accessible position, retaining the more hindered secondary boronic ester. In contrast, we have found that photoredox-catalyzed mono-deboronation generates primary β-boryl radicals that undergo rapid 1,2-boron shift to form thermodynamically favored secondary radicals, allowing for selective transformation of the more hindered boronic ester. The pivotal 1,2-boron shift, which has been demonstrated to be stereoretentive
1,2-双
硼酸酯是多功能中间体,可以快速制备简单的烯烃前体。先前关于其选择性单官能化的报告针对的是最容易接近的位置,保留了受阻更多的仲
硼酸酯。相比之下,我们发现光氧化还原催化的单脱
硼作用会产生初级 β-
硼基自由基,这些自由基经历快速的 1,2-
硼转移以形成热力学有利的二级自由基,从而允许更多受阻
硼酸酯的选择性转化。已被证明具有立体保留性的关键 1,2-
硼位移能够获得广泛的官能化
硼酸酯,并已应用于高度非对映选择性断裂和跨环环化反应。此外,