Pal B, Sahoo S, Mal P. Atom Transfer Radical Addition Reactions of Quinoxalin-2(1
H)-ones with CBr
4 and Styrenes Using Mes-Acr-MeClO
4 Photocatalyst.
J Org Chem 2024;
89:1784-1796. [PMID:
38214146 DOI:
10.1021/acs.joc.3c02469]
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Abstract
The atom transfer radical addition (ATRA) reaction is defined as a method for introducing halogenated compounds into alkenes via a radical mechanism. In this study, we present an ATRA approach for achieving regioselective functionalization of quinoxalin-2(1H)-ones by activating C-Br bonds of CBr4 and subsequent trihaloalkyl-carbofunctionalization of styrenes employing the 9-mesityl-10-methylacridinium perchlorate (Fukuzumi) photocatalyst under 3W blue LED (450-470 nm) irradiation. This three-component radical cascade process demonstrates remarkable efficiency in the synthesis of 1-methyl-3-(3,3,3-tribromo-1-(4-chlorophenyl)propyl)quinoxalin-2(1H)-one derivatives.
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