## Abstract Isomerisation and dehydrogenation of 5‐hydroxy‐benz(ed)‐indoline (I) over a palladium catalyst have been studied systematically. In the absence of pre‐adsorbed hydrogen, dehydrogenation to 5‐keto‐1,5‐dihydro‐benz(ed)indole (IV) occurs. In the presence of hydrogen or a hydrogen donor suc
Die Synthese von 5-Oxy-benz(cd)indolin und dessen Umlagerung in 5-Keto-1,3,4,5-tetrahydro-benz(cd)indol
✍ Scribed by C. A. Grob; J. Voltz
- Publisher
- John Wiley and Sons
- Year
- 1950
- Tongue
- German
- Weight
- 740 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Es wird eine praktische Synthese des 5‐Keto‐1,3,4,5‐tetrahydrobenz(cd)indols beschrieben. Die Hauptmerkmale dieser Synthese sind:
Die Überführung von 1‐Methoxy‐5‐acetamino‐naphtalin in 5‐Oxy‐benz(cd)indolin in drei Stufen;
Die Isomerisierung von 5‐Oxy‐benz(cd)indolin zu 5‐Keto‐1,3,4,5‐tetrahydro‐benz(cd)indol.
📜 SIMILAR VOLUMES
## Abstract In contrast to the facile isomerisation of 5‐hydroxy‐benz(cd)‐indoline (Ia) to 5‐keto‐1, 3, 4, 5‐tetrahydro‐benz(cd)indole (II) reported earlier, its N‐acetyl derivative Ib is not isomerised to the N‐acetylated ketone III in the presence of a palladium catalyst.
The synthesis of 5‐keto‐2a,3,4,5‐tetrahydronaphtostyril (3) via 4‐nitro‐indanone is described.
Three methods for converting the oxindole ring of 2a,3,4,5‐tetrahydronaphtostyril (Ia) into the indole ring of 1,3,4,5‐tetrahydrobenz[cd]indole (I1 a) are described.
Die Mikroanalysen wurden im Mikrolabor des Institutes fur Organische Chemie an der Universitat Basel (Leitung Herr E. THOMMEN) ausgefiihrt. ## SUMMARY Methods for the synthesis of compounds containing the tetracyclic ergoline system 111, by fusion of a dihydro-or tetrahydro-pyridine ring onto the