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Synthesis 2009(15): 2646-2649
DOI: 10.1055/s-0029-1216860
DOI: 10.1055/s-0029-1216860
PSP
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of Piperidinones through a Radical Cascade
Further Information
Received
24 March 2009
Publication Date:
29 May 2009 (online)
Publication History
Publication Date:
29 May 2009 (online)
Abstract
Fused piperidinones were assembled from chiral allylsilanes possessing an oxime moiety using a stereocontrolled formal [2+2+2] radical-ionic process. The cascade involves the addition of an α-iodo ester to an ene oxime, which is then followed by a 5-exo-trig cyclization onto the aldoxime function producing an alkoxyaminyl radical species that finally lactamizes to afford piperidinones. Application of the radical cascade to ketoximes led instead to cyclopentanes incorporating two ester fragments as a result of a recombination process.
Key words
radical reactions - silicon - domino reactions - piperidines - cyclizations
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References
The term [2+2+2] refers here as a process involving 2 atoms + 2 atoms + 2 atoms and not to a concerted process.