Photocatalytic Reductive Radical‐Polar Crossover for a Base‐Free Corey–Seebach Reaction
作者:Karsten Donabauer、Kathiravan Murugesan、Urša Rozman、Stefano Crespi、Burkhard König
DOI:10.1002/chem.202003000
日期:2020.10.9
abstraction of a hydrogen atom followed by radical reduction. The generated nucleophilic intermediate is then capable of adding to carbonyl electrophiles. The obtained dithiane can be easily converted to the valuable α‐hydroxy carbonyl in a subsequent step. The proposed reaction mechanism is supported by emission quenching, radical–radical homocoupling and deuterium labeling studies as well as by calculated
在有机合成中,无金属的碳负离子亲核体的产生至关重要。本文中,我们报告了一种对Corey–Seebach反应的光催化方法。提出的方法在温和的氧化还原中性和无碱条件下运行,从而提供具有高官能团耐受性的所需产品。通过光和氢原子转移(HAT)催化的组合可以实现反应。这种催化合并使CH可以通过夺取氢原子然后进行自由基还原来进行碳负离子活化。然后,所产生的亲核中间体能够加成至羰基亲电子体。在随后的步骤中,可以很容易地将获得的二噻吩转化为有价值的α-羟基羰基。所提出的反应机理得到了发射猝灭的支持,