Ethyl Lactate → HCID 57550359, Verbindung

Temperatur

0 °C

In a screw-cap vial was added sodium hydride (60% in mineral oil, 175 mg, 4.36 mmol) and tetrahydrofuran (1 mL). The suspension was cooled to 0° C. A solution of ethyl lactate (0.46 mL, 3.97 mmol) in tetrahydrofuran (3.0 mL) was added to the above suspension and the resulting reaction mixture was stirred at room temperature for 15 min. To this mixture added 4-fluoro-benzyl bromide (0.75 g, 3.97 mmol) solution in tetrahydrofuran (4 mL) followed by tetrabutyl ammonium iodide (10 mg). The reaction mixture was stirred at room temperature overnight. The reaction mixture was diluted with water (10 mL) and extracted with ethyl acetate (3×20 mL). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated in vacuo. The crude residue was purified on silica gel using hexanes:ethyl acetate=98:2 to hexanes:ethyl acetate=92:8 in a gradient fashion, to isolate the desired product as clear oil (0.380 g, 42%). 1H NMR (300 MHz, CDCl3): δ 7.31 (m, 2H), 6.97 (m, 2H), 4.59 (d, 1H), 4.37 (d, 1H), 4.16 (q, 2H), 4.01 (q, 1H), 1.39 (d, 3H), 1.25 (t, 3H)

1. customthe resulting reaction mixture
2. stirringThe reaction mixture was stirred at room temperature overnight
3. extractionextracted with ethyl acetate (3×20 mL)
4. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude residue was purified on silica gel

ORD-Eintrag

ord-89977b33cab24ed09ac8db0413203d59

Quelldatensatz

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07935703B2