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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: v-Triazoline, XXVIII. - Reaktionen von 1-Aryl-4,5-dihydro-4-methylen-5-morpholino-v-triazolen mit 2,4-Diaryl-5(4H)-oxazolonen5(4H)-Oxazolone 1a-d mit elektronenliefernden Resten in 2-Position des Arylrests reagieren mit 4,5-Dihydro-v-triazolen 2a-c zu 4-[(4-Triazolyl)methyl]-5-(4H)-oxazolonen 3a-i als Haupt- und zu 2,5-Diaryl-3-pyrrolcarbaldehyden 4a-d sowie Glycindiamiden 5a-d als Nebenprodukten. 5(4H)-Oxazolone mit elektronenziehenden Substituenten (1e-h) liefern mit den 4,5-Dihydro-v-triazolen 2c-e die 2-[(4-Triazolyl)methyl]-5(2H)-oxazolone 7a-e als Hauptprodukte. Die Produkte 3 und 7 werden durch nucleophilen Angriff des Anions von 1 am exo-Methylenkohlenstoff von 2 gebildet. Die Aldehyde 4 entstehen durch Umlagerung eines labilen Cycloaddukts aus 1 und 2.
    Notes: The 5(4H)-oxazolones 1a-d with an electron-rich aryl substituent on C-2 react with 4,5-dihydro-v-triazoles 2a-c to afford the 4-[(4-triazolyl)methyl]-5(4H)-oxazolones 3a-i as main reaction products and 2,5-diaryl-3-pyrrolecarbaldehydes 4a-d and glycine diamides 5a-d as secondary reaction products. The 5(4H)-oxazolones 1e-h bearing an electron-withdrawing substituent on the aryl group on C-2 react with the 4,5-dihydro-v-triazoles 2c-e affording the 2-[(4-triazolyl)methyl]-5(2H-oxazolones 7a-e as main reaction products. Compounds 3 and 7 are produced by nucleophilic attack of the anion of 1 at the exo methylene carbon. Aldehydes 4 are formed through rearrangement of an unstable cycloaddition product from 1 and 2.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Isoxazoles ; 5(4H)-Oxazolones ; 3-Pyridinecarbaldehydes, 1,4,5,6-tetrahydro-6-oxo ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 5(4H)-oxazolones 1a-e react with 5-morpholinoisoxazoles 2a-b to afford the 4-[(4-isoxazolyl)methyl]-5(4H)-oxazolones 3a-g. Compounds 3 are hydrogenated with Pd/C in dioxane to yield the corresponding 1,4,5,6-tetrahydro-6-oxo-3-pyridinecarbaldehydes 6a-d.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: v-Triazoline, XXIV.- Pyrazolcarbaldehyde aus 5-Amino-4,5-dihydro-4-methylen-v-triazolen und SydnonenDie Sydnone 1a- c ergeben mit den 4,5-Dihydro-v-triazolen 2a- c nach längerem Rückflußerhitzen auf 110- 140°C über nicht isolierbare Primäraddukte nach Eliminierung von CO2 und N2 sowie nach Umlagerung ein Gemisch der 4,5-Dihydropyrazole 3a- c, 3-Pyrazolcarbaldehyd-anile 4a-d und 3-Pyrazolcarbaldehyde 5a-c. Die Verbindungen 3 können zu 4 desaminiert werden, und letztere lassen sich zu 3-Pyrazolcarbaldehyden 5 hydrolysieren.- Die Sydnone 6a, b reagieren ähnlich mit 2a unter Bildung eines Gemisches von 4-Pyrazolcarbaldehyd-anilen 7a, b und 4-Pyrazolcarbaldehyden 8a, b. Die Strukturzuweisungen stützen sich auf spektroskopische Daten und Röntgenstrukturanalysen.
    Notes: The sydnones 1a-c react with the 4,5-dihydro-v-triazoles 2a-c by long refluxing at 110- 140°C affording via non-isolable adducts with elimination of CO2 and N2 and rearrangement a mixture of 4,5-dihydropyrazoles 3a- c, 3-pyrazolecarbaldehyde anils 4a-d, and 3-pyrazolecarbaldehydes 5a-c. Compounds 3 can be deaminated to give 4 which can be hydrolyzed to yield the 3-pyrazolecarbaldehydes 5.- The sydnones 6a, b react similarly with 2a to give a mixture of 4-pyrazolecarbaldehyde anils 7a, b and 4-pyrazolecarbaldehydes 8a, b. The structural assignments are based on spectroscopic and X-ray diffraction data.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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