Oxy-allyl cations have been known as transient electrophilic species since they were first proposed as intermediates in the Favorskii rearrangement in 1894. Since that time, they also have been used as a mode of activation for [4 + 3] cycloadditions in a variety of natural product syntheses. In this manuscript, we describe a method for the interception of oxy-allyl cations with a diverse range of common
自从1894年氧-烯丙基阳离子首次被提出作为Favorskii重排的中间体以来,它就被称为瞬态亲电子物种。从那时起,它们还被用作多种[4 + 3]环加成反应的活化方式。
天然产物合成。在此手稿中,我们描述了一种用于拦截具有各种范围的常见亲核试剂的氧-烯丙基阳离子的方法,从而证明了该中间体作为活化的一般模式的价值。这种简单,温和的室温规程允许形成各种高价值的碳-碳和碳-杂原子键,这些键很容易结合在一系列环状和非环状酮体系中。还描述了开发对映选择性催化变体的初步努力。