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- Title
Highly efficient synthesis of dicoumarols and xanthene derivatives in presence of Brønsted-Lewis acidic ionic liquids catalyst.
- Authors
Abbasi, Faezeh; Azizi, Najmedin; Abdoli-Senejani, Masumeh
- Abstract
A series of metal chloride-based acidic ionic liquids have been prepared and used as an efficient catalyst in one-pot multicomponent synthesis of biscoumarins and substituted xanthenes derivatives under solvent-free conditions. Among the acidic ionic liquids, N-methylpyrrolidonium zinc chloride (Hnmp/ZnCl)-based Brønsted-Lewis acidic ionic liquids were found to be an effective and recyclable catalyst for a one-pot synthesis of biscoumarins through the domino Knoevenagel-Michael reaction of a variety of aldehydes with 4-hydroxycoumarin in short reaction times. The reactions which occur under relatively mild conditions afforded the biscoumarin derivatives employing a very low loading of catalyst in satisfactory isolated yields and high purity after simple work-up. The Brønsted-Lewis acidic ionic liquid catalyst was reused four times without any variation in yield.
- Subjects
IONIC liquids; CATALYSTS; CHEMICAL synthesis; XANTHENE; COUMARINS
- Publication
Journal of the Iranian Chemical Society, 2017, Vol 14, Issue 10, p2097
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-017-1146-5