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1989 (1)
1988 (1)
1987 (2)
1Author    Hans Möhrle, Heinz DwuletzkiRequires cookie*
 Title    Lactamacetale als potentielle Enamin-Synthone in Heterocyclensynthesen 3. Mitteilung: Das Sarkosinanhydrid-monoIactamacetal-System in Cycloadditionsreaktionen Lactam Acetals as Potential Enamine Synthons in Heterocyclic Synthesis 3rd Communication: The Sarcosinanhydride-monolactamacetal System in Cycloaddition Reactions  
 Abstract    Sarcosinanhydride-monolactamacetal (7) furnishes an equilibrium concentration of the elec-tronically activated tetrahydropyrazine 3b which yields in contrast to other pyrazine derivatives with 4-nitrophenylazide (4) the cycloaddition product 9. Catalytic cleavage of 9 leads to the triazene compound 11. 
  Reference    Z. Naturforsch. 42b, 229—232 (1987); eingegangen am 26. September 1986 
  Published    1987 
  Keywords    Lactam Acetals, Heterocyclic Synthesis, Cycloaddition Reactions, Triazene 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0229.pdf 
 Identifier    ZNB-1987-42b-0229 
 Volume    42 
2Author    N. S. Ibrahim, R. M. Mohareb, H. Z. ShamsRequires cookie*
 Title    Nitriles in Heterocyclic Synthesis: New Approaches for Synthesis of Some Pyridine Derivatives  
 Abstract    A variety of pyridines was prepared from reaction of N-benzylidenecyanoethanoic hydrazide (2) with malononitrile, benzoylacetonitrile, cyanoacetamide and cinnamonitrile derivatives. The reactivity of 2 towards a variety of ketones was studied. 
  Reference    Z. Naturforsch. 43b, 1351—1354 (1988); received March 31 1987/June 16 1988 
  Published    1988 
  Keywords    Cyanoethanoic Hydrazide, Heterocyclic Synthesis, Pyridine Derivatives 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1351.pdf 
 Identifier    ZNB-1988-43b-1351 
 Volume    43 
3Author    Hans Möhrle, Heinz DwuletzkiRequires cookie*
 Title    Einstufen-Synthese des y-Carbolingerüsts durch Diels-Alder-Reaktion von Indol-"Keten-N,0-acetalen" Lactam Acetals as Potential Enamine Synthons in Heterocyclic Synthesis, 4th Communication One Step Synthesis of the y-Carboline Frame via Diels-Alder Reaction of Indol-"K etene-N .O -A cetals"  
 Abstract    2-Alkoxy-indoles 2a, b can be regarded as cyclic ketene-N .O -acetals. Their regiospecific [4+2]-Diels-A lder reaction with inverse electron dem and with the triazine 3 yield in a one step addition the y-carboline (4). 
  Reference    Z. Naturforsch. 42b, 1032—1034 (1987); eingegangen am 5. März 1987 
  Published    1987 
  Keywords    Lactam A cetals, Heterocyclic Synthesis, Cycloaddition Reactions, y-Carbolines 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1032.pdf 
 Identifier    ZNB-1987-42b-1032 
 Volume    42 
4Author    MohamedHilmy Elnagdia, Ahmed Hafez, Hussien Elghandoura, Usef Kamal, Mahmoud Sadekb, Mahfouz Mohamed, Ramizc, R. EgyptRequires cookie*
 Title    Studies on Condensed Pyrazoles A New Route for Synthesis of Pyrazolo[4,3-c]pyrazoles  
 Abstract    A novel synthesis of pyrazolo[4,3-c]pyrazoles via 1,5-dipolar cyclization of products of coupling of 2,3-dimethyl-l-phenyl-5-oxo-3-pyrazolin-4-diazonium chloride with active methylene reagents is reported. 
  Reference    Z. Naturforsch. 44b, 951 (1989); received July 8 /November 2 1988 
  Published    1989 
  Keywords    Heterocyclic Synthesis, Activated Nitriles, Heterocyclic Diazonium Salts, Pyrazolo[4, 3-c]pyrazoles 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-0951.pdf 
 Identifier    ZNB-1989-44b-0951 
 Volume    44