ZfN: Search Results

1	Author	Hans Möhrle, Heinz Dwuletzki	Requires 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

2	Author	N. S. Ibrahim, R. M. Mohareb, H. Z. Shams	Requires 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

3	Author	Hans Möhrle, Heinz Dwuletzki	Requires 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

4	Author	MohamedHilmy Elnagdia, Ahmed Hafez, Hussien Elghandoura, Usef Kamal, Mahmoud Sadekb, Mahfouz Mohamed, Ramizc, R. Egypt	Requires 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