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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 42 (1955), S. 46-47 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines, III. - Synthesis of 2-Aminodihydropyridines via Michael AdditionMichael addition of amidinoacetic esters 4 to alkylidene- or aralkylideneacetoacetic esters 1 is followed by ring closure to give novel 2-amino-1,4-dihydropyridine-3,5-dicarboxylates 10. 2-Amino-1,4-dihydropyridine-3-carboxylates 20 are obtained by addition of 4 to α,β-un-saturated ketones 17. Reaction of 3-amino-3-dialkylaminoacrylic esters 25 with 1 leads to 2-dialkylamino-3,4-dihydropyridine-3,5-dicarboxylates 27. Condensation of aldehydes 21, 1,3-cyclohexanedione and 4 yields 2-amino-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylates 23.
    Notes: Die Michael-Addition der Amidinoessigsäureester 4 an Alkylidene- oder Aralkylidenacetessigsäureester 1 führt unter Ringschluß zu 2-Amino-1,4-dihydropyridin-3,5-dicarbonsäure-ester 10. An α, β-ungesättigte Ketoverbindungen 17 wird 4 zu den 1,4-Dihydropyridin-3-carbonsäureestern 20 addiert. 3-Amino-3-dialkylaminoacrylsäureester 25 liefern mit 1 unter analogen Bedingungen die 2-Dialkylamino-3,4-dihydropyridine 27. Die Aldehyde 21, 1,3-Cyclohexandion und 4 kondensieren zu den teilhydrierten 2-Amino-5-oxochinolin-3-carbon-säureestern 23.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines, IV.  -  Condensation of Aldehydes with Enediaminocarbonyl CompoundsReaction of aldehydes 1 with double molar quantities of amidinoacetic esters 5 leads to the 2,6-diaminodihydropyridine-3,5-dicarboxylates 8. 2-Amino-6-dialkylamino-4,5-dihydropyridines 12 are obtained by condensation of 1 with 3-amino-3-dialkylaminoacrylic esters 11. Pyridones 17 with bridgehead nitrogen are formed by condensation of 1 with bridged enediaminocarbonyl compounds 15.
    Notes: Die Kondensation von Aldehyden 1 mit Amidinoessigsäureestern 5 im Molverhältnis 1:2 führt zu 2,6-Diaminodihydropyridin-3,5-dicarbonsäureestern 8. 3-Amino-3-dialkylaminoacrylsäureester 11 liefern mit 1 unter analogen Bedingungen die 2-Amino-6-dialkylamino-4,5-dihydropyridine 12. Dihydropyridone 17 mit Brückenkopf-N-Atom werden durch Kondensation von 1 mit den N,N′-verbrückten Endiaminocarbonsäureestern 15 erhalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines, I. -Synthesis of 6-Alkoxy-2-amino-4,5-dihydropyridine-3,5-dicarboxylatesCondensation of the aliphatic and aromatic aldehydes 1 with the 3-alkoxy-3-aminoacrylic esters 5a leads to the novel 6-alkoxy-2-amino-4,5-dihydropyridine-3,5-dicarboxylates 8, the structures of which are supported by their spectroscopic data.
    Notes: Die Kondensation der aliphatischen und aromatischen Aldehyde 1 mit den 3-Alkoxy-3-aminoacrylsäureestern 5a führt zu den 6-Alkoxy-2-amino-4,5-dihydropyridin-3,5-dicarbon-säureestern 8, deren spektroskopische Daten diskutiert werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines V.  -  Synthesis of AminodihydropyridonesMichael addition of amidinoacetic esters 1 to aralkylidene malonates 5 is followed by ring closure to 2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridine-3,5-dicarboxylates 11a-m. Analogous addition of 1 to ethyl cinnamate furnishes the monoester 13. 4-Aralkylidene-2-methyloxazole-5(4H)-ones 14 are attacked by 1 with subsequent opening of the oxazole ring leading to 5-acetylamino-2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylates 15a-c.
