A visible-light-induced radical cyclization reaction of o-vinylaryl isocyanides and oxime esters to access various 2,4-disubstituted quinolines was disclosed. Oxime esters were employed as acyl radical precursors via the carbon–carbon bond cleavage. It provided an effective way for the synthesis of 2-acyl-4-arlysubstituted quinolines under mild conditions and exhibited good functional group tolerance
FeF3‐Promoted Radical Fluoroalkylation of o‐Alkenylaryl Isocyanides to Access 2‐Fluoroalkylated Quinolines
作者:Xin‐Yin Zhou、Wei‐Ming Zhang、Cheng‐Wei Lu、Hua‐Hua Wang、Xiao‐Hong Zhang、Xing‐Guo Zhang、Hai‐Yong Tu
DOI:10.1002/ejoc.202400434
日期:2024.8.12
fluoroalkylation was developed. In the presence of FeF3 and Cs2CO3, a variety of o-alkenylaryl isocyanides smoothly underwent the radical fluoroalkylation with perfluoroalkyliodides to afford biologically important 2-fluoroalkylated quinolines in 38–81 % yields. Moreover, the conditions are compatible with nonfluorinated alkyl iodides leading to 2-alkylated quinolines.
开发了一种通过铁(III)促进的自由基氟烷基化制备喹啉的有效方法。在 FeF 3和 Cs 2 CO 3存在下,多种邻烯基芳基异氰化物顺利地与全氟烷基碘化物进行自由基氟烷基化,以 38-81% 的产率提供具有生物学意义的重要的 2-氟烷基化喹啉。此外,该条件与产生2-烷基化喹啉的非氟化烷基碘相容。
De Novo Synthesis of 2,2′-Bipyridines and Related Bis-azines via Cascade Coupling and Double Pyridannulation of Isocyanides
Herein, we present a new and general protocol for the assembly of 2,2′-bipyridyls from nonpyridine substrates without using any metal catalysts or organometallic reagents. The process starts from the coupling of two 1,3-dienyl isocyanides followed by a 6π-electrocyclization/aromatization cascade featuring the simultaneous formation of two pyridinerings in a single operation. Notably, this strategy