Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 364, Issue 21, Pages 3736-3742Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.202200886
Keywords
Benzannulation; Methyl(methylene)sulfonium ion; beta-Ketoenamines; Aniline derivatives; Pyridines
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Funding
- CSIR [02(0444)/21/EMR-II]
- SERB [EMR/2017/002827]
- Government of India
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The benzannulation and N-annulation of beta-ketoenamines using the in-situ generated methyl(methylene)sulfonium ion from the reaction of DMSO and DBE was achieved. This reaction provides a novel method for synthesizing pyridine derivatives and substituted anilines.
Benzannulation and N-annulation of beta-ketoenamines by the in-situ generated methyl(methylene)sulfonium ion from the reaction of dimethyl sulfoxide (DMSO) and 1,2-dibromoethane (DBE) was achieved. The beta-ketoenamines underwent N-annulation to pyridine derivatives, while the N-alkylated enamines were benzannulated to afford substituted anilines. The utility of the intermediate methyl(methylene)sulfonium ion was further extended for synthesizing methylene-bridged bis-1,3-dicarbonyl compounds.
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