI: 10.1055/s-0032-1318151] [Citation(s) in RCA: 24] [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] [Indexed: 10/27/2022]
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Sévigny S, Forgione P. Palladium-catalyzed intermolecular desulfinylative cross-coupling of heteroaromatic sulfinates. Chemistry 2013; 19:2256-60. [PMID: 23292823 DOI: 10.1002/chem.201204201] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Indexed: 12/21/2022]
Abstract
Beauty lies in simplicity: An efficient and environmentally benign palladium-catalyzed protocol has been developed using a sulfinate as a nucleophilic coupling partner. The sulfinate position is arylated chemoselectively in very good yields. The bench-stable, non-hygroscopic heteroaromatic sulfinate salts rapidly undergo cross-coupling without the need of a co-catalyst, base, or additives (see scheme; mw = microwave).
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Affiliation(s)
- Stéphane Sévigny
- Chemistry and Biochemistry, Concordia University, 7141 rue Sherbrooke O. Montréal, QC, H4B 1R6, Canada
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Sévigny S, Forgione P. Efficient desulfinylative cross-coupling of thiophene and furan sulfinates with aryl bromides in aqueous media. NEW J CHEM 2013. [DOI: 10.1039/c3nj41153b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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35
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Wong NWY, Forgione P. A One-Pot Double C–H Activation Palladium Catalyzed Route to a Unique Class of Highly Functionalized Thienoisoquinolines. Org Lett 2012; 14:2738-41. [DOI: 10.1021/ol3009655] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Nicholas W. Y. Wong
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O. H4B 1R6, Montréal, QC, Canada and Centre for Green Chemistry & Catalysis, Montréal, QC, Canada
| | - Pat Forgione
- Department of Chemistry & Biochemistry, Concordia University, 7141 rue Sherbrooke O. H4B 1R6, Montréal, QC, Canada and Centre for Green Chemistry & Catalysis, Montréal, QC, Canada
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36
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Llinàs-Brunet M, Bailey MD, Goudreau N, Bhardwaj PK, Bordeleau J, Bös M, Bousquet Y, Cordingley MG, Duan J, Forgione P, Garneau M, Ghiro E, Gorys V, Goulet S, Halmos T, Kawai SH, Naud J, Poupart MA, White PW. Discovery of a Potent and Selective Noncovalent Linear Inhibitor of the Hepatitis C Virus NS3 Protease (BI 201335). J Med Chem 2010; 53:6466-76. [DOI: 10.1021/jm100690x] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Montse Llinàs-Brunet
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Murray D. Bailey
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Nathalie Goudreau
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Punit K. Bhardwaj
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Josée Bordeleau
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Michael Bös
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Yves Bousquet
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Michael G. Cordingley
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Jiamin Duan
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Pat Forgione
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Michel Garneau
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Elise Ghiro
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Vida Gorys
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Sylvie Goulet
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Ted Halmos
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Stephen H. Kawai
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Julie Naud
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Marc-André Poupart
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
| | - Peter W. White
- Departments of Medicinal Chemistry, and Biological Sciences, Research and Development, Boehringer Ingelheim (Canada) Ltd., 2100 Cunard Street, Laval, Quebec H7S 2G5, Canada
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37
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Bilodeau F, Brochu MC, Guimond N, Thesen KH, Forgione P. Palladium-Catalyzed Decarboxylative Cross-Coupling Reaction Between Heteroaromatic Carboxylic Acids and Aryl Halides. J Org Chem 2010; 75:1550-60. [DOI: 10.1021/jo9022793] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [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)
- François Bilodeau
- Boehringer Ingelheim (Canada) Ltd. Research and Development, 2100 rue Cunard, Laval (Québec), Canada H7S 2G5
| | - Marie-Christine Brochu
- Boehringer Ingelheim (Canada) Ltd. Research and Development, 2100 rue Cunard, Laval (Québec), Canada H7S 2G5
| | - Nicolas Guimond
- Boehringer Ingelheim (Canada) Ltd. Research and Development, 2100 rue Cunard, Laval (Québec), Canada H7S 2G5
| | - Kris H. Thesen
- Boehringer Ingelheim (Canada) Ltd. Research and Development, 2100 rue Cunard, Laval (Québec), Canada H7S 2G5
| | - Pat Forgione
- Boehringer Ingelheim (Canada) Ltd. Research and Development, 2100 rue Cunard, Laval (Québec), Canada H7S 2G5
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38
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James CA, Coelho AL, Gevaert M, Forgione P, Snieckus V. Combined directed ortho and remote metalation-Suzuki cross-coupling strategies. Efficient synthesis of heteroaryl-fused benzopyranones from biaryl O-carbamates. J Org Chem 2009; 74:4094-103. [PMID: 19441801 DOI: 10.1021/jo900146d] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise synthesis of heteroaryl dibenzopyranones 9a,b, 10a,b, 11a-c, and 12a-c has been achieved by the LDA-induced migration of heterobiaryl O-carbamates 18, 21, 25, and 30 which, in turn, were prepared in good yield using a combined directed ortho lithiation (DoM)-transition-metal-catalyzed Suzuki cross-coupling strategy. An efficient and general route to a wide variety of heterocycles including coumestans 19a,c and the previously unknown isothiocoumestan ring system 22b has been thereby achieved.
