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Journal ArticleDOI

Dihydroisochinolinumlagerung, 22. Mitt.: 1-Picolyl-1,2-dihydroisochinolin

Joachim Knabe, +1 more
- 01 Jan 1975 - 
- Vol. 308, Iss: 7, pp 519-525
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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.

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Citations
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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].

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

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

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

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.