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Cruz DA, Sinka V, de Armas P, Steingruber HS, Fernández I, Martín VS, Miranda PO, Padrón JI. Iron(II) and Copper(I) Control the Total Regioselectivity in the Hydrobromination of Alkenes. Org Lett 2021; 23:6105-6109. [PMID: 34318671 PMCID: PMC8397429 DOI: 10.1021/acs.orglett.1c02186] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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] [Indexed: 11/28/2022]
Abstract
![]()
A new method that
allows the complete control of the regioselectivity
of the hydrobromination reaction of alkenes is described. Herein,
we report a radical procedure with TMSBr and oxygen as common reagents,
where the formation of the anti-Markovnikov product
occurs in the presence of parts per million amounts of the Cu(I) species
and the formation of the Markovnikov product occurs in the presence
of 30 mol % iron(II) bromide. Density functional theory calculations
combined with Fukui’s radical susceptibilities support the
obtained results.
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Affiliation(s)
- Daniel A Cruz
- "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica, Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), Universidad de La Laguna, Avenida Francisco Sánchez 2, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Victoria Sinka
- Molecular Sciences Department, Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC), Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Pedro de Armas
- Molecular Sciences Department, Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC), Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Hugo Sebastian Steingruber
- "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica, Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), Universidad de La Laguna, Avenida Francisco Sánchez 2, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Israel Fernández
- Departamento de Química Orgánica I y Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Víctor S Martín
- "Síntesis Orgánica Sostenible, Unidad Asociada al CSIC", Departamento de Química Orgánica, Instituto Universitario de Bio-Orgánica "Antonio González" (CIBICAN), Universidad de La Laguna, Avenida Francisco Sánchez 2, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Pedro O Miranda
- Molecular Sciences Department, Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC), Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Islas Canarias, Spain
| | - Juan I Padrón
- Molecular Sciences Department, Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (IPNA-CSIC), Avenida Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Islas Canarias, Spain
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2
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Jacob NT, Miranda PO, Shirey RJ, Gautam R, Zhou B, de Orbe Izquierdo ME, Hixon MS, Hart JR, Ueno L, Vogt PK, Janda KD. Synthetic molecules for disruption of the MYC protein-protein interface. Bioorg Med Chem 2018; 26:4234-4239. [PMID: 30037753 DOI: 10.1016/j.bmc.2018.07.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/03/2018] [Accepted: 07/10/2018] [Indexed: 01/23/2023]
Abstract
MYC is a key transcriptional regulator involved in cellular proliferation and has established roles in transcriptional elongation and initiation, microRNA regulation, apoptosis, and pluripotency. Despite this prevalence, functional chemical probes of MYC function at the protein level have been limited. Previously, we discovered 5a, that binds to MYC with potency and specificity, downregulates the transcriptional activities of MYC and shows efficacy in vivo. However, this scaffold posed intrinsic pharmacokinetic liabilities, namely, poor solubility that precluded biophysical interrogation. Here, we developed a screening platform based on field-effect transistor analysis (Bio-FET), surface plasmon resonance (SPR), and a microtumor formation assay to analyze a series of new compounds aimed at improving these properties. This blind SAR campaign has produced a new lead compound of significantly increased in vivo stability and solubility for a 40-fold increase in exposure. This probe represents a significant advancement that will not only enable biophysical characterization of this interaction and further SAR, but also contribute to advances in understanding of MYC biology.
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Affiliation(s)
- Nicholas T Jacob
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Pedro O Miranda
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Ryan J Shirey
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Ritika Gautam
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Bin Zhou
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - M Elena de Orbe Izquierdo
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Mark S Hixon
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Jonathan R Hart
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Lynn Ueno
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Peter K Vogt
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Kim D Janda
- Department of Chemistry, BCC-582, 10550 N Torrey Pines Road, The Scripps Research Institute, La Jolla, CA 92037, United States.
