3-(2-Methylphenyl)propionic acid → 3-(2-Methylphenyl)propan-1-ol

Temperatur

0 °C

Add 2-methylhydrocinnamic acid (18.4 mmol) to anhydrous tetrahydrofuran (100 mL) and cool to 0° C. Slowly add lithium aluminum hydride (2.20 g, 58.0 mmol) and remove the ice bath after 20 minutes. Stir at room temperature under nitrogen for 18 h. Cool the reaction to 0° C. and quench the reaction by slowly adding water (2.2 mL), 15% sodium hydroxide (2.2 mL), and water (6.6 mL). Filter off the aluminum salts. Add brine (100 mL) and 5 N sodium hydroxide (30 mL) to the filtrate and extract with ethyl acetate (3×100 mL). Dry the ethyl acetate extracts with magnesium sulfate, filter, and concentrate on a rotary evaporator to yield 2.65 g (96%) of 3-o-tolyl-propan-1-ol: 1H NMR (CDCl3): 7.18-7.10 (m, 4H), 3.72 (t, 2H), 2.72-2.69 (m, 2H), 2.33 (s, 3H), 1.90-1.83 (m, 2H), 1.60 (br s, 1H).

1. temperatureCool
2. customthe reaction to 0° C.
3. customquench
4. customthe reaction by slowly adding water (2.2 mL), 15% sodium hydroxide (2.2 mL), and water (6.6 mL)
5. filtrationFilter off the aluminum salts
6. extractionAdd brine (100 mL) and 5 N sodium hydroxide (30 mL) to the filtrate and extract with ethyl acetate (3×100 mL)
7. dry with materialDry the ethyl acetate
8. filtrationfilter
9. concentrationconcentrate on a rotary evaporator

ORD-Eintrag

ord-edc1966cbbfb436885b79f9e22bbc346

Quelldatensatz

uspto-grants-2008_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07381719B2