Thermal [2 + 2]-Cycloaddition of Ketenes with Chiral Enol Ethers: Route to Densely Substituted Cyclobutanones
作者:Pauline Rullière、Julien Grisel、Clément Poittevin、Pascale Cividino、Sébastien Carret、Jean-François Poisson
DOI:10.1021/acs.orglett.6b01058
日期:2016.6.17
polysubstituted cyclobutanones by [2 + 2]-cycloaddition of ketenes with chiral acyclic enol ethers is reported. A wide variety of easily accessible di- and monosubstituted ketenes were found to react with a very high degree of stereoselectivity with chiral, Stericol derived, acyclic enol ethers. This combination of simple reagents provides straightforward entry to highly substituted enantioenriched
据报道,乙烯酮与手性无环烯醇醚的[2 + 2]-环加成反应获得了手性多取代的环丁酮。发现各种易于获得的二取代和单取代的烯酮与手性,三羟甾醇衍生的无环烯醇醚以非常高的立体选择性反应。简单试剂的这种组合提供了直接进入高度取代的对映体富集的环丁酮的途径。