反应详情

Using the same procedure as in Example 1 (3), 4,4-diethoxy-2-ethoxycarbonyl-3-(4-methoxy-3-phenethyloxyphenyl)butyric acid ethyl ester, instead of 3-(3,4-dimethoxyphenyl)-4,4-diethoxy-2-ethoxycarbonyl butyric acid ethyl ester, was used to obtain a light yellow solid of above-described compound (51.4%) via 4,4-diethoxy-3-(4-methoxy-3-phenethyloxyphenyl)butyric acid (yield 51.4%).