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Tararina MA, Xue S, Smith LC, Muellers SN, Miranda PO, Janda KD, Allen KN. Crystallography Coupled with Kinetic Analysis Provides Mechanistic Underpinnings of a Nicotine-Degrading Enzyme. Biochemistry 2018; 57:3741-3751. [PMID: 29812904 PMCID: PMC6295333 DOI: 10.1021/acs.biochem.8b00384] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Nicotine oxidoreductase (NicA2) is a bacterial flavoenzyme, which catalyzes the first step of nicotine catabolism by oxidizing S-nicotine into N-methyl-myosmine. It has been proposed as a biotherapeutic for nicotine addiction because of its nanomolar substrate binding affinity. The first crystal structure of NicA2 has been reported, establishing NicA2 as a member of the monoamine oxidase (MAO) family. However, substrate specificity and structural determinants of substrate binding and/or catalysis have not been explored. Herein, analysis of the pH-rate profile, single-turnover kinetics, and binding data establish that pH does not significantly affect the catalytic rate and product release is not rate-limiting. The X-ray crystal structure of NicA2 with S-nicotine refined to 2.65 Å resolution reveals a hydrophobic binding site with a solvent exclusive cavity. Hydrophobic interactions predominantly orient the substrate, promoting the binding of a deprotonated species and supporting a hydride-transfer mechanism. Notably, NicA2 showed no activity against neurotransmitters oxidized by the two isoforms of human MAO. To further probe the substrate range of NicA2, enzyme activity was evaluated using a series of substrate analogues, indicating that S-nicotine is the optimal substrate and substitutions within the pyridyl ring abolish NicA2 activity. Moreover, mutagenesis and kinetic analysis of active-site residues reveal that removal of a hydrogen bond between the pyridyl ring of S-nicotine and the hydroxyl group of T381 has a 10-fold effect on KM, supporting the role of this bond in positioning the catalytically competent form of the substrate. Together, crystallography combined with kinetic analysis provides a deeper understanding of this enzyme's remarkable specificity.
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Affiliation(s)
- Margarita A. Tararina
- Program in Biomolecular Pharmacology, Boston University School of Medicine, 72 East Concord Street, Boston, Massachusetts 02118, United States
| | - Song Xue
- Departments of Chemistry and Immunology and The Skaggs Institute for Chemical Biology
| | - Lauren C. Smith
- Departments of Chemistry and Immunology and The Skaggs Institute for Chemical Biology
| | - Samantha N. Muellers
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Pedro O. Miranda
- Departments of Chemistry and Immunology and The Skaggs Institute for Chemical Biology
| | - Kim D. Janda
- Departments of Chemistry and Immunology and The Skaggs Institute for Chemical Biology
- Worm Institute for Medical Research (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, BCC-582, La Jolla, California 92037, United States
| | - Karen N. Allen
- Program in Biomolecular Pharmacology, Boston University School of Medicine, 72 East Concord Street, Boston, Massachusetts 02118, United States
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
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4
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Abstract
Several arenaviruses cause hemorrhagic fever (HF) disease in humans and represent important public health problems in their endemic regions. In addition, evidence indicates that the worldwide-distributed prototypic arenavirus lymphocytic choriomeningitis virus is a neglected human pathogen of clinical significance. There are no licensed arenavirus vaccines, and current antiarenavirus therapy is limited to an off-label use of ribavirin that is only partially effective. Therefore, there is an unmet need for novel therapeutics to combat human pathogenic arenaviruses, a task that will be facilitated by the identification of compounds with antiarenaviral activity that could serve as probes to identify arenavirus-host interactions suitable for targeting, as well as lead compounds to develop future antiarenaviral drugs. Screening of a combinatorial library of Krönhke pyridines identified compound KP-146 [(5-(5-(2,3-dihydrobenzo[ b][1,4] dioxin-6-yl)-4'-methoxy-[1,1'-biphenyl]-3-yl)thiophene-2-carboxamide] as having strong anti-lymphocytic choriomeningitis virus (LCMV) activity in cultured cells. KP-146 did not inhibit LCMV cell entry but rather interfered with the activity of the LCMV ribonucleoprotein (vRNP) responsible for directing virus RNA replication and gene transcription, as well as with the budding process mediated by the LCMV matrix Z protein. LCMV variants with increased resistance to KP-146 did not emerge after serial passages in the presence of KP-146. Our findings support the consideration of Kröhnke pyridine scaffold as a valuable source to identify compounds that could serve as tools to dissect arenavirus-host interactions, as well as lead candidate structures to develop antiarenaviral drugs.
