Synthesis 2023; 55(11): 1736-1743
DOI: 10.1055/a-1959-1930
paper
Special Issue dedicated to Prof. Cristina Nevado, recipient of the 2021 Dr. Margaret Faul Women in Chemistry Award

Chiral Acyl Radicals Generated by Visible Light Enable Stereoselective Access to 3,3-Disubstituted Oxindoles: Application toward the Synthesis of (–)- and (+)-Physovenine

Josef Späth
,
Meghan J. Oddy
,
,
The authors would like to thank the Royal Society and the African Academy of Sciences (FLR\R1\190531), the Royal Society of Chemistry (RF21-7183233767), the National Research Foundation (W.F.P., grant no.: 138082), and the University of Cape Town (W.F.P.; M.J.O.; J.S. [UCT, B.R.A.A.S]) for their funding contributions.


Abstract

Exploration of the repurposing of N-acyl chiral auxiliaries for use as novel chiral C1 radical synthons is reported. The acyl radicals are generated under visible-light-mediated single-electron transfer of N-hydroxyphthalimido ester, and their use toward the stereoselective synthesis of 3,3-disubstituted oxindoles via a radical addition–cyclisation sequence is demonstrated. The downstream synthetic utility of this method is showcased in the formal synthesis of the natural product (–)-physovenine. TEMPO trapping experiments support the proposed reaction mechanism.

Supporting Information



Publication History

Received: 09 September 2022

Accepted: 12 October 2022

Accepted Manuscript online:
12 October 2022

Article published online:
08 December 2022

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