Oxidative alkene difunctionalization reactions are important in synthetic organic chemistry because they can install polar functional groups onto simple non-polar alkene moieties. Many of the most common methods for these reactions rely upon the reactivity of pre-oxidized electrophilic heteroatom donors that can often be unstable, explosive, or difficult to handle. Herein, we describe a method for alkene oxyamination and diamination that utilizes simple carbamate and urea groups as nucleophilic heteroatom donors. This method uses a tandem copper–photoredox catalyst system that is operationally convenient. The identity of the terminal oxidant is critical in these studies. Ag(I) salts proved to be unique in their ability to turn over the copper cocatalyst without deleteriously impacting the reactivity of the organoradical intermediates.
氧化烯烃双官能团化反应在合成有机化学中很重要,因为它们可以将极性官能团安装到简单的非极性烯烃基团上。这些反应的许多常见方法依赖于预氧化的亲电杂原子供体的反应性,这些供体通常不稳定、易爆炸或难以处理。在这里,我们描述了一种利用简单的碳酸酯和尿素基团作为亲核杂原子供体的烯烃氧胺化和二胺化方法。该方法使用串联铜-光氧化还原催化剂体系,操作方便。在这些研究中,末端氧化剂的身份至关重要。Ag(I)盐被证明在不损害有机自由基中间体的反应性的情况下,具有独特的能力来促使铜共催化剂周转。