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Affiliation(s)
- Clint A James
- Department of Chemistry, University of Waterloo, Waterloo, ON, Canada N2L 3G1
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Kawai S, Bailey M, Halmos T, Forgione P, LaPlante S, Llinàs-Brunet M, Naud J, Goudreau N. The Use of Chemical Double-Mutant Cycles in Biomolecular Recognition Studies: Application to HCV NS3 Protease Inhibitors. ChemMedChem 2008; 3:1654-7. [DOI: 10.1002/cmdc.200800214] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [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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Naud J, Lemke C, Goudreau N, Beaulieu E, White PD, Llinàs-Brunet M, Forgione P. Potent triazolyl-proline-based inhibitors of HCV NS3 protease. Bioorg Med Chem Lett 2008; 18:3400-4. [DOI: 10.1016/j.bmcl.2008.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2008] [Revised: 04/03/2008] [Accepted: 04/07/2008] [Indexed: 10/22/2022]
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41
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Ciblat S, Kim J, Stewart CA, Wang J, Forgione P, Clyne D, Paquette LA. A modular approach to marine macrolide construction. 4. Assembly of C36-C51 and C29-C44 building blocks and evaluation of key coupling reactions targeting spongistatin 1 (altohyrtin A). Org Lett 2007; 9:719-22. [PMID: 17286379 DOI: 10.1021/ol063083i] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Routes have been developed for the stereocontrolled elaboration of two highly functionalized sectors of spongistatin 1. The approach to ring F takes advantage of B-alkyl Suzuki-Miyaura coupling to install the C44-C45 bond. The E-ring pyran moiety was generated by acylation of an alpha-sulfonyl carbanion, the stereogenic centers of which were incorporated by sequential asymmetric aldol reactions. [structure: see text].
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Affiliation(s)
- Stephane Ciblat
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA
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42
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Forgione P, Brochu MC, St-Onge M, Thesen KH, Bailey MD, Bilodeau F. Unexpected Intermolecular Pd-Catalyzed Cross-Coupling Reaction Employing Heteroaromatic Carboxylic Acids as Coupling Partners. J Am Chem Soc 2006; 128:11350-1. [PMID: 16939247 DOI: 10.1021/ja063511f] [Citation(s) in RCA: 347] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Aryl-substituted five-membered heteroaromatics have attracted great interest over the past years due to their presence in a large number of pharmaceuticals and natural products. Recently, an advance in the preparation of these scaffolds was achieved by employing a C-H functionalization strategy. This method allows easy access to these biaryl motifs by precluding the necessity of preparing specific coupling partners, although poor regioselectivity is sometimes observed when more than one reactive C-H is present on the substrate. In an effort to circumvent this liability, we envisioned the use of a carboxylic acid moiety as a blocking group that could be later functionalized or removed. Remarkably, the coupling was found to occur exclusively at the position previously occupied by the acid, even in the presence of a reactive C-H group. This selective transformation was also found to proceed with other heteroaromatic carboxylic acids, allowing for the preparation of a variety of aryl-substituted heteroaromatics that would be difficult to obtain via other methods.
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Affiliation(s)
- Pat Forgione
- Boehringer Ingelheim (Canada), Limited, Research and Development, 2100 rue Cunard, Laval, Quebec, Canada, H7S 2G5.
