Acridine Photocatalysis: Insights into the Mechanism and Development of a Dual-Catalytic Direct Decarboxylative Conjugate Addition
作者:Hang T. Dang、Graham C. Haug、Vu T. Nguyen、Ngan T. H. Vuong、Viet D. Nguyen、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/acscatal.0c03440
日期:2020.10.2
Conjugate addition is one of the most synthetically useful carbon–carbon bond-forming reactions; however, reactive carbon nucleophiles are typically required to effect the addition. Radical conjugate addition provides an avenue for replacing reactive nucleophiles with convenient radical precursors. Carboxylic acids can serve as simple and stable radical precursors by way of decarboxylation, but activation
共轭加成是合成中最有用的碳-碳键形成反应之一;然而,通常需要反应性碳亲核试剂来实现加成。自由基共轭加成提供了一种用方便的自由基前体取代反应性亲核试剂的途径。羧酸可以通过脱羧作用作为简单而稳定的自由基前体,但通常需要活化成反应性酯以促进具有挑战性的脱羧作用。在这里,我们报告了多种羧酸的直接双催化脱羧自由基共轭加成,不需要酸预活化,并且通过可见光驱动的吖啶光催化与有效的铜催化循环相结合来实现。