Cyclopropanecarbonitrile → HCID 86762433, compound

Temperature

-5 °C

Under an atmosphere of argon, 5-chloro-2,3-difluoropyridine (6 g, 4.17 ml, 40.1 mmol, Eq: 1.00) was combined with toluene (60.0 ml). Then cyclopropanecarbonitrile (2.69 g, 3.02 ml, 40.1 mmol, Eq: 1.00) was added to the solution. At −5° C., potassium bis(trimethylsilyl)amide (80.3 ml, 40.1 mmol, Eq: 1.00) was added dropwise over 30 min. The dark brown reaction was stirred for 1 hour at −5° C., and then for 2 h at room temperature. The reaction mixture was poured into satd. NH4Cl solution (50 ml) and extracted with 2×100 ml ethyl acetate. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (70 g column, from 100% to 50% heptane in ethyl acetate). The title compound was obtained as a orange oil (1.55 g, 13.8%, MS (m/e)=197.2 [M+H+].

1. customThe dark brown reaction
2. waitfor 2 h at room temperature
3. additionThe reaction mixture was poured into satd
4. extractionNH4Cl solution (50 ml) and extracted with 2×100 ml ethyl acetate
5. dry with materialThe organic layer was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude material was purified by flash chromatography (70 g column, from 100% to 50% heptane in ethyl acetate)

ORD record

ord-394fc234d78545b089df535ce20979e3

Source dataset

uspto-grants-2014_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08729061B2