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Laurent A, Villalva-Servín NP, Forgione P, Wilson PD, Smil DV, Fallis AG. Part 1: Efficient strategies for the construction of variably substituted bicyclo[5.3.1]undecenones (AB taxane ring systems). CAN J CHEM 2004. [DOI: 10.1139/v03-200] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Strategies for the construction of cyclic molecules containing variably substituted bicyclo[5.3.1]undecenones (AB taxane ring systems) are described. These routes employ a multi-component coupling protocol that utilizes sequential magnesium-mediated carbometallation of propargyl alcohols and intramolecular DielsAlder reactions (IMDA). The cycloaddition generates the key eight-membered taxane ring as a single diastereomer, induced by preferential Lewis acid (diethylaluminum chloride or boron trifluoride etherate) complexation with the cross-ring oxygens. Both the electronic nature of the dienophile and the neighbouring group non-bonded interactions contribute to the success of these cycloadditions.Key words: magnesium chelate, Lewis acid, intramolecular DielsAlder, cycloaddition.
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Forgione P, Nunzi E, Cavalchini A, Clapasson A, Piccirillo F, Langella M, Raimondo U, Vendemmia S. [Scrofuloderma. a clinical case]. Minerva Pediatr 2004; 56:119-22. [PMID: 15249922] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
Scrofuloderma is a form of colliquative cutaneous tuberculosis resulting from the spread of an underlying focus, generally represented by lymphnodes; osteoarticular tubercular locations or epididimus locations can also lead to ulcerative cutaneous involvement. We report the case of a female patient aged 12 who had been in Italy for 15 days following her arrival from Marocco. In the left clavicular region she presented an ulcerated lesion with palpable lymphnodes on the corresponding side of the neck. Histopathological examination of one of the involved lymphnodes suggested a mycobacteriosis; differential diagnosis was carried out between MAIS (M. avium, M. intracellulare, M. scrofulaceum) group mycobacteria infection and tuberculosis. Bacteriological research in the lymphnode of alcohol-acid resistant bacilli gave a negative result, while cultural examination and protein chain reaction pointed to M. tuberculosis. The patient was subjected to combined treatment based on rifampycin, isoniazide, etambutolol and pyrazinamide. At the present time, tuberculosis is an important public health problem in developing countries. In western countries such as the United Kingdom, which have been open to immigration for a longer time, scrofuloderma is present with higher prevalence in immigrants from Asia and Africa; in these immigrant populations, this tubercular form involves a wide age segment between the ages of 10 and 50. In the autochthonous population the highest incidence is in subjects aged more than 50. In Italy too, extra-communitary immigration has also contributed, with a delay compared to other western countries, to bring tuberculosis back into the public eye after a period of decades during which it was wrongly considered to have disappeared.
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Affiliation(s)
- P Forgione
- Clinica Pineta Grande, Castel Volturno (Caserta), Italy
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Fernandez N, Lounsbury K, Osler T, Corrow K, Healey C, Forgione P, Stanley A. Pressure induced cellular senescence-a possible mechanism linking venous hypertension to venous ulcers. J Surg Res 2003. [DOI: 10.1016/j.jss.2003.08.208] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Melekhov A, Forgione P, Legoupy S, Fallis AG. Tether-controlled cycloadditions for the asymmetric synthesis of decalins: increased selectivity in acetonitrile solvent. Org Lett 2000; 2:2793-6. [PMID: 10964367 DOI: 10.1021/ol0062042] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] The beneficial influence of cis-isopropylidene acetal tether control groups, to facilitate the asymmetric synthesis of substituted decalins by intramolecular Diels-Alder reactions, is described. Compared to trans-acetonides, these cases proceed under milder conditions to afford the cis-fused adducts from an endo transition state. An unusual acetonitrile solvent effect exerts a dramatic influence on the diastereoselectivity. This strategy leads to the chiral nonracemic bicyclo[4.4.0]decane core of diverse natural products.
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Affiliation(s)
- A Melekhov
- Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, Canada K1N 6N5
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Saban M, Liebermann G, Jay A, Shi AC, Ro N, Dale W, Forgione P. Piloting of anionic polymerization of styrene in tetrahydrofurant. CAN J CHEM ENG 2000. [DOI: 10.1002/cjce.5450780206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Forgione P, Wilson PD, Yap GPA, Fallis AG. A Carbometallation-Intramolecular Cycloaddition Strategy for the AB-Taxane Ring and an Enone Accelerated Cope Rearrangement to Bicyclo[2.2.2]octanones. SYNTHESIS-STUTTGART 2000. [DOI: 10.1055/s-2000-6291] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Forgione P, Fallis AG. Magnesium mediated carbometallation of propargyl alcohols: direct routes to dihydroxydienes and enediyne alcohols. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(99)01994-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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