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5
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Abstract
A nicotine-degrading enzyme termed NicA2 was altered (NicA2-J1) through fusion of an albumin binding domain to increase its half-life. Examination of NicA2-J1 in vivo demonstrated a complete blockade of brain nicotine access, which in turn blunted nicotine's psychoactive effects. These data further support development of pharmacokinetic nicotine cessation therapeutics.
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Affiliation(s)
- Song Xue
- Departments of Chemistry, Immunology, Microbiology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
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6
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Scoccia J, Pérez SJ, Sinka V, Cruz DA, López-Soria JM, Fernández I, Martín VS, Miranda PO, Padrón JI. Direct Access to 2,3,4,6-Tetrasubstituted Tetrahydro-2H-pyrans via Tandem SN2′–Prins Cyclization. Org Lett 2017; 19:4834-4837. [DOI: 10.1021/acs.orglett.7b02270] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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)
- Jimena Scoccia
- Departamento
de Química, Universidad Nacional del Sur, Av Alem 1253, 800 Bahía Blanca, Argentina
- INQUISUR, CONICET, Av Alem 1253, 800 Bahía Blanca, Argentina
| | - Sixto J. Pérez
- Instituto
Universitario de Bio-Orgánica “Antonio González”
(CIBICAN), “Síntesis Orgánica Sostenible, Unidad
Asociada al CSIC”, Departamento de Química Orgánica, Universidad de La Laguna, Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Victoria Sinka
- Instituto de Productos Naturales y Agrobiología, CSIC, Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Daniel A. Cruz
- Instituto
Universitario de Bio-Orgánica “Antonio González”
(CIBICAN), “Síntesis Orgánica Sostenible, Unidad
Asociada al CSIC”, Departamento de Química Orgánica, Universidad de La Laguna, Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Juan M. López-Soria
- Instituto de Productos Naturales y Agrobiología, CSIC, Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Israel Fernández
- Departamento
de Química Orgánica I, Facultad de Ciencias Químicas, Centro de Innovación en Química Avanzada (ORFEO−CINQA), Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Víctor S. Martín
- Instituto
Universitario de Bio-Orgánica “Antonio González”
(CIBICAN), “Síntesis Orgánica Sostenible, Unidad
Asociada al CSIC”, Departamento de Química Orgánica, Universidad de La Laguna, Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
| | - Pedro O. Miranda
- Instituto de Productos Naturales y Agrobiología, CSIC, Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Juan I. Padrón
- Instituto de Productos Naturales y Agrobiología, CSIC, Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
- Instituto
Universitario de Bio-Orgánica “Antonio González”
(CIBICAN), “Síntesis Orgánica Sostenible, Unidad
Asociada al CSIC”, Departamento de Química Orgánica, Universidad de La Laguna, Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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Gooyit M, Miranda PO, Wenthur CJ, Ducime A, Janda KD. Influencing Antibody-Mediated Attenuation of Methamphetamine CNS Distribution through Vaccine Linker Design. ACS Chem Neurosci 2017; 8:468-472. [PMID: 27958709 DOI: 10.1021/acschemneuro.6b00389] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Active vaccination examining a single hapten engendered with a series of peptidic linkers has resulted in the production of antimethamphetamine antibodies. Given the limited chemical complexity of methamphetamine, the structure of the linker species embedded within the hapten could have a substantial effect on the ultimate efficacy of the resulting vaccines. Herein, we investigate linker effects by generating a series of methamphetamine haptens that harbor a linker with varying amino acid identity, peptide length, and associated carrier protein. Independent changes in each of these parameters were found to result in alterations in both the quantity and quality of the antibodies induced by vaccination. Although it was found that the consequence of the linker design was also dependent on the identity of the carrier protein, we demonstrate overall that the inclusion of a short, structurally simple, amino acid linker benefits the efficacy of a methamphetamine vaccine in limiting brain penetration of the free drug.
