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Roca-López D, Polo V, Tejero T, Merino P. Mechanism Switch in Mannich-Type Reactions: ELF and NCI Topological Analyses of the Reaction between Nitrones and Lithium Enolates. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500447] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gültekin Z, Civan M, Frey W, Hökelek T. Methyl 2-[(3RS,4RS)-3-phenyl-4-(phenyl-sulfon-yl)isoxazolidin-2-yl]acetate. Acta Crystallogr Sect E Struct Rep Online 2014; 70:o728-o729. [PMID: 24940296 PMCID: PMC4051012 DOI: 10.1107/s1600536814012161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Accepted: 05/26/2014] [Indexed: 06/03/2023]
Abstract
In the title compound, C18H19NO5S, the five-membered isoxazolidine ring is in a half-chair conformation, and the phenyl rings are oriented at a dihedral angle of 66.53 (3)°. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional supra-molecular structure. A weak C-H⋯π inter-action is also observed between adjacent mol-ecules.
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Affiliation(s)
- Zeynep Gültekin
- Department of Chemistry, Çankırı Karatekin University, TR-18100 Çankırı, Turkey
| | - Mehmet Civan
- Department of Physics, Hacettepe University, 06800 Beytepe, Ankara, Turkey
| | - Wolfgang Frey
- Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Tuncer Hökelek
- Department of Physics, Hacettepe University, 06800 Beytepe, Ankara, Turkey
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Diez-Martinez A, Tejero T, Merino P. Experimental and theoretical studies on Mannich-type reactions of chiral non-racemic N-(benzyloxyethyl) nitrones. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.12.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Romeo G, Chiacchio U, Corsaro A, Merino P. Chemical Synthesis of Heterocyclic−Sugar Nucleoside Analogues. Chem Rev 2010; 110:3337-70. [PMID: 20232792 DOI: 10.1021/cr800464r] [Citation(s) in RCA: 183] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Giovanni Romeo
- Dipartimento Farmaco-Chimico, Università di Messina, Via SS Annunziata, 98168 Messina, Italy, Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy, and Laboratorio de Sintesis Asimetrica, Departamento de Quimica Organica, Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza, CSIC, E-50009 Zaragoza, Aragon, Spain, Pedro Merino:
| | - Ugo Chiacchio
- Dipartimento Farmaco-Chimico, Università di Messina, Via SS Annunziata, 98168 Messina, Italy, Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy, and Laboratorio de Sintesis Asimetrica, Departamento de Quimica Organica, Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza, CSIC, E-50009 Zaragoza, Aragon, Spain, Pedro Merino:
| | - Antonino Corsaro
- Dipartimento Farmaco-Chimico, Università di Messina, Via SS Annunziata, 98168 Messina, Italy, Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy, and Laboratorio de Sintesis Asimetrica, Departamento de Quimica Organica, Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza, CSIC, E-50009 Zaragoza, Aragon, Spain, Pedro Merino:
| | - Pedro Merino
- Dipartimento Farmaco-Chimico, Università di Messina, Via SS Annunziata, 98168 Messina, Italy, Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125 Catania, Italy, and Laboratorio de Sintesis Asimetrica, Departamento de Quimica Organica, Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza, CSIC, E-50009 Zaragoza, Aragon, Spain, Pedro Merino:
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Domingo LR, Arnó M, Merino P, Tejero T. A DFT Study of the Molecular Mechanisms of the Nucleophilic Addition of Ester-Derived Lithium Enolates and Silyl Ketene Acetals to Nitrones: Effects of the Lewis Acid Catalyst. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600105] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Cushman M, Sambaiah T, Jin G, Illarionov B, Fischer M, Bacher A. Design, Synthesis, and Evaluation of 9-d-Ribitylamino-1,3,7,9-tetrahydro-2,6,8-purinetriones Bearing Alkyl Phosphate and α,α-Difluorophosphonate Substituents as Inhibitors of Riboflavin Synthase and Lumazine Synthase. J Org Chem 2004; 69:601-12. [PMID: 14750781 DOI: 10.1021/jo030278k] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lumazine synthase and riboflavin synthase catalyze the last two steps in the biosynthesis of riboflavin, an essential metabolite that is involved in electron transport processes. To obtain structural probes of these two enzymes, as well as inhibitors of potential value as antibiotics, a series of ribitylpurinetriones bearing alkyl phosphate and alpha,alpha-difluorophosphonate substituents were synthesized. Since the purinetrione ring system and the ribityl hydroxyl groups can be alkylated, the synthesis required the generation of these two moieties in protected form before the desired alkylation reaction could be carried out. These