Scope of the intramolecular Pd-catalyzed C–H bond activation with N-methyl-N-aryl-2-halobenzamides^a,b.

^aReactions carried out under air atmosphere using 1e–n (1 equiv., 0.2 mmol), K₂CO₃ (3 equiv.); and solvent (V_f = 4 mL), heating in an oil bath for 24 h. Pd loading in brackets.

^bYields were quantified by ¹H NMR using 4-nitroacetophenone as internal standard.

^cReaction time: 48 h.

^dSubstrate decompose under this reaction conditions.

^eDehalogenated cyclization product 2a was observed in 11% yield.