Hydrochloric Acid → 2-methyl-4-(3-methylsulfonylamino-4-chlorophenyl)-1-(2H)-phthalazinone

Participants

Reaction Steps

To a mixture of 2-methyl-4-(3-amino-4-chlorophenyl)-1-(2H)-phthalazinone (38.72 g, 0.136 mol), CH2Cl2 (380 mL) and pyridine (75 mL) at 0° C. was added methanesulfonyl chloride (15.75 mL) in CH2Cl2 (75 mL). The reaction mixture was stirred overnight, poured into 1N HCl (400 mL) and stirred for 45 minutes. The mixture was filtered and the filtrate layers were separated. The solid thus obtained was treated with saturated NaHCO3, filtered, stirred with hexane, then filtered, stirred with hot methanol, then filtered and finally stirred with hot ethyl acetate and filtered to afford 38.8 g (78%) of 2-methyl-4-(3-methylsulfonylamino-4-chlorophenyl)-1-(2H)-phthalazinone, m.p. 234°-236° C.

Provenance & Evidence