On 1n,π*-excitation, the title compound 2 undergoes a photoinduced intramolecular [4 + 2]-cycloaddition affording the tetracyclic enol ether 3 as the only product in 79% yield. The assigned structure of 3 was confirmed by its conversion to the p-nitrobenzoate 6 whose structure was determined by X-ray analysis.
在1 n,π*激发下,标题化合物2进行光诱导的分子内[4 + 2]-环加成,得到四环烯醇醚3作为唯一产物,产率为79%。通过将其转化为
对硝基苯甲酸酯6来确认3的指定结构,该
对硝基苯甲酸酯6的结构通过X射线分析确定。