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  • 1975-1979  (2)
  • Organic Chemistry  (2)
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  • 1
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Indole, XII1). - Syntheses of Compounds Similar to Eserine, III; New Derivatives of Deoxyeseroline Substituted at N-1 and N-8 and a Novel Synthesis of EseretholeTreatment of the ethyl 3-methyl-4-phenylhydrazonobutanoates 1 with HCI/ethanol gives the furoindolones 2 in good yields. Reaction of 2 with primary amines furnishes the pyrroloindolones 3 without by-products. Furthermore, reactions of 2 with complex hydrides and with Grignard compounds are described. Eserethole (4e) has been obtained in quantitative yield by reaction of 2g with LiAIH4.
    Notes: Die Behandlung der 3-Methyl-4-phenylhydrazonobutansäure-ethylester 1 mit HCI/Ethanol liefert in guten Ausbeuten die Furoindolone 2. Die Reaktion von 2 mit primären Aminen ergibt ohne Nebenprodukte die Pyrroloindolone 3. Weiterhin werden Umsetzungen von 2 mit komplexen Hydriden und mit Grignard-Verbindungen beschrieben. Aus 2g erhält man mit LiAIH4 in quantitativer Ausbeute Eserethol (4e).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Indole, XIII1). - Syntheses in the β-Carboline Series, II; (±)-Yohimban and (±)-Epialloyohimban by a Novel Indole SynthesisThe hydrindanone derivative 17 undergoes Schmidt rearrangement to yield selectively after reduction by LiAlH4 the perhydroisoquinolines 20, which have been alkylated at N-2′ by ethyl bromoacetate to give 21. Compound 21 has been cyclized by polyphosphoric anhydride via the acid 22 to yield the yohimban-6-ones 23 which on treatment with LiAlH4 give the title compounds 24a and b. To check the new synthesis the racemate of the natural substance 7 was synthesized.
    Notes: Durch Schmidt-Umlagerung des Hydrindanonderivats 17 und Reduktion mit LiAlH4 erhielt man selektiv die Perhydroisochinoline 20, welche am N-2′ mit Bromessigester zu 21 alkyliert und mittels Polyphosphorsäureanhydrid über die Säuren 22 zu den Yohimban-6-onen 23 cyclisiert werden konnten. Mit LiAlH4 entstanden daraus die Titelverbindungen 24a und b. Zuvor wurde zur Erprobung des neuen Syntheseweges das Racemat des Naturstoffs 7 dargestellt.
    Type of Medium: Electronic Resource
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