Methanol → Methyl 2-(5-bromopyridin-3-yl)acetate

Temperatur

0 °C

To a suspension of 2-(5-bromopyridin-3-yl)acetic acid (5 g, 23.14 mmol) in MeOH (100 mL) was added thionyl chloride (1.858 mL, 25.5 mmol) at 0° C., and the mixture was stirred at 0° C. for 2 h. The mixture was concentrated in vacuo, re-dissolved in DCM (100 mL) and MeOH (10 mL), and saturated NaHCO3 in water (5 mL) was added, followed with NaHCO3 (10 g). To the mixture was added silica gel (10 g) and the mixture was concentrated. The residue was purified by silica chromatography eluting with 0-50% EtOAc-heptane to give methyl 2-(5-bromopyridin-3-yl)acetate. 1H NMR (400 MHz, DMSO-d6) δ ppm 3.64 (s, 3H), 3.80 (s, 2H), 8.01 (dd, J=2.0 Hz, 1H), 8.48 (d, J=1.8 Hz, 1H), 8.61 (d, J=2.3 Hz, 1H).

1. concentrationThe mixture was concentrated in vacuo
2. dissolutionre-dissolved in DCM (100 mL)
3. additionMeOH (10 mL), and saturated NaHCO3 in water (5 mL) was added
4. additionTo the mixture was added silica gel (10 g)
5. concentrationthe mixture was concentrated
6. customThe residue was purified by silica chromatography
7. washeluting with 0-50% EtOAc-heptane

ORD-Eintrag

ord-7ca55e2e02b34bd78f2b6521da4abef5

Quelldatensatz

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08383827B2