Litseadioxanins A and B, the so far only known natural products with a dihydrodioxine ring at the terminal of a side chain, were synthesized for the first time. The peroxy functionality was installed via a photo [4 + 2] cycloaddition of O2 to a multifunctional terminal 1,3-diene, a subtype of the reaction that has only a limited number of simple precedents (mostly monofunctional/with a much shorter
迄今为止,仅合成了迄今仅已知的在侧链末端具有二
氢二
氧杂
环丁烷环的
天然产物Litseadioxanins A和B。过
氧官能团是通过O 2的光[4 + 2]环加成到多功能末端1,3-二
烯的反应而安装的,该反应的子类型仅具有有限的简单先例(主要是单官能的/具有短得多的烷基)链)中的文献。人们发现LED优于传统的
汞或
钨灯,不仅产量更高,而且大大简化了操作。还首次合成了litseadioxanins的二
烯前体(也是
天然产物)。借助合成样品,以前未知的[α] D浓度/时间依赖性 这些二
烯被揭示出来。