Hydrochloric Acid → 5-Bromo-2-methylpyridin-3-amine

To a solution of 5-bromo-2-methyl-3-nitropyridine (13.8 g, 63.9 mmol) in industrial methylated spirit (330 mL) at 40° C. was added iron powder (20 g) (portionwise to avoid clumping) followed by concentrated aqueous hydrochloric acid (5 mL). The dark brown mixture was stirred vigorously at reflux for 2 hours and then cooled and filtered through Celite® (which was washed with 1 L of industrial methylated spirit). The solvent was then removed in vacuo and the residue taken up in ethyl acetate (200 mL) and washed with a saturated aqueous solution of sodium bicarbonate (200 mL), dried over magnesium sulfate and solvent removed in vacuo to give 5-bromo-2-methylpyridin-3-amine as an orange solid (10.7 g, 90%). 1HNMR (400 MHz, CDCl3, δ): 7.91 (s, 1H), 7.00 (s, 1H), 3.75 (br. s., 2H), 2.25 (s, 3H).

1. temperatureat reflux for 2 hours
2. temperaturecooled
3. filtrationfiltered through Celite® (which was washed with 1 L of industrial methylated spirit)
4. customThe solvent was then removed in vacuo
5. washwashed with a saturated aqueous solution of sodium bicarbonate (200 mL)
6. dry with materialdried over magnesium sulfate and solvent
7. customremoved in vacuo

ORD record

ord-6dcb1e2f79ea496e9a3978c082f9f427

Source dataset

uspto-grants-2014_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08859773B2