To a solution of ethyl[5-methoxy-2-(6-methoxy-1,2,3,4-tetrahydronaphthalen-2-yl)phenyl]amine (100 mg) in dichloromethane (3 ml) were sequentially added an aqueous solution of 1N sodium hydroxide (1 ml) and phenylacetyl chloride (0.06 ml) on an ice bath, and the solution was stirred overnight while warming to room temperature. To the reaction solution was added water, the solution was extracted with ethyl acetate, then washed with brine, dried over anhydrous magnesium sulfate, and then the solvent was evaporated in vacuo to provide the title compound (140 mg).
