C-3 arylation protocols of quinoxalin-2(1H)-ones with arylhydrazines and aryl boronic acids under metal-, photocatalyst- and light-free conditions using non-toxic K2S2O8.
We report an efficient and atom-economic method of C-3 functionalization reaction of quinoxalin-2(1H)-ones with 4-hydroxycoumarins, 4-hydroxy-6-methyl-2-pyrone, and 2-hydroxy-1,4-naphthoquinone via free radical cross-coupling pathway under metal-free conditions. tert-Butylhydropreoxide (TBHP) smoothly promotes...
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