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Affiliation(s)
- Major Gooyit
- Departments of Chemistry and Immunology
and Microbial Science, The Skaggs Institute for Chemical Biology,
and The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Pedro O. Miranda
- Departments of Chemistry and Immunology
and Microbial Science, The Skaggs Institute for Chemical Biology,
and The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Cody J. Wenthur
- Departments of Chemistry and Immunology
and Microbial Science, The Skaggs Institute for Chemical Biology,
and The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Alex Ducime
- Departments of Chemistry and Immunology
and Microbial Science, The Skaggs Institute for Chemical Biology,
and The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Kim D. Janda
- Departments of Chemistry and Immunology
and Microbial Science, The Skaggs Institute for Chemical Biology,
and The Worm Institute for Research and Medicine (WIRM), The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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8
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Pérez SJ, Purino M, Miranda PO, Martín VS, Fernández I, Padrón JI. Back Cover: Prins Cyclization Catalyzed by a Fe
III
/Trimethylsilyl Halide System: The Oxocarbenium Ion Pathway versus the [2+2] Cycloaddition (Chem. Eur. J. 43/2015). Chemistry 2015. [DOI: 10.1002/chem.201584304] [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: 11/10/2022]
Affiliation(s)
- Sixto J. Pérez
- Instituto Universitario de Bio‐Orgánica “Antonio González”, Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Martín Purino
- Instituto Universitario de Bio‐Orgánica “Antonio González”, Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Pedro O. Miranda
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135
| | - Víctor S. Martín
- Instituto Universitario de Bio‐Orgánica “Antonio González”, Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid (Spain)
| | - Juan I. Padrón
- Instituto Universitario de Bio‐Orgánica “Antonio González”, Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135
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9
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Pérez SJ, Purino M, Miranda PO, Martín VS, Fernández I, Padrón JI. Prins Cyclization Catalyzed by a FeIII/Trimethylsilyl Halide System: The Oxocarbenium Ion Pathway versus the [2+2] Cycloaddition. Chemistry 2015; 21:15211-7. [PMID: 26471437 DOI: 10.1002/chem.201502488] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Sixto J Pérez
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Martín Purino
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571
| | - Pedro O Miranda
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135
| | - Víctor S Martín
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571.
| | - Israel Fernández
- Departamento de Química Orgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid (Spain).
| | - Juan I Padrón
- Instituto Universitario de Bio-Orgánica "Antonio González", Universidad de La Laguna, C/Francisco Sánchez 2, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922318571.
- Instituto de Productos Naturales y Agrobiología, Consejo Superior de Investigaciones Científicas (CSIC), C/Francisco Sánchez 3, 38206 La Laguna, Tenerife (Spain), Fax: (+34) 922260135.
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11
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Read ML, Krapp A, Miranda PO, Gundersen LL. Synthesis of complex fused polycyclic heterocycles utilizing IMDAF reactions of allylamino- or allyloxy-furyl(hetero)arenes. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.079] [Citation(s) in RCA: 15] [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] [Indexed: 10/14/2022]
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12
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Cambeiro XC, Martín-Rapún R, Miranda PO, Sayalero S, Alza E, Llanes P, Pericàs MA. Continuous-flow enantioselective α-aminoxylation of aldehydes catalyzed by a polystyrene-immobilized hydroxyproline. Beilstein J Org Chem 2011; 7:1486-93. [PMID: 22238521 PMCID: PMC3252847 DOI: 10.3762/bjoc.7.172] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [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: 08/31/2011] [Accepted: 10/17/2011] [Indexed: 11/28/2022] Open
Abstract
The application of polystyrene-immobilized proline-based catalysts in packed-bed reactors for the continuous-flow, direct, enantioselective α-aminoxylation of aldehydes is described. The system allows the easy preparation of a series of β-aminoxy alcohols (after a reductive workup) with excellent optical purity and with an effective catalyst loading of ca. 2.5% (four-fold reduction compared to the batch process) working at residence times of ca. 5 min.
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Affiliation(s)
- Xacobe C Cambeiro
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Rafael Martín-Rapún
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Pedro O Miranda
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Sonia Sayalero
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Esther Alza
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Patricia Llanes
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
| | - Miquel A Pericàs
- Institute of Chemical Research of Catalonia (ICIQ). Avda. Països Catalans, 16. E-43007, Tarragona, Spain
- Departament de Química Orgànica, Universitat de Barcelona. Avda. Martí I Franqués, 1. E-08028, Barcelona, Spain
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Read ML, Braendvang M, Miranda PO, Gundersen LL. Synthesis and biological evaluation of pyrimidine analogs of antimycobacterial purines. Bioorg Med Chem 2010; 18:3885-97. [PMID: 20488716 DOI: 10.1016/j.bmc.2010.04.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 04/13/2010] [Accepted: 04/15/2010] [Indexed: 11/18/2022]
Abstract
Pyrimidine analogs of antimycobacterial 6-aryl-9-benzylpurines have been synthesized and screened for antibacterial activity against Mycobacterium tuberculosis H(37)Rv in vitro. Several active compounds were identified and the best results were observed for 5-formamidopyrimidines. These compounds generally displayed IC(90) values < or =1microg/mL, and they exhibited low toxicity towards mammalian cells. Imidazolylpyrimidines, which may be regarded as fleximer analogs of the parent purines, were also synthesized and one of them was found to be quite a potent inhibitor of M. tuberculosis (IC(90) 14microg/mL).
