Cesium carbonate → Methyl 4-(3-hydroxypropoxy)-3-methyl-benzoate

Temperatur

60 °C

To a solution of methyl 4-hydroxy-3-methyl-benzoate (3.03 g, 18.2 mmol) in DMF (9 mL) was added 3-bromopropan-1-ol (3.80 g, 2.4 mL, 27.4 mmol) and cesium carbonate (17.8 g, 54.7 mmol) and the reaction mixture was heated at 60° C. for 16 hours. The reaction mixture was cooled to room temperature and then partitioned between water (250 mL) and ethyl acetate (2×100 ml). The organic layers were combined, washed with brine solution (50 mL), dried over Na2SO4, filtered and concentrated in vacuo to yield a crude oil that was purified by silica gel column chromatography eluting with EtOAc/hexanes (10-100%) to give methyl 4-(3-hydroxypropoxy)-3-methyl-benzoate (1.87 g, 46%) as a white solid. ESI-MS m/z calc. 224.0. Found 225.0 (M+1)+; Retention time: 1.27 minutes (3 min run); 1H NMR (400 MHz, CDCl3) δ 7.94-7.77 (m, 2H), 6.85 (d, J=8.5 Hz, 1H), 4.18 (t, J=5.9 Hz, 2H), 3.98-3.82 (m, 5H), 2.24 (s, 3H), 2.10 (p, J=5.9 Hz, 2H).

1. temperatureThe reaction mixture was cooled to room temperature
2. custompartitioned between water (250 mL) and ethyl acetate (2×100 ml)
3. washwashed with brine solution (50 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto yield a crude oil that
8. customwas purified by silica gel column chromatography
9. washeluting with EtOAc/hexanes (10-100%)

ORD-Eintrag

ord-9e84d25889b84a979805ea28cf224cc4

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08828996B2