Synthesis of azachromones and azachromanones
Chem. Heterocycl. Compd. 2019, 55 (11), 1007–1012
This minireview highlights known methods for the synthesis of azachromones and azachromanones, including the earliest and the latest examples of their synthesis. Methods considered for constructing azachromone or azachromanone system include intramolecular heterocyclization, deprotection–cyclization, spirocyclization, cyclization–aromatization, Ullman-type O-arylation, and C–H activation of pyridine N-oxides.