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  • Organic Chemistry  (5)
  • 1985-1989  (5)
  • 1950-1954
  • 1945-1949
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 731-735 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An Improved Synthesis of 8-Amino-2-methyl-4-phenyl-1,2,3,4-TetrahydroisoquinolineThe regioselectivity of the reaction of 2-nitrobenzylmethylamine (1) and styrenoxide (2) leading to a mixture of the isomeric aminoalcohols 3a and 3b has been studied. The course of the reaction strongly depends on the type of the solvent used as reaction medium. The highest selectivity (3a:3b = 9:1) was achieved with a combination of polar aprotic and protic solvents (DMFA and ethanol). 1H n.m.r. spectroscopy was used for identification of the isomers as well as for the determination of their ratio in the crude reaction mixtures. The isomer ratio remains unaffected during catalytic reduction (Ra-Ni) of 3a/3b to a mixture of the corresponding aminoalcohols 4a and 4b. Pure 3a, 4a and 4b were independently synthesized for comparison. Cyclodehydration of crude 4a/4b mixtures gives 5 in a very good yield.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1107-1109 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The adducts 4a, b, initially formed from the coumarins 1a, b and ene-diamino ester 2, have been converted into substituted benzopyrano[3,4-c]pyridines 5, 7, and 8. The tricyclic compound 7 is obtained by base-catalyzed rearrangement of the decarboxylated adduct 3. The possible intermediate of this reaction is trapped as an acetate 6 upon treatment of 3 with acetic anhydride. The adduct 10 (from the acid 1a and ethyl 3-aminocrotonate) decarboxylates spontaneously to give the dihydrocoumarin 11 which rearranges further to yield the 2-pyridinone 12. The cyclohexenone 13 is isolated as byproduct.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1101-1105 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaktion von 3,3-Diaminopropensäure-ethylester mit Isocyanaten und IsothiocyanatenDie Titelverbindung 1 reagiert mit Alkyl-(oder Phenyl-)isocyanaten 2 im Molverhältnis 1:1 zu den N-Monaddukten 3, die sich leicht zu den 6-Aminouracilen 4 cyclisieren: im Molverhältnis 1:2 werden hauptsächlich die N,N′-Bis-Addukte 6 und in zwei Fällen geringe Mengen der C,N-Bis-Addukte 5 erhalten. Die N,N′-Bis-Addukte 6 sind sehr empfindlich gegen Wasser, wobei die Ureidoester 7 entstehen. Durch basenkatalysierte Cyclisierung lassen sich die Addukte 6 in die substituierten Uracile 8 umwandeln. Die Addition von 1 an Isothiocyanate 9 liefert hauptsächlich die C-Monoaddukte 10 und als Nebenprodukte die 6-Amino-2-thiouracile 11.
    Notes: The title compound 1 reacts with alkyl (or phenyl) isocyanates 2 in a molar ratio of 1:1 to give the N-monoadducts 3 which cyclize readily to yield the 6-aminouracils 4, whereas in a molar ratio of 1:2 mainly N,N′-bisadducts 6 and, in two cases, small amounts of C,N′-bisadducts 5 are formed. The N,N′-bisadducts 6 are extremely sensitive to water giving the ureido esters 7, but can be converted into substituted uracils 8 under basic conditions. The addition of 1 to isothiocyanates 9 yields mainly the C-monoadducts 10 and, as minor products, the 6-amino-2-thiouracils 11.
    Additional Material: 3 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 815-818 
    ISSN: 0170-2041
    Keywords: 3-Morpholinones, 4-alkyl-; LDA metallation of, hydroxyalkylation of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By addition of the lithium derivatives of some substituted 4-alkyl-3-morpholinones to carbonyl compounds, a series of racemic 2-(1-hydroxyalkyl)-4-alkyl-3-morpholinones 2 and 3 was obtained. The stereochemical course of the reaction is discussed on the basis of the isomer ratio of 2b (determined by 1H-NMR spectroscopy).
    Additional Material: 1 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 1041-1043 
    ISSN: 0170-2041
    Keywords: 2H-1-Benzopyran-2-ones ; 2-Chromanones, 3-allylated ; 1,8-Diazabicyclo[5.4.0]undec-7-ene ; Michael reactions ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of nitromethane to 3-substituted 2H-1-benzopyran-2-ones 3 and 5 by the action of 1,8-diazabicyclo[5.4.0]-undec-7-en was investigated. It was found that the reaction proceeds only in the presence of allyl bromide.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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