Trifluoroacetyl fluoride → Methyl 4,4,4-trifluoro-3-oxo-2-(piperidin-1-ylmethylidene)butyrate

Temperatur

-30 °C

Methyl 3-piperidin-1-ylacrylate (97%, 25 g, 0.14 mol) and KF (12.5 g, 76.3 mmol) were initially charged in 250 ml of toluene and cooled to −30° C. At this temperature, trifluoroacetyl fluoride (99.5%, 18.3 g, 0.16 mol) was then introduced. The reaction mixture was stirred at −30° C. for 3 h and then, over a period of one hour, warmed to room temperature. The reaction mixture was washed with deionized water (100 ml). After phase separation, the aqueous phase was extracted once with toluene (100 ml). The toluene phases were combined, washed with an aqueous sat. NaCl solution (100 ml) and then freed from the solvent under reduced pressure. Methyl 4,4,4-trifluoro-3-oxo-2-(piperidin-1-ylmethylidene)butyrate was obtained as an orange solid (amount: 38.0 g; purity according to GC: 98%; yield: 98%). 1H-NMR (CDCl3): δ=1.75 (m, 6H), 3.3 (m, 2H), 3.6 (m, 2H), 3.75 (s, 3H), 7.65 ppm (s, 1H).

1. waitover a period of one hour
2. temperaturewarmed to room temperature
3. washThe reaction mixture was washed with deionized water (100 ml)
4. customAfter phase separation
5. extractionthe aqueous phase was extracted once with toluene (100 ml)
6. washwashed with an aqueous sat. NaCl solution (100 ml)

ORD-Eintrag

ord-0f891db9256144ecaeb523f906976417

Quelldatensatz

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08586750B2