1
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Cushing VI, Koh AF, Feng J, Jurgaityte K, Bondke A, Kroll SHB, Barbazanges M, Scheiper B, Bahl AK, Barrett AGM, Ali S, Kotecha A, Greber BJ. High-resolution cryo-EM of the human CDK-activating kinase for structure-based drug design. Nat Commun 2024; 15:2265. [PMID: 38480681 PMCID: PMC10937634 DOI: 10.1038/s41467-024-46375-9] [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] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 02/23/2024] [Indexed: 03/17/2024] Open
Abstract
Rational design of next-generation therapeutics can be facilitated by high-resolution structures of drug targets bound to small-molecule inhibitors. However, application of structure-based methods to macromolecules refractory to crystallization has been hampered by the often-limiting resolution and throughput of cryogenic electron microscopy (cryo-EM). Here, we use high-resolution cryo-EM to determine structures of the CDK-activating kinase, a master regulator of cell growth and division, in its free and nucleotide-bound states and in complex with 15 inhibitors at up to 1.8 Å resolution. Our structures provide detailed insight into inhibitor interactions and networks of water molecules in the active site of cyclin-dependent kinase 7 and provide insights into the mechanisms contributing to inhibitor selectivity, thereby providing the basis for rational design of next-generation therapeutics. These results establish a methodological framework for the use of high-resolution cryo-EM in structure-based drug design.
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Affiliation(s)
- Victoria I Cushing
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK
| | - Adrian F Koh
- Materials and Structural Analysis Division, Thermo Fisher Scientific, Achtseweg Noord 5, 5651, Eindhoven, The Netherlands
| | - Junjie Feng
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK
| | - Kaste Jurgaityte
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK
| | | | | | - Marion Barbazanges
- Department of Chemistry, Imperial College London, London, UK
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, 4 Place Jussieu, 75252, Paris Cedex 05, France
| | - Bodo Scheiper
- Department of Chemistry, Imperial College London, London, UK
| | - Ash K Bahl
- Carrick Therapeutics, Nova UCD, Bellfield Innovation Park, Dublin 4, Ireland
| | | | - Simak Ali
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, UK.
| | - Abhay Kotecha
- Materials and Structural Analysis Division, Thermo Fisher Scientific, Achtseweg Noord 5, 5651, Eindhoven, The Netherlands.
| | - Basil J Greber
- The Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK.
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2
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Mies T, White AJP, Rzepa HS, Barluzzi L, Devgan M, Layfield RA, Barrett AGM. Syntheses and Characterization of Main Group, Transition Metal, Lanthanide, and Actinide Complexes of Bidentate Acylpyrazolone Ligands. Inorg Chem 2023; 62:13253-13276. [PMID: 37549423 PMCID: PMC10445273 DOI: 10.1021/acs.inorgchem.3c01506] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Indexed: 08/09/2023]
Abstract
The synthesis of acylpyrazolone salts and their complexes of main group elements, transition metals, lanthanides, and actinides are described and characterized inter alia by means of single-crystal X-ray crystallography, NMR, and IR spectroscopies. The complexes consist of two, three, or four acylprazolone ligands bound to the metal atom, resulting in a structurally diverse set of coordination complexes with (distorted) octahedral, pentagonal-bipyramidal, or antiprismatic arrangements. Several complexes proved to be polymeric in the solid state including heterobimetallic sodium/lanthanide coordination polymers. A selection of the polymeric compounds was analyzed via TG/DTA measurements to establish their stability. The ligands, in turn, were readily synthesized in good yields from commercially available hydrazine hydrochloride salts. These findings demonstrate that acylpyrazolone ligands can form complexes with metals of varying ionic radii, highlighted by their utility in other areas such as analytical and metal organic framework chemistry.
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Affiliation(s)
- Thomas Mies
- Department
of Chemistry, Imperial College, Molecular
Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, England
| | - Andrew J. P. White
- Department
of Chemistry, Imperial College, Molecular
Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, England
| | - Henry S. Rzepa
- Department
of Chemistry, Imperial College, Molecular
Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, England
| | - Luciano Barluzzi
- Department
of Chemistry, University of Sussex, Falmer, Brighton BN1 9QR, England
| | - Mohit Devgan
- Department
of Chemistry, Imperial College, Molecular
Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, England
| | - Richard A. Layfield
- Department
of Chemistry, University of Sussex, Falmer, Brighton BN1 9QR, England
| | - Anthony G. M. Barrett
- Department
of Chemistry, Imperial College, Molecular
Sciences Research Hub, White City Campus, 82 Wood Lane, London W12 0BZ, England
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3
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Winter C, Siepe I, Wise A, Dorali A, Barrett AGM, Witschel M. Agrochemical Lessons for Infectious Disease Research: New Resistance Breaking Antifungal Hits against Candida auris. ACS Med Chem Lett 2023; 14:136-140. [PMID: 36793433 PMCID: PMC9923843 DOI: 10.1021/acsmedchemlett.2c00497] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 01/16/2023] [Indexed: 01/26/2023] Open
Abstract
Analysis of the history of the invention of the block-buster antifungal drug Fluconazole underscores the importance of agrochemical research on drug discovery and development. The multidrug resistant fungal pathogen Candida auris is now responsible for serious morbidity and mortality among immuno-compromised and long-term resident hospital patients globally. New drugs against C. auris are urgently needed. A focused screening of 1487 fungicides from the BASF agrochemical collection gave several potent inhibitors of C. auris with yet noncommercialized modes of action. The hits showed only minor activity loss against the azole-resistant C. auris strain CDC 0385 and low to moderate cytotoxicity to human HepG2 cells. Aminopyrimidine 4 showed high activity against resistant strains and selectivity in a HepG2 cells assay and is a potential hit candidate for further optimization.
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Affiliation(s)
| | | | - Andrew Wise
- Evotec, Alderley
Park, Cheshire SK10 4TG, U.K.
