1
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Abreshteh M, Ghazanfari D, Hassanabadi A, Rastakhiz N. Synthesis of 2-Aryl-7-Methyl-1-Phenyl-4-Thioxo-1,4-Dihydro-Pyrano[4,3-d]Pyrimidin-5-One via a Three-Component Condensation. Polycycl Aromat Compd 2023. [DOI: 10.1080/10406638.2023.2179077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Affiliation(s)
- Mina Abreshteh
- Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
| | - Dadkhoda Ghazanfari
- Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
| | - Alireza Hassanabadi
- Department of Chemistry, Zahedan Branch, Islamic Azad University, Zahedan, Iran
| | - Nahid Rastakhiz
- Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran
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2
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Talaei H, Mosslemin MH, Hassanabadi A, Mohebat R. Synthesis of 3-Aryl-4-phenyl-1-selenoxo-1,4-dihydro-9-oxa-2,4-diaza-phenanthren-10-ones via a One-pot Reaction. ORG PREP PROCED INT 2023. [DOI: 10.1080/00304948.2022.2151813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Hamed Talaei
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | | | - Alireza Hassanabadi
- Department of Chemistry, Zahedan Branch, Islamic Azad University, Zahedan, Iran
| | - Razieh Mohebat
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
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3
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Talaei H, Mosslemin MH, Hassanabadi A, Mohebat R. Synthesis of 2-Aryl-7-Methyl-1-Phenyl-4-Selenoxo-1,4-Dihydro-Pyrano[4,3-d]Pyrimidin-5-One via a Three-Component Condensation. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2086890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Hamed Talaei
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | | | - Alireza Hassanabadi
- Department of Chemistry, Zahedan Branch, Islamic Azad University, Zahedan, Iran
| | - Razieh Mohebat
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
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4
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Hadjam M, Bouchene R, Zaboub A, Mazouz W, Malki S, Bouchemma A. Synthesis, characterization, Hirshfeld surface analysis, DFT calculations and antibacterial activity evaluation of a new unsymmetrically substituted 1,3,5-triazacyclohexane. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Ehsanfar M, Mosslemin MH, Hassanabadi A. A simple and efficient one-pot route for the synthesis of 7-aryl-1,7a-dimethyl-2-phenyl-5-selenoxo-1,2,5,7a-tetrahydro-3H-pyrazolo[3,4-d]pyrimidin-3-ones. PHOSPHORUS SULFUR 2020. [DOI: 10.1080/10426507.2020.1799211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Majid Ehsanfar
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | | | - Alireza Hassanabadi
- Department of Chemistry, Zahedan Branch, Islamic Azad University, Zahedan, Iran
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6
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Shahroudi M, Zhiani R. Synthesis of 2-Selanylidene-1,9A-Dihydro-2H-Pyrido[1,2-A]Pyrimidine Derivatives. JOURNAL OF CHEMICAL RESEARCH 2018. [DOI: 10.3184/174751918x15320763089238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The reactive intermediate produced in the reaction between pyridines and acetylenic esters was trapped by aryl isoselenocyanates to afford 2-selanylidene-1,9a-dihydro-2H-pyrido[1,2-a]pyrimidine derivatives in good yields.
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Affiliation(s)
- Mina Shahroudi
- Department of Chemistry, Faculty of Science, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
- New Materials Technology and Processing Research Center, Department of Chemistry, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
| | - Rahele Zhiani
- Department of Chemistry, Faculty of Science, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
- New Materials Technology and Processing Research Center, Department of Chemistry, Neyshabur Branch, Islamic Azad University, Neyshabur, Iran
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7
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Singh S, Mosslemin MH, Hassanabadi A. Synthesis of 5-Aryl-1,3-Dimethyl-7-Selenoxopyrimidino[4,5- d]Pyrimidine-2,4(1 H,3 H)-Dione. JOURNAL OF CHEMICAL RESEARCH 2018. [DOI: 10.3184/174751918x15265512038216] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A one-pot method for the synthesis of six novel 5-aryl-1,3-dimethyl-7-selenoxopyrimidino[4,5- d]pyrimidine-2,4(1 H,3 H)-diones in excellent yields at room temperature has been achieved via reaction between potassium selenocyanate and an aroyl chloride followed by the addition of 6-amino- N,N′-dimethyluracil.
