Acetone → 2-(3-Bromo-5-fluoropyridin-4-yl)propan-2-ol

Temperatur

-40 °C

n-BuLi 1.6M in hexanes (11.25 ml, 18.00 mmol) was added dropwise to a solution of diisopropylamine (2.78 ml, 19.50 mmol) in THF (50.0 ml) at −78° C. under N2. The resulting mixture was warmed up to −40° C. and stirred for 10 min and recooled to −78° C. 3-bromo-5-fluoropyridine (2.64 g, 15 mmol) in 5 mL THF was added dropwise at this temperature. After 30 min, acetone (3.30 ml, 45.0 mmol) was added dropwise and the resulting mixture was stirred for 30 min at −78° C., and then for another 30 min at 0° C. The mixture was quenched with saturated NH4Cl and extracted with EtOAc two times, dried over magnesium sulfate, filtered, concentrated. The residue was purified via Biotage (0-30% AcOEt/heptane, SNAP50) giving 10a (1.691 g, 48%) as a yellow oil. LC-MS (M+1) 235.9, t=1.18 min.

1. customrecooled to −78° C
2. waitAfter 30 min
3. stirringthe resulting mixture was stirred for 30 min at −78° C.
4. waitfor another 30 min at 0° C
5. customThe mixture was quenched with saturated NH4Cl
6. extractionextracted with EtOAc two times
7. dry with materialdried over magnesium sulfate
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was purified via Biotage (0-30% AcOEt/heptane, SNAP50)

ORD-Eintrag

ord-e4aef0b642f74a1aab82ca8032037062

Quelldatensatz

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08519134B2