Introduction to the novel ionic liquid-based catalytic system for the multicomponent preparation of benzo[f]pyrano[3,2-c]chromene and pyrano[3,2-c]chromene derivatives under ultrasonic irradiation condition
A straightforward and high-productivity procedure for preparing benzo[f]pyrano[3,2-c]chromene derivatives is reported. 7 compounds coded as 1a-7a were prepared by a three-component reaction between 1-hydroxy-3H-benzo[f]chromen-3-one, malononitrile, and 1-benzylindoline-2,3-dione in ethanol under ref...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Results in Chemistry |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715625002243 |
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| Summary: | A straightforward and high-productivity procedure for preparing benzo[f]pyrano[3,2-c]chromene derivatives is reported. 7 compounds coded as 1a-7a were prepared by a three-component reaction between 1-hydroxy-3H-benzo[f]chromen-3-one, malononitrile, and 1-benzylindoline-2,3-dione in ethanol under reflux condition and ultrasonic irradiation. Similarly, 10 compounds (1b-10b) of pyrano[3,2-c]chromene derivatives were prepared from the three-component reaction between 4-hydroxycoumarin, malononitrile, and aromatic aldehydes. Ionic liquid B2 was prepared for the first time and used as a catalyst. The nonchromatographic separation and purification of the products with high-yield productivity are the salient features of this protocol. |
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| ISSN: | 2211-7156 |