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Affiliation(s)
- Sonia Singh
- Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran
| | | | - Alireza Hassanabadi
- Department of Chemistry, Zahedan Branch, Islamic Azad University, Zahedan, Iran
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8
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Synthesis, characterization stereochemistry and anti-bacterial evaluation of certain N-acyl-c-3,t-3-dimethyl-r-2,c-6-diphenylpiperidin-4-ones. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.04.099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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9
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Koos MRM, Kummerlöwe G, Kaltschnee L, Thiele CM, Luy B. CLIP-COSY: A Clean In-Phase Experiment for the Rapid Acquisition of COSY-type Correlations. Angew Chem Int Ed Engl 2016; 55:7655-9. [DOI: 10.1002/anie.201510938] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 02/05/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Martin R. M. Koos
- Institut für Organische Chemie and Institut für Biologische, Grenzflächen 4-Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Grit Kummerlöwe
- Institut für Organische Chemie; Technische Universität München; Lichtenbergstrasse 4 85747 Garching Germany
| | - Lukas Kaltschnee
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Strasse 16 64287 Darmstadt Germany
| | - Christina M. Thiele
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Strasse 16 64287 Darmstadt Germany
| | - Burkhard Luy
- Institut für Organische Chemie and Institut für Biologische, Grenzflächen 4-Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
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10
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Koos MRM, Kummerlöwe G, Kaltschnee L, Thiele CM, Luy B. CLIP-COSY: Reine Inphase-Signale und schnelle Akquisition COSY-artiger Korrelationen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510938] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Martin R. M. Koos
- Institut für Organische Chemie und Institut für Biologische, Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
| | - Grit Kummerlöwe
- Institut für Organische Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Deutschland
| | - Lukas Kaltschnee
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 16 64287 Darmstadt Deutschland
| | - Christina M. Thiele
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 16 64287 Darmstadt Deutschland
| | - Burkhard Luy
- Institut für Organische Chemie und Institut für Biologische, Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Deutschland
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11
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Kowalkowska A, Jończyk A. [1,2] Stevens sigmatropic rearrangement of pyrrolidinium ylides—simple synthesis of 3-aryl-2-cyano-1-methylpiperidines. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.076] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Akhmetgareev AA, Bochkor SA, Kuznetsov VV. Conformational analysis of 3-methyltetrahydro-1,3-oxazine. RUSS J GEN CHEM+ 2014. [DOI: 10.1134/s1070363214100107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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13
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Lazareva NF, Shainyan BA, Schilde U, Chipanina NN, Oznobikhina LP, Albanov AI, Kleinpeter E. Synthesis, Molecular Structure, Conformational Analysis, and Chemical Properties of Silicon-Containing Derivatives of Quinolizidine. J Org Chem 2012; 77:2382-8. [DOI: 10.1021/jo202658n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nataliya F. Lazareva
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of the Russian Academy of Science, 1 Favorsky Street, 664033, Irkutsk, Russian
Federation
| | - Bagrat A. Shainyan
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of the Russian Academy of Science, 1 Favorsky Street, 664033, Irkutsk, Russian
Federation
| | - Uwe Schilde
- Institut für
Chemie, Universität Potsdam, Karl-Liebknecht-Strasse
24-25, D-14476 Potsdam (Golm), Germany
| | - Nina N. Chipanina
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of the Russian Academy of Science, 1 Favorsky Street, 664033, Irkutsk, Russian
Federation
| | - Larisa P. Oznobikhina
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of the Russian Academy of Science, 1 Favorsky Street, 664033, Irkutsk, Russian
Federation
| | - Alexander I. Albanov
- A. E. Favorsky Irkutsk Institute
of Chemistry, Siberian Division of the Russian Academy of Science, 1 Favorsky Street, 664033, Irkutsk, Russian
Federation
| | - Erich Kleinpeter
- Institut für
Chemie, Universität Potsdam, Karl-Liebknecht-Strasse
24-25, D-14476 Potsdam (Golm), Germany
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14
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Mohebat R, Mosslemin MH, Dehghan-Darehshiri A, Hassanabadi A. Three-component reaction between 6-amino-N, - dimethyluracil and ammonium thiocyanate in the presence of aroyl chlorides under solvent-free conditions. J Sulphur Chem 2011. [DOI: 10.1080/17415993.2011.619537] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Razieh Mohebat
- a Department of Chemistry , Islamic Azad University , Yazd Branch, PO Box 89195-155, Yazd , Iran
| | - Mohammad H. Mosslemin
- a Department of Chemistry , Islamic Azad University , Yazd Branch, PO Box 89195-155, Yazd , Iran
| | - Ali Dehghan-Darehshiri
- a Department of Chemistry , Islamic Azad University , Yazd Branch, PO Box 89195-155, Yazd , Iran
| | - Alireza Hassanabadi
- b Department of Chemistry , Islamic Azad University , Zahedan Branch, PO Box 98135-978, Zahedan , Iran
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15
