Deal;Photoredox Catalysis for the Cycloaddition Reactions

Abstract

Cycloaddition reaction is a powerful tool for the synthesis of cyclic structures in a green way. High‐energy ultraviolet (UV) light was strictly required for the traditional photochemical processes. However, in the past ten years, discovery of photoredox catalysis for the cycloaddition reactions have attracted significant attention. Based on these elegant works, this review will summarize recent progresses in the visible‐light‐induced [2+2] and [4+2] cycloaddition reactions.

Photochemical reduction of carbon dioxide to formic acid

“…Moreover, the efforts will also be not limited to metal-based complexes, rather they will also focus on some metal-free catalysts owing to their cheaper price and easy availability. [119][120][121][122][123][124][125][126][127][128][129][130][131][132][133][134][135] Although extensive efforts are being made to achieve high reactivity, metal-based catalysts still have some drawbacks. Firstly, the reported results vary immensely, even when the same metal centre has been used.…”

Editorial: The Catalysis of Ring Synthesis

“…In the Review paper by Neto and Zeni the diverse variety of synthesis of pyrrole derivatives using the reaction of alkynes with nitrogen‐compounds under transition metal‐catalyzed and metal‐free conditions, is presented [2] . A Minireview from the group of Das reflects the impressive state of the art in photoredox catalysis and the recent applications of photocatalysis to [2+2] and [4+2] cycloaddition reactions under the irradiation of visible light [3] …”

“…[2] A Minireview from the group of Das reflects the impressive state of the art in photoredox catalysis and the recent applications of photocatalysis to [2 + 2] and [4 + 2] cycloaddition reactions under the irradiation of visible light. [3] Efficient organocatalyzed and/or transition-metal-catalyzed synthesis of azirine, pyridine, piperidine, indole, indoxyl, benzimidazole, carbazole, spiro pyrrolidone, γ-(thio)butyrolactone, quinolone derivatives and oligocyclic systems are reported in a total of 12 Communications. A highly efficient enantioselective organocatalytic synthesis of trisubstituted [a]…”

Visible Light-Induced Aerobic Oxidative Dehydrogenation of C–N/C–O to C=N/C=O Bonds Using Metal-Free Photocatalysts: Recent Developments

“…Among all the photocatalysts, transition metal-based compounds [11][12][13][14], metal-free molecules [3,[15][16][17][18][19] and semiconductors [20,21] are the most utilized. These promoters have been applied successfully to many photochemical transformations, such as oxidations [22][23][24][25][26], cycloadditions [27][28][29][30], C-H bond functionalizations [31][32][33][34], photoredox reactions [6,16,17,[35][36][37][38][39][40][41][42][43] and even enantioselective reactions [44][45][46][47][48][49][50][51]. In addition, other effective photocatalysts have been widely applied for photocatalysis in energy and environment [52][53]…”