3-(2-Cyano-4-{2-[5-methyl-2-(4-phenoxyphenyl)oxazol-4-yl]ethoxy}phenyl)propionic acid ethyl ester → 3-(2-Cyano-4-{2-[5-methyl-2-(4-phenoxyphenyl)oxazol-4-yl]ethoxy}phenyl)propionic acid

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A mixture of 2-(3-ethoxy-but-3-enyl)-5-hydroxy-benzonitrile (220 mg, 1.00 mmol), toluene-4-sulfonic acid 2-[5-methyl-2-(4-phenoxy-phenyl)-oxazol-4-yl]-ethyl ester (450 mg, 1.00 mmol; Preparation 6), and CsCO3 (978 mg, 3.00 mmol) in DMF (10 mL) was stirred overnight at 60° C. under an N2. The mixture was cooled, diluted with EtOAc (20 mL) and washed with brine (20 mL). The organic layer was dried (Na2SO4) and concentrated. The product mixture was purified by radial chromatography (10-70% EtOAc/hexanes) to give 3-(2-cyano-4-{2-[5-methyl-2-(4-phenoxyphenyl)oxazol-4-yl]ethoxy}phenyl)propionic acid ethyl ester (201 mg). A solution of this ester in EtOH (10 mL) and 5N NaOH (10 mL) was heated at 70° C. overnight, concentrated, acidified with 1N HCl, and extracted with EtOAc. The organic layer dried (Na2SO4) and concentrated to give the title compound (192 mg); MS [ES] m/z 469 (M+1).

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