Hydrochloric Acid → 3-Cyano-2-fluorophenylhydrazine

Temperatur

0 °C

3-Amino-2-fluoro-benzonitrile (100 mg, 0.735 mmol) was dissolved in water (0.94 mL), added with conc. hydrochloric acid (0.74 mL) at 0° C., and then further added with an aqueous solution (0.294 mL) of sodium nitrite (61 mg, 0.882 mmol). The resulting mixture was stirred at 0° C. for 1 hr. To the reaction mixture, conc. hydrochloric acid solution (0.94 mL) of tin chloride (321 mg, 1.69 mmol) was added and stirred at room temperature for 1 hr. Thereafter, the reaction solution was neutralized with aqueous solution of sodium hydroxide, and extracted with dichloromethane. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. The drying agent was removed by filtration and the residues were obtained after concentration under reduced pressure to give the target compound as a crude product.

1. stirringstirred at room temperature for 1 hr
2. extractionextracted with dichloromethane
3. washThe organic layer was washed with saturated brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe drying agent was removed by filtration
6. customthe residues were obtained
7. concentrationafter concentration under reduced pressure

ORD-Eintrag

ord-a7f744f47f3945f8b33a72b454b258ee

Quelldatensatz

uspto-grants-2015_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09126931B2