2-Bromoethanol → N-Ethyl-N-(beta-hydroxyethyl)-4-bromoaniline

17.3 g (86.7 mmols) of N-ethyl-4-bromoaniline, 22.7 ml (1.5-fold equivalent weight) of N,N-diisopropylethylamine and 9.64 ml (1.5-fold equivalent weight) of 2-bromoethanol were mixed, and the mixture obtained was heated at 125° C. for 2 hours in an atmosphere of argon. Next, to the reaction solution obtained, 1.5 ml (0.1-fold equivalent weight) of diisopropylethylamine and 0.64 ml (0.1-fold equivalent weight) of 2-bromoethanol were added, and the mixture obtained was heated at 125° C. for 3 hours in an atmosphere of argon. Water was added to the reaction solution obtained, which was then extracted with ethyl acetate. The organic layer obtained was dried with anhydrous magnesium sulfate and then concentrated. The residue thus obtained was purified by silica gel column chromatography developing system (chloroform) to obtain 14.7 g of N-ethyl-N-(2-hydroxyethyl)-4-bromoaniline (yield: 69.5%; a colorless oily liquid).