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Affiliation(s)
- Matthew L Read
- Department of Chemistry, University of Oslo, Blindern, N-0315 Oslo, Norway
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Abstract
4-Substituted 1-(p-methoxybenzyl)imidazoles were designed and synthesized in order to mimic parts of the structure of highly potent antimycobacterial 6-aryl-9-(p-methoxybenzyl)purines. 4-Haloimidazoles were subjected to Pd-catalyzed cross-coupling in order to introduce a (hetero)aryl group, or they were converted to Grignard reagents and reacted with (hetero)arylaldehydes. Further transformations of the adducts gave a variety of potential antimycobacterials with different "spacers" between the imidazole and (hetero)aryl group. The adduct from furfural was rearranged to a cyclopentenone derivative when treated with methanol under acidic conditions. Several target compounds exhibited antimycobacterial activity in vitro (IC(90 )13 microg/mL for the best inhibitors), but they were not as active as the most potent purines and pyrimidines synthesized before.
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Affiliation(s)
- Pedro O Miranda
- Department of Chemistry, University of Oslo, Blindern, Oslo, Norway
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León LG, Carballo RM, Vega-Hernández MC, Miranda PO, Martín VS, Padrón JI, Padrón JM. beta'-Hydroxy-alpha,beta-unsaturated ketones: A new pharmacophore for the design of anticancer drugs. Part 2. ChemMedChem 2009; 3:1740-7. [PMID: 18846591 DOI: 10.1002/cmdc.200800212] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Novel antiproliferative beta'-acyloxy-alpha,beta-unsaturated ketones were obtained by means of an iron(III)-catalyzed multicomponent domino process (ABB' 3CR). The most active derivatives displayed GI(50) values in the range of 0.5-3.9 muM against a panel of representative human solid tumor cell lines: A2780, SW1573, HBL-100, T-47D and WiDr. Analysis of cells following 24 h exposure to these drugs showed cell cycle arrest in the S and G(2)/M phase, in a dose-dependent manner. Our data indicate that the beta'-acyloxy-alpha,beta-unsaturated ketones cause permanent damage to the cells and induce apoptosis.
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Affiliation(s)
- Leticia G León
- Instituto Universitario de Bio-Orgánica "Antonio González" (IUBO-AG), Universidad de la Laguna, C/ Astrofísico Francisco Sánchez, 2, 38206 La Laguna, Spain
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16
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Affiliation(s)
- Pedro O. Miranda
- Instituto Universitario de Bio-Orgánica “Antonio González” Departamento de Química Orgánica, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain, and Instituto de Productos Naturales y Agrobiología, CSIC C/Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Rubén M. Carballo
- Instituto Universitario de Bio-Orgánica “Antonio González” Departamento de Química Orgánica, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain, and Instituto de Productos Naturales y Agrobiología, CSIC C/Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Víctor S. Martín
- Instituto Universitario de Bio-Orgánica “Antonio González” Departamento de Química Orgánica, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain, and Instituto de Productos Naturales y Agrobiología, CSIC C/Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
| | - Juan I. Padrón
- Instituto Universitario de Bio-Orgánica “Antonio González” Departamento de Química Orgánica, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain, and Instituto de Productos Naturales y Agrobiología, CSIC C/Astrofísico Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
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León LG, Miranda PO, Martín VS, Padrón JI, Padrón JM. Antiproliferative activity of 4-chloro-5,6-dihydro-2H-pyrans. Part 2: Enhancement of drug cytotoxicity. Bioorg Med Chem Lett 2007; 17:3087-90. [PMID: 17398091 DOI: 10.1016/j.bmcl.2007.03.045] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2007] [Revised: 03/12/2007] [Accepted: 03/14/2007] [Indexed: 11/17/2022]
Abstract
The Prins reaction was the basis to synthesize functionalized alkyl chlorodihydropyran derivatives. The inexpensive, stable, and environmentally friendly FeCl(3) promotes the cyclization. The method represents an efficient and regioselective manner to obtain in a single step chlorovinyl-TMS oxacycles. The in vitro antiproliferative activities of the compounds were examined in the human solid tumor cell lines A2780 (ovarian cancer), SW1573 (non-small cell lung cancer), and WiDr (colon cancer). Overall, the results show an enhancement in the cytotoxicity exhibited by the new analogs when compared to their parental compounds.
