After establishing the methylation of aryl bromides, we sought to expand our methodology towards heteroaryl bromides. Bicyclic systems underwent smooth methylation, as shown for quinolines (13b-15b, 26-84%). Additionally, quinoxaline-and isoquinoline-scaffolds were susceptible to our conditions, albeit furnishing the desired products in reduced yield (16b, 17b; 33%, 31%). Indole-scaffolds delivered the methylated heteroarenes in moderate to excellent yields (18b-21b, 48-98%). The methylation of diversely functionalized pyridines and pyrimidines occurred smoothly (22b-31b, 37-99%). Notably, Pirfenidone 27b, an FDA-approved drug for the treatment of idiopathic pulmonary fibrosis, could be isolated in 78% yield. Eventually, we applied our method to challenging oxygen-and sulfur-containing heterocycles, which were efficiently methylated in moderate to good yields (32b-35b, 40-83%). During the exploration of the scope, we encountered diminished yields due to the unexpected volatility of some of the desired products. Additionally, low conversions or decomposition of substrates bearing labile protons or Lewis-acid sensitive functionalities was found to be a limitation of our methodology (see Supporting Information).