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

Temperature

-78 °C

To a mixture of acetonitrile (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 NH4Cl (aq) and extracted 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 NH4Cl (aq)
3. extractionextracted with DCM/MeOH (10:1)
4. dry with materialThe organic layer was dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe crude material was purified by silica column chromatography (PE/EA=10:1)
8. concentrationconcentrated

ORD record

ord-47890c5010074b268433beaf391cff2e

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08937071B2