“…Besides, chroman-4-one derivatives were also constructed via intramolecular oxa-Michael additions of 2'-hydroxychalcones [9,10], or through condensation cyclization reactions of o-hydroxyacetophenones with ketones/aldehydes [11,12], in addition to other alternative transformations [13,14]. Moreover, radical cascade cyclizations of o-allyloxybenzaldehydes by employing appropriate radical precursors through visible-light promoted systems [15,16], transition-metal-catalyzed systems [17,18], or transition-metal-free systems [19,20], have emerged as a powerful strategy for the synthesis of diversely functionalized chroman-4-one derivatives.…”