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Synthesis of 1,2,3-Triazolium Ionic Liquid-Supported Chiral Imidazolidinones and Their Application in Asymmetric Alkylation Reaction. Molecules 2019; 24:molecules24183349. [PMID: 31540061 PMCID: PMC6766834 DOI: 10.3390/molecules24183349] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 09/11/2019] [Accepted: 09/13/2019] [Indexed: 11/18/2022] Open
Abstract
New 1,2,3-triazolium ionic liquid-supported chiral imidazolidinones were developed. The feasibility of the ionic liquid-supported imidazolidinones as chiral auxiliaries was demonstrated in sequential propionylation-alkylation-cleavage reactions, which provided the chiral product with good to excellent chemical yields (up to 90%) and high selectivities (up to 94% ee). The progress of the reactions could be monitored by TLC and NMR, and the ionic liquid-supported chiral auxiliaries could be recovered by simple extraction.
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The structural requirements of histone deacetylase inhibitors: C4-modified SAHA analogs display dual HDAC6/HDAC8 selectivity. Eur J Med Chem 2017; 143:1790-1806. [PMID: 29150330 DOI: 10.1016/j.ejmech.2017.10.076] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 10/28/2017] [Accepted: 10/28/2017] [Indexed: 01/29/2023]
Abstract
Histone deacetylase (HDAC) enzymes govern the post-translational acetylation state of lysine residues on protein substrates, leading to regulatory changes in cell function. Due to their role in cancers, HDAC proteins have emerged as promising targets for cancer treatment. Four HDAC inhibitors have been approved as anti-cancer therapeutics, including SAHA (Suberoylanilide hydroxamic acid, Vorinostat, Zolinza). SAHA is a nonselective HDAC inhibitor that targets most of the eleven HDAC isoforms. The nonselectivity of SAHA might account for its clinical side effects, but certainly limits its use as a chemical tool to study cancer-related HDAC cell biology. Herein, the nonselective HDAC inhibitor SAHA was modified at the C4 position of the linker to explore activity and selectivity. Several C4-modified SAHA analogs exhibited dual HDAC6/8 selectivity. Interestingly, (R)-C4-benzyl SAHA displayed 520- to 1300-fold selectivity for HDAC6 and HDAC8 over HDAC1, 2, and 3, with IC50 values of 48 and 27 nM with HDAC6 and 8, respectively. In cellulo testing of the inhibitors was consistent with the observed in vitro selectivity. Docking studies provided a structural rationale for selectivity. The C4-SAHA analogs represent useful chemical tools to understand the role of HDAC6 and HDAC8 in cancer biology and exciting lead compounds for targeting of both HDAC6 and HDAC8 in various cancers.
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Kang BS, Kim TH. Asymmetric Alkylation Reactions Using Non-Cross-Linked Polystyrene-supported 2-Imidazolidinone Chiral Auxiliary Derived from l-Phenyl Alanine. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Byung Sun Kang
- School of Chemical Engineering, College of Engineering; Chonnam National University; Gwangju 500-757 Republic of Korea
| | - Taek Hyeon Kim
- School of Chemical Engineering, College of Engineering; Chonnam National University; Gwangju 500-757 Republic of Korea
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Nguyen QPB, Kim TH. Non-cross-linked polystyrene-supported 2-imidazolidinone chiral auxiliary: synthesis and application in asymmetric alkylation reactions. Beilstein J Org Chem 2013; 9:2113-9. [PMID: 24204423 PMCID: PMC3817508 DOI: 10.3762/bjoc.9.248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Accepted: 09/21/2013] [Indexed: 11/23/2022] Open
Abstract
Asymmetric alkylation reactions using non-cross-linked polystyrene (NCPS)-supported 2-imidazolidinone chiral auxiliaries were successfully investigated with excellent diastereocontrol (>99% de). The recovery and the recycling of this soluble polymer-supported chiral auxiliary were achieved in order to produce highly optical pure carboxylic acids.
