through an organophosphorus-catalyzed borylative ring-opening/allylation of vinylcyclopropanes providing δ-hydroxy esters stereoselectively. The δ-hydroxy esters were lactonized to obtain densely substituted δ-valerolactones. The present methodology exhibited enhanced functional group tolerance compared to the existing metal-mediated methods. A plausible mechanism for borylative ring-opening reaction
我们通过有机
磷催化的
乙烯基环丙烷的
硼基化开环/烯丙基化立体选择性地提供 δ-羟基酯,报告了一种操作简单的
δ-戊内酯途径。δ-羟基酯被内酯化以获得密集取代的
δ-戊内酯。与现有的
金属介导方法相比,本方法表现出增强的官能团耐受性。已经提出了一种可能的
硼酸化开环反应机制。31 P NMR 研究表明
磷鎓两性离子种类的参与。证明了中间体
硼酸烯
丙酯的合成效用。