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Döpp D, Fischer MA. [2 + 2] Photoaddition of 2-aminopropenenitriles to diarylethanediones. A product study. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19951141114] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Kolocouris A. The effect of spiroadamantane substitution on the conformational preferences of N-Me pyrrolidine and N-Me piperidine: a description based on dynamic NMR spectroscopy and ab initio correlated calculations. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.08.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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17
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Humeres E, Sun Lee B, Debacher NA. Mechanisms of Acid Decomposition of Dithiocarbamates. 5. Piperidyl Dithiocarbamate and Analogues. J Org Chem 2008; 73:7189-96. [DOI: 10.1021/jo801015t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eduardo Humeres
- Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Byung Sun Lee
- Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
| | - Nito Angelo Debacher
- Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, SC, Brazil
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18
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Yuan L, Sumpter BG, Abboud KA, Castellano RK. Links between through-bond interactions and assembly structure in simple piperidones. NEW J CHEM 2008. [DOI: 10.1039/b808818g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Locke JM, Crumbie RL, Griffith R, Bailey TD, Boyd S, Roberts JD. Probing Molecular Shape. 1. Conformational Studies of 5-Hydroxyhexahydropyrimidine and Related Compounds. J Org Chem 2007; 72:4156-62. [PMID: 17439182 DOI: 10.1021/jo0704863] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding the factors that determine molecular shape enables scientists to begin to understand and tailor molecular properties and reactivity. Many biomolecules and bioactive compounds contain aliphatic heterocyclic rings whose conformations play a major role in their biological activity. The interplay of a number of factors, both steric and electronic, is examined for 5-hydroxyhexahydropyrimidine (1) and related compounds with use of spectroscopy and molecular modeling.
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Affiliation(s)
- Julie M Locke
- University of Western Sydney, Campbelltown Campus, Penrith, NSW 1795, Australia
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20
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21
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Katritzky AR, Akhmedov NG, Myshakin EM, Verma AK, Dennis Hall C. Low-temperature 1H and 13C NMR spectra of N-substituted 1,2,3,4-tetrahydropyrazino[1,2-a]indoles. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:351-358. [PMID: 15724268 DOI: 10.1002/mrc.1553] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The temperature-dependent (1)H and (13)C NMR spectra of 2-(2-butynyl)-10-methyl-1,2,3,4-tetrahydropyrazino[1,2-a]indole (4) (as a representative example of 1-9) in CFCl(3) + CD(2)Cl(2) solution are described and discussed. Below 183 K, the hexahydropyrazine ring inversions become slow on the NMR time-scale and 4 exists in principle as two conformational diastereomers. In fact, only one was observed with the N-2 substituent in an equatorial position as shown by a low-temperature NOESY experiment. The energy barrier for conformational interchange was calculated from NMR data to be 8.3 kcal mol(-1) (1 kcal = 4.184 kJ), in agreement with quantum chemical calculations. Unambiguous assignments for all proton and carbon resonances of 1-9 were made using 1D (APT, DEPT, NOE difference) and 2D (COSY, NOESY, gHMQC, gHMBC) NMR techniques.
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Affiliation(s)
- Alan R Katritzky
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, USA.
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22
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Davies SG, Díez D, Dominguez SH, Garrido NM, Kruchinin D, Price PD, Smith AD. Cyclic beta-amino acid derivatives: synthesis via lithium amide promoted tandem asymmetric conjugate addition-cyclisation reactions. Org Biomol Chem 2005; 3:1284-301. [PMID: 15785819 DOI: 10.1039/b500223k] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The product distribution upon conjugate addition of homochiral lithium N-benzyl-N-alpha-methylbenzylamide to dimethyl-(E,E)-nona-2,7-dienedioate can be controlled to give either the cyclic 1,2-anti-1,6-anti-beta-amino ester (derived from conjugate addition and intramolecular enolate cyclisation) or the acyclic bis-beta-amino ester derivative (derived from double conjugate addition) in high de. The introduction of a protected nitrogen functionality into the diester skeleton facilitates, after conjugate addition and intramolecular enolate cyclisation, the asymmetric construction of piperidines in high de; variation in the N-protecting group indicates that the highest stereoselectivity is observed with alpha-branched N-substituents. Tandem conjugate addition-aldol reactions can also be achieved stereoselectively, with lithium amide conjugate addition to epsilon- and zeta-oxo-alpha,beta-unsaturated esters giving the corresponding five and six membered cyclic beta-amino esters in high de. N-deprotection by hydrogenolysis of the products arising from these reactions furnishes a range of polyfunctionalised transpentacin and transhexacin derivatives in high de and ee.
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Affiliation(s)
- Stephen G Davies
- Department of Organic Chemistry, University of Oxford, Chemical Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.