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4
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Mies T, White AJP, Parsons PJ, Barrett AGM. Photolytic Studies on the Generation and Trapping of 6‐Oxomethylidenecyclohexa‐2,4‐diene‐1‐one Derivatives with Various Nucleophiles. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100189] [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)
- Thomas Mies
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Andrew J. P. White
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Philip J. Parsons
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Anthony G. M. Barrett
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
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5
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Barrett AGM, Cavalli ES. Medicinal Chemistry in South America: From Tropical Diseases to Cancers and Other Major Afflictions. ACS Med Chem Lett 2021; 12:1350-1356. [PMID: 34531941 DOI: 10.1021/acsmedchemlett.1c00413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Affiliation(s)
- Anthony G. M. Barrett
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, England
| | - Elfie S. Cavalli
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, 80 Wood Lane, London W12 0BZ, England
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6
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Mies T, Patel C, Parsons PJ, Barrett AGM. Biomimetic Total Syntheses of Amorfrutins A, B, (
S
)‐D and (
R
)‐D and Formal Synthesis of Amorfrutin C. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Thomas Mies
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Calum Patel
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Philip J. Parsons
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Anthony G. M. Barrett
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
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7
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Riedel R, Seel AG, Malko D, Miller DP, Sperling BT, Choi H, Headen TF, Zurek E, Porch A, Kucernak A, Pyper NC, Edwards PP, Barrett AGM. Superalkali-Alkalide Interactions and Ion Pairing in Low-Polarity Solvents. J Am Chem Soc 2021; 143:3934-3943. [PMID: 33660507 PMCID: PMC8028040 DOI: 10.1021/jacs.1c00115] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Indexed: 11/30/2022]
Abstract
The nature of anionic alkali metals in solution is traditionally thought to be "gaslike" and unperturbed. In contrast to this noninteracting picture, we present experimental and computational data herein that support ion pairing in alkalide solutions. Concentration dependent ionic conductivity, dielectric spectroscopy, and neutron scattering results are consistent with the presence of superalkali-alkalide ion pairs in solution, whose stability and properties have been further investigated by DFT calculations. Our temperature dependent alkali metal NMR measurements reveal that the dynamics of the alkalide species is both reversible and thermally activated suggesting a complicated exchange process for the ion paired species. The results of this study go beyond a picture of alkalides being a "gaslike" anion in solution and highlight the significance of the interaction of the alkalide with its complex countercation (superalkali).
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Affiliation(s)
- René Riedel
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12
0BZ, U.K.
| | - Andrew G. Seel
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E
6BT, U.K.
- Inorganic
Chemistry Laboratories, University of Oxford, Park Royal Road, Oxford OX1 3QR, U.K.
| | - Daniel Malko
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12
0BZ, U.K.
| | - Daniel P. Miller
- Department
of Chemistry, Hofstra University, 106 Berliner Hall, Hempstead, New York 11549, United States
| | - Brendan T. Sperling
- Department
of Chemistry, Hofstra University, 106 Berliner Hall, Hempstead, New York 11549, United States
| | - Heungjae Choi
- School
of Engineering, Cardiff University, Cardiff CF24 3AA, U.K.
| | - Thomas F. Headen
- ISIS Neutron
and Muon Source, Science and Technology
Facilities Council, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, U.K.
| | - Eva Zurek
- Department
of Chemistry, State University of New York
at Buffalo, 777 Natural Sciences Complex, Buffalo, New York 14260-3000, United States
| | - Adrian Porch
- School
of Engineering, Cardiff University, Cardiff CF24 3AA, U.K.
| | - Anthony Kucernak
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12
0BZ, U.K.
| | - Nicholas C. Pyper
- University
Chemical Laboratory, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Peter P. Edwards
- Inorganic
Chemistry Laboratories, University of Oxford, Park Royal Road, Oxford OX1 3QR, U.K.
| | - Anthony G. M. Barrett
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12
0BZ, U.K.
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8
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Patel C, Mies T, White AJP, Parsons PJ, Barrett AGM. Biomimetic Syntheses of Amorfrutin C and
C
‐5 Substituted Amorfrutin Analogues. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001487] [Citation(s) in RCA: 4] [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: 01/29/2023]
Affiliation(s)
- Calum Patel
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Thomas Mies
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Andrew J. P. White
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Philip J. Parsons
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
| | - Anthony G. M. Barrett
- Department of Chemistry Molecular Sciences Research Hub Imperial College London, White City Campus Wood Lane London W12 0BZ England
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9
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Mies T, White AJP, Parsons PJ, Barrett AGM. Biomimetic Syntheses of Analogs of Hongoquercin A and B by Late-Stage Derivatization. J Org Chem 2020; 86:1802-1817. [DOI: 10.1021/acs.joc.0c02638] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Thomas Mies
- Department of Chemistry, Imperial College, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, England
| | - Andrew J. P. White
- Department of Chemistry, Imperial College, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, England
| | - Philip J. Parsons
- Department of Chemistry, Imperial College, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, England
| | - Anthony G. M. Barrett
- Department of Chemistry, Imperial College, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, England
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10
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Mies T, Ma TK, Barrett AGM. Syntheses of polyfunctional aromatic compounds from non-aromatic precursors. Russ Chem Rev 2020. [DOI: 10.1070/rcr4931] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Qu T, White AJP, Barrett AGM. Four-directional synthesis of adamantane derivatives. ARKIVOC 2020. [DOI: 10.24820/ark.5550190.p011.237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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12
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Ma TK, Parsons PJ, Barrett AGM. Front Cover: Synthesis, Aromatization and Derivatization Reactions of 2-[9-(tert
-Butoxycarbonyl)-4-oxo-1,5-dioxa-9-azaspiro[5.5]undec-2-en-2-yl]acetic Acid (Eur. J. Org. Chem. 1/2020). European J Org Chem 2019. [DOI: 10.1002/ejoc.201901831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tsz-Kan Ma
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
| | - Philip J. Parsons
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
| | - Anthony G. M. Barrett
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
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13
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Ma TK, Parsons PJ, Barrett AGM. Synthesis, Aromatization and Derivatization Reactions of 2-[9-(tert
-Butoxycarbonyl)-4-oxo-1,5-dioxa-9-azaspiro[5.5]undec-2-en-2-yl]acetic Acid. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901451] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Tsz-Kan Ma
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
| | - Philip J. Parsons
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
| | - Anthony G. M. Barrett
- Department of Chemistry; Molecular Sciences Research Hub; Imperial College London; White City Campus, Wood Lane W12 0BZ London England
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14
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Goldup SM, Pilkington CJ, White AJP, Burton A, Barrett AGM. Correction to “A Simple, Short, and Flexible Synthesis of Viridiofungin Derivatives”. J Org Chem 2019; 84:6546. [DOI: 10.1021/acs.joc.9b01172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Ma TK, Parsons PJ, Barrett AGM. Meroterpenoid Synthesis via Sequential Polyketide Aromatization and Radical Anion Cascade Triene Cyclization: Biomimetic Total Syntheses of Austalide Natural Products. J Org Chem 2019; 84:4961-4970. [PMID: 30938997 PMCID: PMC7007238 DOI: 10.1021/acs.joc.9b00142] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The
first total synthesis of five austalide natural products, (±)-17S-dihydroaustalide K, (±)-austalide K, (±)-13-deacetoxyaustalide
I, (±)-austalide P, and (±)-13-deoxyaustalide Q acid, was
accomplished via a series of biomimetic transformations. Key steps
involved polyketide aromatization of a trans,trans-farnesol-derived β,δ-diketodioxinone into
the corresponding β-resorcylate, followed by titanium(III)-mediated
reductive radical cyclization of an epoxide to furnish the drimene
core. Subsequent phenylselenonium ion induced diastereoselective cyclization
of the drimene completed the essential carbon framework of the austalides
to access (±)-17S-dihydroaustalide K, (±)-austalide
K, and (±)-13-deacetoxyaustalide I via sequential oxidations.
