[Si:1](Cl)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[F:9][C:10]1[CH:15]=[CH:14][CH:13]=[CH:12][C:11]=1[C:16]([CH3:20])([CH3:19])[CH2:17][OH:18].N1C=CN=C1>CN(C=O)C>[C:4]([Si:1]([O:18][CH2:17][C:16]([C:11]1[CH:12]=[CH:13][CH:14]=[CH:15][C:10]=1[F:9])([CH3:20])[CH3:19])([CH3:3])[CH3:2])([CH3:7])([CH3:6])[CH3:5]tert-Butyldimethylsilyl chloride (1.4 g) was added portionwise to a stirred solution of 2-(2-fluorophenyl)-2-methylpropan-1-ol (example 90, step d) (1.3 g) and imidazole (0.631 g) in DMF (7 mL) at 20° C. The reaction mixture was stirred for 3 hours at room temperature and then partitioned between ethyl acetate and brine. The organic layer was washed twice with brine, dried over sodium sulphate, filtered and the solvent evaporated under reduced pressure. The crude product was purified by flash silica chromatography, elution gradient 100% isohexane to 1% diethyl ether in isohexane. Pure fractions were evaporated to dryness to afford the subtitled compound. Yield 1.4 g.
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