Until now, cascade reactions involving five-membered ,-palladacycles rely heavily on Pd(0)-catalyzed C-H functionalization of aryl halides initiated by carbopalladation. Herein, we report a novel Pd(II)-catalyzed cascade decarboxylative cyclization of -alkynylanilines initiated by aminopalladation. In this protocol, -alkynylanilines undergo sequential aminopalladation, C-H activation, and dealkylation to form ,-palladacycles, which are then trapped by -bromobenzoic acids or 8-bromo-1-naphthoic acid to produce diverse polycyclic heteroarenes, such as dibenzo[,]carbazoles and multiple arene-fused cyclohepta[1,2-]indoles.
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