[F:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[C:16]3[C:11](=[CH:12][C:13](CO)=[C:14]([CH:17]([CH3:19])[CH3:18])[CH:15]=3)[CH:10]=[N:9]2)=[CH:4][CH:3]=1.[CH3:22][O:23][C:24]([O:28][Si](C)(C)C)=[C:25]([CH3:27])[CH3:26].[CH2:33](Cl)Cl>Cl[Ti](Cl)(Cl)Cl>[F:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[C:16]3[C:11](=[CH:12][C:13]([CH2:26][C:25]([CH3:33])([CH3:27])[C:24]([O:23][CH3:22])=[O:28])=[C:14]([CH:17]([CH3:19])[CH3:18])[CH:15]=3)[CH:10]=[N:9]2)=[CH:6][CH:7]=1(1-(4-Fluorophenyl)-6-isopropyl-1H-indazol-5-yl)methanol (145 mg, 0.51 mmol) was dissolved in 5 mL of dry DCM and TiCl4 (60 mL of 1.0 M DCM solution, 60 mmol) was added portionwise and then stirred 30 min. Then the reaction was treated with 1-methoxy-2-methyl-1-(trimethylsiloxy)propene (0.2 mL, 1.0 mmol). The reaction was quenched with aqueous sodium bicarbonate and extracted 2×EtOAc, the organic layers dried over MgSO4, filtered, and concentrate. The residue was purified on SiO2 by MPLC using a 5:95 to 10:90 EtOAc/hexane gradient to give 87 mg (47% yield) of methyl 3-(1-(4-fluorophenyl)-6-isopropyl-1H-indazol-5-yl)-2,2-dimethylpropanoate. MS found: (M+H)+=369.
Wird geladen…