Furthermore, (±)-13-deacetoxyaustalide I could serve as a common
intermediate to be derivatized into other related natural products,
(±)-austalide P and (±)-13-deoxyaustalide Q acid, by functionalizing
the cyclic lactone moiety.
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Affiliation(s)
- Tsz-Kan Ma
- Department of Chemistry , Imperial College , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , England
| | - Philip J Parsons
- Department of Chemistry , Imperial College , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , England
| | - Anthony G M Barrett
- Department of Chemistry , Imperial College , Molecular Sciences Research Hub, White City Campus, Wood Lane , London W12 0BZ , England
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16
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Ma TK, Elliott DC, Reid S, White AJP, Parsons PJ, Barrett AGM. Meroterpenoid Synthesis via Sequential Polyketide Aromatization and Cationic Polyene Cyclization: Total Syntheses of (+)-Hongoquercin A and B and Related Meroterpenoids. J Org Chem 2018; 83:13276-13286. [PMID: 30346765 PMCID: PMC6303087 DOI: 10.1021/acs.joc.8b02095] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 11/29/2022]
Abstract
![]()
(+)-Hongoquercin A and B were synthesized
from commercially available trans,trans-farnesol in six and eleven
steps, respectively, using dual biomimetic strategies with polyketide
aromatization and subsequent polyene functionalization from a common
farnesyl-resorcylate intermediate. Key steps involve Pd(0)-catalyzed
decarboxylative allylic rearrangement of a dioxinone β,δ-diketo
ester to a β,δ-diketo dioxinone, which was readily aromatized
into the corresponding resorcylate, and subsequent polyene cyclization
via enantioselective protonation or regioselective terminal alkene
oxidation and cationic cyclization of enantiomerically enriched epoxide
to furnish the tetracyclic natural product cores. Analogues of the
hongoquercin were synthesized via halonium-induced polyene cyclizations,
and the meroterpenoid could be further functionalized via saponification,
hydrolytic decarboxylation, reduction, and amidation reactions.
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Affiliation(s)
- Tsz-Kan Ma
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
| | - Daniel C Elliott
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
| | - Stephanie Reid
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
| | - Andrew J P White
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
| | - Philip J Parsons
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
| | - Anthony G M Barrett
- Department of Chemistry , Imperial College , London , SW7 2AZ , England.,Department of Chemistry , Imperial College London, Molecular Sciences Research Hub , White City Campus, Wood Lane, London W12 0BZ , England
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17
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Almond-Thynne J, Han J, White AJP, Polyzos A, Parsons PJ, Barrett AGM. Bidirectional Synthesis of Di- tert-butyl (2 S,6 S,8 S)- and (2 R,6 R,8 R)-1,7-Diazaspiro[5.5]undecane-2,8-dicarboxylate and Related Spirodiamines. J Org Chem 2018; 83:6783-6787. [PMID: 29792022 DOI: 10.1021/acs.joc.8b00794] [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: 11/30/2022]
Abstract
Efficient syntheses of both enantiomers of a spirodiamine diester from (l)- and (d)-aspartic acid are described. The key transformation was the conversion of Boc-protected tert-butyl aspartate into the derived aldehyde, two-directional Horner-Wadsworth-Emmons olefination, hydrogenation, and selective acid-catalyzed Boc-deprotection and spirocyclization. An alternative, two-directional approach to derivatives of 1,7-diazaspiro[5.5]undecane is described.
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Affiliation(s)
| | - Jiaxu Han
- Department of Chemistry , Imperial College London , London , SW7 2AZ , U.K
| | - Andrew J P White
- Department of Chemistry , Imperial College London , London , SW7 2AZ , U.K
| | - Anastasios Polyzos
- CSIRO Manufacturing, Clayton , Victoria 3169 , Australia.,School of Chemistry , University of Melbourne , Parkville , Melbourne , Victoria 3010 , Australia
| | - Philip J Parsons
- Department of Chemistry , Imperial College London , London , SW7 2AZ , U.K
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18
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Patel H, Periyasamy M, Sava GP, Bondke A, Slafer BW, Kroll SHB, Barbazanges M, Starkey R, Ottaviani S, Harrod A, Aboagye EO, Buluwela L, Fuchter MJ, Barrett AGM, Coombes RC, Ali S. ICEC0942, an Orally Bioavailable Selective Inhibitor of CDK7 for Cancer Treatment. Mol Cancer Ther 2018; 17:1156-1166. [PMID: 29545334 PMCID: PMC5985928 DOI: 10.1158/1535-7163.mct-16-0847] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 12/22/2017] [Accepted: 03/06/2018] [Indexed: 12/31/2022]
Abstract
Recent reports indicate that some cancer types are especially sensitive to transcription inhibition, suggesting that targeting the transcriptional machinery provides new approaches to cancer treatment. Cyclin-dependent kinase (CDK)7 is necessary for transcription, and acts by phosphorylating the C-terminal domain (CTD) of RNA polymerase II (PolII) to enable transcription initiation. CDK7 additionally regulates the activities of a number of transcription factors, including estrogen receptor (ER)-α. Here we describe a new, orally bioavailable CDK7 inhibitor, ICEC0942. It selectively inhibits CDK7, with an IC50 of 40 nmol/L; IC50 values for CDK1, CDK2, CDK5, and CDK9 were 45-, 15-, 230-, and 30-fold higher. In vitro studies show that a wide range of cancer types are sensitive to CDK7 inhibition with GI50 values ranging between 0.2 and 0.3 μmol/L. In xenografts of both breast and colorectal cancers, the drug has substantial antitumor effects. In addition, combination therapy with tamoxifen showed complete growth arrest of ER-positive tumor xenografts. Our findings reveal that CDK7 inhibition provides a new approach, especially for ER-positive breast cancer and identify ICEC0942 as a prototype drug with potential utility as a single agent or in combination with hormone therapies for breast cancer. ICEC0942 may also be effective in other cancers that display characteristics of transcription factor addiction, such as acute leukaemia and small-cell lung cancer. Mol Cancer Ther; 17(6); 1156-66. ©2018 AACR.
