Search results for "Aliphatic compound"

showing 10 items of 53 documents

2-(4-Toluidino)pyrimidine

1984

Aus der Kondensation von 4-Tolylguanidin (1) mil den β-Diketonen 2a-g gehen die 2-(4-Toluidino)pyrimidine 3a-g hervor, unter denen sich Vertreter mit antidiabetischer und antimykotischer Wirksamkeit befinden. Antidiabetic Agents, II: 2-(4-Toluidino)pyrimidines Condensations of 4-tolylguanidine (1) with the β-diketones 2a-g yield the 2-(4-toluidino)pyrimidines 3a-g which comprise compounds exhibiting antidiabetic and antimycotic activities.

Diketonechemistry.chemical_compoundPyrimidineChemistryStereochemistryYield (chemistry)AcetylacetoneDrug DiscoveryPharmaceutical ScienceAliphatic compoundMedicinal chemistryAntidiabetic agentsArchiv der Pharmazie
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Antimykotische wirkstoffe. XIX. 4,6-Disubstituierte 2-(cyanamino)pyrimidine

1985

Aus der Umsetzung von Dicyandiamid (1) mit β-Diketonen (2a-c) gehen die 2-Cyanaminopyrimidine (3a-c) hervor. Strukturtyp 3 wird durch spektroskopische Daten gestutzt, wahrend gleichzeitig eine 1-Cyan-2-imino-struktur (4) ausgeschlossen wird. Verbindung 3a zeigt fungistatische und nematizide Wirkungen. The reaction of city dicyandiamide (1) with β-diketones 2a-c leads to 2-(cyanoamino)pyrimidines 3a-c. Structure type 3 is supported by spectroscopic data, while at the same time a 1-cyano-2-imino structure (4) is excluded. Compound 3a exhibits fungistatic and nematicidal activity.

Diketonechemistry.chemical_compoundchemistryPyrimidineStereochemistryAcetylacetoneOrganic ChemistryStructure typeAliphatic compoundMedicinal chemistryJournal of Heterocyclic Chemistry
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Cycloaddition reactions. A new type of cycloadduct from a substituted 2-vinylthiophen and dmad

1987

Abstract Cycloaddition reactions between 2-(1-cyanoallyl)thiophen and the dienophiles diethyl azodicarboxylate, N-phenylmaleimide , methyl propiolate, and dimethyl acetylenedicarboxylate are reported. Products include simple benzo[b] thiophen carboxylates (13,19) and reduced derivatives (8,9,10,12,18), as a mixture of diastereoisomers, except in the adduct with diethyl azodicarboxylate. With dimethyl acetylenedicarboxylate a new type of tricyclic compound was also found (20).

Dimethyl acetylenedicarboxylateBicyclic moleculeOrganic ChemistryDiastereomerNuclear magnetic resonance spectroscopyBiochemistryCycloadditionAdductDiethyl azodicarboxylatechemistry.chemical_compoundchemistryDrug DiscoveryOrganic chemistryAliphatic compoundTetrahedron
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2-(N,N-Diethylaminomethyl)-6,7-trihydroquinolinyl-8-ylideneamine-Ni(ii) chlorides: application in ethylene dimerization and trimerization

2020

A series of Ni(II) complexes with the general formula [2-((NEt2)Me)-8-{N(Ar)}C9H8N]NiCl2, where Ar = 2,6-Me2C6H3 in Ni1, 2,6-Et2C6H3 in Ni2, 2,6-i-Pr2C6H3 in Ni3, 2,4,6-Me3C6H2 in Ni4, 2,6-Et2-4-MeC6H2 in Ni5, and 2,4,6-t-Bu3C6H2 in Ni6, has been prepared using a one-pot reaction of 2-(N,N-diethylaminomethyl)-6,7-dihydroquinolin-8(5H)-one with the corresponding aniline and nickel dichloride hexahydrate. The resultant complexes were characterized using elemental analysis and FT-IR spectroscopy, while the mononuclear Ni1 and Ni3 were also the subject of single-crystal X-ray diffraction study. On activation with MMAO, the complexes Ni1–Ni6 displayed good activity in ethylene oligomerization, f…

EthyleneNickel metallographyInduction periodAliphatic compoundsGeneral ChemistryBinary alloysMedicinal chemistryChlorine compoundsCatalysisCatalysisCatalyst selectivityAnilineEthylenechemistry.chemical_compoundAnilinechemistryElemental analysisCatalyst activityMaterials ChemistrySingle crystalsThermal stabilitySelectivitySpectroscopyDimerizationNew Journal of Chemistry
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Efficient microwave-assisted direct radiosynthesis of [(18)F]PR04.MZ and [(18)F]LBT999: selective dopamine transporter ligands for quantitative molec…

2009

Abstract PR04.MZ 8-(4-fluoro-but-2-ynyl)-3- p -tolyl-8-aza-bicyclo[3.2.1]octane-2-carboxylic acid methyl ester ( 1 ) and LBT999 8-(( E )-4-fluoro-but-2-enyl)-3b- p -tolyl-8-aza-bicyclo[3.2.1]octane-2β-carboxylic acid methyl ester ( 2 ) are selective dopamine reuptake inhibitors, derived from cocaine. Compounds 1 and 2 were labelled with fluorine-18 at their terminally fluorinated N-substituents employing microwave enhanced direct nucleophilic fluorination. K[ 18 F]F − Kryptofix ® 222 cryptate, tetrabutyl ammonium [ 18 F]fluoride and caesium [ 18 F]fluoride were compared as fluoride sources under conventional and microwave enhanced conditions. Fluorination yields were remarkably increased un…

