2-Bromo-5-chloropyridine → HCID 178451146, Verbindung

Temperatur

-78 °C

t-BuLi (0.950 mL, 1.52 mmol) was added dropwise to a cooled solution of 2-bromo-5-chloropyridine (225 mg, 1.17 mmol) in DCM (11 mL) at −78° C. over 2 minutes. The reaction mixture was stirred for 2 hours at −78° C. and a solution of butyl trans-4-acetylcyclohexanecarboxylate (291 mg, 1.286 mmol) in DCM (1 mL) was added dropwise at −78° C. The reaction mixture was slowly warmed to room temperature over a period of 16 hours. The reaction mixture was quenched with saturated aqueous NH4Cl and extracted with DCM (3×). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetate/hexanes) to afford trans-butyl 4-(1-(5-chloropyridin-2-yl)-1-hydroxyethyl)cyclohexanecarboxylate as a brown oil. MS ESI calc'd for C18H27ClNO3 [M+H]+ 340. found 340.

1. temperatureThe reaction mixture was slowly warmed to room temperature over a period of 16 hours
2. customThe reaction mixture was quenched with saturated aqueous NH4Cl
3. extractionextracted with DCM (3×)
4. washThe combined organic layers were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by silica gel chromatography (ethyl acetate/hexanes)

ORD-Eintrag

ord-1084353c6071462ca758614fd7cc31a9

Quelldatensatz

uspto-grants-2016_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09376418B2