4-(苄氧基)-3-氧代丁酸乙酯 、
2-bromo-1-(3-(cyclopentyloxy)-4-methoxyphenyl)ethanone 、
2-Bromo-1-(3-cyclopropylmethoxy-4-difluoromethoxyphenyl)ethanone 以respectively, whereby 9.49 g of the title compound was obtained as a yellowish oil的产率得到ethyl 4-benzyloxy-2-[2-(3-cyclopentoxy-4-methoxyphenyl)-2-oxoethyl]-3-oxobutyrate