Methylamine → N-methyl-5-nitropyridin-2-amine

A solution of 2-bromo-5-nitro-pyridine (4 g, 19.7 mmol) and methylamine (2 M in THF, 15 mL, 30 mmol) in methylene chloride (40 mL) was heated at 50 degrees overnight. After cooling to room temperature, the reaction mixture was concentrated to give methyl-(5-nitro-pyridin-2-yl)-amine that was used in the following step without purification. Acetic anhydride (9.3 mL, 98.5 mmol) was added to the solution of methyl-(5-nitro-pyridin-2-yl)-amine (3.01 g, 19.7 mmol), pyridine (24 mL, 197 mmol), and a catalytic amount of 4-dimethylamino-pyridine (DMAP) in methylene chloride (40 mL). The resulted mixture was heated at 90 degrees for overnight. After the reaction was complete, solvent was removed, and then ethyl acetate was added. The ethyl acetate solution was extracted three times with water. Organic layers were combined, washed with brine, dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck silica gel 60, 230-400 mesh, 50% ethyl acetate in hexane for 20 min) gave N-methyl-N-(5-nitro-pyridin-2-yl)-acetamide.

1. concentrationthe reaction mixture was concentrated

ORD record

ord-8f993863ba3745589ac746b200add317

Source dataset

uspto-grants-2010_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07714126B2