Hydrochloric Acid → 2,4,5-Trichloropyridin-3-amine

Thirty percent aqueous hydrogen peroxide (3.0 g, 26 mmol) was added dropwise with stirring at 15° C. to a solution of 8.0 g (49 mmol) of 3-amino-4,5-dichloropyridine in 450 mL of 37 percent aqueous hydrochloric acid. After 30 min another 2.6 g (23 mmol) of 30 percent aqueous hydrogen peroxide was added and the solution was allowed to slowly warm to room temperature. The resulting mixture was diluted with water, neutralized with sodium carbonate, and extracted with ether. The ethereal extract was dried over magnesium sulfate and filtered. The filtrate was concentrated by evaporation under reduced pressure to obtain a viscous oil. This oil was partially purified by chromatography to obtain 2.5 g (26 percent of theory) of the title compound, a white solid melting at 88°-90° C., and 5.3 g of a mixture of the title compound and 3-amino-2,4,5,6-tetrachloropyridine.

1. extractionextracted with ether
2. extractionThe ethereal extract
3. dry with materialwas dried over magnesium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated by evaporation under reduced pressure
6. customto obtain a viscous oil
7. customThis oil was partially purified by chromatography

ORD record

ord-622b07163b18429e96c7c7ca3e1f197f

Source dataset

uspto-grants-1997_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05700940