Photocatalytic Deoxygenation of Sulfoxides Using Visible Light: Mechanistic Investigations and Synthetic Applications
作者:Aimee K. Clarke、Alison Parkin、Richard J. K. Taylor、William P. Unsworth、James A. Rossi-Ashton
DOI:10.1021/acscatal.0c00690
日期:2020.5.15
The photocatalytic deoxygenation of sulfoxides to generate sulfides facilitated by either Ir[(dF(CF3)ppy)2(dtbbpy)]PF6 or fac-Ir(ppy)3 is reported. Mechanistic studies indicate that a radical chain mechanism operates, which proceeds via a phosphoranyl radical generated from a radical/polar crossover process. Initiation of the radical chain was found to proceed via two opposing photocatalytic quenching
报道了通过Ir [(dF(CF 3)ppy)2(dtbbpy)] PF 6或fac -Ir(ppy)3促进的亚砜的光催化脱氧生成硫化物。机理研究表明,自由基链机理起作用,其通过由自由基/极性交叉过程产生的磷酰基自由基进行。发现自由基链的引发通过两种相反的光催化猝灭机理进行,从而提供互补的反应性。自由基脱氧过程的温和性质使得能够以通常的高分离收率还原多种官能化的亚砜,包括那些含有酸敏感基团的亚砜。