substances were designed as intermediate analogue inhibitors of lumazine synthase that would bind to its phosphate-binding site. All of the compounds were found to be effective inhibitors of both Bacillus subtilis lumazine synthase as well as Escherichia coli riboflavin synthase. Molecular modeling of the binding of 3-(1,3,7,9-tetrahydro-9-D-ribityl-2,6,8-trioxopurin-7-yl)propane 1-phosphate provided a structural explanation for how these compounds are able to effectively inhibit both enzymes. Interestingly, the enzyme kinetics of these new compounds in comparison with the parent purinetrione demonstrated unexpectedly that the phosphate and phosphonate substituents contributed negatively to the binding. A possible explanation for these effects on lumazine synthase would be that the inorganic phosphate in the assay buffer competes with the substituted purinetriones for binding to the enzyme. This would be consistent with the observed increase in K(m) of the 3,4-dihydroxybutanone-4-phosphate substrate from 5.2 microM in Tris buffer or from 6.7 microM in MOPS buffer to 50 microM in phosphate buffer when tested on Bacillus subtilis lumazine synthase. However, when tested in Tris buffer vs Mycobacterium tuberculosis lumazine synthase, three of the phosphate inhibitors displayed inhibition constants in the 4-5 nM range, indicating that they are much more potent than the parent purinetrione. Under these conditions, the phosphate moieties of the inhibitors do contribute positively to their binding. The alpha,alpha-difluorophosphonate analogue, which is expected to have enhanced metabolic stability relative to the phosphates, was also found to be an inhibitor of Mycobacterium tuberculosis lumazine synthase with a K(i) of 60 nM.
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Affiliation(s)
- Mark Cushman
- Department of Medicinal Chemistry and Molecular Pharmacology, School of Pharmacy and Pharmacal Sciences, Purdue University, West Lafayette, Indiana 47907, USA
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Michalik D, Feist H, Peseke K. Synthesis of derivatives of C-nucleoside analogues using 'push-pull' functionalized monosaccharides. Carbohydr Res 2001; 333:197-201. [PMID: 11448683 DOI: 10.1016/s0008-6215(01)00133-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
7-Deoxy-1,2:3,4-di-O-isopropylidene-alpha-D-galacto-heptopyranos-6-ulose (1) reacted with carbon disulphide and methyl iodide in the presence of a base to furnish 7,8-dideoxy-1,2:3,4-di-O-isopropylidene-8,8-[bis(methylthio)]-alpha-D-galacto-oct-7-enopyranos-6-ulose (2). This 'push-pull' activated unsaturated monosaccharide underwent a ring closure reaction with hydrazine hydrate to give the 'inversed' C-nucleoside analogue 3. Compound 1 and malononitrile yielded the 7-cyano-6,7-dideoxy-1,2:3,4-di-O-isopropylidene-6-methyl-alpha-D-galacto-oct-6-enopyranurononitrile (4). Treatment of 4 with carbon disulphide and methyl iodide in the presence of a base afforded the sugar 'push-pull' butadiene 5 which was transformed into the pyridine nucleoside analogue 6.
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Affiliation(s)
- D Michalik
- Fachbereich Chemie, Universität Rostock, D-18051 Rostock, Germany
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Merino P, del Alamo EM, Franco S, Merchan FL, Simon A, Tejero T. Stereoselective synthesis of l -isoxazolidinyl thymidine from N -benzyl-1,2-di- O -isopropylidene- d -glyceraldehyde nitrone (BIGN). ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00094-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ohtake H, Imada Y, Murahashi SI. Regioselective Synthesis of Nitrones by Decarboxylative Oxidation ofN-Alkyl-α-amino Acids and Application to the Synthesis of 1-Azabicyclic Alkaloids. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1999. [DOI: 10.1246/bcsj.72.2737] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Merino P, Franco S, Gascon JM, Merchan FL, Tejero T. Stereochemistry of α-(tert-butoxycarbonylamino) hydroxylamines: 1H NMR analysis of hydroxylamines derived from 2-pyrrolidinyl nitrones. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0957-4166(99)00202-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Merino P, Franco S, Gascon JM, Merchan FL, Tejero T. Highly diastereoselective nucleophilic addition of organometallic reagents to 2-pyrrolidinyl nitrones: a semiempirical approach. ACTA ACUST UNITED AC 1999. [DOI: 10.1016/s0957-4166(99)00203-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Merino P, Franco S, Merchan FL, Tejero T. Synthesis of isoxazolidin-5-ones via stereocontrolled Michael additions of benzylhydroxylamine to l-serine derived α,β-unsaturated esters. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0957-4166(98)00412-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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