Study of multicomponent synthesis of 7-alkyl or aryl-6H,7H-benzo[f]chromeno[4,3-b] chromen-6-ones involving N,N-disulfopiperidiniumbisulfate [DSPP][HSO4] as efficient recyclable homogeneous Brönsted acidic catalyst.

Autor: Baruah, Kabita, Kalita, Sangeeta, Kashyap, Niharika, Bora, Debanga Bhusan, Paul, Subham, Borah, Ruli
Zdroj: Molecular Diversity; Feb2024, Vol. 28 Issue 1, p159-169, 11p
Abstrakt: Herein, a new type of pyranocoumarin derivatives 7-alkyl or aryl-6H,7H-benzo[f]chromeno[4,3-b] chromen-6-ones (2a–h) was developed via three component reaction of 4-hydroxy coumarin, β-naphthol and aliphatic/aryl aldehydes using 25 mol% of N,N-disulfopiperidinium bisulfate [DSPP][HSO4] as homogeneous recyclable Brönsted acidic ionic liquid catalyst in EtOAc under reflux to produce excellent yields (89–97%) of the products within 2–4 h reaction. In neat condition, the same reaction required 4.5 h to produce 90% yield of model product (2d) at 100 ℃, which took only 2.5 h to yield 97% of the same product in EtOAc under reflux temperature. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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