NOVELTY - In an autoclave, diaryl iodonium salt (I) and amine compound (II) as raw material are added and reacted in presence of a base as accelerator and organic solvent, in carbon dioxide atmosphere, stirred at 40-150 degrees C for 2-24 hours, cooled to room temperature, filtered, and the solvent is evaporated to obtain crude product. The obtained crude product is purified by column chromatography to obtain aromatic amino acid ester compound (III). The amine compound (II) is pyrrolidine, piperidine or morpholine.    USE - Preparation of aromatic amino acid ester compound used for preparing pesticides and medicine, and in natural product synthesis.    ADVANTAGE - The method efficiently and safely provides aromatic amino acid ester compound with high yield, by simple method, without using phosgene or isocyanate and without affecting the environment.    DETAILED DESCRIPTION - In an autoclave, diaryl iodonium salt of formula (I) and amine compound of formula (II) as raw material are added and reacted in presence of a base as accelerator and organic solvent, in carbon dioxide atmosphere, stirred at 40-150 degrees C for 2-24 hours, cooled to room temperature, filtered, and the solvent is evaporated to obtain crude product. The obtained crude product is purified by column chromatography to obtain aromatic amino acid ester compound of formula (III). The amine compound (II) is pyrrolidine, piperidine or morpholine.    Ar1, Ar2=phenyl, p-bromophenyl, m-bromophenyl, o-bromophenyl, p-tolyl, p-phenyl, p-chlorophenyl, m-chlorophenyl, o-chlorophenyl cyano, o-cyanophenyl, trifluoromethylphenyl, nitrophenyl, o-nitrophenyl, m-nitrophenyl, p-t-butyl-phenyl, O-isopropylphenyl, m-methylphenyl, o-methylphenyl, 2,5-dimethylphenyl, 2,4,6-trimethylphenyl, 2,4,6-triisopropyl-phenyl or p-methoxyphenyl;    X=trifluoromethanesulfonic acid group, toluene sulfonic acid group, tetrafluoroborate group, chloro or bromo;and    R1,R2=H, methyl, ethyl, propyl, isopropyl, cyclohexyl, n-butyl, benzyl or allyl.