Ytterbium triflate → phenylmethyl 3-(4-{[4-[5-fluoro-2-(methyloxy)phenyl]-2-hydroxy-4-methyl-2-(trifluoromethyl)pentyl]amino}-6-methyl-1H-indazol-1-yl)benzoate

Participants

Reaction Conditions

Reaction Steps

A mixture of racemic 2-{2-[5-fluoro-2-(methyloxy)phenyl]-2-methylpropyl}-2-(trifluoromethyl)oxirane (which may be prepared according to WO 04/063163, 350 mg, 1.2 mmol), phenylmethyl 3-(4-amino-6-methyl-1H-indazol-1-yl)benzoate (Intermediate 29, 357 mg, 1.0 mmol) and ytterbium(III) triflate (124 mg, 0.2 mmol) in acetonitrile (2 mL) was heated at 85° C. for 18 hours when the temperature was raised to reflux temperature and heating continued for a further 21 hours. The mixture was cooled to room temperature and partitioned between dichloromethane (50 mL) and aqueous sodium bicarbonate (50 mL). The aqueous layer was extracted again with dichloromethane (50 mL) and the combined organic extracts were dried over anhydrous sodium sulphate and evaporated. The residue was purified by silica gel chromatography using the Flashmaster II (50 g cartridge) eluting with a 1:1 cyclohexane:ethyl acetate gradient over 40 minutes to give the title compound as a white solid (424 mg).

Provenance & Evidence