In:
Green Chemistry, Royal Society of Chemistry (RSC)
Abstract:
Environmentally friendly acid-catalyzed ynamide N–C sp bond cleavage, skeletal rearrangement and chemo-, regio- and stereospecific functionalization with nucleophiles are of great interest in synthetic chemistry. However, such transformations present remarkable regio- and stereospecific challenges due to the biased carbon–carbon (α and β) triple bonds in ynamides. Herein, we developed a greener and faster acid-catalyzed ynamide N–C sp bond fission, skeletal rearrangement and stereospecific functionalization with nucleophilic anisole derivatives to produce thermodynamically unstable challenging cis -alkene tethered indole scaffolds in a very short reaction time (5–10 min). The key features of this transformation are its transition-metal-free nature, broad scope, ease of handling, simple setup, mild reaction conditions, atom/step/time economy, and the gram-scale experiment. Most importantly, 13 C-isotope labeling experiments in mechanistic studies confirmed the alkyne-carbon position in the rearrangement process. The green chemistry metrics evaluation and EcoScale score (75 on a scale of 0–100) indicate that our transformation is safer, environmentally friendly, and economically feasible.
Type of Medium:
Online Resource
ISSN:
1463-9262
,
1463-9270
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1485110-6
detail.hit.zdb_id:
2006274-6
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