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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1823-1836 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stereoselektive intramolekulare Nitron-Cycloaddition bei der Synthese von Lasubin IIDie intramolekulare Cycloaddition α-substituierter N-Alkenylnitrone 2 führt zu den 7-Oxa-1-azanorbornanen 6, 7 und 8 mit einer Selektivität von ca. 80% zugunsten des exo,exo-disubstituierten Isomeren 6. Diese Verbindungen lassen sich leicht zu den all-cis-2,6-disubstituierten 4-Hydroxypiperidinen 4 reduzieren, die geeignete Edukte für die Synthese bestimmter Alkaloide sind. Dies wurde durch die Synthese von Lasubin II belegt
    Notes: The intramolecular cycloaddition of α-substituted N-alkenylnitrones 2 leads to the 7-oxa-1-azanorbornanes 6, 7, and 8 with a selectivity of ca. 80% in favor of the exo,exo-disubstituted compound 6. The latter can be reduced to give the all-cis-2,6-disubstituted 4-hydroxypiperidines 4 which are key compounds for the synthesis of certain alkaloids as demonstrated by the synthesis of lasubine II.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 215-219 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereoselektive Addition von Crotylboronsäureestern an OximeAddition der E-sowie Z-Crotylboronsäureester 8, 9 an Aldoxime ließ sich unter 4-9 kbar Druck in guten Ausbeuten realisieren. Dabei resultierte eine der Richtung nach überraschende Diastereoselektivität: E-8 ergab bevorzugt die anti-, Z-9 die syn-N-(β-Methylalkyl)hydroxylamine 10, 11.
    Notes: The addition of E-and Z-crotylboronates 8, 9 to aldoximes has been realized in good yields by running the reaction under 4-9 kbar pressure. The direction of the attendant diastereoselectivity was surprising: E-8 led preferentially to the anti-, Z-9 to the syn-N-(β-methylalkyl)hydroxylamines 10, 11.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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