Synthesis of Piperidinones through a Radical Cascade

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.

radical reactions - silicon - domino reactions - piperidines - cyclizations

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