2-Chloropyridin-4-amine → 3-Bromo-2-chloropyridin-4-amine

4-amino-2-chloropyridine (50 g, 388 mmol) was dissolved in glacial acetic acid (500 mL). To this solution was added N-bromosuccinamide (75 g, 426 mmol,) portionwise at room temperature (water bath cooling was provided to control the exothermicity). The reaction mixture was stirred at RT for 1 h at which point the reaction was found complete (as monitored by TLC). Solvent was removed under reduced pressure followed by azeotropic distillation with ethanol. The crude product was purified by column chromatography on silica gel (230-400 mesh) eluting with ethyl acetate hexane mixture.

1. temperaturecooling
2. customwas provided
3. customSolvent was removed under reduced pressure
4. distillationfollowed by azeotropic distillation with ethanol
5. customThe crude product was purified by column chromatography on silica gel (230-400 mesh)
6. washeluting with ethyl acetate hexane mixture

ORDレコード

ord-f49c884ff4b54645b8e49b4da4d9151a

出典データセット

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08198448B2