Visible light induced intermolecular [2+2]-cycloaddition reactions of 3-ylideneoxindoles through energy transfer pathway

Visible‐Light‐Driven Photoredox Catalysis in the Construction of Carbocyclic and Heterocyclic Ring Systems

“…[17] Although the assignment of a detailed mechanism awaits further investigation, an energy transfer pathway has been proposed to explain this process. [17] Although the assignment of a detailed mechanism awaits further investigation, an energy transfer pathway has been proposed to explain this process.…”

Von Steinkohlenteer bis zu Krebsmedikamenten

“…In addition to the SET process, the Yoon group12c and our laboratory12d have independently exploited an energy transfer (ET) process12 for visible‐light‐photocatalytic [2+2] cycloadditions. As part of our ongoing projects on photocatalysis13 and tandem catalysis,14 we wondered whether we could develop a phototandem catalysis that combines two mechanistically distinct processes (e.g.…”

Synthesis of [3.4]‐Spirooxindoles through Cascade Carbopalladation of Skipped Dienes

“…Notwithstanding the relevance of [3.4]‐spirooxindoles bearing a cyclobutyl moiety in their core structure, the studies focused on their synthesis are relatively scarce. The main methods reported in the literature include: a) 3,3‐dialkylation of the oxindole skeleton with 1,3‐dihalopropane (route a , Scheme ); b) the intramolecular cyclization of N ′‐phenylcyclobutanecarbohydrazide at high temperature (route b , Scheme ); and c) [2+2] cycloaddition reactions based on the use of activated 3‐methylene oxindole derivatives (route c , Scheme ) . Other approaches based on Pd‐catalyzed or mediated intramolecular C−H functionalization afford spirooxindoles where two carbons of the cyclobutyl ring belong to an aryl group (route d , Scheme ) .…”