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0 °C

To a solution of 4-{4-chloro-3-[3,3,3-trifluoro-2-hydroxy-1-methyl-2-(4-methyl-3-oxo-3,4-dihydro-2H-benzo[1,4]oxazin-6-yl)-propyl]-phenoxymethyl}-benzoic acid ethyl ester (Example 1, 83 mg) in tetrahydrofuran (0.3 ml) and methanol (0.3 ml) was added a 1 M aqueous LiOH solution (0.29 ml) at 0° C. The mixture was stirred at 0° C. for 30 min and at room temperature for 5.5 h. The mixture was cooled in an ice bath and acidified using 1 M aqueous HCl. The mixture was concentrated to dryness. The product was purified by chromatography (SiO2, CH2Cl2/MeOH 1:0=>85:15) to give the title compound (49 mg) as colorless foam. MS (m/e, ISP neg. ion)=548.2 [M−H+].

1. temperatureThe mixture was cooled in an ice bath
2. concentrationThe mixture was concentrated to dryness
3. customThe product was purified by chromatography (SiO2, CH2Cl2/MeOH 1:0=>85:15)