Journal ArticleDOI
Dihydroisochinolinumlagerung, 22. Mitt.: 1-Picolyl-1,2-dihydroisochinolin
Joachim Knabe,G. Link +1 more
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TLDR
In this article, the synthesis of 1-picolyl-1,2-dihydroisoquinoline is reported, which gives not the expected rearrangement, but elimination of the C-1-substituent leading to the products 8 and 9.Abstract:
Es wird uber die Synthese des 1-Picolyl-1,2-dihydroisochinolins 7 berichtet. 7 erleidet bei Behandlung mit Sauren nicht die erwartete Umlagerung, sondern quantitativ Eliminierung des C-1-Substituenten unter Bildung von 8 und 9. Diese Eliminierung erfolgt uberraschenderweise bereits in polaren Losungsmitteln wie Methanol oder Wasser quantitativ bei Raumtemperatur.
Dihydroisoquinoline-Rearrangement.
The synthesis of 1-picolyl-1,2-dihydroisoquinoline 7 is reported. With acids 7 gives not the expected rearrangement, but elimination of the C-1-substituent leading to the products 8 and 9. Surprisingly this elimination-reaction occurs also in the polar solvents methanol or water at room temperature in quantitative yield.read more
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Book ChapterDOI
Developments in the Chemistry of Reissert Compounds (1968-1978)
TL;DR: A review of the development in the chemistry of Reissert compounds is given in this paper, focusing on the reactions under acidic conditions; reactions involving the formation of an anion of the reissert compound; and reduction reactions.
Book ChapterDOI
1,2-Dihydroisoquinolines and Related Compounds
TL;DR: In this paper, the formation, stability, detection, estimation, and reactions of 1,2-dihydroisoquinoline are discussed, including rearrangements and elimination of the C-1 substituent.
Journal ArticleDOI
[Transposition of dihydroisoquinolines. 24. 1-picolyl-1,2 dihydroisoquinolin, elimination instead of transposition].
Joachim Knabe,Gebhard Link +1 more
TL;DR: In this paper, the Synthese des 1-Picolyl-1,2-dihydroisochinolins 3a berichtet, das unter Einwirkung verdunnter Sauren, aber also bereits in polaren Losungsmitteln, Eliminierung des C-1-Substituenten unter Bildung von 4 and 5a erleidet.
Journal ArticleDOI
Dihydroisochinolinumlagerung, 27. Mitt. Ein neuer Vorschlag zum Mechanismus
Joachim Knabe,Rudolf Heckmann +1 more
TL;DR: For the rearrangement of 1-benzyl-1,2-dihydroisoquinolines, a new proposal is presented, which is compatible with all presently known facts as discussed by the authors.
References
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Journal ArticleDOI
Eine Ultramikroschnellmethode zur gleichzeitigen Bestimmung des C‐, H‐ und N‐Gehaltes organischer Verbindungen
TL;DR: In this paper, the Verbrennungs-produkte werden uber ein mit Kupfer gefulltes Reduktionsrohr geleitet, das den Sauerstoff zuruckhalt und Stickoxyde zu Stickstoff reduziert, anschliesend durch eine kleine Silicagelsaule, in der das Wasser adsorbiert wird.
Journal ArticleDOI
Alkylation of amines: a new method for the synthesis of quaternary ammonium compounds from primary and secondary amines
TL;DR: The observation that protonation of sterically hindered amines is only slightly affected by steric hindrance, whereas nucleophilicity as measured by the rate of alkylation is considerably decreased, is synthetically utilized.
Journal ArticleDOI
Reissert compound studies. VII. The synthesis of calycotomine
TL;DR: The alkaloid calycotomine has been synthesized in 44% overall yield by use of the Reissert compound of 6, 7-dimethoxyisoquinoline as mentioned in this paper.
Journal ArticleDOI
Zum Mechanismus der 1,2‐Dihydroisochinolinumlagerung Dihydroisochinolinumlagerung, 21. Mitt
Joachim Knabe,Axel Ecker +1 more
TL;DR: When 1-cyclopropyl-1,2-dihydroisoquinoline 1 is treated with dilute acids, no rearrangement occurs but only disproportionate to 2 and 3.
Journal ArticleDOI
Die optische Reinheit von chiralem Hexobarbital und chiraler 1-Methyl-5-propyl-5-phenyl-barbitursäure 17. Mitt. Barbitursäurederivate
Joachim Knabe,Volker Gradmann +1 more
TL;DR: In this paper, the optical purity and absolute rotation of hexobarbital and 1-methyl-5-propyl-5phenyl-barbituric acid were determined and the enantiomers possessing the highest rotation were optically pure.