Acetonitrile → 5,5,5-Trifluoro-4,4-dimethyl-3-oxopentanenitrile

Temperatur

-78 °C

To a mixture of MeCN (3.32 mL, 97 mmol) in THF (300 mL) cooled to −78° C. was added n-BuLi (56.4 mL, 141 mmol). The mixture was stirred at −30° C. for 30 min. Then to the mixture was added methyl 3,3,3-trifluoro-2,2-dimethylpropanoate (15 g, 88 mmol) dropwise. The mixture was stirred at 25° C. for 10 h. The mixture was quenched with aqueous NH4Cl and extraced with DCM/MeOH (10:1). The organic layer was dried over Na2SO4, filtered and concentrated. The crude material was purified by silica column chromatography (PE/EA=10:1). All fractions found to contain product by TLC (PE/EA=5:1, Rf=0.6) were combined and concentrated to yield a light yellow solid of 5,5,5-trifluoro-4,4-dimethyl-3-oxopentanenitrile (5 g, 27.9 mmol, 31.7% yield): 1H NMR (400 MHz, CDCl3) δ: 3.75 (s, 2H), 1.41 (s, 6H).

1. stirringThe mixture was stirred at 25° C. for 10 h
2. customThe mixture was quenched with aqueous NH4Cl
3. dry with materialThe organic layer was dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude material was purified by silica column chromatography (PE/EA=10:1)
7. concentrationconcentrated

ORD-Eintrag

ord-3fd28f33402248129c2a967dc393ab41

Quelldatensatz

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09382238B2