Synthesis of pyrano[3,2- <i>c</i> ]chromene-2,5-diones from 4-hydroxycoumarins and aminocrotonates under solvent-free conditions
A new one-pot approach was developed for the construction of pyrano[3,2-<i>c</i>]chromene-2,5-diones by reacting 4-hydroxycoumarins with ethyl 3-oxo-3-phenylpropanoates in the presence of ammonium salts or aminocrotonates under solvent-free conditions. The title compounds were formed by intramolecular cyclization through new C-C and C-O bonds. Structure assignment of compound 3e was confirmed by single crystal X-ray analysis.
Authors
- A. Krishnaiah (ORCID: https://orcid.org/0000-0002-0076-513X)
- B. China Raju (ORCID: https://orcid.org/0000-0001-6905-809X)
- Balasubramanian Sridhar (ORCID: https://orcid.org/0000-0002-9682-8376)
- Shahnaz Begum
- Sravani Kashameni
Institutions
- Indian Institute of Chemical Technology (IN)
- Academy of Scientific and Innovative Research (IN)
Publication Details
- Journal
- Organic & Biomolecular Chemistry
- Published
- 2024-12-19
- DOI
- https://doi.org/10.1039/d4ob01800a
- Primary Topic
- Multicomponent Synthesis of Heterocycles
- Type
- article
- Field-Weighted Citation Impact
- 0.00