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23
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Alkorta I, Elguero J. A GIAO/DFT study of 1H, 13C and 15N shieldings in amines and its relevance in conformational analysis. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2004; 42:955-961. [PMID: 15386552 DOI: 10.1002/mrc.1460] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The 1H, 13C and 15N absolute shieldings of 13 amines were calculated at the GIAO/B3LYP/6-311++G** level. For some compounds (ethylamine, piperidine and 1-methylpiperidine) two conformations were calculated. The 13C and 15N data could be correctly correlated with experimental chemical shifts, allowing the conformation of 1-methylpiperidine to be established. The 1H NMR absolute shieldings, although less well correlated with delta values, were used to account for the anisotropy effects of the N lone pair.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain.
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24
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Kolocouris A, Tataridis D, Fytas G, Mavromoustakos T, Foscolos GB, Kolocouris N, De Clercq E. Synthesis of 2-(2-adamantyl)piperidines and structure anti-influenza virus A activity relationship study using a combination of NMR spectroscopy and molecular modeling. Bioorg Med Chem Lett 1999; 9:3465-70. [PMID: 10617092 DOI: 10.1016/s0960-894x(99)00631-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The 2-(2-adamantyl)piperidines 13 and 15a-c were synthesized and evaluated for anti-influenza virus A and B activity. The parent N-H compound 13 was 3-4 times more active than amantadine and rimantadine against H2N2 influenza A. N-alkylation of 13 resulted in derivatives 15a-c that were devoid of biological activity. This dramatic reduction in biological activity may be attributed to the different conformational properties between N-H and N-alkyl piperidines, as deduced from the combination of computational chemistry and NMR spectroscopy.
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Affiliation(s)
- A Kolocouris
- National Hellenic Research Foundation, Institute of Organic and Pharmaceutical Chemistry, Athens, Greece
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25
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Célanire S, Salliot-Maire I, Ribéreau P, Godard A, Quéguiner G. First synthesis of (±)-10β-hydroxy-13β-methylcyclohexa[a]quinolizidine. A convenient route to the ABC-part of 8-azasteroids. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00497-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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26
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Zoltewicz JA, Dill CD, Abboud KA. The Correct Structures of “Dihydrothiamine”. Resolution of a Long-Standing Controversy. J Org Chem 1997. [DOI: 10.1021/jo970782n] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John A. Zoltewicz
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
| | - Carlton D. Dill
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
| | - Khalil A. Abboud
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
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27
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Zoltewicz JA, Maier NM, Fabian WMF. Influence of the Position of an Annular Nitrogen Atom on the Magnitude of the Rotational Barriers in Atropisomers of 1,8-Dihetarylnaphthalenes. J Org Chem 1997; 62:3215-3219. [PMID: 11671706 DOI: 10.1021/jo961825n] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Five new atropisomerically chiral 1,8-dihetarylnaphthalenes were prepared by Pd(0)-catalyzed coupling reactions. Variable-temperature proton NMR spectra show those compounds with a 2'-pyridyl or 2'-pyrazinyl ring have a much lower energy barrier for rotation to interconvert conformational isomers than those with a 3'-pyridyl ring. Coalescence temperatures may differ by as much as 100 degrees C. The results of AM1 and PM3 computations indicate the preferred transition state for sigma-bond rotation places the annular nitrogen atom in the 2' or ortho position toward the face of the second hetaryl ring and not toward the naphthalene ring.
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Affiliation(s)
- John A. Zoltewicz
- Institut für Organische Chemie, Karl-Franzens Universität, A-8010 Graz, Austria
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28
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Senderowitz H, Fuchs B. Steric and stereoelectronic effects in saturated heterocycles I. Small molecular fragment constituents. Theory vs. experiment. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0166-1280(96)04957-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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29
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Okawara T, Ehara S, Kagotani H, Okamoto Y, Eto M, Harano K, Yamasaki T, Furukawa M. Preparation and Stereochemistry of Dioxatetraazaperhydroanthracenes and -perylenes from the Reaction of 2-Hydrazinoethanols with Aldehydes and Glutaraldehyde. J Org Chem 1996; 61:4125-4129. [PMID: 11667293 DOI: 10.1021/jo951878p] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrazinoethanols 1 were reacted with aldehydes 2 and 6 and glutaraldehyde (14) in aqueous solution to give dioxatetraazaperhydroanthracenes 3, 7, 12, and 13 and -perylenes 15 in yields of 19-88 and 42-72%, respectively. Compounds 3, 7, 12, and 15 were deduced by (13)C-NMR spectra to have two C(2) symmetry axes, while compound 12 was shown to have a symmetry axis by X-ray crystallography. The most favorable stereoisomers were consistent with predictions obtained by the semiempirical molecular orbital method AM1. The structure of compound 15 was confirmed by X-ray crystallography.
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Affiliation(s)
- Tadashi Okawara
- Faculty of Pharmaceutical Sciences, Kumamoto University, Oe-hon-machi, Kumamoto 862, Japan
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