We herein report an unprecedented photoinduced cyclization/defluorination domino process of N-allylbromodifluoroacetamide with cyclic secondaryamines. Consequently, a wide array of valuable 3-fluoro-1,5-dihydro-2H-pyrrol-2-ones were facilely prepared from readily available starting materials under mild conditions. Preliminary mechanistic investigations suggest that a radical chain propagation and
我们在此报告了N-烯丙基溴二氟乙酰胺与环状仲胺的前所未有的光致环化/脱氟多米诺骨牌过程。因此,在温和的条件下,从容易获得的起始材料中轻松制备了一系列有价值的 3-fluoro-1,5-dihydro-2 H -pyrrol-2-ones。初步的机理研究表明,自由基链增长和胺促进的脱氟途径可能参与了这种转变。
Cu-Catalyzed Aminodifluoroalkylation of Alkynes and α-Bromodifluoroacetamides
The copper-catalyzed highly regioselective aminodifluoroalkylation of alkynes and α-bromodifluoroacetamides was realized for the first time. With this method, 3,3-difluoro-1H-pyrrol-2(3H)-ones were constructed in a single step from various alkynes and α-bromodifluoroacetamides substrates without using any extra oxidant.
Tunablehalofluoroalkylation and hydrofluoroalkylation of 1,6‐enynes were first reported by switchingbetweencopper‐catalysis and photocatalysis, leading to the atom‐economic and highly stereoselective protocols toward functionalized 1‐indenones with moderate to good yields. Copper‐catalysis enabled the concomitant incorporation of two important fluoroalkyl and halo functionalities into 1‐indenone
Visible-Light-Triggered Difluoroacetylation/Cyclization of Chromone-Tethered Alkenes Enabling Synthesis of Tetrahydroxanthones
作者:Chengting Wang、Jingrui He、Haibo Mei、Ata Makarem、Jianlin Han
DOI:10.1021/acs.joc.4c00129
日期:2024.4.19
designed, and a radical cyclization reaction of these chromone derivatives has been achieved under photoredox conditions. The reaction uses bromodifluoroacetamides or bromodifluoroacetates as coupling partners, affording a broad range of functionalizedtetrahydroxanthone products with up to 85% yields. The reaction is triggered via the generation of difluoroacetate radicals or alkene radical cations with
Fluoroalkylative Ketonization of Malononitrile-Tethered Alkenes via Nickel Electron-Shuttle and Lewis Acid Catalysis
作者:Yangkun Zhou、Hanmin Huang
DOI:10.1021/acs.orglett.4c01415
日期:2024.5.31
efficient reductive dicarbofunctionalization of unactivatedalkenes with alkyl halides and malononitriles. The combination of Ni electron-shuttle catalysis with Eu(OTf)3, a non-redox-type Lewis acid, effectively activates the iminyl radicals, enabling the direct formation of the C(sp3)–C(sp3) bond and β-ketonitrile functionality across a variety of C═C double bonds. This reaction allows for the expedient