Ghosh, Mangish and Mandal, Tirtha and Lepori, Mattia and Barham, Joshua P. and Rehbein, Julia and Reiser, Oliver (2024) Electrochemical Homo- and Crossannulation of Alkynes and Nitriles for the Regio- and Chemoselective Synthesis of 3,6-Diarylpyridines. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 63 (48). ISSN , 1521-3773
Full text not available from this repository. (Request a copy)Abstract
We disclose a mediated electrochemical [2+2+2] annulation of alkynes with nitriles, forming substituted pyridines in a single step from low-cost, readily available starting materials. The combination of electrochemistry and a triarylamine redox mediator obviates the requirements of transition metals and additional oxidants. Besides the formation of diarylpyridine moieties via the homocoupling of two identical alkynes, the heterocoupling of two different alkynes depending on their electronic nature is possible, highlighting the unprecedented control of chemoselectivity in this catalytic [2+2+2] process. Mechanistic investigations like cyclic voltammetry and crossover experiments combined with DFT calculations indicate the initial oxidation of an alkyne as the key step leading to the formation of a vinyl radical cation intermediate. The utilization of continuous flow technology proved instrumental for an efficient process scale-up. The utility of the products is exemplified by the synthesis of pi-extended molecules, being relevant for material or drug synthesis.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CATALYZED 2+2+2 CYCLOADDITION; METALATED PYRIDINES; MODULAR SYNTHESIS; 4+2 ANNULATION; DERIVATIVES; ACETYLENES; DISCOVERY; DIYNES; ALPHA,OMEGA-DIYNES; ELECTROSYNTHESIS; Cross-coupling; Chemoselective; Diarylpyridines; Electrochemical cycloaddition; Electro-flow; pi-extended molecules |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Jul 2025 08:27 |
| Last Modified: | 25 Jul 2025 08:27 |
| URI: | https://pred.uni-regensburg.de/id/eprint/63760 |
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