Potassium Phosphate, Tribasic → 5-Cyclopropyl-2-fluoropyridine

Temperature

100 °C

A mixture of 2-fluoro-5-bromopyridine (1.17 ml, 11.4 mmol), cyclopropylboronic acid (1.47 g, 17.1 mmol) and potassium phosphate (7.26 g, 34.2 mmol) in 1,4-dioxane (20 ml) was stirred under argon atmosphere. Chloro(di-2-norbornylphosphino)(2-dimethylaminoferrocen-1-yl)palladium(II) (67 mg, 0.11 mmol) was added. The reaction mixture was heated at 100° C. under argon atmosphere for 48 hours and then cooled down to room temperature. The crude mixture was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel by flash column chromatography (ISCO Companion|, 80 g column, 0-10% EtOAc/Petroleum ether) to afford the compound (70:30 mixture product: starting material; 1.55 g).

1. temperaturecooled down to room temperature
2. customThe crude mixture was partitioned between ethyl acetate and water
3. washThe organic phase was washed with brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified on silica gel by flash column chromatography (ISCO Companion|, 80 g column, 0-10% EtOAc/Petroleum ether)
8. customto afford the compound (70:30 mixture product: starting material; 1.55 g)

ORD record

ord-d2979cb93a8b43e59bb9e5bc946bb5aa

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08188071B2