2,2,2-Trifluoroethanol → Ethyl 5-chloro-6-(2,2,2-trifluoroethoxy)nicotinate

Temperatur

-73 °C

To a solution of ethyl 5,6-dichloronicotinate (6.28 g, 28.5 mmol) and 2,2,2-trifluoroethanol (2.71 ml, 37.1 mmol) in THF (90 ml) at −73° C. was added NaHMDS (37.1 ml, 37.1 mmol). The reaction was stirred at −73° C. for 30 minutes, then at 0° C. for 5 hours. The reaction was quenched with 30 mL saturated NH4Cl solution. The reaction mixture was then poured into 50 mL brine and phases were separated. The aqueous layer was extracted with DCM (2×100 mL). The combined organics were dried (Na2SO4) and concentrated. Silica gel chromatography with 100% heptane to 30% EtOAc in heptane provided final product (7.51 g). LCMS m/z 284.1 (M+H)+, Rt 1.07 min.

1. waitat 0° C. for 5 hours
2. customThe reaction was quenched with 30 mL saturated NH4Cl solution
3. additionThe reaction mixture was then poured into 50 mL brine and phases
4. customwere separated
5. extractionThe aqueous layer was extracted with DCM (2×100 mL)
6. dry with materialThe combined organics were dried (Na2SO4)
7. concentrationconcentrated

ORD-Eintrag

ord-45a32a935ddc4df1a4e0d16c03d5c2e1

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09434719B2