A cascade reaction, catalyzed by copper, results in the formation of quinazolinone through a radical methylation, sp3 C-H amination, and oxidation process. In this reaction, dicumyl peroxide serves dual functions: as an oxidant and as an effective source of methyl groups. Y. Bao, Y. Yan, K. Xu, J. Su, Z. Zha, Z. Wang, J. Org. Chem., 2015, 80, 4736-4742.
A rhodium-catalyzed carbonylative annulation process effectively produces thiochromenones through a [3+2+1]-type annulation reaction, using nonactivated aromatic sulfides and terminal alkynes as the starting materials. F. Zhu, X.-F. Wu, J. Org. Chem., 2018, 83, 13612-13617.
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