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Affiliation(s)
- Quynh Pham Bao Nguyen
- School of Applied Chemistry and Center for Functional Nano Fine Chemicals, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Taek Hyeon Kim
- School of Applied Chemistry and Center for Functional Nano Fine Chemicals, Chonnam National University, Gwangju 500-757, Republic of Korea
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Brenna E, Fronza G, Fuganti C, Gatti FG, Manfredi A, Parmeggiani F, Ronchi P. On the stereochemistry of the Baker's Yeast-mediated reduction of regioisomeric unsaturated aldehydes: Examples of enantioselectivity switch promoted by substrate-engineering. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcatb.2012.02.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gansäuer A, Knebel K, Kube C, van Gastel M, Cangönül A, Daasbjerg K, Hangele T, Hülsen M, Dolg M, Friedrich J. Radical 4-exo Cyclizations via Template Catalysis. Chemistry 2012; 18:2591-9. [DOI: 10.1002/chem.201102959] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Indexed: 11/06/2022]
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Chelucci G, Marchetti M, Malkov AV, Friscourt F, Swarbrick ME, Kočovský P. New monoterpene-derived phosphinopyridine ligands and their application in the enantioselective iridium-catalyzed hydrogenation. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.075] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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8
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Gansäuer A, Greb A, Huth I, Worgull D, Knebel K. Formal total synthesis of (±)-fragranol via template catalyzed 4-exo cyclization. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Gansäuer A, Worgull D, Knebel K, Huth I, Schnakenburg G. 4-exo-Cyclisierungen durch Templatkatalyse. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904428] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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10
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Gansäuer A, Worgull D, Knebel K, Huth I, Schnakenburg G. 4-exoCyclizations by Template Catalysis. Angew Chem Int Ed Engl 2009; 48:8882-5. [DOI: 10.1002/anie.200904428] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lu WJ, Hou XL. Highly Enantioselective Construction of the α-Chiral Center of AmidesviaIridium-Catalyzed Hydrogenation of α,β-Unsaturated Amides. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900080] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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13
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Davies SG, Mulvaney AW, Russell AJ, Smith AD. Parallel synthesis of homochiral β-amino acids. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.06.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Spletstoser JT, White JM, Tunoori AR, Georg GI. Mild and selective hydrozirconation of amides to aldehydes using Cp2Zr(H)Cl: scope and mechanistic insight. J Am Chem Soc 2007; 129:3408-19. [PMID: 17315870 PMCID: PMC2626624 DOI: 10.1021/ja066362+] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An investigation of the use of Cp2Zr(H)Cl (Schwartz's reagent) to reduce a variety of amides to the corresponding aldehydes under very mild reaction conditions and in high yields is reported. A range of tertiary amides, including Weinreb's amides, can be converted directly to the corresponding aldehydes with remarkable chemoselectivity. Primary and secondary amides proved to be viable substrates for reduction as well, although the yields were somewhat diminished as compared to the corresponding tertiary amides. Results from NMR experiments suggested the presence of a stable, 18-electron zirconacycle intermediate that presumably affords the aldehyde upon water or silica gel workup. A series of competition experiments revealed a preference of the reagent for substrates in which the lone pair of the nitrogen is electron releasing and thus more delocalized across the amide bond by resonance. This trend accounts for the observed excellent selectivity for tertiary amides versus esters. Experiments regarding the solvent dependence of the reaction suggested a kinetic profile similar to that postulated for the hydrozirconation of alkenes and alkynes. Addition of p-anisidine to the reaction intermediate resulted in the formation of the corresponding imine mimicking the addition of water that forms the aldehyde.
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Affiliation(s)
- Jared T Spletstoser
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, USA
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Spletstoser JT, White JM, Tunoori AR, Georg GI. Mild and selective hydrozirconation of amides to aldehydes using Cp2Zr(H)Cl: scope and mechanistic insight. J Am Chem Soc 2007. [PMID: 17315870 DOI: 10.1021/ja066362] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An investigation of the use of Cp2Zr(H)Cl (Schwartz's reagent) to reduce a variety of amides to the corresponding aldehydes under very mild reaction conditions and in high yields is reported. A range of tertiary amides, including Weinreb's amides, can be converted directly to the corresponding aldehydes with remarkable chemoselectivity. Primary and secondary amides proved to be viable substrates for reduction as well, although the yields were somewhat diminished as compared to the corresponding tertiary amides. Results from NMR experiments suggested the presence of a stable, 18-electron zirconacycle intermediate that presumably affords the aldehyde upon water or silica gel workup. A series of competition experiments revealed a preference of the reagent for substrates in which the lone pair of the nitrogen is electron releasing and thus more delocalized across the amide bond by resonance. This trend accounts for the observed excellent selectivity for tertiary amides versus esters. Experiments regarding the solvent dependence of the reaction suggested a kinetic profile similar to that postulated for the hydrozirconation of alkenes and alkynes. Addition of p-anisidine to the reaction intermediate resulted in the formation of the corresponding imine mimicking the addition of water that forms the aldehyde.
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Affiliation(s)
- Jared T Spletstoser
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, USA
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Dib HH, Ibrahim MR, Al-Awadi NA, Ibrahim YA, Al-Awadi S. Gas-phase pyrolytic reaction of 3-phenoxy and 3-phenylsulfanyl-1-propanol derivatives: Kinetic and mechanistic study. INT J CHEM KINET 2007. [DOI: 10.1002/kin.20276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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McGhee AM, Kizirian JC, Procter DJ. Synthesis and evaluation of a new polymer-supported pseudoephedrine auxiliary for asymmetric alkylations on solid phase. Org Biomol Chem 2007; 5:1021-4. [PMID: 17377653 DOI: 10.1039/b700477j] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A polymer-supported pseudoephedrine auxiliary linked to the support through nitrogen, has been developed for use in asymmetric alkylations on solid phase.