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Affiliation(s)
- Hetal Patel
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Manikandan Periyasamy
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Georgina P Sava
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Alexander Bondke
- Department of Chemistry, Imperial College London, London, United Kingdom
| | - Brian W Slafer
- Department of Chemistry, Imperial College London, London, United Kingdom
| | | | - Marion Barbazanges
- Department of Chemistry, Imperial College London, London, United Kingdom
| | - Richard Starkey
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Silvia Ottaviani
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Alison Harrod
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Eric O Aboagye
- Comprehensive Cancer Imaging Centre, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Laki Buluwela
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Matthew J Fuchter
- Department of Chemistry, Imperial College London, London, United Kingdom
| | | | - R Charles Coombes
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom.
| | - Simak Ali
- Division of Cancer, Department of Surgery & Cancer, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom.
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Ali S, Patel H, Periyasamy M, Sava G, Bondke A, Slafer BW, Kroll SHB, Barbazanges M, Starkey R, Ottaviani S, Harrod A, Aboagye EO, Buluwela L, Fuchter MJ, Barrett AGM, Coombes RC. Abstract P1-10-05: ICEC0942, a new oral selective inhibitor of the cell cycle and transcriptional regulator CDK7 for the treatment of estrogen receptor positive and negative breast cancer. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p1-10-05] [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
CDK7 is remarkable as a key regulator of both cell cycle progression and gene expression. CDK7 promotes cell cycle progression by phosphorylating cell cycle CDKs in the T-loop, thus stimulating their activities. Additionally, phosphorylation of RNA polymerase II (PolII) by CDK7 is required for transcription initiation. Deregulation of cell cycle and transcription processes is common to most cancer types, so CDK7 inhibitors offer considerable promise as cancer therapeutics.
We previously reported the identification of the first selective CDK7 inhibitor, BS-181, and demonstrated its ability to inhibit breast cancer cell growth in vitro and in vivo (Ali et al 2009 Cancer Res). Screening of more than one thousand analogues has allowed development of a clinical candidate CDK7 inhibitor, named ICEC0942. ICEC0942 selectively inhibits CDK7 with an IC50 of 40nM. In vitro analyses reveal that ICEC0942 inhibits hormone receptor positive and triple-negative breast cancer cell lines, with GI50 values ranging between 0.2-0.3 μM. Growth inhibition is accompanied by inhibition of CDK7 targets, including CDK1, CDK2 and PolII phosphorylation. In xenograft studies using several cancer cell lines, the drug shows substantial anti-tumor effects, with a notable lack of toxicity at efficacious doses. In the combination setting with tamoxifen, ICEC0942 completely blocks growth of ER-positive tumor xenografts, indicative of potential for co-treatment with hormonal agents.
Extensive ADMET and PK/PD studies confirm the suitability of ICEC0942 as a cancer drug and have shown that ICEC0942 is orally bioavailable. Moreover, xenograft tumor studies have allowed definition of surrogate biomarkers of tumor response.
Taken together, our findings confirm CDK7 as an important drug target for ER-positive and -negative breast cancer and identify ICEC0942 as a prototype drug with utility as a single agent or in the combination setting. Our findings also point to the potential value of CDK7 inhibition by ICEC0942 in other cancer types that have characteristics of transcription factor addiction and/or cell cycle deregulation.
Development of ICEC0942 was made possible through funding by EPSRC, Cancer Research UK and Cancer Research Technologies.
Citation Format: Ali S, Patel H, Periyasamy M, Sava G, Bondke A, Slafer BW, Kroll SHB, Barbazanges M, Starkey R, Ottaviani S, Harrod A, Aboagye EO, Buluwela L, Fuchter MJ, Barrett AGM, Coombes RC. ICEC0942, a new oral selective inhibitor of the cell cycle and transcriptional regulator CDK7 for the treatment of estrogen receptor positive and negative breast cancer [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P1-10-05.
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Affiliation(s)
- S Ali
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - H Patel
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - M Periyasamy
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - G Sava
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - A Bondke
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - BW Slafer
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - SHB Kroll
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - M Barbazanges
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - R Starkey
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - S Ottaviani
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - A Harrod
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - EO Aboagye
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - L Buluwela
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - MJ Fuchter
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - AGM Barrett
- Imperial College London, London, United Kingdom; Imperial College London, London
| | - RC Coombes
- Imperial College London, London, United Kingdom; Imperial College London, London
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Bahl AK, Einscow E, Leishman A, Sullivan E, Ali S, Coombes RC, Barrett AGM, Li B, Gallagher WM, Carragher NO, Patel T. Abstract P1-09-04: Activity of CT7001 an orally bio-available cyclin-dependent kinase 7 selective inhibitor in models of triple negative breast cancer. Cancer Res 2018. [DOI: 10.1158/1538-7445.sabcs17-p1-09-04] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Triple-negative breast cancer (TNBC) is a highly aggressive and heterogeneous subtype of breast cancer that commonly exhibit poor prognosis and high relapse rates at early stages after conventional neoadjuvant chemotherapy. CDK7 inhibition has emerged as an 'Achilles heel' in TNBC via blocking transcriptional addiction to a defined cluster of genes (Wang et al 2015). CDK7 acts as a CDK-activating kinase controlling proliferation and as a transcriptional kinase phosphorylating RNA Polymerase II. Eukaryotic RNA polymerase II (Pol II) is a 12-subunit DNA-dependent RNA polymerase that is responsible for transcribing nuclear genes encoding messenger RNAs and several small nuclear RNAs (R Young 1991)
We have demonstrated that established cell-lines and patient derived tumour tissue (PDTT, explants established as models at low passage numbers that have not been grown in plastic or propagated as cell cultures) of TNBC are sensitive to a potent, selective and orally bioavailable CDK7 inhibitor CT7001 (ICEC0942). CT7001 produces a concentration-dependent inhibition of growth with GI50s <1 micromolar across all TNBC cells tested to-date. The inhibition of proliferation was associated with an inhibition of c-MYC, Mcl-1 and phospho-Pol II as determined by Western Blot analysis. This demonstrates that CT7001 effectively controls transcriptional regulation and anti-apoptotic mechanisms in a diverse group of TNBC cellular models.
CT7001 was also evaluated in an in vivo orthotopic-PDX model of TNBC in nu/nu mice. Establishing PDX-xenograft tumour models from PDTT at low passage is believed to conserve original tumour characteristics such as heterogeneous histology, clinical biomolecular signature, malignant phenotypes and genotypes. Therefore, patient-derived tumour grafts are believed to offer relevant predictive insights into clinical outcomes when evaluating the efficacy of novel cancer therapies. Orally administered CT7001 monotherapy produced strong and sustained regression of the tumour that persisted during the dosing schedule and strong suppression was still maintained upon cessation of treatment. At doses that produced regression CT7001 was well tolerated with little effect on body weight loss (<10%).
CT7001 is a potent, selective and orally bioavailable inhibitor of CDK7 that shows promise as a potential new treatment for TNBC.
