O[Li].O.[C:4]1([N:10]2[C:18]3[CH2:17][CH2:16][CH2:15][CH:14]([CH2:19][C:20]([O:22]CC)=[O:21])[C:13]=3[CH:12]=[N:11]2)[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1>O.CO>[C:4]1([N:10]2[C:18]3[CH2:17][CH2:16][CH2:15][CH:14]([CH2:19][C:20]([OH:22])=[O:21])[C:13]=3[CH:12]=[N:11]2)[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1LiOH.H2O (120 mg, 2.85 mmol), dissolved in 1 ml of water, is added to a solution of ethyl 2-(4,5,6,7-tetrahydro-1-phenyl-1H-indazol-4-yl)acetate (808 mg, 2.85 mmol) in methanol (20 mL) and is stirred at room temperature for 1 hour following the reaction by means of TLC. The methanol is evaporated under reduced pressure, the residue is suspended in water and acidified with diluted HCl forming a pulp that is extracted with ethyl acetate. The organic phase is washed with water, dried and evaporated at reduced pressure, giving 2-(4,5,6,7-tetrahydro-1-phenyl-1H-indazol-4-yl)acetic acid (410 mg, 1.59 mmol, 53%, solid).
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