Visible-Light Photo-Arbuzov Reaction of Aryl Bromides and Trialkyl Phosphites Yielding Aryl Phosphonates
作者:Rizwan S. Shaikh、Simon J. S. Düsel、Burkhard König
DOI:10.1021/acscatal.6b02591
日期:2016.12.2
Aryl phosphonates are functional groups frequently found in pharmaceutical and crop protection agents. For their synthesis via C–P bond formation typically transition-metal-catalyzed reactions are used. We report a visible-light photo-Arbuzov reaction as an efficient, mild, and metal-free alternative. Rhodamine 6G (Rh.6G) is used as the photocatalyst, generating aryl radicals under blue light. Coupling
芳基膦酸酯是在药物和农作物保护剂中经常发现的官能团。对于它们通过C–P键形成的合成,通常使用过渡金属催化的反应。我们报告可见光光Arbuzov反应是一种高效,温和且不含金属的替代物。罗丹明6G(Rh.6G)用作光催化剂,在蓝光下产生芳基。自由基与各种三价亚磷酸酯的偶联产生芳基膦酸酯,具有良好或非常好的分离产率。反应条件温和,可通过激活碳-卤素键将膦酸酯基团引入复杂而敏感的药物活性分子中,例如苯二氮卓类和麦角灵。