References
Richard A. Young Annual Review of Biochemistry. 1991 60 (1): 689–715
Wang et al Cell. 2015 163(1):174-86.
Citation Format: Bahl AK, Einscow E, Leishman A, Sullivan E, Ali S, Coombes RC, Barrett AGM, Li B, Gallagher WM, Carragher NO, Patel T. Activity of CT7001 an orally bio-available cyclin-dependent kinase 7 selective inhibitor in models of triple negative breast cancer [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P1-09-04.
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Affiliation(s)
- AK Bahl
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - E Einscow
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - A Leishman
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - E Sullivan
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - S Ali
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - RC Coombes
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - AGM Barrett
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - B Li
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - WM Gallagher
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - NO Carragher
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
| | - T Patel
- Carrick Therapeutics, Dublin, Ireland; Imperial College, London, United Kingdom; UCD School of Biomolecular and Biomedical Science, UCD Conway Institute University College Dublin, Dublin, Ireland; Cancer Research UK, Edinburgh Centre, Institute of Genetics and Molecular Medicine, Edinburgh, United Kingdom
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Hazel P, Kroll SHB, Bondke A, Barbazanges M, Patel H, Fuchter MJ, Coombes RC, Ali S, Barrett AGM, Freemont PS. Corrigendum: Inhibitor Selectivity for Cyclin-Dependent Kinase 7: A Structural, Thermodynamic, and Modelling Study. ChemMedChem 2018; 13:207. [PMID: 29372749 DOI: 10.1002/cmdc.201700826] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2024]
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Almond-Thynne J, White AJP, Polyzos A, Rzepa HS, Parsons PJ, Barrett AGM. Synthesis and Reactions of Benzannulated Spiroaminals: Tetrahydrospirobiquinolines. ACS Omega 2017; 2:3241-3249. [PMID: 30023690 PMCID: PMC6044889 DOI: 10.1021/acsomega.7b00482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 05/19/2017] [Indexed: 06/08/2023]
Abstract
An efficient two-step synthesis of symmetrical and unsymmetrical tetrahydrospirobiquinolines from o-azidobenzaldehydes is reported. A novel series of tetrahydrospirobiquinolines was prepared by sequential double-aldol condensation with acetone, cyclopentanone, and cyclohexanone to form the corresponding o,o'-diazido-dibenzylidene-acetone, -cyclopentanone, and -cyclohexanone derivatives, respectively, and hydrogenation-spirocyclization. The spirodiamines were further derivatized by electrophilic aromatic bromination, Suzuki coupling, and N-alkylation, all of which proceeded with preservation of the spirocyclic core.
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Affiliation(s)
| | - Andrew J. P. White
- Department
of Chemistry, Imperial College London, London SW7 2AZ, England
| | - Anastasios Polyzos
- CSIRO
Manufacturing, Clayton, Victoria 3169, Australia
- School
of Chemistry, University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Henry S. Rzepa
- Department
of Chemistry, Imperial College London, London SW7 2AZ, England
| | - Philip J. Parsons
- Department
of Chemistry, Imperial College London, London SW7 2AZ, England
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Kandela IK, McAuliffe KJ, Cochran LE, Barrett AGM, Hoffman BM, Mazar AP, Trivedi ER. Discovery of the Antitumor Effects of a Porphyrazine Diol (Pz 285) in MDA-MB-231 Breast Tumor Xenograft Models in Mice. ACS Med Chem Lett 2017; 8:705-709. [PMID: 28740602 DOI: 10.1021/acsmedchemlett.7b00063] [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: 02/13/2017] [Accepted: 06/29/2017] [Indexed: 11/29/2022] Open
Abstract
A series of porphyrazines (Pzs) with chiral bis-acetal moieties in the β-pyrrole positions ((2R,3R)-2,3-dimethyl-2,3-dimethoxy-1,4-diox-2-ene) have been synthesized and screened as antitumor agents in MDA-MB-231 breast tumor cells in vitro. The lead Pz 285 was further tested in a mouse tumor xenograft model with Td-tomato-luc2 fluorescent breast tumor cells (MDA-MB-231 LM24 Her2+) that are highly metastatic to the lungs. Pz 285 shows marked antitumor effects in vivo, with treated mice exhibiting longer median survival that we attribute to smaller primary tumor regrowth after resection and less occurrence of metastasis when compared to vehicle control groups. Pz 285 is further compared to the clinically approved chemotherapeutic doxorubicin (Dox). This report lays the groundwork for development of an understudied class of compounds for classical chemotherapy.
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Affiliation(s)
- Irawati K. Kandela
- Center
for Developmental Therapeutics, Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States
| | | | - Lauren E. Cochran
- Department
of Chemistry, Oakland University, Rochester, Michigan 48309, United States
| | - Anthony G. M. Barrett
- Department
of Chemistry, Imperial College of Science, Technology, and Medicine, London SW7 2AZ, England
| | - Brian M. Hoffman
- Departments
of Chemistry and Molecular Biosciences, Northwestern University, Evanston, Illinois 60208, United States
| | - Andrew P. Mazar
- Center
for Developmental Therapeutics, Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois 60208, United States
| | - Evan R. Trivedi
- Department
of Chemistry, Oakland University, Rochester, Michigan 48309, United States
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Hazel P, Kroll SHB, Bondke A, Barbazanges M, Patel H, Fuchter MJ, Coombes RC, Ali S, Barrett AGM, Freemont PS. Inhibitor Selectivity for Cyclin-Dependent Kinase 7: A Structural, Thermodynamic, and Modelling Study. ChemMedChem 2017; 12:372-380. [PMID: 28125165 DOI: 10.1002/cmdc.201600535] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 01/25/2017] [Indexed: 01/24/2023]
Abstract
Deregulation of the cell cycle by mechanisms that lead to elevated activities of cyclin-dependent kinases (CDK) is a feature of many human diseases, cancer in particular. We identified small-molecule inhibitors that selectively inhibit CDK7, the kinase that phosphorylates cell-cycle CDKs to promote their activities. To investigate the selectivity of these inhibitors we used a combination of structural, biophysical, and modelling approaches. We determined the crystal structures of the CDK7-selective compounds ICEC0942 and ICEC0943 bound to CDK2, and used these to build models of inhibitor binding to CDK7. Molecular dynamics (MD) simulations of inhibitors bound to CDK2 and CDK7 generated possible models of inhibitor binding. To experimentally validate these models, we gathered isothermal titration calorimetry (ITC) binding data for recombinant wild-type and binding site mutants of CDK7 and CDK2. We identified specific residues of CDK7, notably Asp155, that are involved in determining inhibitor selectivity. Our MD simulations also show that the flexibility of the G-rich and activation loops of CDK7 is likely an important determinant of inhibitor specificity similar to CDK2.
