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  • 1980-1984  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Enhydrazine, 34. Die Addition von Methylhydrazin an Acetylendicarbonsäureester ist reversibel (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1520-1524 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 34. The Addition of Methylhydrazine to Dimethyl Acetylenedicarboxylate is ReversibleThe cyclisation of the enehydrazine 1 to the pyrazolone 5 proceeds by cleavage of 1 to its educts 2 and 3 followed by their recombination to 4. Addition of 2 or 3 supresses the dissociation of 1, furthermore 2 and 3 could be separately captured from 1.
    Notes: Die Cyclisierung des Enhydrazins 1 zum Pyrazolon 5 erfolgt über die Rückspaltung von 1 zu seinen Edukten 2 und 3 und deren nachfolgende Rekombination zu 4. Zusatz von 2 oder 3 drängt die Dissoziation von 1 zurück, ferner konnten 2 und 3 getrennt aus 1 abgefangen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160427
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  • 2
    Electronic Resource
    Electronic Resource
    Enhydrazine, 35. 2-[5-Hydroxy-3-(methoxycarbonyl)-1-methyl-4-pyrazolyl]-fumarsäure-dimethylester (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1525-1530 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 35. Dimethyl 2-[5-Hydroxy-3-(methoxycarbonyl)-1-methyl-4-pyrazolyl]fumarateReaction of the pyrazolone 4 with dimethyl acetylenedicarboxylate gives the title compound 1, the crystal structure analysis of which is presented. Heating of 1 leads to the lactone 2, which was synthesized through an independent route.
    Notes: Bei der Umsetzung des Pyrazolons 4 mit Acetylendicarbonsäure-dimethylester entsteht die Titelverbindung 1, deren Kristallstrukturanalyse vorgelegt wird. Erhitzen von 1 führt zum Lacton 2, das auf unabhängigem Wege synthetisiert wurde.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160428
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Enhydrazine, 36. Reaktion von Enhydrazinen mit Acetylencarbonsäureestern und 3-Butin-2-on (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1620-1635 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Enehydrazines, 36. Reaction of Enehydrazines with Acetylenecarboxylic Esters and 3-Butyn-2-oneThe enehydrazine-hydrazone tautomers 1 and 4 are added to dimethyl acetylenedicarboxylate and 8, to methyl propiolate to give the open-chain methyl 5-(2,2-dimethylhydrazino)pentadienoates 3, 5a, b and 9. The reaction of methyl propiolate and 3-butyn-2-one with 4 give a greater number of hetero- and isocyclic products. The structures of 5a, 6a as well as 10a have been determined by X-ray analysis.
    Notes: Die Enhydrazin-Hydrazon-Tautomeren 1 and 4 werden an Acetylendicarbonsäure-dimethylester, 8 wird an Propiolsäure-methylester zu den offenkettigen 5-(2,2-Dimethylhydrazino)pentadiensäure-methylestern 3, 5a, b und 9 addiert. Mit Propiolsäure-methylester und 3-Butin-2-on bildet 4 eine größere Zahl von hetero- und isocyclischen Produkten. Die Strukturen von 5a, 6a und 10a wurden durch Röntgenanalyse ermittelt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170430
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  • 4
    Electronic Resource
    Electronic Resource
    Enhydrazine, 28. Darstellung und Umwandlung zweier isomerer Pyrazoline (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2028-2030 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enehydrazines, 28. Preparation and Transformation of two Isomeric PyrazolinesThe formerly prepared pyrazolidines 1a, b are dehydrogenated to the title compounds 2a, b. Compound 2a epimerizes to 2b which eliminates methyl acetate to give the pyrazole 3.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130537
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  • 5
    Electronic Resource
    Electronic Resource
    Enhydrazine, 29. Bromierung und Aromatisierung von 3-(2-Aryliden-1-methylhydrazino)-2-cyclohexen-1-onen (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2579-2582 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enehydrazines, 29. Bromination and Aromatization of 3-(2-Arylidene-1-methylhydrazino)-2-cyclohexen-1-onesThe title compounds 1 and 2 are transformed to the bromo derivatives 3-6 and further to the benzaldehyde (3-hydroxyphenyl)methylhydrazones 7-10. Treatment of the bromide 5 with diluted sodium hydroxide gives the substitution product 15 the constitution of which is secured by means of the model compound 16.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130723
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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