6-Chloro-10-methyl-1,11-diazaphenothiazin-5-one was synthesized and used in cross-coupling of arylboronic acids using Suzuki protocol under nickel complex catalysis to furnish intense coloured heterocycles. Structures assigned to the synthesized were supported by spectra and analytical data obtained
Phenothiazinone, Suzuki reaction, Cross-coupling, Nickel catalysis