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Affiliation(s)
- Pascale Hazel
- Section of Structural Biology, Department of Medicine, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Sebastian H B Kroll
- Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Alexander Bondke
- Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Marion Barbazanges
- Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Hetal Patel
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, UK
| | - Matthew J Fuchter
- Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - R Charles Coombes
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, UK
| | - Simak Ali
- Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London, W12 0NN, UK
| | - Anthony G M Barrett
- Department of Chemistry, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
| | - Paul S Freemont
- Section of Structural Biology, Department of Medicine, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK
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Elliott DC, Ma TK, Selmani A, Cookson R, Parsons PJ, Barrett AGM. Sequential Ketene Generation from Dioxane-4,6-dione-keto-dioxinones for the Synthesis of Terpenoid Resorcylates. Org Lett 2016; 18:1800-3. [PMID: 27043705 DOI: 10.1021/acs.orglett.6b00533] [Citation(s) in RCA: 18] [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: 11/30/2022]
Abstract
Trapping of the ketene generated from the thermolysis of 2-methyl-2-phenyl-1,3-dioxane-4,6-dione-keto-dioxinone at 50 °C with primary, secondary, or tertiary alcohols gave the corresponding dioxinone β-keto-esters in good yield under neutral conditions. These intermediates were converted by palladium(0)-catalyzed decarboxylative allyl migration and aromatization into the corresponding β-resorcylates. These transformations were applied to the syntheses of the natural products (±)-cannabiorcichromenic and (±)-daurichromenic acid.
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Affiliation(s)
- Daniel C Elliott
- Department of Chemistry, Imperial College , London, SW7 2AZ, U.K
| | - Tsz-Kan Ma
- Department of Chemistry, Imperial College , London, SW7 2AZ, U.K
| | - Aymane Selmani
- Department of Chemistry, Imperial College , London, SW7 2AZ, U.K
| | - Rosa Cookson
- Department of Chemistry, Imperial College , London, SW7 2AZ, U.K
| | - Philip J Parsons
- Department of Chemistry, Imperial College , London, SW7 2AZ, U.K
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Kim MS, Buisson LA, Heathcote DA, Hu H, Braddock DC, Barrett AGM, Ashton-Rickardt PG, Snyder JP. Approaches to design non-covalent inhibitors for human granzyme B (hGrB). Org Biomol Chem 2015; 12:8952-65. [PMID: 25277547 DOI: 10.1039/c4ob01874e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A structure-based design campaign for non-covalent small molecule inhibitors of human granzyme B was carried out by means of a virtual screening strategy employing three constraints and probe site-mapping with FTMAP to identify ligand "hot spots". In addition, new scaffolds of diverse structures were subsequently explored with ROCS shape-based superposition methods, following by Glide SP docking, induced fit docking and analysis of QikProp molecular properties. Novel classes of moderately active small molecule blockers (≥25 μM IC50 values) from commercially available libraries were identified, and three novel scaffolds have been synthesized by multi-step procedures. Furthermore, we provide an example of a comprehensive structure-based drug discovery approach to non-covalent inhibitors that relies on the X-ray structure of a covalently bound ligand and suggest that the design path may be compromised by alternative and unknown binding poses.
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Affiliation(s)
- Mi-Sun Kim
- Department of Chemistry, 1515 Dickey Drive. and Emory University, Atlanta, GA 30322, USA.
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Abstract
Resorcylates are a large group of bioactive natural products that are biosynthesized from acetate and malonate units via the intermediacy of polyketides. These polyketides undergo cyclization reactions to introduce the aromatic core. The bioactivities of the resorcylates including resorcylate macrocyclic lactones include anticancer, antimalarial, mycotoxicity, antifungal, and antibiotic properties, and several compounds in the series are already in use in medicine. Examples are prodrugs derived from mycophenolic acid as immunosuppressants and the Hsp-90 inhibitor, AT13387, which is in phase-II clinical trials for the treatment of small cell lung cancer and melanoma. In consequence of these biological activities, methods for the concise synthesis of diverse resorcylates are of considerable importance. In natural product chemistry, biomimetic total synthesis can have significant advantages including functional group tolerance in key steps, the minimization of the use of protection and deprotection reactions and the shortening of the total number of synthetic steps. This Account provides a description of our adaption of the dioxinone chemistry of Hyatt, Clemens, and Feldman for the synthesis and retro-Diels-Alder reactions of diketo-dioxinones. Such dioxinones, which were synthesized by a range of C-acylation reactions, were found to undergo retro-Diels-Alder reactions on heating to provide the corresponding triketo-ketenes with the loss of acetone. The ketene reactive intermediates were rapidly trapped both inter- and intramolecularly with alcohols to provide the corresponding β,δ,ζ-triketo-esters. These compounds, which consist of keto-enol mixtures, readily undergo cycloaromatization to produce resorcylate esters and macrocyclic lactones. We have established the use of diketo-dioxinones as key general intermediates for the synthesis of diverse resorcylate natural products and for the synthesis of new classes of compounds for the generation of medicinal chemistry lead structures. Many of the methods used were found to be tolerant of multiple sensitive functional groups. These include enolate C-acylations with acyl chlorides, 1-acyl-benzotriazoles, acyl imidazolides, or Weinreb amides to prepare diketo-dioxinones and their subsequent use to prepare β,δ,ζ-triketo-esters and lactones and hence resorcylates. In addition, in most cases, phenol protection was avoided. As an alternative to the synthesis of β,δ,ζ-triketo-esters, diketo-dioxinones were also found to undergo cycloaromatization with retention of the ketal entity via a nonketene pathway. Finally, diketo-dioxinones with an allyl, prenyl, geranyl, or other 2-alkenyl carboxylate esters at the γ-carbon underwent decarboxylative rearrangement with tetrakis(triphenylphosphine)palladium catalysis to produce α-substituted diketo-dioxinones and resorcylates with 3-allyl, prenyl, geranyl, or other 2-alkenyl groups. Such diketo-dioxinone chemistry was used in the total synthesis of natural products including aigialomycin, cruentaren A, and the oligomeric resorcylate antibiotics ent-W1278 A, B, and C. Additionally, tandem use of the decarboxylative rearrangement process and cycloaromatization was used in the total synthesis of natural products including the methyl ester of cristatic acid, mycophenolic acid, and hongoquercin B. The methodology was also applied to the synthesis of 9,10-anthraquinones, o-aminoalkyl resorcylates, dihydroxyisoindolinones, oligomers, and resorcinamides. The development of this methodology is described in this Account, showcasing its applicability and versatility for the synthesis of complex resorcylate products.