Fluorine RadioisotopesStereochemistryClinical BiochemistryPharmaceutical Sciencechemistry.chemical_elementCesiumLigandsBiochemistryChemical synthesischemistry.chemical_compoundFluoridesNucleophileCocaineDrug DiscoveryMicrowavesMolecular BiologyDopamine Plasma Membrane Transport ProteinsLigandOrganic ChemistryRadiosynthesischemistryModels ChemicalCaesiumIsotope LabelingPositron-Emission TomographyMolecular MedicineRadiopharmaceuticalsSelectivityAliphatic compoundFluorideNuclear chemistryTropanesBioorganicmedicinal chemistry
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Untersuchungen zur Konformation von 2‐Diazo‐1,3‐diketonen

1988

Mit Hilfe von 1H- und 13C-NMR-Messungen in Losung (und im Festkorper) werden die Konformationen von 2-Diazo-1,3-diketonen (2a–f) mit sperrigen Resten untersucht. Investigation on the Conformation of 2-Diazo-1,3-diketones Conformational analyses of 2-diazo-1,3-diketones (2a–f) with bulky substituents are performed by applying 1H- and 13C-NMR measurements in solution (and in solid state).

Inorganic ChemistryDiketoneChemistryStereochemistryPolymer chemistrySolid-stateChemical solutionNuclear magnetic resonance spectroscopyAliphatic compoundChemische Berichte
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Kinetische Untersuchungen zur Bildung der E ‐ und Z ‐Enole bei der Thermolyse von 2‐Diazo‐1,3‐dimesityl‐1,3‐propandion in Nucleophilen

1988

Bei der Thermolyse der Diazoverbindung 1 in Ethanol bzw. Piperidin oder Morpholin entstehen die Enole 3a–c von β-Ketocarbonsaurederivaten. Z- und E-Konfigurationen stehen miteinander im Gleichgewicht. Die Bestimmung der Geschwindigkeits-konstanten zeigt, das sich zunachst bevorzugt die Z-Formen bilden; im Gleichgewicht dominieren jedoch schlieslich in den Thermolysemedien die E-Isomeren. In aprotischen, apolaren oder masig polaren Medien uberwiegen dagegen die Z-Isomeren mit einer intramolekularen Wasserstoffbrucke. Investigation on the Kinetics of the Formation of E- and Z-Enols in the Thermolysis of 2-Diazo-1,3-propanedione in Nucleophiles Thermolysis of the diazo compound 1 in ethanol an…

Inorganic ChemistryDiketonechemistry.chemical_compoundchemistryNucleophileStereochemistryIntramolecular forceMorpholineDiazoPiperidineAliphatic compoundMedicinal chemistryEnolChemische Berichte
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Untersuchungen zur Diastereoselektivität beim O ‐Angriff von Elektrophilen auf β‐Ketocarbonsäureester‐Enolate

1989

Aus den in reiner Form eingesetzten Z- oder E-Enolen 2a–c werden uber die Enolatstufe 3a–c die O-alkylierten, -silylierten oder -acylierten Produkte 4aa–ae, 4ba, bf und 4ca, cc, cf hergestellt. Im Gegensatz zu der vollstandigen Regioselektivitat hangt die Z/E-Diastereoselektivitat dabei von den Substituenten in 2/3, dem verwendeten Elektrophil und den Reaktionsbedingungen ab. Insbesondere bei weichen Elektrophilen kann sich das Z/E-Verhaltnis bei der Umsetzung 34 stark andern. On the Diastereoselectivity of the O-Attack of Electrophiles on Enolates from β-Ketocarboxylates The O-alkylated, -silylated or -acylated derivatives 4aa–ae, 4ba, bf, 4ca, cc, cf of the pure Z or E enoles 2a–c are gen…

Inorganic ChemistryReaction conditionschemistry.chemical_classificationStereochemistryChemistryElectrophileEnol etherRegioselectivityAliphatic compoundChemische Berichte
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Untersuchungen zur Konfigurationsstabilität von Enolaten aus β‐Ketocarbonsäureestern

1988

Z- und E-Enole von β-Ketocarbonsaurederivaten 1a–c werden vollstandig und irreversibel deprotoniert, wobei unter Konfigurationserhalt (kinetische Kontrolle) die Enolate 2a–c entstehen. Abhangig von Gegenionen (Li, Na, K), Medium (THF, HMPT) und Temperatur kann anschliesend eine Z/E-Aquilibrierung eintreten. Auf dieser Basis last sich die Synthese von Enolethern und Enolestern auf die gewunschte Konfiguration hinsteuern. Investigations on the Stability of the Configuration of Enolates from β-ketocarboxylic Acid Esters Z- and E-enoles of β-ketocarboxylic acid esters 1a–c are completely and irreversibly deprotonated yielding the enolates 2a–c under retention of the configuration (kinetic contr…

Inorganic ChemistrySolventchemistry.chemical_compoundDeprotonationchemistryStereochemistryNuclear magnetic resonance spectroscopyTemperature aAliphatic compoundEnolMedicinal chemistryKinetic controlChemische Berichte
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The dimerization of substituted 3-TMSO-1-alkynes with (φ3P)3RhCl

1987

Abstract 3-Trimethylsilyloxy-1-alkynes were prepared from 3-hyroxy-1-alkynes and dimerized with (φ3P)3RhCl as a catalyst. The influence of a steric effect on the rates of dimerization is demonstrated.

Inorganic ChemistrySteric effectschemistry.chemical_compoundChemistryPolymer chemistryMaterials ChemistryOrganic chemistryNuclear magnetic resonance spectroscopyPhysical and Theoretical ChemistryTriphenylphosphineAliphatic compoundCatalysisInorganica Chimica Acta
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