Synthesis of 3,5-Disubstituted 1,2-Dioxolanes through the Use of Acetoxy Peroxyacetals
作者:Alexis Pinet、Thuy Linh Nguyen、Guillaume Bernadat、Bruno Figadère、Laurent Ferrié
DOI:10.1021/acs.orglett.9b01616
日期:2019.6.21
The synthesis of acetoxyendoperoxyacetal derivatives allowed the formation of functionalized 3,5-disubstituted 1,2-dioxolanes through the formation of reactive peroxycarbenium species under Lewis acid mediation. The introduction of a neutral nucleophile such as allylsilane, silane, or silyl enol ether was accomplished with moderate to good yields. The two studied Lewis acids, TiCl4 and SnCl4, gave
乙酰氧基过氧缩醛衍生物的合成允许在路易斯酸介导下通过反应性过氧碳鎓物种的形成而形成官能化的3,5-二取代的1,2-二氧戊环。中性亲核试剂如烯丙基硅烷,硅烷或甲硅烷基烯醇醚的引入以中等至良好的产率完成。两种研究的路易斯酸TiCl 4和SnCl 4给出了相反的结果。在TiCl 4作为路易斯酸的实验中,对反式非对映异构体的更高的非对映选择性是由顺式异构体产物的更快降解引起的,这通常导致产率降低。计算结果支持了该结果的合理化。