反应详情

Using the same procedure as in Example 1(3), 3-(3-butoxy-4-methoxyphenyl)-4,4-diethoxy-2-ethoxycarbonylbutyric acid ethyl ester, instead of 3-(3,4-dimethoxyphenyl)-4,4-diethoxy-2-ethoxycarbonylbutyric acid ethyl ester, was used to obtain a yellow solid of the above-described compound via 3-(3-butoxy-4-methoxyphenyl)-4,4-diethoxybutyric acid (yield 47.5%).