A two‐step reaction sequence is described for the asymmetric formal α‐propargylation of ketones. This approach takes advantage of an aminocatalyzed conjugate addition of ketones to alkylidene isoxazol‐5‐ones, followed by a controlled nitrosative degradation event. The target compounds can be accessed in broad scope, in moderate to good yields, perfect diastereocontrol and good to excellent enantioselectivity
对于酮的不对称形式α-炔丙基化,描述了一个两步反应序列。这种方法利用了将酮
氨基催化的共轭加成至亚烷基
异恶唑-5-酮中,然后进行受控的亚硝化降解事件。目标化合物可以在宽范围内获得,产率中等至良好,非对映异构控制完美,对映选择性良好至优异。