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Affiliation(s)
- Leticia G León
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, C/ Astrofísico Francisco Sánchez 2, 38206 La Laguna, Spain
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18
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Miranda PO, León LG, Martín VS, Padrón JI, Padrón JM. One-pot synthesis and SAR study of cis-2,6-dialkyl-4-chloro-tetrahydropyrans. Bioorg Med Chem Lett 2006; 16:3135-8. [PMID: 16603350 DOI: 10.1016/j.bmcl.2006.03.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2006] [Revised: 03/17/2006] [Accepted: 03/18/2006] [Indexed: 10/24/2022]
Abstract
A series of cis-2,6-dialkyl-4-chloro-tetrahydropyrans were prepared by means of an iron(III)-catalyzed process. The in vitro antiproliferative activities were examined in the human solid tumor cell lines A2780, SW1573, and WiDr. The results show that the presence of bulky substituents favors the Prins cyclization leading to new products with better activity profile against all cell lines tested.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, C/ Astrofísico Francisco Sánchez 2, 38206 La Laguna, Spain
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Padrón JM, Miranda PO, Padrón JI, Martín VS. β′-Hydroxy-α,β-unsaturated ketones: A new pharmacophore for the design of anticancer drugs. Bioorg Med Chem Lett 2006; 16:2266-9. [PMID: 16439115 DOI: 10.1016/j.bmcl.2006.01.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2005] [Revised: 01/05/2006] [Accepted: 01/06/2006] [Indexed: 11/15/2022]
Abstract
A series of beta'-hydroxy-alpha,beta-unsaturated ketones were prepared by means of an iron(III) catalyzed domino process. The in vitro antiproliferative activities were examined in the human solid tumor cell lines A2780, SW1573, and WiDr. The results showed that beta'-hydroxy-alpha,beta-unsaturated ketones were more potent than alpha,beta-unsaturated ketones. The best activity profiles were obtained for the derivatives bearing cyclic or branched substituents on the side chains.
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Affiliation(s)
- José M Padrón
- Instituto Universitario de Bio-Orgánica Antonio González (IUBO-AG), Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Spain.
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Miranda PO, Ramírez MA, Martín VS, Padrón JI. The Silylalkyne-Prins Cyclization: Stereoselective Synthesis of Tetra- and Pentasubstituted Halodihydropyrans. Org Lett 2006; 8:1633-6. [PMID: 16597128 DOI: 10.1021/ol060247m] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [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
[reaction: see text] A new type of Prins cyclization using silylated secondary homopropargylic alcohols and aldehydes yielding tetra- and pentasubstituted dihydropyrans is described. The presence of the trimethylsilyl group in the triple bond favors the Prins cyclization and minimizes the 2-oxonia-[3,3]-sigmatropic rearrangement as a competitive alternative pathway. Ab initio theoretical calculations of the species involved in the rearrangements support the proposed mechanism. The process is highly stereoselective, affording cis-dihydropyran as the only isomer.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Organica "Antonio Gonzalez", Universidad de La Laguna, C/Astrofísico Francisco Sanchez 2, 38206 La Laguna, Tenerife, Spain
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Abstract
A series of functionalized tetrahydropyran and dihydropyran derivatives was synthesized by means of a Prins-type cyclization between unsaturated alcohols and several aldehydes. An unprecedented dimer bearing two 4-chloro-5,6-dihydro-2H-pyran scaffolds was obtained in high yield. A panel of three representative human solid tumor cells from diverse origin was used to assess the cytotoxicity of the compounds. Overall, the results show the relevance of the chlorovinyl group in the biological activity, and 2-alkyl-4-chloro-5,6-dihydro-2H-pyrans represent interesting leads for further chemical modifications and biological studies.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González (IUBO-AG), Universidad de la Laguna, C/Astrofísico Francisco Sánchez, 2, 38206 La Laguna, and Instituto Canario de Investigación Biomédica, Hospital Universitario NS de Candelaria, Tenerife, Spain
