Hydrochloric Acid → N-methyl-1-(3-nitrophenyl)methanamine

To a mixture of sodium cyanoborohydride (2.52 g), triethylamine (18.7 ml), methylamine hydrochloride (5.42 g) and methanol (660 ml), m-nitrobenzaldehyde (10.10 g) was added dropwise over 20 minutes at room temperature and the resulting mixture was stirred at room temperature for 20 h. The pH of the reaction mixture was adjusted to 2 by addition of 10% HCl and the methanol was distilled off under reduced pressure. The residue was washed with chloroform and a 10% aqueous potassium hydroxide solution was added to the aqueous layer for pH adjustment to 12, and the mixture was extracted with chloroform. The organic layer was washed with a saturated aqueous sodium chloride solution, dried with anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (eluent, chloroform:methanol=95:5) to give 3.0 g of the titled compound (yield, 27%).

1. additionwas added dropwise over 20 minutes at room temperature
2. distillationthe methanol was distilled off under reduced pressure
3. washThe residue was washed with chloroform
4. additiona 10% aqueous potassium hydroxide solution was added to the aqueous layer for pH adjustment to 12
5. extractionthe mixture was extracted with chloroform
6. washThe organic layer was washed with a saturated aqueous sodium chloride solution
7. dry with materialdried with anhydrous magnesium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe resulting residue was purified by silica gel column chromatography (eluent, chloroform:methanol=95:5)

ORD record

ord-ef9b062d3d5541aab401786779702b12

Source dataset

uspto-grants-2003_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06534546B1