Methylamine → 6-bromo-N-methyl-2-naphtamide

Participants

Reaction Conditions

Reaction Steps

4 Liters of ethyl acetate and 25 mL of DMF were added to 500 g (1.99 mol) of 6-bromo-2-naphthoic acid. 188 mL (2.61 mol, 1.3 eq) of thionyl chloride was added dropwise at 30° C. or lower. The mixture was stirred at 65° C. for 30 minutes. After cooled to 25° C., a mixture of 408 mL (3.93 mol, 2 eq) of a 40% solution of methylamine in methanol and 558 mL (4.01 mol, 2 eq) of triethylamine was added dropwise at 25° C. or lower. The mixture was stirred at 25° C. for 3 hours. 2.5 Liters of water was added dropwise at 25° C. or lower. Crystals were filtered, and washed successively with 1.25 liters of a mixed solution of methanol/water=1/4. Vacuum drying (50° C.) to a constant weight afforded 422 g of 6-bromo-N-methyl-2-naphthamide (yield 80%).

Provenance & Evidence