反应详情

To a suspension of 5-chloromethyl-4-methyl-2-(4-trifluoromethyl-phenyl)-oxazole (0.10 g, 0.36 mmol) and Cs2CO3 (0.24 g, 0.72 mmol) in 2 mL acetonitrile is added (4-hydroxy-2-propyl-phenoxy)-acetic acid ethyl ester (0.09 g, 0.38 mmol). The solution is stirred for 6 hrs and poured into water (10 mL) and extracted with ethyl acetate (3×15 mL). The combined organics are washed with water (10 mL) and brine (10 mL), dried (Na2SO4), filtered and concentrated in vacuo. The crude product is purified using flash column chromatography (20% ethyl acetate/hexanes) to afford 0.13 g (85%) desired {4-[4-Methyl-2-(4-trifluoromethyl-phenyl)-oxazol-5-ylmethoxy]-2-propyl-phenoxy}-acetic acid methyl ester. This ester is hydrolyzed in the usual way using 0.14 g ester and 3 eq. 1M LiOH in 3 mL 3:2:1 THF:MeOH:H2O to afford 0.16 g (95%) of the title compound.

1. extractionextracted with ethyl acetate (3×15 mL)
2. washThe combined organics are washed with water (10 mL) and brine (10 mL)
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe crude product is purified