Silane, ((1-methoxy-2-methyl-1-propenyl)oxy)trimethyl- → methyl 3-(1-(4-fluorophenyl)-1H-indazol-5-yl)-3-hydroxy-2,2,5-trimethylhexanoate

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1-(1-(4-Fluorophenyl)-1H-indazol-5-yl)-3-methylbutan-1-one (220 mg, 0.742 mmol) was dissolved in 10 mL of dry DCM and 1-methoxy-2-methyl-1-(trimethylsiloxy)propene (0.162 mL, 0.8 mmol) was added. The reaction mixture was cooled to 0° C. and TiCl4 (0.8 mL of 1.0 M DCM solution, 0.8 mmol) was added portionwise and then stirred 12 h. The reaction was quenched with aqueous sodium bicarbonate and extracted 2×DCM. The organic layers were dried over MgSO4, filtered, and concentrated. The residue was purified SiO2 chromatography eluting with 1:1 EtOAc/hexane to give 280 mg (95% yield) of methyl 3-(1-(4-fluorophenyl)-1H-indazol-5-yl)-3-hydroxy-2,2,5-trimethylhexanoate. MS found: (M+H)+=399.

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