Synthesis of fused piperidinones through a radical-ionic cascade

The Journal of Organic Chemistry
Edouard GodineauYannick Landais

Abstract

Azabicyclo[4.3.0]nonanes 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 alpha-iodoester to the less substituted end of the enoxime which is then followed by a 5-exo-trig cyclization onto the aldoxime function, producing an alkoxyaminyl radical species which finally lactamizes to afford the titled piperidinone. High levels of stereoinduction were observed, demonstrating the ability of a silicon group located at the allylic position to efficiently control the stereochemistry of the two newly created stereogenic centers. When the radical cascade was extended to ketoximes, the resulting sterically hindered alkoxyaminyl radical did not react further with the initiator Et3B to produce the expected nucleophilic amidoborane complex. In sharp contrast, this long-lived radical recombined with the initial alpha-stabilized ester radical to produce a cyclopentane incorporating two ester fragments.

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Citations

Aug 29, 2009·Angewandte Chemie·K C NicolaouJason S Chen
Apr 13, 2011·Chemistry : a European Journal·Sophie ColombelXavier Pannecoucke
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Melvyn B AnsellJohn Spencer
Oct 20, 2010·Organic Letters·Antoine JoostenJan Szymoniak
Apr 1, 2015·Organic Letters·Benjamin OvadiaYannick Landais

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