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DOI: 10.1055/s-0036-1588749
Concise Total Syntheses of Paullone and Kenpaullone via Cyanide-Catalyzed Intramolecular Imino-Stetter Reaction
Publikationsverlauf
Received: 01. Februar 2017
Accepted after revision: 22. Februar 2017
Publikationsdatum:
14. März 2017 (online)


Published as part of the Special Topic Modern Cyclization Strategies in Synthesis
Abstract
Highly concise total syntheses of paullone and kenpaullone were developed. Cyanide-catalyzed intramolecular imino-Stetter reaction of aldimines derived from methyl 2-aminocinnamate derivatives and 2-nitrobenzaldehyde provided 2-(2′-nitrophenyl)indole-3-acetic acid derivatives. Subsequent reduction of the nitro group with zinc under acidic conditions to an amino group followed by spontaneous lactam formation allowed for the total syntheses of paullone and kenpaullone to be completed in two steps starting from commercially available materials. The direct use of a nitro group as the precursor of an amino group present in the phenyl ring at the 2-position in the indole ring significantly streamlined the total syntheses of these target molecules.
Key words
paullone - kenpaullone - total synthesis - cyanide-catalyzed imino-Stetter reaction - umpolung of aldiminesSupporting Information
- Supporting information for this article is available online at http://dx.doi.org/10.1055/s-0036-1588749.
- Supporting Information