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  • Electronic Resource  (14)
  • 1985-1989  (14)
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  • Electronic Resource  (14)
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  • 11
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ungewöhnlich verknüpfte Nucleoside, I. - Tributylammonium-phosphate in Chloroform zur direkten Verknüpfung von 2-Desoxy-D-ribose mit N6-substituierten AdeninenPhosphorpentoxid reagiert mit Wasser und Tributylamin in Chloroform zu einer homogenen Lösung von Tributylammonium-phosphat, Pyrophosphat und Trimetaphosphat. 3-(9-Adenyl)-2,3-didesoxy-D-threo-pentofuranosen 3 fallen kristallin an, wenn 2-Desoxy-D-ribose (2) mit N6-substituierten Adeninen 1 in dieser Lösung 7 Tage bei 40°C umgesetzt wird.
    Notes: Phosphorus pentoxide reacts with water and tributylamine in chloroform to give a homogeneous solution of tributylammonium phosphate, pyrophosphate, and trimetaphosphate. 3-(9-Adenyl)-2,3-dideoxy-D-threo-pentopyranoses 3 precipitate on treatment of 2-deoxy-D-ribose (2) with N6-substituted adenines 1 in this solution at 40°C after 7 days.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 1145-1146 
    ISSN: 0170-2041
    Keywords: 3-Pyrrolecarbonitriles, 2-amino- ; Malononitriles, phenylacyl ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Amino-3-pyrrolecarbonitriles are prepared by the reaction of phenacylmalononitrile with primary aromatic amines using a catalytical amount of concd. HCl.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 142-148 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorpentoxid in der Organischen Synthese, XII.  -  Synthese von 7H-Pyrrolo[2,3-d]-pyrimidin-4-aminenEs wird ein einstufiges Verfahren zur Herstellung einiger neuer substituierter 7H-Pyrrolo[2,3-d]-pyrimidin-4-amine 2 beschrieben. Dazu werden die entsprechenden Pyrrolo[2,3-d]pyrimidin-4(3H)-one 1 in einer Mischung aus Phosphorpentoxid, N,N-Dimethylcyclohexylamin und dem geeigneten Amin-hydrochlorid erhitzt. Bei Hydrochloriden aromatischer Amine verläft die Reaktion glatt bei 200-220°C innerhalb von 1-4h, Hydrochloride aliphatischer Amine hingegen reagieren langsamer und liefern die Produkte 3 in geringer Ausbeute. Im Fall von Diethylamin-hydrochlorid wird zusammen mit dem erwarteten Produkt 3e das dimere Kondensationsprodukt 5 isoliert. Ferner werden die Ergebnisse von Pestizid-Eignungstests mitgeteilt.
    Notes: A one-step synthesis for the preparation of a new series of substituted 7H-pyrrolo[2,3-d]pyrimidin-4-amines 2 is described. The method consists in heating the corresponding pyrrolo [2,3-d]pyrimidin-4(3H)-ones 1 in a mixture of phosphorus pentoxide, N,N-dimethylcyclohexylamine, and the appropriate amine hydrochloride. With aromatic amine hydrochlorides the reaction proceeds smoothly at 200-220°C for 1-4 h, whereas with aliphatic amine hydrochlorides, the reaction takes place at slower rate affording the products 3 in lower yields. With diethylamine hydrochloride, the condensed dimeric product 5 is isolated together with the expected product 3e. The results from pesticide screenings are reported.
    Type of Medium: Electronic Resource
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1012-1020 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese neuer 2-Azaadenine und 2-Azahypoxanthine aus 4-Diazo-4H-imidazolenEine Reihe neuer, möglicherweise biologisch wirksamer N6-substituierter 2-Azaadenine 5 wurde aus 5-Amino-1H-imidazol-4-carboxamid-hydrochlorid über 4-Diazo-4H-imidazol-5-carbonitril (1), das mit primären Aminen gekuppelt wurde, mit 11 - 78proz. Ausbeute hergestellt. Auch einige 1-substituierte 2-Azahypoxanthine 9 wurden aus 5-Amino-1H-imidazol-4-carbonsäure-ethylester (6) über 4-Diazo-4H-imidazol-5-carbonsäure-ethylester (7) durch Kopplung mit primären Aminen mit 17 - 66proz. Ausbeute gewonnen.
    Notes: 5-Amino-1H-imidazole-4-carboxamide hydrochloride has been converted into a series of new, potentially biologically active N6-substituted 2-azaadenines 5 via 4-diazo-4H-imidazole-5-carbonitrile (1) which was coupled with primary amines to give 5 in 11 - 78% yield. Further, some 1-substituted 2-azahypoxanthines 9 have been prepared in 17 - 66% yield from ethyl 5-amino-1H-imidazole-4-carboxylate (6) via ethyl 4-diazo-4H-imidazole-5-carboxylate (7) which was coupled with primary amines.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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