Photoredox-Catalyzed Defluorinative Carboxylation of <i>gem</i>-Difluorostyrenes with Formate Salt
作者:Chao Sun、Quan Zhou、Chuan-Ying Li、Zhong-Wei Hou、Lei Wang
DOI:10.1021/acs.orglett.3c04071
日期:2024.2.2
Herein, we present a transition-metal-free, easy handling protocol for regioselective carboxylation of gem-difluorostyrenes with sodium formate as the C1 source. 30 examples of α-fluoracrylates were obtained in yields of 30 to 80% under these conditions. A defluorinative monofluorovinyl intermediate and consecutive photoinduced electron transfer mechanism were proposed after mechanism investigation
Photocatalytic syntheses of gem-difluoroolefins were performed using the B12–TiO2 hybrid catalyst during the CC bondreduction of α-trifluoromethyl styrenes with C–F bondcleavage at room temperature under nitrogen. The gem-difluoroolefins were used as synthetic precursors for fluorinated cyclopropanes.