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Affiliation(s)
- Rosa Cookson
- Department of Chemistry, Imperial College London, London SW7 2AZ, England
| | - Tim N. Barrett
- Department of Chemistry, Imperial College London, London SW7 2AZ, England
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Trivedi ER, Ma Z, Waters EA, Macrenaris KW, Subramanian R, Barrett AGM, Meade TJ, Hoffman BM. Synthesis and characterization of a porphyrazine-Gd(III) MRI contrast agent and in vivo imaging of a breast cancer xenograft model. Contrast Media Mol Imaging 2014; 9:313-22. [PMID: 24706615 DOI: 10.1002/cmmi.1577] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 09/05/2013] [Accepted: 09/17/2013] [Indexed: 11/10/2022]
Abstract
Porphyrazines (Pz), or tetraazaporphyrins, are being studied for their potential use in detection and treatment of cancer. Here, an amphiphilic Cu-Pz-Gd(III) conjugate has been prepared via azide-alkyne Huisgen cycloaddition or 'click' chemistry between an azide functionalized Pz and alkyne functionalized DOTA-Gd(III) analog for use as an MRI contrast agent. This agent, Cu-Pz-Gd(III), is synthesized in good yield and exhibits solution-phase ionic relaxivity (r1 = 11.5 mM(-1) s(-1)) that is approximately four times higher than that of a clinically used monomeric Gd(III) contrast agent, DOTA-Gd(III). Breast tumor cells (MDA-MB-231) associate with Cu-Pz-Gd(III) in vitro, where significant contrast enhancement (9.336 ± 0.335 contrast-to-noise ratio) is observed in phantom cell pellet MR images. This novel contrast agent was administered in vivo to an orthotopic breast tumor model in athymic nude mice and MR images were collected. The average T1 of tumor regions in mice treated with 50 mg kg(-1) Cu-Pz-Gd(III) decreased relative to saline-treated controls. Furthermore, the decrease in T1 was persistent relative to mice treated with the monomeric Gd(III) contrast agent. An ex vivo biodistribution study confirmed that Cu-Pz-Gd(III) accumulates in the tumors and is rapidly cleared, primarily through the kidneys. Differential accumulation and T1 enhancement by Cu-Pz-Gd(III) in the tumor's core relative to the periphery offer preliminary evidence that this agent would find application in the imaging of necrotic tissue.
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Affiliation(s)
- Evan R Trivedi
- Department of Chemistry, Northwestern University, Evanston, IL, USA; Department of Molecular Biosciences, Northwestern University, Evanston, IL, USA
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Affiliation(s)
- Tim N. Barrett
- Department of Chemistry, Imperial College London, London SW7 2AZ, England
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Reid S, Barrett AGM, Hill MS, Procopiou PA. Heavier Alkaline Earth Catalyzed Ene-yne Cyclizations: Atom-Efficient Access to Tetrahydroisoquinoline Frameworks. Org Lett 2014; 16:6016-9. [DOI: 10.1021/ol502600g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephanie Reid
- Department
of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K
| | - Anthony G. M. Barrett
- Department
of Chemistry, Imperial College London, Exhibition Road, South Kensington, London SW7 2AZ, U.K
| | - Michael S. Hill
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Panayiotis A. Procopiou
- GlaxoSmithKline Medicines Research Center, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
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31
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Brookes PA, Barrett AGM. Iodoaromatization Reactions of Enyne–Dioxinones: Syntheses of 4H-1,3-Benzodioxin-4-ones, Masked Pentasubstituted Arenes. J Org Chem 2014; 79:8706-14. [DOI: 10.1021/jo5015068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul A. Brookes
- Department of Chemistry, Imperial College London, London SW7 2AZ, England
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Loerbroks C, Böker B, Cordes J, Barrett AGM, Thiel W. Spiroaminals - Crystal Structure and Computational Investigation of Conformational Preferences and Tautomerization Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402576] [Citation(s) in RCA: 3] [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: 11/09/2022]
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Cookson R, Pöverlein C, Lachs J, Barrett AGM. Synthetic Studies towards Radicicol through Biomimetic Macrolactonization and Transannular Aromatization Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402205] [Citation(s) in RCA: 8] [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: 11/07/2022]
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Affiliation(s)
- Jens Cordes
- Department of Chemistry, Imperial College London, London SW7 2AZ, U.K
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Kaliszczak M, Patel H, Kroll SHB, Carroll L, Smith G, Delaney S, Heathcote DA, Bondke A, Fuchter MJ, Coombes RC, Barrett AGM, Ali S, Aboagye EO. Development of a cyclin-dependent kinase inhibitor devoid of ABC transporter-dependent drug resistance. Br J Cancer 2013; 109:2356-67. [PMID: 24071597 PMCID: PMC3817326 DOI: 10.1038/bjc.2013.584] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [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] [Revised: 08/30/2013] [Accepted: 09/04/2013] [Indexed: 01/15/2023] Open
Abstract
Background: Cyclin-dependent kinases (CDKs) control cell cycle progression, RNA transcription and apoptosis, making them attractive targets for anticancer drug development. Unfortunately, CDK inhibitors developed to date have demonstrated variable efficacy. Methods: We generated drug-resistant cells by continuous low-dose exposure to a model pyrazolo[1,5-a]pyrimidine CDK inhibitor and investigated potential structural alterations for optimal efficacy. Results: We identified induction of the ATP-binding cassette (ABC) transporters, ABCB1 and ABCG2, in resistant cells. Assessment of features involved in the ABC transporter substrate specificity from a compound library revealed high polar surface area (>100 Å2) as a key determinant of transporter interaction. We developed ICEC-0782 that preferentially inhibited CDK2, CDK7 and CDK9 in the nanomolar range. The compound inhibited phosphorylation of CDK substrates and downregulated the short-lived proteins, Mcl-1 and cyclin D1. ICEC-0782 induced G2/M arrest and apoptosis. The permeability and cytotoxicity of ICEC-0782 were unaffected by ABC transporter expression. Following daily oral dosing, the compound inhibited growth of human colon HCT-116 and human breast MCF7 tumour xenografts in vivo by 84% and 94%, respectively. Conclusion: We identified a promising pyrazolo[1,5-a]pyrimidine compound devoid of ABC transporter interaction, highly suitable for further preclinical and clinical evaluation for the treatment of cancer.
