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  • Articles: DFG German National Licenses  (6)
  • Organic Chemistry  (6)
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  • Articles: DFG German National Licenses  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Enhydrazine, 271) Einige stabile Monomethylhydrazone von Oxalessigsäure-dialkylestern (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1696-1701 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 271). - Some Stable Monomethylhydrazones of Dialkyl OxalacetatesThe title compounds 2b-d - intermediates in the cyclization reaction of the dialkyl 2-(1-methylhydrazino)maleates 1b-d to give the alkyl 5-hydroxy-3-pyrazolecarboxylates 3b-d - are trapped and isolated in crystalline form. This was not possible with the dimethyl and diallyl esters 2a and 2e. Hydrolysis of 1b and 1c gives the corresponding oxalacetates 4.
    Notes: Die Titelverbindungen 2b-d - Zwischenstufen bei der Cyclisierung der 2-(1-Methylhydrazino)maleinsäure-dialkylester 1b-d zu den 5-Hydroxy-3-pyrazolcarbonsäureestern 3b-d - werden abgefangen und in kristalliner Form isoliert. Beim Dimethyl- und beim Diallylester 2a bzw. 2e gelang dies nicht. Die Hydrolyse von 1b und 1c führt zu den entsprechenden Oxalessigsäureestern 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919791109
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Enhydrazine, 32. Ein Zugang zu 3-Hydroxymethyl-1,5,6,7-tetrahydro-4H-indazol-4-onen (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1891-1896 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 32.  -  An Access to 3-Hydroxymethyl-1,5,6,7-tetrahydro-4H-indazol-4-ones5-Methyl-1,3-cyclohexanedione is C-acylated with benzyloxyacetimidazolide to yield 2b which with hydrazines gives the 1,5,6,7-tetrahydro-4H-indazol-4-ones 3a-d. Hydrogenolysis leads to the title compounds 4a-d. The acetate 5a from 3d is hydrogenolyzed to give 5b and is further transformed into the carbamate 6.
    Notes: 5-Methyl-1,3-cyclohexandion wird von Benzyloxyessigsäure-imidazolid zu 2b C-acyliert, das mit Hydrazinen die 1,5,6,7-Tetrahydro-4H-indazol-4-one 3a-d ergibt. Deren Hydrogenolyse führt zu den Titelverbindungen 4a-d. Das Acetat 5a aus 3d wird zu 5b hydrogenolysiert und weiter in das Carbamat 6 umgewandelt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219821010
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  • 3
    Electronic Resource
    Electronic Resource
    Enhydrazine, 31. Synthese von 2,3-Dihydro-1H-pyrazolo[1,2-a]pyrazol-4-iumsalzen (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 420-430 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 311).  -  Synthesis of 2,3-Dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium SaltsThe preparation of the 1-[3-(p-tolylsulfonyloxy)propyl]pyrazoles 1c, 3c, 7e, and 11d, e is described. They easily suffer cyclization (in some cases spontaneously) to the 2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium tosylates 2b, 4b, 9, and 12a, b of which 12b possesses a constitution similar to that of mitomycin C.
    Notes: Die Darstellung der 1-[3-(p-Tolylsulfonyloxy)propyl]pyrazole 1c, 3c, 7e und 11d, e wird beschrieben. Sie gehen leicht (z. T. spontan) Ringschluß zu den 2,3-Dihydro-1H-pyrazolo[1,2-a]-pyrazol-4-ium-tosylaten 2b, 4b, 9 und 12a, b ein, von denen 12b eine dem Mitomycin C ähnliche Konstitution besitzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219820305
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  • 4
    Electronic Resource
    Electronic Resource
    Partialsynthese des “Sargasterols” und des (20S)-Cholesterols (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 1897-1906 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Partial Synthesis of “Sargastero” and (20S)-CholesterolThe data of the synthetic (20S)-3β-hydroxy-5-cholesten-24-one (5b) and its acetate 5a differ significantly from those given for the degradation product of “Sargastero”. The compounds 5a, b were converted into the E, Z-isomeric (20S)-stigmasta-5,24(28)-dien-3β-ols 8b, 9b, into their acetates 8a, 9a, and into (20S)-cholesterol (10b). (20S)-cholesterol acetate (10a) shows a lower melting point than that which is given in literature.
    Notes: Die Eigenschaften des synthetischen (20S)-3β-Hydroxy-5-cholesten-24-ons (5b) und seines Acetats 5a unterscheiden sich signifikant von den für das Abbauprodukt des “Sargasterols” beschriebenen. Aus 5a, b wurden die E, Z-isomeren (20S)-Stigmasta-5,24(28)-dien-3β-ole 8b, 9b und ihre Acetate 8a, 9a sowie das (20S)-Cholesterol (10b) dargestellt. (20S)-Cholesterolacetat (10a) zeigt einen tieferen Schmelzpunkt als in der Literatur angegeben.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219821011
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  • 5
    Electronic Resource
    Electronic Resource
    Enhydrazine, 38. Unterscheidung von 1,5,6,7-Tetrahydro-4H- und 2,5,6,7-Tetra-hydro-4H-indazol-4-onen im 13C-NMR-Spektrum (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 794-801 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enhydrazines, 38. Discrimination between 1,5,6,7-Tetrahydro-4H- and 2,5,6,7-Tetrahydro-4H-indazol-4-ones in the 13C NMR SpectrumFrom the title compounds the isomeric pairs 1a, b, 4a, b, and 5a, b were prepared. The spectroscopic properties of the regioisomers were investigated. Only the 13C NMR signals of the C atoms 3 and 7 a are significantly different within a pair and can be used for a reliable assignment. The structure of 1b was assigned by an X-ray analysis.
    Notes: Von den Titelverbindungen wurden die Isomerenpaare 1a, b, 4a, b und 5a, b dargestellt. Von den spektroskopischen Eigenschaften der Regioisomeren sind nur die 13C-NMR-Signale der C-Atome 3 und 7 a innerhalb eines Paares signifikant verschieden und für eine sichere Zuordnung geeignet. 1b wurde durch eine Röntgenstrukturanalyse gesichert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850415
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  • 6
    Electronic Resource
    Electronic Resource
    Enhydrazine, 37 Synthese eines Pyrazol-Analogen des 7-Aminomitosens (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1711-1718 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 37. - Synthesis of a Pyrazole Analogue of 7-AminomitoseneThe 9-step synthesis of 7-amino-10-azamitosene (2b) from 3a is described. The crystal-structure analysis of the precursor 1b of 3a secures the position of the substituted propyl group at N-1 of compounds 1 and 3-7.
    Notes: Die neunstufige Synthese von 7-Amino-10-azamitosen (2b) aus 3a wird beschrieben. Die Kristallstrukturanalyse des Vorläufers 1b von 3a sichert die Stellung des substituierten Propylrestes an N-1 der Verbindungen 1 und 3-7.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419841011
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