Fluorescence sensing of Cu(II) based on trisphaeridine derivatives

Caballero, Alegría; Campos, Pedro J.; Rodrı́guez, Miguel A.

doi:10.1016/j.tet.2013.04.009

Cited by 12 publications

(1 citation statement)

References 30 publications

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“…This approach has been employed with biaryl aldehydes and O -4-cyanobenzoyl hydroxylamine to afford phenanthridines, as exemplified by a two-step gram-scale synthesis of trisphaeridine, an alkaloid possessing antitumor and antiretroviral properties (Scheme ). − This procedure represents an improvement over the previous best-in-class synthetic route to trisphaeridine, which requires four synthetic steps from the same aryl bromide 89 and provides trisphaeridine ( 92 ) in 29% overall yield …”

Section: Nitrogen-centered Radicals Can Be Generated From Nitrogen–ox...mentioning

confidence: 99%

Strategies to Generate Nitrogen-centered Radicals That May Rely on Photoredox Catalysis: Development in Reaction Methodology and Applications in Organic Synthesis

et al. 2021

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For more than 70 years, nitrogen-centered radicals have been recognized as potent synthetic intermediates. This review is a survey designed for use by chemists engaged in target-oriented synthesis. This review summarizes the recent paradigm shift in access to and application of N-centered radicals enabled by visible-light photocatalysis. This shift broadens and streamlines approaches to many small molecules because visible-light photocatalysis conditions are mild. Explicit attention is paid to innovative advances in N−X bonds as radical precursors, where X = Cl, N, S, O, and H. For clarity, key mechanistic data is noted, where available. Synthetic applications and limitations are summarized to illuminate the tremendous utility of photocatalytically generated nitrogen-centered radicals. CONTENTS 1. Introduction 2354 2. Nitrogen-centered Radicals Can Be Generated from Nitrogen−Chlorine Bonds in the Presence of Photoredox Catalysts 2357 3. Nitrogen-centered Radicals Can Be Generated from Nitrogen−Nitrogen Bonds within N-Aminopyridinium Salts in the Presence of Photoredox Catalysts 2359 4. Nitrogen-centered Radicals May Be Generated from Nitrogen−Sulfur Bonds 2363 5. Nitrogen-centered Radicals Can Be Generated from Nitrogen−Oxygen Bonds 2364 5.1. Iminyl Radicals Can Be Generated from O-Aryl and O-Acyl Oxime Analogues 2364 5.1.1.Radicals Prepared from O-Aryl or O-Acyl Oximes Can Add Across Olefins 2364 5.1.2. Radicals Prepared from O-Acyl Oximes Can Cyclize onto Arenes or Vinyl Arenes 2366 5.1.3. Radicals Prepared from O-Acyl Oximes Can Abstract Hydrogen Atoms 2367 5.2. Hydroxyacid-derived Oximes Are Appropriate Precursors to Iminyl Radicals 2368 5.2.1. These Iminyl Radicals Can Serve as Intermediates in Iminofunctionalization Reactions 2368 5.2.2. Hydroxyacid-derived Iminyl Radicals Can React with Chalcogens to Install New Chalcogen−Nitrogen Bonds 2370 5.3. Ketoximes and Aldoximes Can Serve as Precursors to Persistent Iminyl Radical Intermediates 2371 5.4. Iminyl Radicals That Are Generated from Strained Cyclic Oximes Can Engage in Ringopening Cascade Reactions 2374 5.4.1. These Ring-opening Cascades Are Wellestablished Strategies to Affect Distal Carbofunctionalization Reactions Involving Olefins 2374 5.4.2. By Using Hydroxyacid-derived Oxime Substrates, Ring-Opening Cascades Can Result in Direct Atom-or Group-transfer Processes 2375 5.4.3. Ring-opening Cascades Can Trigger Alkene Carbofunctionalization Reactions 2376 5.4.4. Ring-opening Cascades Can Be Intercepted by Transition-metal Mediated Bond-forming Processes 2378 5.4.5. Ring-opening Cascades Can Rely on O-Acyl Cyclic Oxime Substrates to Affect Alkene Carboetherification Reactions 2379

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Section: Nitrogen-centered Radicals Can Be Generated From Nitrogen–ox...mentioning

confidence: 99%