Br[C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH3:17])([CH3:16])[C:9]2[O:10][CH2:11][C:12]([CH3:15])([CH3:14])[N:13]=2)=[CH:4][CH:3]=1.C([Li])CCC.[Cl:23][CH2:24][CH2:25][CH2:26][C:27](Cl)=[O:28]>C1COCC1>[Cl:23][CH2:24][CH2:25][CH2:26][C:27]([C:2]1[CH:7]=[CH:6][C:5]([C:8]([CH3:17])([CH3:16])[C:9]2[O:10][CH2:11][C:12]([CH3:15])([CH3:14])[N:13]=2)=[CH:4][CH:3]=1)=[O:28]A solution of 4-bromo-α,α-dimethyl-α-(4,4-dimethyloxazolin-2-yl)toluene (10.0 g. 0.0338 mole), prepared in accordance with Example 2, in 400 mL THF is cooled to −78° C., n-butyllithium (16 mL, 0.042 mole) is added via syringe, and the mixture is stirred at −78° C. for 30 minutes. While keeping the temperature below −75° C., 4-chlorobutyryl chloride (14.4 g, 0.102 mole) in 30 mL THF is added dropwise, and the mixture is stirred at −78° C. for 30 minutes. The mixture is allowed to warm to −15° C. and is quenched with water. The product is extracted with methylene chloride, washed with saturated NaCl solution, dried over Na2SO4, and concentrated. The residue is cooled to 0° C., treated with minimal acetonitrile, and filtered, to afford 4-(4-chloro-1-oxobutyl)-α,α-dimethyl-α-(4,4-dimethyloxazolin-2-yl) toluene.
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