Ground state generation and cyclization of aminium radicals in the formation of tetrahydroquinolines

Pratley, Cassie and Fenner, Sabine and Murphy, John A. (2024) Ground state generation and cyclization of aminium radicals in the formation of tetrahydroquinolines. Organic Letters, 26 (6). pp. 1287-1292. ISSN 1523-7060 (https://doi.org/10.1021/acs.orglett.4c00179)

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Abstract

This paper reports the first examples of ground state radical-mediated intramolecular C-H amination to afford 1-methyl-1,2,3,4-tetrahydroquinolines from N-2,4-dinitrophenoxy derivatives of arylpropylamines. Whereas the photoactivation of N-2,4-dinitrophenoxyamines for intermolecular reactions has been established, ground state chemistry provides the desired cyclization products in moderate to excellent yields using Ru(bpy) 3Cl 2 (42-95% yields) under acidic conditions under an air atmosphere.