“…[2a,5] Moreover, the acridones are also served as useful building blocks for the construction of organic semiconductors, [6] dyestuffs and fluorescent labels. [7] As a consequence, great effort has been devoted to developing new protocols for their preparation. Up to now, the synthetic methods mainly rely on (i) the intramolecular cyclization of the corresponding Narylsubstituted acids, amides, and ketones (Scheme 1, path a) [8] as well as 2-aminobenzophenones (Scheme 1, path b and c), [9] (ii) the palladium/copper co-catalyzed oxidative carbonylation of diphenylamines with CO (Scheme 1, path d); [10] and Cu(II)-mediated cascade reaction of o-amino acetophenones and phenylboronic acids (Scheme 1, path e); [11] (iii) the annulation of anthranilic acid derivatives with aryne or aryliodonium (Scheme 1, path f [12] and g [13] ).…”