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Bellido M, Riego-Mejías C, Diaz-Moreno A, Verdaguer X, Riera A. Enantioselective Ir-Catalyzed Hydrogenation of Terminal Homoallyl Sulfones: Total Synthesis of (-)-Curcumene. Org Lett 2023; 25:1453-1457. [PMID: 36857213 PMCID: PMC10013179 DOI: 10.1021/acs.orglett.3c00181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Indexed: 03/02/2023]
Abstract
A novel methodology for the preparation of chiral methyl benzylic compounds is reported. Terminal homoallyl sulfones were prepared from homoallyl alcohols, which are easily accessible through the recently reported Lewis acid isomerization of oxetanes. The iridium-catalyzed asymmetric hydrogenation of homoallylic sulfones afforded γ-chiral sulfones with excellent enantioselectivities (up to 98% ee). The synthetic potential of this novel methodology was demonstrated by the total synthesis of (R)-(-)-curcumene.
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Affiliation(s)
- Marina Bellido
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Carlos Riego-Mejías
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Alejandro Diaz-Moreno
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
| | - Xavier Verdaguer
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
- Departament
de Química Inorgànica i Orgànica, Secció
Química Orgànica, Universitat
de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
| | - Antoni Riera
- Institute
for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixach 10, 08028 Barcelona, Spain
- Departament
de Química Inorgànica i Orgànica, Secció
Química Orgànica, Universitat
de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
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2
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Marchal E, Figliola C, Thompson A. Prodigiosenes conjugated to tamoxifen and estradiol. Org Biomol Chem 2018. [PMID: 28628182 DOI: 10.1039/c7ob00943g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report the synthesis of the first click-appended prodigiosene conjugates. Four prodigiosene conjugates of estradiol functionalised at the 7α-position were prepared, as were three prodigiosene conjugates of tamoxifen. The coupling between a prodigiosene and an 11-hydroxy estradiol derivative via an ether linkage was investigated, as was the 11- and 7-functionalisation of the estradiol core. The robustness of estradiol protecting groups was severely challenged by reactions typically used to equip such frameworks for 11- and 7-functionalisation. Specifically, and important to synthesis involving estradiol, TBS, TMS and THP are not useful protecting groups for the functionalisation of this core. When the chemical features of the therapeutic agent limit the choice of protecting group (in this case, prodigiosenes bearing aryl, NH, alkenyl and ester groups), click chemistry becomes an attractive synthetic strategy. The anti-cancer activity of the seven click prodigiosene conjugates was evaluated.
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Affiliation(s)
- Estelle Marchal
- Department of Chemistry, Dalhousie University, PO BOX 15000, Halifax, NS B3H 4R2, Canada.
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3
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Studies toward brevisulcenal F via convergent strategies for marine ladder polyether synthesis. Tetrahedron 2018; 74:1111-1122. [PMID: 29479119 DOI: 10.1016/j.tet.2018.01.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Shortly after the initial isolation of marine ladder polyether natural products, biomimetic epoxide-opening cascade reactions were proposed as an efficient strategy for the synthesis of these compounds. However, difficulties in assembling the cascade precursors have limited the realization of these cascades. In this report, we describe strategies that provide convergent access to cascade precursors via regioselective allylation and efficient fragment coupling. We then investigate epoxide-opening cascades promoted by strong bases for the formation of fused tetrahydropyrans. These strategies are evaluated in the context of the synthesis of rings CDEFG of brevisulcenal F.
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Temple KJ, Wright EN, Fierke CA, Gibbs RA. Synthesis of Non-natural, Frame-Shifted Isoprenoid Diphosphate Analogues. Org Lett 2016; 18:6038-6041. [PMID: 27934359 DOI: 10.1021/acs.orglett.6b02977] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A set of synthetic approaches was developed and applied to the synthesis of eight frame-shifted isoprenoid diphosphate analogues. These analogues were designed to increase or decrease the methylene units between the double bonds and/or the pyrophosphate moieties of the isoprenoid structure. Evaluation of mammalian GGTase-I and FTase revealed that small structural changes can result in substantial changes in substrate activity.
