A palladium-catalyzed intermolecular polarity-mismatched addition of unactivated alkyl radicals to unactivated alkenes was developed for the first time. In the two-component dicarbofunctionalization, a variety of primary, secondary, and tertiary unactivated alkyl halides regioselectively reacted with various unactivated olefins. A series of structurally complex heteropolycycles decorated with a quaternary
Palladium‐Catalyzed Intermolecular Dicarbofunctionalization of Unactivated Alkenes: Synthesis of Fluoroalkylated Heterocycles with All‐Carbon Quaternary Centers
The redox-neutral Pd-catalyzed dicarbofunctionalization of unactivatedalkenes with a variety of functionalized perfluoroalkyl halide is presented. This transformation enables the assembly of diversified fluoroalkylated pyrrolo[1,2-a]indoles with one all-carbon quaternary center in high regioselectivity. Mechanistic studies suggest the generation of perfluoroalkyl radicals from the single electron
Iron-Mediated Hydrogen Atom Transfer Radical Cyclization of Alkenyl Indoles and Pyrroles Gives Their Fused Derivatives: Total Synthesis of Bruceolline E and H
作者:Santosh J. Gharpure、Rupali S. Chavan、Simran R. Narang
DOI:10.1021/acs.orglett.4c00032
日期:2024.6.7
employed for the synthesis of dihydropyrroloindoles and dihydropyrrolizines via 5-exo-trig radical cyclization where indoles and pyrroles are used as an acceptor. This radical approach has also been extended for the synthesis of tetrahydrocyclopenta[b]indolones via the Baldwin-disfavored 5-endo-trig cyclization pathway. The formal synthesis of bruceolline J and the totalsynthesis of bruceollines E
铁介导的氢原子转移(HAT)反应可有效地用于通过 5- exo - trig自由基环化合成二氢吡咯并吲哚和二氢吡咯嗪,其中吲哚和吡咯用作受体。这种激进的方法还被扩展到通过鲍德温不喜欢的 5- end - trig环化途径合成四氢环戊[ b ]吲哚酮。采用前一种策略,布鲁斯酚J的正式合成以及布鲁斯酚E和H的全合成都已顺利进行。
Catalytic Carbon−Carbon σ Bond Activation: An Intramolecular Carbo-Acylation Reaction with Acylquinolines
作者:Ashley M. Dreis、Christopher J. Douglas
DOI:10.1021/ja8066308
日期:2009.1.21
Carbon-carbon sigma-bond activation is a contemporary challenge for organometallic chemistry and catalysis. Herein, we disclose a new alkene carboacylation reaction initiated by quinoline-directed, rhodium-catalyzed C-C sigma bond activation. The alkene carboacylation allows for the construction of all-carbon quaternary centers, with a broad substrate scope, providing access to carbocyclic and heterocyclic ring systems in good to excellent yields.