4-(3-Bromobenzyl)-5,7-dimethyl-2,6-dihydro-1H-pyrrolo[3,4-d]pyridazin-1-one (50) (0.188 g, 0.57 mmol), molybdenum hexacarbonyl (0.224 g, 0.85 mmol), N,N-dimethylpyridin-4-amine (0.138 g, 1.13 mmol), N-ethyl-N-isopropylpropan-2-amine (0.197 mL, 1.13 mmol) and acetoxy(2-(dio-tolylphosphino)benzyl)palladium (0.027 g, 0.03 mmol) were suspended in a mixture of dioxane (2.0 mL) and water (2.0 mL) and sealed into a microwave tube. The reaction was heated to 150° C. for 30 minutes in the microwave reactor and cooled to room temperature. The reaction mixture was diluted with water (50 mL) and EtOAc (50 mL). The mixture was filtered through celite. The layers were separated and the aqueous was adjusted to pH2 with 2M HCl. The resulting precipitate was collected by filtration, washed with water (50 mL), Et2O (50 mL) and dried under vacuum to afford the desired material as a brown solid (0.200 g, >100% yield), which was used without further purification. 1H NMR (400.132 MHz, DMSO) δ 2.26 (3H, s), 2.51 (3H, s), 4.13 (2H, s), 7.39-7.48 (2H, m), 7.78 (2H, m), 11.08 (1H, s), 11.93 (1H, s), 12.86 (1H, s); m/z (LC-MS, ESI+), RT=1.41 min (M+H=298.08).