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Miranda PO, Ramírez MA, Padrón JI, Martín VS. In situ generation of 2,3-allenolates in the coupling of secondary homopropargylic alcohols and aldehydes. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.11.032] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Miranda PO, Díaz DD, Padrón JI, Ramírez MA, Martín VS. Fe(III) Halides as Effective Catalysts in Carbon−Carbon Bond Formation: Synthesis of 1,5-Dihalo-1,4-dienes, α,β-Unsaturated Ketones, and Cyclic Ethers. J Org Chem 2004; 70:57-62. [PMID: 15624906 DOI: 10.1021/jo048410j] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.2] [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
Iron(III) halides have proven to be excellent catalysts in the coupling of acetylenes and aldehydes. When terminal acetylenes were used the main products obtained were 1,5-dihalo-1,4-dienes with (E,Z)-stereochemistry contaminated in some cases with (E)-alpha,beta-unsaturated ketones. The former carbonyl derivatives were the sole products isolated when nonterminal aromatic alkynes were used. When homopropargylic alcohols were used, a Prins-type cyclization occurred yielding 2-alkyl-4-halo-5,6-dihydro-2H-pyrans. In addition, anhydrous ferric halides are also shown to be excellent catalysts for the standard Prins cyclization with homoallylic alcohols. Isolation of an intermediate acetal, calculations, and alkyne hydration studies provide substantiation of a proposed mechanism.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González and Departamento de Física Básica, Universidad de La Laguna, C/Astrofísico Francisco Sánchez s/n, 38206 La Laguna, Tenerife, Canary Islands, Spain
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Miranda PO, Estévez F, Quintana J, García CI, Brouard I, Padrón JI, Pivel JP, Bermejo J. Enantioselective Synthesis and Biological Activity of (3S,4R)- and (3S,4S)-3-Hydroxy-4-hydroxymethyl- 4-butanolides in Relation to PGE2. J Med Chem 2003; 47:292-5. [PMID: 14711302 DOI: 10.1021/jm034216y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [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: 11/29/2022]
Abstract
Compounds 9 and 13 were synthesized, and their structures and stereochemistry were elucidated by spectroscopic methods. In competition binding experiments, specific [(3)H]-PGE(2) binding was significantly displaced by compound 9 and, to a lesser extent, by 13, in a dose-dependent manner. The biological properties of compound 9 were studied on HL-60 cells, and several effects were found related to those of PGE(2). Compound 9 increases c-fos mRNA level as does PGE(2) and antagonizes TPA-induced terminal differentiation.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González-Instituto de Productos Naturales y Agrobiología-CSIC, Avenida Astrofísico F. Sánchez 3, 38206 La Laguna, Tenerife, Canary Islands, Spain
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Miranda PO, Díaz DD, Padrón JI, Bermejo J, Martín VS. Iron(III)-catalyzed Prins-type cyclization using homopropargylic alcohol: a method for the synthesis of 2-alkyl-4-halo-5,6-dihydro-2H-pyrans. Org Lett 2003; 5:1979-82. [PMID: 12762701 DOI: 10.1021/ol034568z] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [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
[reaction: see text] A new Prins-type cyclization between homopropargylic alcohol and aldehydes in the presence of FeX(3) to obtain 2-alkyl-4-halo-5,6-dihydro-2H-pyrans in good yield is described. Osmium-catalyzed cis dihydroxylation provided direct access to trans-2-alkyl-3-hydroxy-tetrahydro-pyran-4-ones. Anhydrous ferric halides are also shown to be excellent catalysts for the standard Prins cyclization using homoallylic alcohol. Isolation of an intermediate acetal provides substantiation of a proposed mechanism.
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Affiliation(s)
- Pedro O Miranda
- Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna, C/Astrofísico Francisco Sánchez 2, 38206 La Laguna, Tenerife, Spain
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Miranda PO, Brouard I, Padrón JI, Bermejo J. Ferric chloride: a mild and versatile reagent for the formation of 1,6-anhydro glucopyranoses. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00821-9] [Citation(s) in RCA: 17] [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: 11/29/2022]
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