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Pyrido[1,2-a]pyrazine - Startprodukte für regioselektive Ringtransformationen und supramolekulare Architekturen / Pyrido[1,2-a]pyrazines - Starting Materials for Regioselective Ringtransformation Reactions and Supramolecular Architectures
-
D. Müller
and
H. Görls
Published/Copyright:
June 2, 2014
The easily available pyrido[1,2-a]pyrazines of type 1 are versatile building blocks for ring transformation reactions.W ith heterocyclic quinones such as quinoline-2,5,8-triones 4a-c, a highly regioselective [4+2]-cycloaddition reaction takes place in the first step, followed by a ring transformation cascade.T he 1,6-diazaanthracene-2,9,10-triones 5a-e, which possess an additional bipyridine substructure, could be isolated as main products.In order to modify the starting products of type 1, a metal-catalyzed cross-coupling reaction with acetylenic benzoic esters 9a,b has been performed.T he modified pyridopyrazines 10a,b which were obtained in good yields could be transformed by analogy to 1a,b into ring-fused heterocyclic quinones 12a,b.
Received: 2001-12-14
Published Online: 2014-6-2
Published in Print: 2002-4-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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- Pyrido[1,2-a]pyrazine - Startprodukte für regioselektive Ringtransformationen und supramolekulare Architekturen / Pyrido[1,2-a]pyrazines - Starting Materials for Regioselective Ringtransformation Reactions and Supramolecular Architectures
Articles in the same Issue
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- Novel Tandem Cyclisations at the Piperazinedione Ring via Cope Rearrangement
- Sultam and Sultim Structures, Part 2. Functionalized Novel Cyclic Sulfin- and Sulfonamides: A Comparison of Hydrogen Bonding Formation in Sulfoxides and Sulfones
- Mass Spectrometry of Oligomeric Cyanines and Squaraines of the Indole Series: Fast Atom Bombardment-Induced Chemical Reactions
- Orthoamide, LVIII . Kondensationsreaktionen von CH2-aciden Verbindungen mit Orthoamiden von Carbonsäuren und Alkincarbonsäuren / Orthoamides, LVIII . Condensation Reactions of CH2-Acidic Compounds with Orthoamides of Carboxylic Acids and Alkyne Carboxylic Acids
- Preparation and Characterisation of Several New N-Disubstituted 2-Aminoselenophene Derivatives
- Enaminosulfones from 3-Trifloxypropene Iminium Salts: A 1,5(O→C) Trifluoromethylsulfonyl Shift
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- Dicyanomethylene Compounds as Cyanation Reagents
- Pyrido[1,2-a]pyrazine - Startprodukte für regioselektive Ringtransformationen und supramolekulare Architekturen / Pyrido[1,2-a]pyrazines - Starting Materials for Regioselective Ringtransformation Reactions and Supramolecular Architectures
