Issue 11, 2024

Diverting the Mannich reaction to access 2,2-disubstituted indolin-3-ones by merging 1,2-aryl migration and copper-catalyzed aerobic oxidation

Abstract

The venerable Mannich reaction using p-anisidine, an aldehyde, and a nucleophile affords a linear α-secondary amine motif. Herein, we report that a slight yet rational modification of the reaction inputs diverts this three-component reaction, providing a cyclic α-tertiary amine. 2,2-Disubstituted indolin-3-ones equipped with diverse substitution patterns on their de novo generated quaternary carbon centers are readily accessible through this unprecedented transformation. Mechanistically, a domino sequence involving a kinetically favored intramolecular 1,2-aryl migration and a copper-catalyzed aerobic oxidation of an activated α-aminoalkyl site is suggested to account for the reaction outcome.

Graphical abstract: Diverting the Mannich reaction to access 2,2-disubstituted indolin-3-ones by merging 1,2-aryl migration and copper-catalyzed aerobic oxidation

Supplementary files

Article information

Article type
Research Article
Submitted
14 Mar 2024
Accepted
07 Apr 2024
First published
16 Apr 2024

Org. Chem. Front., 2024,11, 3186-3195

Diverting the Mannich reaction to access 2,2-disubstituted indolin-3-ones by merging 1,2-aryl migration and copper-catalyzed aerobic oxidation

J. Xiang, Y. Wang, P. Yuan, H. Zhu, T. Lei, A. Wu and Z. Liao, Org. Chem. Front., 2024, 11, 3186 DOI: 10.1039/D4QO00481G

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