Hydrochloric Acid → (2-Ethoxy-3-isopropylphenyl)methanol

Temperatur

0 °C

Diisobutylaluminum lithium hydride (55.0 mL of a 1.0 M in hexanes, 55.0 mmol) was added drop-wise to an ice-cold solution of 2-ethoxy-3-isopropylbenzoic acid propyl ester (4.34 g, 18.3 mmol) in THF (40 mL). After the addition was complete, the ice bath was removed and reaction mixture was stirred for 18 h. The reaction was cooled to 0° C. and HCl (1N, 275 mL) was added until all the resulting solids returned to solution. The mixture was extracted with EtOAc (3×150 mL). The combined organics were washed with brine (2×200 mL), dried (Na2SO4) and concentrated to yield the title compound (3.73 g, quantitative) as a light yellow oil: 1H NMR (300 MHz, DMSO-d6) δ 7.24 (d, J=5.7 Hz, 1H), 7.16 (d, J=1.7 Hz, 1H), 7.07 (t, J=7.5 Hz, 1H), 5.02 (t, J=5.6 Hz, 1H), 4.52 (d, J=5.6 Hz, 2H), 3.77 (q, J=7.0 Hz, 2H), 3.32-3.25 (m, 1H), 1.33 (t, J=6.9 Hz, 3H), 1.16 (d, J=6.9, 6H).

1. additionAfter the addition
2. customthe ice bath was removed
3. customreaction mixture
4. extractionThe mixture was extracted with EtOAc (3×150 mL)
5. washThe combined organics were washed with brine (2×200 mL)
6. dry with materialdried (Na2SO4)
7. concentrationconcentrated

ORD-Eintrag

ord-1735bc30176641e9a0eaf26858f0c271

Quelldatensatz

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07879872B2