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Affiliation(s)
- Andrea M McGhee
- School of Chemistry, Oxford Road, The University of Manchester, Manchester, UK
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Vicario JL, Badía D, Carrillo L, Etxebarria J, Reyes E, Ruiz N. THE ASYMMETRICAZA-MICHAEL REACTION. A REVIEW. ORG PREP PROCED INT 2005. [DOI: 10.1080/00304940509354981] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Etxebarria J, Vicario JL, Badia D, Carrillo L, Ruiz N. (S,S)-(+)-Pseudoephedrine as Chiral Auxiliary in Asymmetric Aza-Michael Reactions. Unexpected Selectivity Change when Manipulating the Structure of the Auxiliary. J Org Chem 2005; 70:8790-800. [PMID: 16238311 DOI: 10.1021/jo051207j] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] The asymmetric aza-Michael reaction of metal benzylamides to alpha,beta-unsaturated amides derived from the chiral amino alcohol (S,S)-(+)-pseudoephedrine has been studied in detail. A deep study of the most important experimental parameters (solvent, temperature, nucleophile structure, influence of additives) has been carried out, showing that the reaction usually proceeds with good yields and diastereoselectivities, although the experimental conditions have to be modified depending on the substitution pattern of the conjugate acceptor. Additionally, a very interesting facial selectivity inversion has been observed when manipulating the structure of the chiral auxiliary, which has allowed a diastereodivergent procedure to be set up for performing asymmetric aza-Michael reactions using the same chirality source. Finally, the adducts obtained in the asymmetric aza-Michael reaction have proven to be very versatile synthetic intermediates in the preparation of other interesting compounds such as beta-amino esters, gamma-amino alcohols, and beta-amino ketones in highly enantioenriched form.
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Affiliation(s)
- Juan Etxebarria
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Bilbao, Spain
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Hein JE, Hultin PG. Recyclable supports for stereoselective 1,3-dipolar cycloadditions: application of a fluorous oxazolidinone chiral auxiliary. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.tetasy.2005.05.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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21
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Rodríguez M, Vicario JL, Badía D, Carrillo L. (S,S)-(+)-pseudoephedrine as chiral auxiliary in asymmetric acetate aldol reactions. Org Biomol Chem 2005; 3:2026-30. [PMID: 15889187 DOI: 10.1039/b502995c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric acetate-type aldol reaction using (S,S)-(+)-pseudoephedrine has been studied in detail. Experimental variables like the nature of the metal counterion of the enolate, the presence of additives and the structure of the aldehyde have been examined in order to reach to the highest possible yields and diastereoselectivities.
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Affiliation(s)
- Mónica Rodríguez
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del Pais Vasco/Euskal Herriko Unibertsitatea, P.O. Box 644, 48080, Bilbao, Spain
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Kotake T, Hayashi Y, Rajesh S, Mukai Y, Takiguchi Y, Kimura T, Kiso Y. Design and synthesis of a new polymer-supported Evans-type oxazolidinone: an efficient chiral auxiliary in the solid-phase asymmetric alkylation reactions. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.01.135] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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McKerlie F, Rudkin IM, Wynne G, Procter DJ. Evaluation of a new linker system cleaved using samarium(ii) iodide. Application in the solid phase synthesis of carbonyl compounds. Org Biomol Chem 2005; 3:2805-16. [PMID: 16032358 DOI: 10.1039/b506294b] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new linker design for solid phase synthesis has been developed that is cleaved under mild, neutral conditions using samarium(II) iodide. The feasibility of the linker approach has been illustrated in the solid phase synthesis of ketones and amides using an oxygen linker. Insights into the mechanism of the samarium(II) iodide cleavage reaction are described and the potential of a sequential cleavage carbon-carbon bond forming process is assessed.
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Affiliation(s)
- Fiona McKerlie
- Department of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, UK G12 8QQ
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Kerrigan NJ, Hutchison PC, Heightman TD, Procter DJ. Development of a solid-phase ‘asymmetric resin-capture–release’ process: application of an ephedrine chiral resin in an approach to γ-butyrolactones. Org Biomol Chem 2004; 2:2476-82. [PMID: 15326528 DOI: 10.1039/b408836k] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potential of a solid-phase asymmetric resin-capture-release strategy for high-throughput synthesis has been evaluated. Fukuzawa's Sm(ii)-mediated, asymmetric approach to gamma-butyrolactones was selected to illustrate the feasibility of such a process. Alpha,beta-unsaturated esters immobilised on an ephedrine chiral resin have been applied in an asymmetric approach to gamma-butyrolactones. Lactone products are obtained in moderate isolated yields with selectivities up to 96% ee. In addition, we have shown that the ephedrine resin can be conveniently recovered and recycled although in some cases lower yields were obtained on reuse of the chiral resin. A short synthesis of a moderate DNA-binding microbial metabolite using asymmetric resin-capture-release is also described.
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Affiliation(s)
- Nessan J Kerrigan
- Department of Chemistry, University of Glasgow, The Joseph Black Building, Glasgow, UKG12 8QQ
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