An unprecedented α‐allylation of amines was achieved by combining palladium catalysis and visible‐light photoredox catalysis. In this dual catalysis process, the catalytic generation of allyl radical from the corresponding π‐allylpalladium intermediate was achieved without additional metal reducing reagents (redox‐neutral). Various allylation products of amines were obtained in high yields through
photoredox-catalyzed coupling of N-aryltetrahydroisoquinoline and Michael acceptors was achieved using Ru(bpy)3Cl2 or [Ir(ppy)2(dtb-bpy)]PF6 in combination with irradiation at 455 nm generated by a blue LED, demonstrating the trapping of visible light generated α-amino radicals. While intermolecular reactions lead to products formed by a conjugate addition, in intramolecular variants further dehydrogenation occurs
使用Ru(bpy)3 Cl 2或[Ir(ppy)2(dtb-bpy)] PF 6结合蓝色LED产生的455 nm辐射,实现N-芳基四氢异喹啉和Michael受体的光氧化还原催化偶联,表明捕获了可见光产生的α-氨基自由基。虽然分子间反应导致通过缀合物加成形成的产物,但是在分子内变体中发生进一步的脱氢,直接导致5,6-二氢吲哚并[2,1- a ]四氢异喹啉,这与潜在的免疫抑制剂有关。
PEROVSKITES FOR PHOTOCATALYTIC ORGANIC SYNTHESIS
申请人:San Diego State University Foundation
公开号:US20210402380A1
公开(公告)日:2021-12-30
Nature is capable of storing solar energy in chemical bonds via photosynthesis through a series of C—C, C—O and C—N bond-forming reactions starting from CO
2
and light. Direct capture of solar energy for organic synthesis is a promising approach. Lead (Pb)-halide perovskite solar cells reach 24.2% power conversion efficiency, rendering perovskite a unique type material for solar energy capture. We show that photophysical properties of perovskites is useful in photoredox organic synthesis. Because the key aspects of these two applications are both relying on charge separation and transfer. Here we demonstrated that perovskites nanocrystals are exceptional candidates as photocatalysts for fundamental organic reactions, i.e. C—C, C—N and C—O bond-formations. Stability of CsPbBr
3
in organic solvents and ease-of-tuning their bandedges garner perovskite a wider scope of organic substrate activations.
Anionic Cyclometalated Platinum(II) Tetrazolato Complexes as Viable Photoredox Catalysts
作者:Anna Maria Ranieri、Liam K. Burt、Stefano Stagni、Stefano Zacchini、Brian W. Skelton、Mark I. Ogden、Alex C. Bissember、Massimiliano Massi
DOI:10.1021/acs.organomet.8b00913
日期:2019.3.11
[Pt(CNC)(DMSO)] with the corresponding tetrazolato ligand. No emission from the platinum(II) complexes was detected at room temperature in solution, but the photophysical properties could be assessed in the solid state, where all the complexes display emission bands attributed to aggregates. The platinum(II) complexes were found to facilitate a range of fundamental classes of visible-light-mediated
作者:Thomas P. Nicholls、Liam K. Burt、Peter V. Simpson、Massimiliano Massi、Alex C. Bissember
DOI:10.1039/c9dt02533b
日期:——
photoactive rhenium(I) tricarbonylcomplexes featuring either tetrazolato or N-heterocyclic carbene (NHC) ligands to facilitate fundamental classes of visible-light-mediated photoredox-catalysed reactions. In this study, we demonstrate that these systems mediate representative atom-transfer radical addition, hydrodehalogenation, and α-amino C–H functionalisation reactions. These rhenium(I) complexes provide