Synthesis of Ultraviolet Absorber UV-1130

A ultraviolet absorber, UV-1130, is prepared with o-nitroaniline, 3-(3-tert-butyl-4-hydroxy-phenyl)-propionic acid methyl ester and PEG-300 as main materials, and via Michael addition, dealkylation, diazotization, coupling, reduction, esterification and transesterification, the yield of product can be attained 70.7% based on o-nitroaniline. Intermediate 3-(3-tert-Butyl-4-hydroxy-phenyl)-propionic acid methyl ester is prepared by 2 steps, and screened out the corresponding dealkylation catalyst; the inorganic acid of diazotization is hydrochloric acid; in reduction n(intermediate 3)∶n(sodium hydrosulfite)∶n(sodium hydroxide)=1∶۶∶۱۰; the catalyst of transesterification is p-toluene sulfonic acid.