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Synthesis 2024; 56(04): 585-596
DOI: 10.1055/a-2063-0221
DOI: 10.1055/a-2063-0221
special topic
Synthetic Development of Key Intermediates and Active Pharmaceutical Ingredients (APIs)
An Intramolecular Radical C–N Coupling by N-Iodosuccinimide
S.K.B. and R.B. thank DST (INSPIRE) and CSIR (India) for fellowships.
Abstract
A useful method for the formation of benzimidazole-fused phenanthridines through an intramolecular coupling of unactivated C(sp2)–H and N(sp3)–H bonds using N-iodosuccinimide (NIS) in trifluoroethanol (TFE) is presented. The synthesis of benzo[4,5]imidazo[1,2-f]phenanthridines from 2-([1,1′-biphenyl]-2-yl)-1H-benzo[d]imidazole derivatives is mild, efficient, and sustainable, with high yields and minimal waste generation. The control experiments and EPR studies were aimed at rationalizing the radical pathway of the reaction. Specifically, the use of 1,1-diphenylethylene, TEMPO, BHT, and DMPO as a free-radical spin-trapping reagent in EPR studies, allowed us to conceive a radical pathway. The gram-scale synthesis further supported the practical utility of the methodology for the field of synthetic chemistry.
Key words
benzimidazole-fused phenanthridines - C–N coupling - TFE - N-iodosuccinimide - radical cyclizationSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/a-2063-0221. Control experiments, characterization data, and NMR spectra are included.
- Supporting Information
Publikationsverlauf
Eingereicht: 14. Februar 2023
Angenommen nach Revision: 27. März 2023
Accepted Manuscript online:
27. März 2023
Artikel online veröffentlicht:
20. April 2023
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