4-ethyl 3-methyl rel-(3R,4S,5S)-2-oxo-3-piperonyloyl-5-(3,4,5-trimethoxyphenyl)tetrahydrofuran-3,4-dicarboxylate 在
四氯化锡 作用下,
以
氯仿 为溶剂,
反应 12.0h,
以91%的产率得到3-ethyl 2-methyl rel-(2R,3S,4R)-6,7-methylenedioxy-1-oxo-4-(3,4,5-trimethoxyphenyl)-1,2,3,4-tetrahydronaphthalene-2,3-dicarboxylate