Diastereoselective Synthesis of Spirobarbiturate-Cyclopropanes through Organobase-Mediated Spirocyclopropanation of Barbiturate-Based Olefins with Benzyl Chlorides
作者:Xixi Song、Junbiao Chang、Yuanyuan Zhu、Shuang Zhao、Minli Zhang
DOI:10.1055/s-0037-1609637
日期:2019.2
Abstract The organobase-mediated diastereoselective spirocyclopropanation of barbiturate-based olefins with 2,4-disubstituted benzyl chlorides has been developed. The reactions were carried out efficiently to afford the desired spirobarbiturate-cyclopropanes in up to 95% yield with more than 20:1 dr in favor of anti-isomers. In order to extend synthetic utility of the spiro-products, a Lewis acid induced
摘要 已经开发了具有2,4-二取代的苄基氯的巴比妥酸酯基烯烃的有机碱介导的非对映选择性螺环丙烷化。有效地进行反应,以高达95%的产率提供所需的螺环巴比妥酸酯-环丙烷,有利于抗异构体,大于20:1dr 。为了扩展螺产物的合成效用,还证明了路易斯酸诱导的环丙烷-环-膨胀异构化。 已经开发了具有2,4-二取代的苄基氯的巴比妥酸酯基烯烃的有机碱介导的非对映选择性螺环丙烷化。有效地进行反应,以高达95%的产率提供所需的螺环巴比妥酸酯-环丙烷,有利于抗异构体,大于20:1dr 。为了扩展螺产物的合成效用,还证明了路易斯酸诱导的环丙烷-环-膨胀异构化。