3-(2-bromo-1,1-dimethoxy-ethyl)-benzoic acid methyl ester 、 Lithium Tert-butyl Acetate 以to give 3-oxo-3-[3-(2-bromo-1,1-dimethoxy-ethyl)-phenyl]-propionic acid tert-butyl ester (2.8 g) as a yellow oil的产率得到3-oxo-3-[3-(2-bromo-1,1-dimethoxy-ethyl)-phenyl]-propionic acid tert-butyl ester