    Notes: Die cyclisierende Michael-Addition von Amidinoessigsäureestern 1 an die Aralkylidenmalonsäurediester 5 fährt zu den 2-Amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridin-3,5-dicarbonsäureestern 11a-m. Die analoge Addition an Zimtsäure-ethylester liefert den Monoester 13. An 4-Aralkyliden-2-methyloxazol-5(4H)-one 14 wird 1 unter nachfolgender Öffnung des Oxazolrings zu den 5-Acetylamino-2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridin-3-carbonsäureestern 15a-c addiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines, II - Synthesis of 1,4-Dihydropyridines with Bridgehead NitrogenMichael addition of enaminocarbonyl compounds 9 to alkylidene or aralkylideneacetoacetic esters 6 is followed by ring closure to novel 1,4-dihydropyridines 5 with bridgehead nitrogen. This modified Hantzsch pyridine synthesis also permits preparation of bridged dihydropyridines 10 with a 5-keto function by condensation of aldehydes, 1,3-cyclohexanedione and 9. Analogous bridged dihydropyridines 13 and 14 with 3- or 3,5-keto function, respectively, are obtained by use of octahydroquinolone 11 as enaminocarbonyl component.
    Notes: Die Michael-Addition der N-verbrückten Enaminocarbonylverbindungen 9 an die Alkyliden-oder Aralkylidenacetessigsäureester 6 führt in einer modifizierten Hantzsch-Pyridinsyhthese zu 1,4-Dihydropyridinen 5 mit Brückenkopf-N-Atom. Analoge verbrückte 1,4-Dihydro-pyridine 10 mit einer Ketofunktion werden durch Kondensation von Aldehyden, 1,3-Cyclohexandion und 9 erhalten. Wird anstelle von 9 Octahydrochinolon 11 als Enaminocarbonylkomponente verwendet. so entstehen die verbrückten 1,4-Dihydropyridine 13 und 14 mit Ketofunktionen in 3- bzw. 3,5-Stellung.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 93 (1981), S. 755-763 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die von Hantzsch vor nahezu hundert Jahren synthetisierten Aryldihydropyridine erwiesen sich in jüngerer Zeit als hochwirksame und gut verträgliche Calcium-Antagonisten. Paradebeispiel ist der bereits therapeutisch angewandte 1,4-Dihydro-2,6-dimethyl-4-(o-nitrophenyl)pyridin-3,5-dicarbonsäure-dimethylester (Nifedipine). Dieser Stoff setzt die Anfallshäufigkeit bei Angina pectoris herab und senkt den Blutdruck. Die Entdeckung der therapeutischen Wirksamkeit dieser Stoffklasse initiierte erneute Untersuchungen der Hantzsch-Kondensation sowie die Synthese zahlreicher 4-Aryldihydropyridine und verwandter Verbindungen. Aus ihren biologischen Daten lassen sich qualitative und quantitative Struktur-Wirkungs-Beziehungen ableiten.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 20 (1981), S. 762-769 
    ISSN: 0570-0833
    Keywords: 4-Aryldihydropyridines ; Pyridines ; Calcium antagonists ; Nifedipine ; Hantzsch synthesis ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The aryldihydropyridines first prepared by Hantzsch almost 100 years ago have recently been found to be highly effective calcium antagonists with suitable pharmacological profiles. An illustrative example is dimethyl-l,4-dihydro-2,6-dimethyl-4-(o-nitrophenyl)pyridine-3,5-dicarboxylate (Nifedipine) which is already employed therapeutically. This substance lowers the frequency of attack of angina pectoris and reduces blood pressure. The discovery of the therapeutic activity of this class of substances initiated renewed investigation of the Hantzsch condensation and the synthesis of numerous 4-aryldihydropyridines and related compounds. Qualitative and quantitative structure/activity relationships of these substances can be deduced from their biological data.
    Type of Medium: Electronic Resource
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