反应详情

A solution of Example 202 (15 mg, mmol) and 2N LiOH (3 mL) in MeOH (3 mL) was stirred at RT overnight. The reaction mixture was adjusted to pH=4, extracted with ethyl acetate (3×20 mL), the combined organic extracts were washed with brine, dried (Na2SO4), and filtered. After the filtrate was concentrated, the residue was purified by preparative-TLC to afford 3-(3-{3-t-butyl-5-[3-(4-chloro-phenyl)-ureido]-pyrazol-1-yl}-phenyl)-2-methyl-propionic acid as a racemate (13 mg, 90%). 1H NMR (DMSO): 12.48 (br s, 1H), 9.35 (br s, 1H), 7.55 (d, J=8.8 Hz, 1H), 7.34-7.32 (m, 2H), 7.26 (d, J=8.4 Hz, 1H), 7.24 (d, J=8.8 Hz, 2H), 7.10 (d, J=7.6 Hz, 1H), 6.45 (s, 1H), 2.74 (m, 1H), 2.65 (m, 1H), 2.31 (m, 2H), 1.26 (s, 9H), 0.99 (d, J=6.8 Hz, 3H); MS (ESI) m/z: 455 (M+H+).

1. extractionextracted with ethyl acetate (3×20 mL)
2. washthe combined organic extracts were washed with brine
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. concentrationAfter the filtrate was concentrated
6. customthe residue was purified by preparative-TLC