What the study found
The study reports a new way to make 2-quinolones, a class of nitrogen-containing ring compounds, from (E)-2-aminocinnamic acid derivatives using a thiolate as a nucleophilic promoter. The authors also report that the method works for all regioisomers of 2-aza-quinolones from 2-amino-aza-cinnamate derivatives.
Why the authors say this matters
The authors say the simple operation, easy isolation of quinolones by recrystallization, and gram-scale scalability highlight the practical utility of the protocol. The study suggests the method may be useful as a practical synthesis route for quinolone and aza-quinolone derivatives.
What the researchers tested
The researchers tested a cyclization protocol in which a thiolate first adds to (E)-2-aminocinnamic acid derivatives, forming β-sulfide-substituted dihydrocinnamic acid intermediates. They then examined whether these intermediates could undergo intramolecular condensation between amino and carboxyl groups, followed by elimination of hydrogen sulfide, to form the target ring system.
What worked and what didn't
A broad range of 2-aminocinnamic acid derivatives was compatible with the transformation, and the corresponding 2-quinolone derivatives were obtained in excellent yields. The abstract does not describe substrate classes that failed or specific cases that performed poorly.
What to keep in mind
The available summary does not provide detailed reaction conditions, specific yield values, or a list of incompatible substrates. It also does not describe experimental limitations beyond the stated scope of the reported derivatives and the mention of gram-scale scalability.
Key points
- A thiolate-mediated protocol was developed for making 2-quinolones from (E)-2-aminocinnamic acid derivatives.
- The proposed sequence involves thiolate addition, intramolecular condensation, and hydrogen sulfide elimination.
- The method also applies to 2-amino-aza-cinnamate derivatives, giving all regioisomers of 2-aza-quinolones.
- The abstract reports broad substrate compatibility and excellent yields.
- The authors note simple operation, recrystallization-based isolation, and gram-scale scalability.
Disclosure
- Research title:
- Thiolate-mediated cyclization yields 2-quinolones from 2-aminocinnamic acids
- Authors:
- Tae Won Kim, Nuo Ming Goh, Cheol‐Hong Cheon
- Institutions:
- Korea University, Korea University, Korea University, Korea University, Korea University, Korea University
- Publication date:
- 2026-02-23
- OpenAlex record:
- View
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