反应详情

A stirred, cooled (ice bath) solution of 4-bromo-2-tert-butyl-5-methyl-phenol (Intermediate 139, 0.85 g, 3.5 mmol) in anhydrous dichloromethane (7 mL) was treated with titanium tetrachloride (0.64 mL, 5.8 mmol) followed by α,α-dichloro methyl ether (0.3 g, 3.5 mmol). The reaction mixture was allowed to warm to ambient temperature for 4 h. The reaction mixture was diluted with diethyl ether, washed with brine (×1) and dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to a residue which was subjected to flash column chromatography over silica gel (230–400 mesh) using 1% ethyl acetate in hexane to afford the title compound as a yellow solid (0.58 g, 61%).

1. washwashed with brine (×1)
2. dry with materialdried over anhydrous sodium sulfate
3. filtrationfiltered
4. customevaporated in vacuo to a residue which