| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 | 
|---|---|---|---|---|
| —— | (4aα,9β,9aα,10α)-9-acetoxy-4,4-dimethoxy-4a,9,9a,10-tetrahydro-9,10-epoxyanthracen-1(4H)-one | 93969-62-1 | C18H18O6 | 330.337 | 
1-Acetoxyisobenzofuran (4) reacts regiospecifically with 4,4-dimethoxycyclohexa-2,5-dienone (p-benzoquinone monoacetal) (6) to yield a single [4π+2π] cycloadduct with endo stereochemistry. Treatment of this adduct (7) with sodium methoxide formed 1,10-dihydroxy-4,4-dimethoxy-4a,10- dihydroanthracen-9(4H)-one (12), which was oxidized by the Corey-Fleet reagent to afford 1-hydroxy-4-methoxyanthracene-9,10-dione. This model reaction illustrates the potential of this approach to the regiospecific synthesis of anthraquinones. Attempts to introduce methoxy substituents into the anthraquinone by using 4- and 7-methoxy-1-acetoxyisobenzofuran, isobenzofurans described for the first time, were less successful. This limitation is discussed.