Rearrangement of an Intermediate Cyclopropyl Ketene in a Rh<sup>II</sup>-Catalyzed Formal [4 + 1]-Cycloaddition Employing Vinyl Ketenes as 1,4-Dipoles and Donor–Acceptor Metallocarbenes
作者:Kevin X. Rodriguez、Nicolai Kaltwasser、Tiffany A. Toni、Brandon L. Ashfeld
DOI:10.1021/acs.orglett.7b00618
日期:2017.5.19
formal [4 + 1]-cycloaddition approach toward spirooxindole cyclopentenones is described. The diastereoselective cyclopropanation of vinyl ketenes with diazooxindoles as C1 synthons initiated a relatively mild formal [1,3]-migration of an intermediate cyclopropyl ketene to provide spirooxindoles in good to excellent yields (36–99%).
描述了一种Rh II催化的螺环吲哚环戊烯酮的正式[4 +1]-环加成方法。乙烯基烯酮与重氮恶吲哚作为C1合成子的非对映选择性环丙烷化引发了中间体环丙基烯酮的相对温和的形式[1,3]迁移,从而以良好的产率(36%至99%)提供了螺硫醇。