Methylamine → 2-(4-methoxybenzyl)-5-bromo-4-(methylamino)pyridazin-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

In a glass pressure reactor vessel equipped with a magnetic stir bar, toluene (100 mL) was saturated with anhydrous methylamine at 0° C. then 2-(4-methoxybenzyl)-4,5-dibromopyridazin-3(2H)-one (1) (22 g, 59 mmol) was added. The vessel was sealed and the suspension was stirred and heated at 90° C. for 18 h. The resulting suspension was allowed to cool to RT. Anhydrous methylamine was bubbled through the mixture for 15 min, the reactor was sealed again, and the mixture was stirred and heated at 90° C. for an additional 18 h. After cooling to RT, the mixture was concentrated in vacuo to dryness. The resulting brown solid was suspended in MeOH and sonicated. The solid was collected by suction filtration, washed with MeOH, and dried in vacuo to give 2-(4-methoxybenzyl)-5-bromo-4-(methylamino)pyridazin-3(2H)-one as a yellow solid.

Provenance & Evidence