已经开发出一种用于对映选择性制备轴向手性 2-萘基吡咯的简单方法。该方案基于 Cu I /Fesulfos 催化的甲亚胺叶立德的高度对映选择性 1,3-偶极环加成,然后进行吡咯烷烷基化和吡咯烷氧化为吡咯。 DDQ/蓝光介导的芳构化过程中采用的温和条件促进了有效的中心到轴的手性转移,为相应的吡咯提供了高的对映选择性。
Three naphthalene-based analogues (4 a-c) of the Hoveyda-Grubbsmetathesiscatalyst exhibited immense differences in reactivity. Systematic structural and spectroscopic studies revealed that the ruthenafurane ring present in all 2-isopropoxyarylidene chelates possesses some aromatic character, which inhibits catalystactivity. This aromatic stabilization within the chelate ring may be controlled by