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Affiliation(s)
- M Kaliszczak
- Faculty of Medicine, Department of Surgery and Cancer, Imperial College London, Hammersmith Hospital Campus, Du Cane Road, London W12 0NN, UK
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George NS, Anderson KE, Barrett AGM. Total Synthesis of Cristatic Acid Based on Late-Stage Decarboxylative Allylic Migration and Biomimetic Aromatization of a Diketo Dioxinone. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301102] [Citation(s) in RCA: 9] [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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Brookes PA, Cordes J, White AJP, Barrett AGM. Total Synthesis of Mycophenolic Acid by a Palladium-Catalyzed Decarboxylative Allylation and Biomimetic Aromatization Sequence. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300974] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Cordes J, Barrett AGM. Synthesis of Macrosporin and Related 9,10-Anthraquinones by Biomimetic Polyketide Aromatization and Cyclization of 6-Benzylresorcylates. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201480] [Citation(s) in RCA: 15] [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: 11/09/2022]
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Affiliation(s)
- Bhavesh H. Patel
- Department of Chemistry, Imperial College, London SW7 2AZ, England
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Rey J, Hu H, Kyle F, Lai CF, Buluwela L, Coombes RC, Ortlund EA, Ali S, Snyder JP, Barrett AGM. Back Cover: Discovery of a New Class of Liver Receptor Homolog-1 (LRH-1) Antagonists: Virtual Screening, Synthesis and Biological Evaluation (ChemMedChem 11/2012). ChemMedChem 2012. [DOI: 10.1002/cmdc.201290058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Affiliation(s)
- Christine Brinkmann
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington,
London, SW7 2AZ U.K
| | - Anthony G. M. Barrett
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington,
London, SW7 2AZ U.K
| | - Michael S. Hill
- Department
of Chemistry, University of Bath, Claverton
Down, Bath, BA2 7AY U.K
| | - Panayiotis A. Procopiou
- GlaxoSmithKline Medicines Research Center, Gunnels Wood Road, Stevenage, Hertfordshire,
SG1 2NY U.K
| | - Stephanie Reid
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington,
London, SW7 2AZ U.K
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Rey J, Hu H, Kyle F, Lai CF, Buluwela L, Coombes RC, Ortlund EA, Ali S, Snyder JP, Barrett AGM. Discovery of a new class of liver receptor homolog-1 (LRH-1) antagonists: virtual screening, synthesis and biological evaluation. ChemMedChem 2012; 7:1909-14. [PMID: 22961990 DOI: 10.1002/cmdc.201200307] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [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: 06/20/2012] [Indexed: 11/09/2022]
Abstract
Targeting LRH-1: Virtual screening and molecular modeling were used to identify novel antagonists of liver receptor homolog-1 (LRH-1), an emerging therapeutic target for breast cancer. Hit compounds were synthesized and biologically assayed, and the preliminary results suggest that raloxifene-based analogues, substituted at the position C-7 of the benzothiophene ring, might generate an inactive protein conformation through binding and thus antagonize this nuclear receptor.
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Affiliation(s)
- Jullien Rey
- Department of Chemistry, Imperial College London, London, SW7 2AZ (England)
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Rey J, O'Riordan TJC, Hu H, Snyder JP, White AJP, Barrett AGM. Design and Diastereoselective Synthesis of C-2,C-20-Diaryl Steroidal Derivatives. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200190] [Citation(s) in RCA: 3] [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: 11/12/2022]
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Cordes J, Laclef S, White AJP, Barrett AGM. Palladium(0)-Catalyzed Allylic Alkylation of Diketoester–Dioxinones with Allyl Acetates under Neutral Conditions: Synthesis of Hexasubstituted Benzene Derivatives. J Org Chem 2012; 77:3524-30. [DOI: 10.1021/jo300340c] [Citation(s) in RCA: 16] [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: 11/28/2022]
Affiliation(s)
- Jens Cordes
- Department
of Chemistry, Imperial College, London
SW7 2AZ, England
| | - Sylvain Laclef
- Department
of Chemistry, Imperial College, London
SW7 2AZ, England
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Affiliation(s)
- Marianne Fouché
- Department of Chemistry, Imperial College, London SW7 2AZ, England
| | - Lisa Rooney
- Novartis, Wimblehurst Road, Horsham, West Sussex RH12 5AB, England
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Brinkmann C, Barrett AGM, Hill MS, Procopiou PA. Heavier Alkaline Earth Catalysts for the Intermolecular Hydroamination of Vinylarenes, Dienes, and Alkynes. J Am Chem Soc 2012; 134:2193-207. [DOI: 10.1021/ja209135t] [Citation(s) in RCA: 164] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christine Brinkmann
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington,
London SW7 2AZ, U.K
| | - Anthony G. M. Barrett
- Department of Chemistry, Imperial College London, Exhibition Road, South Kensington,
London SW7 2AZ, U.K
| | - Michael S. Hill
- Department
of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, U.K
| | - Panayiotis A. Procopiou
- GlaxoSmithKline Medicines Research Center, Gunnels Wood Road, Stevenage, Hertfordshire
SG1 2NY, U.K
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48
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Cordes J, Calo F, Anderson K, Pfaffeneder T, Laclef S, White AJP, Barrett AGM. Total Syntheses of Angelicoin A, Hericenone J, and Hericenol A via Migratory Prenyl- and Geranylation–Aromatization Sequences. J Org Chem 2011; 77:652-7. [DOI: 10.1021/jo202354j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jens Cordes
- Department
of Chemistry, Imperial College, London,
SW7 2AZ, England
| | - Frederick Calo
- Department
of Chemistry, Imperial College, London,
SW7 2AZ, England
| | - Katie Anderson
- Department
of Chemistry, Imperial College, London,
SW7 2AZ, England
| | - Toni Pfaffeneder
- Department
of Chemistry, Imperial College, London,
SW7 2AZ, England
| | - Sylvain Laclef
- Department
of Chemistry, Imperial College, London,
SW7 2AZ, England
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49
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Jones EP, Jones P, White AJP, Barrett AGM. Asymmetric synthesis of quaternary aryl amino acid derivatives via a three-component aryne coupling reaction. Beilstein J Org Chem 2011; 7:1570-6. [PMID: 22238534 PMCID: PMC3252860 DOI: 10.3762/bjoc.7.185] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Accepted: 11/07/2011] [Indexed: 11/23/2022] Open
Abstract
A method was developed for the synthesis of α-alkyl, α-aryl-bislactim ethers in good to excellent yields and high diastereoselectivities, consisting of a facile one-pot procedure in which the aryl group is introduced by means of a nucleophilic addition to benzyne and the alkyl group by alkylation of a resultant benzylic anion. Hydrolysis of the sterically less hindered adducts gave the corresponding quaternary amino acids with no racemization, whereas hydrolytic ring opening gave the corresponding valine dipeptides from bulkier bislactims.
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Affiliation(s)
- Elizabeth P Jones
- Department of Chemistry, Imperial College London, London, SW7 2AZ, England
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50
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Jacques SA, Michaelis S, Gebhardt B, Blum A, Lebrasseur N, Larrosa I, White AJP, Barrett AGM. Studies on the Total Synthesis of Lactonamycin: Synthesis of the Fused Pentacyclic B-F Ring Unit. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101317] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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