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A 2023 method turns an indene—a carbocyclic precursor—into an isoquinoline by inserting a nitrogen atom into its five-membered ring. Instead of assembling the heterocycle from separate fragments, the reaction edits an existing carbon framework. The reported approach uses phenyliodine(III) diacetate (PIDA) and ammonium carbamate, and its demonstrated scope includes varied indene substitution patterns, nitrogen-15 labelling, and an extension to cyclopentadienes.
What changes in the skeletal edit?
Indenes contain a fused-ring carbon framework. In the reported transformation, nitrogen is inserted into the five-membered ring of an indene, converting that ring system into an isoquinoline. The strategic difference is that the ring framework is already present in the starting material: the reaction modifies its skeleton rather than constructing the heterocycle by joining separate fragments.
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The work by Patrick Finkelstein, Julia C. Reisenbauer, Bence B. Botlik, Ori Green, Andri Florin, and Bill Morandi was published in Chemical Science in 2023. The authors present the reaction as an alternative to approaches that build isoquinolines from pre-oxidized building blocks and amines, or oxidize di- or tetrahydroisoquinolines. That comparison reflects the paper’s discussion, not a comprehensive assessment of every current isoquinoline synthesis. Read the Royal Society of Chemistry article.
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How is nitrogen inserted?
The reported reagent combination is phenyliodine(III) diacetate (PIDA) and ammonium carbamate, which supplies the nitrogen. This is an oxidative nitrogen-insertion reaction, not a transition-metal-catalysed process, according to the report. The authors describe the protocol as convenient, but the article’s broad takeaway is the transformation’s strategy—not that it is universally simple to run or suitable for every indene.
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Chemistry World describes the proposed pathway as proceeding through an iodonitrene intermediate. That is a mechanistic description attributed to the secondary report; it should not be taken as a complete account of the primary paper’s mechanistic evidence. The report also says the team tested 25 indene precursors. Chemistry World’s coverage.
What substrates and products were demonstrated?
The authors report isoquinolines with varied substitution patterns and tolerated functional groups among the substrates they examined. This supports the method’s usefulness across the reported examples, but it does not establish that all indenes or all functional groups are compatible.
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Extension to pyridines
The reaction was also extended to cyclopentadienes, furnishing corresponding pyridines. This shows that the nitrogen-insertion concept was demonstrated on another starting ring system, while the published result remains bounded to the examples in the paper.
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The authors used 15NH4Cl as a nitrogen-15 source to prepare labelled isoquinolines. This offers an isotopically labelled product using the same general skeletal-editing idea; it is a demonstrated labelling route, not evidence of a particular downstream biological or drug-development benefit.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When is this route strategically useful?
The central choice is whether a suitable indene is a better starting point than assembling the isoquinoline from more prefunctionalized pieces. The method is most distinctive when late-stage nitrogen insertion into an existing carbon framework, access to the reported substitution patterns, or nitrogen-15 labelling is useful. Its direct extension to cyclopentadienes also suggests a related route to pyridines.
The paper places this approach alongside older oxidative-cleavage methods and more direct methods that can have substrate or reagent limitations. Those comparisons are the authors’ context for the work; they do not amount to a head-to-head comparison of yields, operational simplicity, or scope across all alternatives. The primary article was first published on 23 February 2023. Publisher metadata and publication details.
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