2,5-Dimethoxyaniline (352.3 mg) was dissolved in 20 ml of tetrahydrofuran, and then 2.3 ml of n-butyl lithium (1.0 M solution in hexane), 3 ml of a solution of (16-bromohexadecyloxy)-t-butyldimethylsilane in tetrahydrofuran, and 0.20 ml of 1,4-dioxane were added to this solution at 0° C. The reaction mixture was refluxed for 24 hours while stirring. Saturated ammonium chloride solution was added to the reaction mixture, which was then extracted three times with dichloromethane. The organic layer was washed with saline solution and dried over magnesium sulfate, and the solvent was distilled off under reduced pressure. Purification of the residue by silica gel chromatography (heptane:ethyl acetate=7:3) gave [16-(t-butyldimethylsilanyloxy)hexadecyl]-(2,5-dimethoxyphenyl)amine as a yellow oil at a 50% yield.