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Affiliation(s)
- Kayla J Temple
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University , West Lafayette, Indiana 47907, United States
| | - Elia N Wright
- Departments of Biological Chemistry and Chemistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Carol A Fierke
- Departments of Biological Chemistry and Chemistry, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Richard A Gibbs
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University , West Lafayette, Indiana 47907, United States
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Temple KJ, Wright EN, Fierke CA, Gibbs RA. Exploration of GGTase-I substrate requirements. Part 2: Synthesis and biochemical analysis of novel saturated geranylgeranyl diphosphate analogs. Bioorg Med Chem Lett 2016; 26:3503-7. [PMID: 27342751 DOI: 10.1016/j.bmcl.2016.06.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 06/11/2016] [Accepted: 06/13/2016] [Indexed: 10/21/2022]
Abstract
Protein prenylation is a type of post-translational modification that aids certain proteins in localizing to the plasma member where they activate cell signaling. To better understand the isoprenoid requirements and differences of FTase and GGTase-I, a series of saturated geranylgeranyl diphosphate analogs were synthesized and screened against both mammalian FTase and GGTase-I. Of our library of compounds, several analogs proved to be substrates of GGTase-I, with 11d having a krel=0.95 when compared to GGPP (krel=1.0).
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Affiliation(s)
- Kayla J Temple
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA; The Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47909, USA.
| | - Elia N Wright
- Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Carol A Fierke
- Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, USA; Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Richard A Gibbs
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, USA; The Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47909, USA
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6
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Mostafavi AZ, Lujan DK, Erickson KM, Martinez CD, Troutman JM. Fluorescent probes for investigation of isoprenoid configuration and size discrimination by bactoprenol-utilizing enzymes. Bioorg Med Chem 2013; 21:5428-35. [PMID: 23816045 PMCID: PMC3758898 DOI: 10.1016/j.bmc.2013.06.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 05/28/2013] [Accepted: 06/05/2013] [Indexed: 10/26/2022]
Abstract
Undecaprenyl Pyrophosphate Synthase (UPPS) is an enzyme critical to the production of complex polysaccharides in bacteria, as it produces the crucial bactoprenol scaffold on which these materials are assembled. Methods to characterize the systems associated with polysaccharide production are non-trivial, in part due to the lack of chemical tools to investigate their assembly. In this report, we develop a new fluorescent tool using UPPS to incorporate a powerful fluorescent anthranilamide moiety into bactoprenol. The activity of this analogue in polysaccharide biosynthesis is then tested with the initiating hexose-1-phosphate transferases involved in Capsular Polysaccharide A biosynthesis in the symbiont Bacteroides fragilis and the asparagine-linked glycosylation system of the pathogenic Campylobacter jejuni. In addition, it is shown that the UPPS used to make this probe is not specific for E-configured isoprenoid substrates and that elongation by UPPS is required for activity with the downstream enzymes.
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Affiliation(s)
- Anahita Z. Mostafavi
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Blvd, Charlotte, NC 28223-0001
| | - Donovan K. Lujan
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Blvd, Charlotte, NC 28223-0001
| | - Katelyn M. Erickson
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Blvd, Charlotte, NC 28223-0001
| | - Christina D. Martinez
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Blvd, Charlotte, NC 28223-0001
| | - Jerry M. Troutman
- University of North Carolina at Charlotte, Department of Chemistry, 9201 University City Blvd, Charlotte, NC 28223-0001
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Subramanian T, Pais JE, Liu S, Troutman JM, Suzuki Y, Leela Subramanian K, Fierke CA, Andres DA, Spielmann HP. Farnesyl diphosphate analogues with aryl moieties are efficient alternate substrates for protein farnesyltransferase. Biochemistry 2012; 51:8307-19. [PMID: 22989235 DOI: 10.1021/bi3011362] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Farnesylation is an important post-translational modification essential for the proper localization and function of many proteins. Transfer of the farnesyl group from farnesyl diphosphate (FPP) to proteins is catalyzed by protein farnesyltransferase (FTase). We employed a library of FPP analogues with a range of aryl groups substituting for individual isoprene moieties to examine some of the structural and electronic properties of the transfer of an analogue to the peptide catalyzed by FTase. Analysis of steady-state kinetics for modification of peptide substrates revealed that the multiple-turnover activity depends on the analogue structure. Analogues in which the first isoprene is replaced with a benzyl group and an analogue in which each isoprene is replaced with an aryl group are good substrates. In sharp contrast with the steady-state reaction, the single-turnover rate constant for dansyl-GCVLS alkylation was found to be the same for all analogues, despite the increased chemical reactivity of the benzyl analogues and the increased steric bulk of other analogues. However, the single-turnover rate constant for alkylation does depend on the Ca(1)a(2)X peptide sequence. These results suggest that the isoprenoid transition-state conformation is preferred over the inactive E·FPP·Ca(1)a(2)X ternary complex conformation. Furthermore, these data suggest that the farnesyl binding site in the exit groove may be significantly more selective for the farnesyl diphosphate substrate than the active site binding pocket and therefore might be a useful site for the design of novel inhibitors.
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Affiliation(s)
- Thangaiah Subramanian
- Department of Molecular and Cellular Biochemistry, University of Kentucky, Lexington, KY 40536-0084, USA
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