Herein,
a novel method for the gram-scale synthesis of (E)-quinoxalinone oximes through a multicomponent reaction
under mild conditions is described. Such a transformation was performed
under transition-metal-free conditions, affording (E)-oximes in a moderate-to-good yield through recrystallization. Our
methodology demonstrates a successful combination of a Mannich-type
reaction and radical coupling, providing a green and practical approach
for the synthesis of potentially bioactive quinoxalinone-containing
molecules.