Benzyl Alcohol → Benzyl 2-chloropropanoate

Temperatur

0 °C

Benzyl alcohol (242 mL, 253 g, 2.34 mol) and pyridine (204 mL, 204 g, 2.57 mol) were dissolved in methylene chloride (2.5 L) and cooled to 0° C. 2-Chloropropanoyl chloride (250 mL, 327 g, 2.57 mol) was added dropwise keeping the temperature between 0° C. and 5° C. After addition the mixture was allowed to warm to RT overnight. The mixture was washed with 20% aqueous citric acid (2.5 L), saturated aqueous NaHCO3 (2.5 L), brine (2.5 L), dried (MgSO4), filtered and concentrated in vacuo. The resulting brown liquid (450 g) was dissolved in a small amount of methylene chloride and filtered through a short path of silica gel. After concentration, the crude was purified via bulb-to-bulb distillation (2*10−2 mbar, 90-95° C.) affording the title compound as a pale yellow liquid (420 g, 90%). 1H-NMR: (CDCl3, 300 MHz): δ ppm 1.75 (d, 3H, CH3), 4.45 (q, 1H, CHCl), 5.25 (s, 2H, CH2Ar), 7.40 (m, 5H, ArH).

1. customthe temperature between 0° C. and 5° C
2. additionAfter addition the mixture
3. temperatureto warm to RT overnight
4. washThe mixture was washed with 20% aqueous citric acid (2.5 L), saturated aqueous NaHCO3 (2.5 L), brine (2.5 L)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. dissolutionThe resulting brown liquid (450 g) was dissolved in a small amount of methylene chloride
9. filtrationfiltered through a short path of silica gel
10. concentrationAfter concentration
11. distillationthe crude was purified via bulb-to-bulb distillation (2*10−2 mbar, 90-95° C.)

ORD-Eintrag

ord-5861d5cf68e747efa2361cea43916bdf

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08846933B2