Sodium Cyanide → 2-Amino-2-(fluoromethyl)-5-methoxypentanenitrile

Temperatur

-30 °C

Under an atmosphere of nitrogen, 3-methoxypropyl magnesium chloride is prepared from 3-methoxy-1-chloropropane (5.43 g, 50 mmol, prepared according to Haworth and Perkin, Chem. Zentralblatt II 1271 (1912) and magnesium turnings (1.22 g, 50 mmol) in dry THF (50 ml). The mixture is heated under reflux for 3 hours, then cooled to -30° C. and a solution of fluoroacetonitrile (2.95 g, 50 mmol) in THF (30 ml) is added during 20 minutes. After keeping the mixture at -30° C. for 1/2 hour more, a solution of sodium cyanide (4.9 g, 100 mmol) and ammonium chloride (8.09 g, 150 mmol) in water (100 mL), previously cooled to 0° C., is added and the mixture is stirred for 3/4 hours at room temperature. After saturating with sodium chloride, the THF layer is separated and the aqueous phase is extracted twice with ether. After drying (Na2SO4), the combined organic extracts are evaporated to give 2-fluoromethyl-2-amino-5-methoxyvaleronitrile (4.0 g) as a brown oil.

1. customprepared
2. temperatureThe mixture is heated
3. temperatureunder reflux for 3 hours
4. customat -30° C.
5. customfor 1/2 hour
6. additionis added
7. concentrationAfter saturating with sodium chloride
8. customthe THF layer is separated
9. extractionthe aqueous phase is extracted twice with ether
10. dry with materialAfter drying (Na2SO4)
11. customthe combined organic extracts are evaporated

ORD-Eintrag

ord-791213980e6741aea291d0ca425a56ec

Quelldatensatz

uspto-grants-1982_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04309442